{
 "instance": {
  "ryi-10q_20200331.htm": {
   "axisCustom": 0,
   "axisStandard": 26,
   "contextCount": 216,
   "dts": {
    "calculationLink": {
     "local": [
      "ryi-20200331_cal.xml"
     ]
    },
    "definitionLink": {
     "local": [
      "ryi-20200331_def.xml"
     ],
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
      "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
     ]
    },
    "inline": {
     "local": [
      "ryi-10q_20200331.htm"
     ]
    },
    "labelLink": {
     "local": [
      "ryi-20200331_lab.xml"
     ],
     "remote": [
      "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml"
     ]
    },
    "presentationLink": {
     "local": [
      "ryi-20200331_pre.xml"
     ]
    },
    "referenceLink": {
     "remote": [
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml",
      "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml"
     ]
    },
    "schema": {
     "local": [
      "ryi-20200331.xsd"
     ],
     "remote": [
      "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
      "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
      "http://www.xbrl.org/2005/xbrldt-2005.xsd",
      "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
      "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
      "https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd",
      "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
      "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
      "https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
      "https://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd",
      "https://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd",
      "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd",
      "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
      "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
      "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd",
      "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
      "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd"
     ]
    }
   },
   "elementCount": 552,
   "entityCount": 1,
   "hidden": {
    "http://fasb.org/us-gaap/2019-01-31": 14,
    "http://www.ryerson.com/20200331": 2,
    "http://xbrl.sec.gov/dei/2019-01-31": 6,
    "total": 22
   },
   "keyCustom": 42,
   "keyStandard": 349,
   "memberCustom": 43,
   "memberStandard": 46,
   "nsprefix": "ryi",
   "nsuri": "http://www.ryerson.com/20200331",
   "report": {
    "R1": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "document",
     "isDefault": "true",
     "longName": "100000 - Document - Document and Entity Information",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation",
     "shortName": "Document and Entity Information",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "dei:DocumentType",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R10": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100090 - Disclosure - Leases",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeases",
     "shortName": "Leases",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R11": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100100 - Disclosure - Goodwill and Other Intangible Assets",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets",
     "shortName": "Goodwill and Other Intangible Assets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R12": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100110 - Disclosure - Long-Term Debt",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt",
     "shortName": "Long-Term Debt",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DebtDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R13": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100120 - Disclosure - Employee Benefits",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefits",
     "shortName": "Employee Benefits",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R14": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100130 - Disclosure - Commitments and Contingencies",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingencies",
     "shortName": "Commitments and Contingencies",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R15": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FinancialInstrumentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100140 - Disclosure - Derivatives and Fair Value Measurements",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurements",
     "shortName": "Derivatives and Fair Value Measurements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:FinancialInstrumentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R16": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100150 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterest",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R17": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100160 - Disclosure - Revenue Recognition",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognition",
     "shortName": "Revenue Recognition",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueFromContractWithCustomerTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R18": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CreditLossFinancialInstrumentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100170 - Disclosure - Provision for Credit Losses",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLosses",
     "shortName": "Provision for Credit Losses",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CreditLossFinancialInstrumentTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R19": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100180 - Disclosure - Income Taxes",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxes",
     "shortName": "Income Taxes",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:IncomeTaxDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R2": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100010 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited",
     "shortName": "Condensed Consolidated Statements of Comprehensive Income (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:CostOfGoodsAndServicesSold",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R20": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100190 - Disclosure - Earnings Per Share",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShare",
     "shortName": "Earnings Per Share",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:EarningsPerShareTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R21": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100200 - Disclosure - Summary of Accounting and Financial Policies (Policies)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureSummaryOfAccountingAndFinancialPoliciesPolicies",
     "shortName": "Summary of Accounting and Financial Policies (Policies)",
     "subGroupType": "policies",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsPolicyPolicyTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R22": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100210 - Disclosure - Cash, Cash Equivalents, and Restricted Cash (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashTables",
     "shortName": "Cash, Cash Equivalents, and Restricted Cash (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R23": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100220 - Disclosure - Inventories (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesTables",
     "shortName": "Inventories (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:InventoryDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R24": {
     "firstAnchor": {
      "ancestors": [
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100230 - Disclosure - Leases (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables",
     "shortName": "Leases (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R25": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100240 - Disclosure - Long-Term Debt (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtTables",
     "shortName": "Long-Term Debt (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDebtTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R26": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100250 - Disclosure - Employee Benefits (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsTables",
     "shortName": "Employee Benefits (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R27": {
     "firstAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100260 - Disclosure - Derivatives and Fair Value Measurements (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables",
     "shortName": "Derivatives and Fair Value Measurements (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R28": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfStockholdersEquityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100270 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestTables",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfStockholdersEquityTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R29": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisaggregationOfRevenueTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100280 - Disclosure - Revenue Recognition (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionTables",
     "shortName": "Revenue Recognition (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DisaggregationOfRevenueTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R3": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProfitLoss",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100020 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited",
     "shortName": "Condensed Consolidated Statements of Cash Flows (Unaudited)",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:DepreciationAndAmortization",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R30": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:CreditLossFinancialInstrumentTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsReceivableAllowanceForCreditLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100290 - Disclosure - Provision for Credit Losses (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesTables",
     "shortName": "Provision for Credit Losses (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:CreditLossFinancialInstrumentTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:AccountsReceivableAllowanceForCreditLossTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R31": {
     "firstAnchor": {
      "ancestors": [
       "us-gaap:EarningsPerShareTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100300 - Disclosure - Earnings Per Share (Tables)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareTables",
     "shortName": "Earnings Per Share (Tables)",
     "subGroupType": "tables",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:EarningsPerShareTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R32": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:ParentCompanySharesOwnedByAffiliates",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlishares",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100310 - Disclosure - Financial Statements - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureFinancialStatementsAdditionalInformationDetail",
     "shortName": "Financial Statements - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:ParentCompanySharesOwnedByAffiliates",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlishares",
      "xsiNil": "false"
     }
    },
    "R33": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100320 - Disclosure - Cash, Cash Equivalents, and Restricted Cash - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail",
     "shortName": "Cash, Cash Equivalents, and Restricted Cash - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R34": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20190101_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "ryi:ProceedsFromSaleAndLeasebackTransaction",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100330 - Disclosure - Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail",
     "shortName": "Cash, Cash Equivalents, and Restricted Cash - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20190101_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "ryi:ProceedsFromSaleAndLeasebackTransaction",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R35": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryNet",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100340 - Disclosure - Inventories - Schedule of Inventories (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetail",
     "shortName": "Inventories - Schedule of Inventories (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": null
    },
    "R36": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryLIFOReserve",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100350 - Disclosure - Inventories - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesAdditionalInformationDetail",
     "shortName": "Inventories - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:InventoryLIFOReserve",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R37": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtRangeAxis_srtMaximumMember_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:OperatingLeaseExpirationPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100360 - Disclosure - Leases - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
     "shortName": "Leases - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtRangeAxis_srtMaximumMember_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "ryi:OperatingLeaseExpirationPeriod",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R38": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseRightOfUseAsset",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100370 - Disclosure - Leases - Summary of Location and Amount of Lease Assets and Lease Liabilities (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail",
     "shortName": "Leases - Summary of Location and Amount of Lease Assets and Lease Liabilities (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:FinanceLeaseRightOfUseAsset",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R39": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100380 - Disclosure - Leases - Summary of Location and Amount of Lease Assets and Lease Liabilities (Parenthetical) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail",
     "shortName": "Leases - Summary of Location and Amount of Lease Assets and Lease Liabilities (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapPropertyPlantAndEquipmentByTypeAxis_ryiAssetsHeldUnderFinanceLeasesMember_20200331",
      "decimals": "-5",
      "lang": "en-US",
      "name": "us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R4": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100030 - Statement - Condensed Consolidated Balance Sheets",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets",
     "shortName": "Condensed Consolidated Balance Sheets",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:ReceivablesNetCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R40": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:LeaseCostTableTextBlock",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:LeaseCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100390 - Disclosure - Leases - Summary of Location and Amount of Lease Expense (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail",
     "shortName": "Leases - Summary of Location and Amount of Lease Expense (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:LeaseCostTableTextBlock",
       "ryi:LesseeOperatingAndFinancingLeasesTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:LeaseCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R41": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100400 - Disclosure - Leases - Schedule of Maturity Analysis of Lease Liabilities (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail",
     "shortName": "Leases - Schedule of Maturity Analysis of Lease Liabilities (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R42": {
     "firstAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "ryi:LesseeOperatingLeaseOptionToExtendLeaseTermsThatAreReasonablyCertainOfBeingExercised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100420 - Disclosure - Leases - Schedule of Maturity Analysis of Lease Liabilities (Parenthetical) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesParentheticalDetail",
     "shortName": "Leases - Schedule of Maturity Analysis of Lease Liabilities (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "INF",
      "first": true,
      "lang": "en-US",
      "name": "ryi:LesseeOperatingLeaseOptionToExtendLeaseTermsThatAreReasonablyCertainOfBeingExercised",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R43": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100430 - Disclosure - Leases - Schedule of Weighted-Average Remaining Lease Term and Discount Rate for Operating and Finance Leases (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail",
     "shortName": "Leases - Schedule of Weighted-Average Remaining Lease Term and Discount Rate for Operating and Finance Leases (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "3",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     }
    },
    "R44": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfInformationReportedInConsolidatedStatementsOfCashFlowsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasePayments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100440 - Disclosure - Leases - Schedule of Information Reported in Condensed Consolidated Statement of Cash Flows (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
     "shortName": "Leases - Schedule of Information Reported in Condensed Consolidated Statement of Cash Flows (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:SummaryOfInformationReportedInConsolidatedStatementsOfCashFlowsTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:OperatingLeasePayments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R45": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:Goodwill",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100450 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetail",
     "shortName": "Goodwill and Other Intangible Assets - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "lang": null,
      "name": "us-gaap:GoodwillImpairmentLoss",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R46": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "ryi:ForeignDebtShortTermAmount",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100460 - Disclosure - Long-Term Debt - Long-Term Debt (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
     "shortName": "Long-Term Debt - Long-Term Debt (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:OtherBorrowings",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R47": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_20200301_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProceedsFromLinesOfCredit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100480 - Disclosure - Long-Term Debt - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
     "shortName": "Long-Term Debt - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_20200301_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:ProceedsFromLinesOfCredit",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R48": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100490 - Disclosure - Long-Term Debt - Ryerson Credit Facility - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail",
     "shortName": "Long-Term Debt - Ryerson Credit Facility - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_20200101_20200331",
      "decimals": null,
      "lang": "en-US",
      "name": "us-gaap:LineOfCreditFacilityExpirationDate1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R49": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:GainsLossesOnExtinguishmentOfDebt",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100500 - Disclosure - Long-Term Debt - 2022 Notes - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
     "shortName": "Long-Term Debt - 2022 Notes - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDebtInstrumentAxis_ryiTwoThousandTwentyTwoSeniorNotesMember_20160524",
      "decimals": "INF",
      "lang": null,
      "name": "us-gaap:DebtInstrumentInterestRateStatedPercentage",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     }
    },
    "R5": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "statement",
     "isDefault": "false",
     "longName": "100040 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical",
     "shortName": "Condensed Consolidated Balance Sheets (Parenthetical)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R50": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDebtTableTextBlock",
       "us-gaap:DebtDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "ryi:ForeignDebtShortTermAmount",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100510 - Disclosure - Long-Term Debt - Foreign Debt - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
     "shortName": "Long-Term Debt - Foreign Debt - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapCreditFacilityAxis_ryiForeignDebtMember_20200331",
      "decimals": "-6",
      "lang": null,
      "name": "us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R51": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapRetirementPlanTypeAxis_us-gaapPensionPlansDefinedBenefitMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DefinedBenefitPlanServiceCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100520 - Disclosure - Employee Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail",
     "shortName": "Employee Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapRetirementPlanTypeAxis_us-gaapPensionPlansDefinedBenefitMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DefinedBenefitPlanServiceCost",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R52": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "p",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:PensionContributions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100530 - Disclosure - Employee Benefits - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsAdditionalInformationDetail",
     "shortName": "Employee Benefits - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "p",
       "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-6",
      "first": true,
      "lang": null,
      "name": "us-gaap:PensionContributions",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R53": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LossContingencyDamagesSought",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100540 - Disclosure - Commitments and Contingencies - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail",
     "shortName": "Commitments and Contingencies - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:LossContingencyDamagesSought",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R54": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:FinancialInstrumentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestRateCashFlowHedgeDerivativeAtFairValueNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100550 - Disclosure - Derivatives and Fair Value Measurements - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
     "shortName": "Derivatives and Fair Value Measurements - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:FinancialInstrumentsDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:InterestRateCashFlowHedgeDerivativeAtFairValueNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R55": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeAssets",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100560 - Disclosure - Derivatives and Fair Value Measurements - Location and Fair Value Amount of Derivative Instruments (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
     "shortName": "Derivatives and Fair Value Measurements - Location and Fair Value Amount of Derivative Instruments (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapBalanceSheetLocationAxis_us-gaapPrepaidExpensesAndOtherCurrentAssetsMember_us-gaapDerivativeInstrumentRiskAxis_ryiMetalCommodityContractsMember_us-gaapHedgingDesignationAxis_us-gaapNondesignatedMember_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:DerivativeAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R56": {
     "firstAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_ryiDerivativeLiabilityNetOfCashCollateralMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100570 - Disclosure - Derivatives and Fair Value Measurements - Location and Fair Value Amount of Derivative Instruments (Parenthetical) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail",
     "shortName": "Derivatives and Fair Value Measurements - Location and Fair Value Amount of Derivative Instruments (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_ryiDerivativeLiabilityNetOfCashCollateralMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R57": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfDerivativeInstrumentsVolumeOfActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_ryiIronOreSwapContractsMember_20200101_20200331",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeNonmonetaryNotionalAmountMass",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_utrT",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100580 - Disclosure - Derivatives and Fair Value Measurements - Volume of Company 's Activity in Derivative Instruments (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail",
     "shortName": "Derivatives and Fair Value Measurements - Volume of Company 's Activity in Derivative Instruments (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ryi:ScheduleOfDerivativeInstrumentsVolumeOfActivityTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_ryiIronOreSwapContractsMember_20200101_20200331",
      "decimals": "0",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeNonmonetaryNotionalAmountMass",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_utrT",
      "xsiNil": "false"
     }
    },
    "R58": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeGainLossOnDerivativeNet",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100590 - Disclosure - Derivatives and Fair Value Measurements - Location and Amount of Gains and Losses on Derivatives Not Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
     "shortName": "Derivatives and Fair Value Measurements - Location and Amount of Gains and Losses on Derivatives Not Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapHedgingDesignationAxis_us-gaapNondesignatedMember_20200101_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:DerivativeGainLossOnDerivativeNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R59": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCashFlowHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_us-gaapInterestRateSwapMember_us-gaapHedgingDesignationAxis_us-gaapDesignatedAsHedgingInstrumentMember_us-gaapIncomeStatementLocationAxis_ryiInterestAndOtherExpenseOnDebtMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100600 - Disclosure - Derivatives and Fair Value Measurements - Location and Amount of Gains and Losses on Derivatives Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
     "shortName": "Derivatives and Fair Value Measurements - Location and Amount of Gains and Losses on Derivatives Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfCashFlowHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapDerivativeInstrumentRiskAxis_us-gaapInterestRateSwapMember_us-gaapHedgingDesignationAxis_us-gaapDesignatedAsHedgingInstrumentMember_us-gaapIncomeStatementLocationAxis_ryiInterestAndOtherExpenseOnDebtMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R6": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100050 - Disclosure - Financial Statements",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureFinancialStatements",
     "shortName": "Financial Statements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R60": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:DerivativeAssets",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100610 - Disclosure - Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
     "shortName": "Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:DerivativeAssets",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R61": {
     "firstAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtCounterpartyNameAxis_ryiDerivativeCounterpartyMember_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100620 - Disclosure - Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value (Parenthetical) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
     "shortName": "Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "link:footnote",
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtCounterpartyNameAxis_ryiDerivativeCounterpartyMember_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsRecurringMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:DerivativeLiabilities",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R62": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapFairValueByMeasurementBasisAxis_us-gaapCarryingReportedAmountFairValueDisclosureMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100630 - Disclosure - Derivatives and Fair Value Measurements - Carrying and Estimated Fair Values Financial Instruments (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail",
     "shortName": "Derivatives and Fair Value Measurements - Carrying and Estimated Fair Values Financial Instruments (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueByBalanceSheetGroupingTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapFairValueByMeasurementBasisAxis_us-gaapCarryingReportedAmountFairValueDisclosureMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:CashAndCashEquivalentsFairValueDisclosure",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R63": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsNonrecurringMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100640 - Disclosure - Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on Non Recurring Basis (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
     "shortName": "Derivatives and Fair Value Measurements - Assets and Liabilities Measured and Recorded at Fair Value on Non Recurring Basis (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:FairValueAssetsMeasuredOnNonrecurringBasisTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_us-gaapFairValueByMeasurementFrequencyAxis_us-gaapFairValueMeasurementsNonrecurringMember_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R64": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100650 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20181231",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R65": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfStockholdersEquityTableTextBlock",
       "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100660 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Parenthetical) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Parenthetical) (Detail)",
     "subGroupType": "parenthetical",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfStockholdersEquityTableTextBlock",
       "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R66": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100670 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Changes in Accumulated Other Comprehensive Income/(Loss) Net of Tax by Component (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Changes in Accumulated Other Comprehensive Income/(Loss) Net of Tax by Component (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapStatementEquityComponentsAxis_us-gaapAccumulatedTranslationAdjustmentMember_20191231",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R67": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapStatementEquityComponentsAxis_us-gaapAccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100680 - Disclosure - Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail",
     "shortName": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_us-gaapStatementEquityComponentsAxis_us-gaapAccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R68": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_ryiSegment",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100690 - Disclosure - Revenue Recognition - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail",
     "shortName": "Revenue Recognition - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "us-gaap:NumberOfOperatingSegments",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_ryiSegment",
      "xsiNil": "false"
     }
    },
    "R69": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:PercentageOfSalesByMajorProductLines",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100700 - Disclosure - Revenue Recognition - Percentage of Sales by Major Product Lines (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail",
     "shortName": "Revenue Recognition - Percentage of Sales by Major Product Lines (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:DisaggregationOfRevenueTableTextBlock",
       "us-gaap:RevenueFromContractWithCustomerTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:PercentageOfSalesByMajorProductLines",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     }
    },
    "R7": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100060 - Disclosure - Recent Accounting Pronouncements",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRecentAccountingPronouncements",
     "shortName": "Recent Accounting Pronouncements",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R70": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100710 - Disclosure - Revenue Recognition - Summary of Consolidated Financial Information of our Operations by Geographic Location (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail",
     "shortName": "Revenue Recognition - Summary of Consolidated Financial Information of our Operations by Geographic Location (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtStatementGeographicalAxis_countryUS_20200101_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R71": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:TimingOfRevenueRecognitionPercentageOfProducts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100720 - Disclosure - Revenue Recognition - Summary of Revenues by Type of Item Sold (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail",
     "shortName": "Revenue Recognition - Summary of Revenues by Type of Item Sold (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "INF",
      "first": true,
      "lang": null,
      "name": "ryi:TimingOfRevenueRecognitionPercentageOfProducts",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlipure",
      "xsiNil": "false"
     }
    },
    "R72": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ContractWithCustomerAssetNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100730 - Disclosure - Revenue Recognition - Summary of Significant Changes in Contract Assets and Contract Liabilities Balances (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail",
     "shortName": "Revenue Recognition - Summary of Significant Changes in Contract Assets and Contract Liabilities Balances (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "ix:continuation",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:ContractWithCustomerAssetNet",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R73": {
     "firstAnchor": {
      "ancestors": [
       "span",
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtRangeAxis_srtMaximumMember_us-gaapRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_2020-04-01_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100740 - Disclosure - Revenue Recognition - Additional Information 1 (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
     "shortName": "Revenue Recognition - Additional Information 1 (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "span",
       "p",
       "ix:continuation",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_srtRangeAxis_srtMaximumMember_us-gaapRevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_2020-04-01_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R74": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AccountsReceivableAllowanceForCreditLossTableTextBlock",
       "us-gaap:CreditLossFinancialInstrumentTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivable",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100750 - Disclosure - Provision for Credit Losses - Schedule of Reconciliation of Provision for Credit Losses (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesScheduleOfReconciliationOfProvisionForCreditLossesDetail",
     "shortName": "Provision for Credit Losses - Schedule of Reconciliation of Provision for Credit Losses (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:AccountsReceivableAllowanceForCreditLossTableTextBlock",
       "us-gaap:CreditLossFinancialInstrumentTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20191231",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:AllowanceForDoubtfulAccountsReceivable",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R75": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:IncomeTaxExpenseBenefit",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100760 - Disclosure - Income Taxes - Additional Information (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail",
     "shortName": "Income Taxes - Additional Information (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "us-gaap:DeferredTaxAssetsValuationAllowance",
       "span",
       "p",
       "us-gaap:IncomeTaxDisclosureTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200331",
      "decimals": "-5",
      "lang": null,
      "name": "us-gaap:DeferredTaxAssetsValuationAllowance",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     }
    },
    "R76": {
     "firstAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "-5",
      "first": true,
      "lang": null,
      "name": "us-gaap:NetIncomeLoss",
      "reportCount": 1,
      "unitRef": "U_iso4217USD",
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100770 - Disclosure - Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail)",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail",
     "shortName": "Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail)",
     "subGroupType": "details",
     "uniqueAnchor": {
      "ancestors": [
       "p",
       "td",
       "tr",
       "table",
       "div",
       "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
       "us-gaap:EarningsPerShareTextBlock",
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": "0",
      "lang": null,
      "name": "us-gaap:WeightedAverageNumberOfSharesOutstandingBasic",
      "reportCount": 1,
      "unique": true,
      "unitRef": "U_xbrlishares",
      "xsiNil": "false"
     }
    },
    "R8": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100070 - Disclosure - Cash, Cash Equivalents, and Restricted Cash",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCash",
     "shortName": "Cash, Cash Equivalents, and Restricted Cash",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:CashAndCashEquivalentsDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    },
    "R9": {
     "firstAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     },
     "groupType": "disclosure",
     "isDefault": "false",
     "longName": "100080 - Disclosure - Inventories",
     "role": "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventories",
     "shortName": "Inventories",
     "subGroupType": "",
     "uniqueAnchor": {
      "ancestors": [
       "body",
       "html"
      ],
      "baseRef": "ryi-10q_20200331.htm",
      "contextRef": "C_0001481582_20200101_20200331",
      "decimals": null,
      "first": true,
      "lang": "en-US",
      "name": "us-gaap:InventoryDisclosureTextBlock",
      "reportCount": 1,
      "unique": true,
      "unitRef": null,
      "xsiNil": "false"
     }
    }
   },
   "segmentCount": 89,
   "tag": {
    "country_US": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "UNITED STATES",
        "terseLabel": "United States [Member]"
       }
      }
     },
     "localname": "US",
     "nsuri": "http://xbrl.sec.gov/country/2017-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_AmendmentFlag": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
        "label": "Amendment Flag",
        "terseLabel": "Amendment Flag"
       }
      }
     },
     "localname": "AmendmentFlag",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_CityAreaCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Area code of city",
        "label": "City Area Code",
        "terseLabel": "City Area Code"
       }
      }
     },
     "localname": "CityAreaCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_CoverAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cover page.",
        "label": "Cover [Abstract]"
       }
      }
     },
     "localname": "CoverAbstract",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "dei_CurrentFiscalYearEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "End date of current fiscal year in the format --MM-DD.",
        "label": "Current Fiscal Year End Date",
        "verboseLabel": "Current Fiscal Year End Date"
       }
      }
     },
     "localname": "CurrentFiscalYearEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "gMonthDayItemType"
    },
    "dei_DocumentFiscalPeriodFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
        "label": "Document Fiscal Period Focus",
        "terseLabel": "Document Fiscal Period Focus"
       }
      }
     },
     "localname": "DocumentFiscalPeriodFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "fiscalPeriodItemType"
    },
    "dei_DocumentFiscalYearFocus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.",
        "label": "Document Fiscal Year Focus",
        "terseLabel": "Document Fiscal Year Focus"
       }
      }
     },
     "localname": "DocumentFiscalYearFocus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "gYearItemType"
    },
    "dei_DocumentPeriodEndDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.",
        "label": "Document Period End Date",
        "terseLabel": "Document Period End Date"
       }
      }
     },
     "localname": "DocumentPeriodEndDate",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "dateItemType"
    },
    "dei_DocumentQuarterlyReport": {
     "auth_ref": [
      "r387"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as an quarterly report.",
        "label": "Document Quarterly Report",
        "terseLabel": "Document Quarterly Report"
       }
      }
     },
     "localname": "DocumentQuarterlyReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentTransitionReport": {
     "auth_ref": [
      "r388"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true only for a form used as a transition report.",
        "label": "Document Transition Report",
        "terseLabel": "Document Transition Report"
       }
      }
     },
     "localname": "DocumentTransitionReport",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_DocumentType": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
        "label": "Document Type",
        "terseLabel": "Document Type"
       }
      }
     },
     "localname": "DocumentType",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "submissionTypeItemType"
    },
    "dei_EntityAddressAddressLine1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 1 such as Attn, Building Name, Street Name",
        "label": "Entity Address Address Line1",
        "terseLabel": "Entity Address, Address Line One"
       }
      }
     },
     "localname": "EntityAddressAddressLine1",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressAddressLine2": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Address Line 2 such as Street or Suite number",
        "label": "Entity Address Address Line2",
        "terseLabel": "Entity Address, Address Line Two"
       }
      }
     },
     "localname": "EntityAddressAddressLine2",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressCityOrTown": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the City or Town",
        "label": "Entity Address City Or Town",
        "terseLabel": "Entity Address, City or Town"
       }
      }
     },
     "localname": "EntityAddressCityOrTown",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressPostalZipCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Code for the postal or zip code",
        "label": "Entity Address Postal Zip Code",
        "terseLabel": "Entity Address, Postal Zip Code"
       }
      }
     },
     "localname": "EntityAddressPostalZipCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityAddressStateOrProvince": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the state or province.",
        "label": "Entity Address State Or Province",
        "terseLabel": "Entity Address, State or Province"
       }
      }
     },
     "localname": "EntityAddressStateOrProvince",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "stateOrProvinceItemType"
    },
    "dei_EntityCentralIndexKey": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.",
        "label": "Entity Central Index Key",
        "terseLabel": "Entity Central Index Key"
       }
      }
     },
     "localname": "EntityCentralIndexKey",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "centralIndexKeyItemType"
    },
    "dei_EntityCommonStockSharesOutstanding": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
        "label": "Entity Common Stock Shares Outstanding",
        "verboseLabel": "Entity Common Stock, Shares Outstanding"
       }
      }
     },
     "localname": "EntityCommonStockSharesOutstanding",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "sharesItemType"
    },
    "dei_EntityCurrentReportingStatus": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Current Reporting Status",
        "terseLabel": "Entity Current Reporting Status"
       }
      }
     },
     "localname": "EntityCurrentReportingStatus",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains.",
        "label": "Entity [Domain]",
        "terseLabel": "Entity"
       }
      }
     },
     "localname": "EntityDomain",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "dei_EntityEmergingGrowthCompany": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate if registrant meets the emerging growth company criteria.",
        "label": "Entity Emerging Growth Company",
        "terseLabel": "Entity Emerging Growth Company"
       }
      }
     },
     "localname": "EntityEmergingGrowthCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityFileNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
        "label": "Entity File Number",
        "terseLabel": "Entity File Number"
       }
      }
     },
     "localname": "EntityFileNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "fileNumberItemType"
    },
    "dei_EntityFilerCategory": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.",
        "label": "Entity Filer Category",
        "terseLabel": "Entity Filer Category"
       }
      }
     },
     "localname": "EntityFilerCategory",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "filerCategoryItemType"
    },
    "dei_EntityIncorporationStateCountryCode": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two-character EDGAR code representing the state or country of incorporation.",
        "label": "Entity Incorporation State Country Code",
        "terseLabel": "Entity Incorporation, State or Country Code"
       }
      }
     },
     "localname": "EntityIncorporationStateCountryCode",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "edgarStateCountryItemType"
    },
    "dei_EntityInteractiveDataCurrent": {
     "auth_ref": [
      "r390"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
        "label": "Entity Interactive Data Current",
        "terseLabel": "Entity Interactive Data Current"
       }
      }
     },
     "localname": "EntityInteractiveDataCurrent",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "yesNoItemType"
    },
    "dei_EntityRegistrantName": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
        "label": "Entity Registrant Name",
        "terseLabel": "Entity Registrant Name"
       }
      }
     },
     "localname": "EntityRegistrantName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_EntityShellCompany": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
        "label": "Entity Shell Company",
        "terseLabel": "Entity Shell Company"
       }
      }
     },
     "localname": "EntityShellCompany",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntitySmallBusiness": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates that the company is a Smaller Reporting Company (SRC).",
        "label": "Entity Small Business",
        "terseLabel": "Entity Small Business"
       }
      }
     },
     "localname": "EntitySmallBusiness",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "booleanItemType"
    },
    "dei_EntityTaxIdentificationNumber": {
     "auth_ref": [
      "r389"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
        "label": "Entity Tax Identification Number",
        "terseLabel": "Entity Tax Identification Number"
       }
      }
     },
     "localname": "EntityTaxIdentificationNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "employerIdItemType"
    },
    "dei_LegalEntityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The set of legal entities associated with a report.",
        "label": "Legal Entity [Axis]",
        "terseLabel": "Legal Entity"
       }
      }
     },
     "localname": "LegalEntityAxis",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "dei_LocalPhoneNumber": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Local phone number for entity.",
        "label": "Local Phone Number",
        "terseLabel": "Local Phone Number"
       }
      }
     },
     "localname": "LocalPhoneNumber",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "normalizedStringItemType"
    },
    "dei_Security12bTitle": {
     "auth_ref": [
      "r385"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Title of a 12(b) registered security.",
        "label": "Security12b Title",
        "terseLabel": "Title of 12(b) Security"
       }
      }
     },
     "localname": "Security12bTitle",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "securityTitleItemType"
    },
    "dei_SecurityExchangeName": {
     "auth_ref": [
      "r386"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Name of the Exchange on which a security is registered.",
        "label": "Security Exchange Name",
        "terseLabel": "Security Exchange Name"
       }
      }
     },
     "localname": "SecurityExchangeName",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "edgarExchangeCodeItemType"
    },
    "dei_TradingSymbol": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Trading symbol of an instrument as listed on an exchange.",
        "label": "Trading Symbol",
        "terseLabel": "Trading Symbol"
       }
      }
     },
     "localname": "TradingSymbol",
     "nsuri": "http://xbrl.sec.gov/dei/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DocumentDocumentAndEntityInformation"
     ],
     "xbrltype": "tradingSymbolItemType"
    },
    "ryi_AccruedSalariesWagesAndCommissionsCurrent": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10190.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accrued salaries, wages and commissions current.",
        "label": "Accrued Salaries Wages And Commissions Current",
        "terseLabel": "Salaries, wages, and commissions"
       }
      }
     },
     "localname": "AccruedSalariesWagesAndCommissionsCurrent",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_AccumulatedDefinedBenefitPlansAdjustmentPensionSettlementExpenseOrAccrualMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated defined benefit plans adjustment pension settlement expense or accrual.",
        "label": "Accumulated Defined Benefit Plans Adjustment Pension Settlement Expense Or Accrual [Member]",
        "terseLabel": "Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Pension Settlement [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentPensionSettlementExpenseOrAccrualMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyExchangeRates": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Allowance for doubtful accounts receivable effects of foreign currency exchange rates.",
        "label": "Allowance For Doubtful Accounts Receivable Effects Of Foreign Currency Exchange Rates",
        "terseLabel": "Effect of foreign exchange rates"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivableEffectsOfForeignCurrencyExchangeRates",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesScheduleOfReconciliationOfProvisionForCreditLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_AluminumFlatMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aluminum flat.",
        "label": "Aluminum Flat [Member]",
        "terseLabel": "Aluminum Flat [Member]"
       }
      }
     },
     "localname": "AluminumFlatMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AluminumLongMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aluminum long.",
        "label": "Aluminum Long [Member]",
        "terseLabel": "Aluminum Long [Member]"
       }
      }
     },
     "localname": "AluminumLongMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AluminumPlateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aluminum plate.",
        "label": "Aluminum Plate [Member]",
        "terseLabel": "Aluminum Plate [Member]"
       }
      }
     },
     "localname": "AluminumPlateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AluminumSwapContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aluminum swap contracts.",
        "label": "Aluminum Swap Contracts [Member]",
        "terseLabel": "Aluminum Swap Contracts [Member]"
       }
      }
     },
     "localname": "AluminumSwapContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AmendedOldCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amended old credit facility.",
        "label": "Amended Old Credit Facility [Member]",
        "terseLabel": "Amended Old Credit Facility [Member]"
       }
      }
     },
     "localname": "AmendedOldCreditFacilityMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AssetAdditionsUnderAdoptionOfAccountingPrincipalNoncashInvestingActivities": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Asset additions under adoption of accounting principal noncash investing activities.",
        "label": "Asset Additions Under Adoption Of Accounting Principal Noncash Investing Activities",
        "terseLabel": "Asset additions under adoption of accounting principal ASC 842",
        "verboseLabel": "Adoption of accounting principal ASC 842"
       }
      }
     },
     "localname": "AssetAdditionsUnderAdoptionOfAccountingPrincipalNoncashInvestingActivities",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_AssetsHeldUnderFinanceLeasesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assets held under finance leases.",
        "label": "Assets Held Under Finance Leases [Member]",
        "terseLabel": "Finance Lease [Member]"
       }
      }
     },
     "localname": "AssetsHeldUnderFinanceLeasesMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_AssetsLesseeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assets lessee.",
        "label": "Assets Lessee [Abstract]",
        "terseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsLesseeAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_AssetsObtainedInExchangeForLeaseObligationsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Assets obtained in exchange for lease obligations.",
        "label": "Assets Obtained In Exchange For Lease Obligations [Abstract]",
        "terseLabel": "Assets obtained in exchange for lease obligations:"
       }
      }
     },
     "localname": "AssetsObtainedInExchangeForLeaseObligationsAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_BaseRateAndCanadianPrimeRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Base rate and Canadian prime rate.",
        "label": "Base Rate And Canadian Prime Rate [Member]",
        "terseLabel": "Base Rate and Canadian Prime Rate [Member]"
       }
      }
     },
     "localname": "BaseRateAndCanadianPrimeRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CanadianSubsidiariesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Canadian subsidiaries.",
        "label": "Canadian Subsidiaries [Member]",
        "terseLabel": "Canadian Subsidiaries [Member]"
       }
      }
     },
     "localname": "CanadianSubsidiariesMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CarbonSteelFlatMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carbon steel flat.",
        "label": "Carbon Steel Flat [Member]",
        "terseLabel": "Carbon Steel Flat [Member]"
       }
      }
     },
     "localname": "CarbonSteelFlatMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CarbonSteelLongMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carbon steel long.",
        "label": "Carbon Steel Long [Member]",
        "terseLabel": "Carbon Steel Long [Member]"
       }
      }
     },
     "localname": "CarbonSteelLongMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CarbonSteelPlateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carbon steel plate.",
        "label": "Carbon Steel Plate [Member]",
        "terseLabel": "Carbon Steel Plate [Member]"
       }
      }
     },
     "localname": "CarbonSteelPlateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CashFlowOperatingAndFinancingActivitiesLesseeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Cash flow, operating and financing activities, Lessee.",
        "label": "Cash Flow Operating And Financing Activities Lessee [Abstract]",
        "terseLabel": "Cash paid for amounts included in the measurement of lease liabilities"
       }
      }
     },
     "localname": "CashFlowOperatingAndFinancingActivitiesLesseeAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_ConsolidatedInterestRateSwapsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Consolidated interest rate swaps.",
        "label": "Consolidated Interest Rate Swaps [Member]",
        "terseLabel": "All Interest Rate Swap [Member]"
       }
      }
     },
     "localname": "ConsolidatedInterestRateSwapsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ContractWithCustomerAssetsChangesToReserves": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract asset changes to reserves.",
        "label": "Contract With Customer Assets Changes To Reserves",
        "terseLabel": "Changes to reserves"
       }
      }
     },
     "localname": "ContractWithCustomerAssetsChangesToReserves",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_ContractWithCustomerLiabilityChangesToReserves": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract liability changes to reserves.",
        "label": "Contract With Customer Liability Changes To Reserves",
        "terseLabel": "Changes to reserves"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityChangesToReserves",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_ContractWithCustomerLiabilityIncurred": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract with customer liability incurred.",
        "label": "Contract With Customer Liability Incurred",
        "terseLabel": "Contract liability incurred during the period"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityIncurred",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_CrudeOilCommodityContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Crude oil commodity contracts.",
        "label": "Crude Oil Commodity Contracts [Member]",
        "terseLabel": "Crude oil commodity contracts [Member]"
       }
      }
     },
     "localname": "CrudeOilCommodityContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_CrudeOilSwapContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Crude oil swap contracts.",
        "label": "Crude Oil Swap Contracts [Member]",
        "terseLabel": "Crude Oil Swap Contracts [Member]"
       }
      }
     },
     "localname": "CrudeOilSwapContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_DefinedBenefitPlanPensionForSettlementExpenseOrAccrual": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10040.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Defined benefit plan pension for settlement expense or accrual.",
        "label": "Defined Benefit Plan Pension For Settlement Expense Or Accrual",
        "negatedLabel": "Settlement expense"
       }
      }
     },
     "localname": "DefinedBenefitPlanPensionForSettlementExpenseOrAccrual",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_DerivativeCounterpartyMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative counterparty.",
        "label": "Derivative Counterparty [Member]",
        "terseLabel": "Derivative Counterparty [Member]"
       }
      }
     },
     "localname": "DerivativeCounterpartyMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_DerivativeInceptionPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative inception period.",
        "label": "Derivative Inception Period",
        "terseLabel": "Interest rate swap agreement date"
       }
      }
     },
     "localname": "DerivativeInceptionPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "gYearMonthItemType"
    },
    "ryi_DerivativeLiabilityNetOfCashCollateralMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative liability net of cash collateral.",
        "label": "Derivative Liability Net Of Cash Collateral [Member]",
        "terseLabel": "Derivative Liability Net of Cash Collateral [Member]"
       }
      }
     },
     "localname": "DerivativeLiabilityNetOfCashCollateralMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_DerivativeMaturityPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative maturity period.",
        "label": "Derivative Maturity Period",
        "terseLabel": "Derivative maturity period"
       }
      }
     },
     "localname": "DerivativeMaturityPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "gYearMonthItemType"
    },
    "ryi_DividendPaymentThresholdOfPercentageOfCumulativeNetIncome": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Dividend payment threshold of percentage of cumulative net income.",
        "label": "Dividend Payment Threshold Of Percentage Of Cumulative Net Income",
        "terseLabel": "Maximum percentage of dividend of cumulative net income"
       }
      }
     },
     "localname": "DividendPaymentThresholdOfPercentageOfCumulativeNetIncome",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_FederalFundsRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Federal funds rate.",
        "label": "Federal Funds Rate [Member]",
        "terseLabel": "Federal Funds Rate [Member]"
       }
      }
     },
     "localname": "FederalFundsRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_FinanceLeaseCostsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance lease costs.",
        "label": "Finance Lease Costs [Abstract]",
        "terseLabel": "Finance lease expense"
       }
      }
     },
     "localname": "FinanceLeaseCostsAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_FinanceLeaseExpirationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Finance lease expiration period.",
        "label": "Finance Lease Expiration Period",
        "terseLabel": "Finance leases expire period"
       }
      }
     },
     "localname": "FinanceLeaseExpirationPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail"
     ],
     "xbrltype": "gYearItemType"
    },
    "ryi_FirstInLastOutSubfacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "First-in last-out subfacility.",
        "label": "First In Last Out Subfacility [Member]",
        "terseLabel": "FILO Facility [Member]"
       }
      }
     },
     "localname": "FirstInLastOutSubfacilityMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ForeignDebtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Foreign debt.",
        "label": "Foreign Debt [Member]",
        "terseLabel": "Foreign Debt [Member]"
       }
      }
     },
     "localname": "ForeignDebtMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ForeignDebtShortTermAmount": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": 10030.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail2": {
       "order": 10020.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Foreign debt short term amount.",
        "label": "Foreign Debt Short Term Amount",
        "terseLabel": "Foreign debt"
       }
      }
     },
     "localname": "ForeignDebtShortTermAmount",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_GlobalIntangibleLowTaxedIncomeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Global intangible low-taxed income.",
        "label": "Global Intangible Low Taxed Income [Member]",
        "terseLabel": "GILTI [Member]"
       }
      }
     },
     "localname": "GlobalIntangibleLowTaxedIncomeMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_HotRollCoilSwapContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Hot roll coil swap contracts.",
        "label": "Hot Roll Coil Swap Contracts [Member]",
        "terseLabel": "Hot Roll Coil Swap Contracts [Member]"
       }
      }
     },
     "localname": "HotRollCoilSwapContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_IncomeTaxLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Income tax.",
        "label": "Income Tax [Line Items]",
        "terseLabel": "Income Tax [Line Items]"
       }
      }
     },
     "localname": "IncomeTaxLineItems",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_IncomeTaxTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Income tax.",
        "label": "Income Tax [Table]",
        "terseLabel": "Income Tax [Table]"
       }
      }
     },
     "localname": "IncomeTaxTable",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_InterestAndDebtExpenseMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and debt expense.",
        "label": "Interest And Debt Expense [Member]",
        "terseLabel": "Interest and Other Expense on Debt [Member]"
       }
      }
     },
     "localname": "InterestAndDebtExpenseMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_InterestAndOtherExpenseOnDebtMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and other expense on debt.",
        "label": "Interest And Other Expense On Debt [Member]",
        "terseLabel": "Interest and Other Expense on Debt [Member]"
       }
      }
     },
     "localname": "InterestAndOtherExpenseOnDebtMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_InterestRateOnOverdueAmountsAndDuringDefault": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate on overdue amounts and during default.",
        "label": "Interest Rate On Overdue Amounts And During Default",
        "terseLabel": "Default bear interest rate"
       }
      }
     },
     "localname": "InterestRateOnOverdueAmountsAndDuringDefault",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_IronOreSwapContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Iron ore swap contracts.",
        "label": "Iron Ore Swap Contracts [Member]",
        "terseLabel": "Iron Ore Swap Contracts [Member]"
       }
      }
     },
     "localname": "IronOreSwapContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_LesseeOperatingAndFinancingLeasesTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lessee, operating and financing leases.",
        "label": "Lessee Operating And Financing Leases [Text Block]",
        "terseLabel": "Leases"
       }
      }
     },
     "localname": "LesseeOperatingAndFinancingLeasesTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeases"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_LesseeOperatingLeaseLeaseNotYetCommencedLegallyBindingMinimumLeasePayments": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lessee, operating lease, lease not yet commenced, legally binding minimum lease payments.",
        "label": "Lessee Operating Lease Lease Not Yet Commenced Legally Binding Minimum Lease Payments",
        "terseLabel": "Legally binding minimum lease payments for leases signed but not yet commenced"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLeaseNotYetCommencedLegallyBindingMinimumLeasePayments",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_LesseeOperatingLeaseOptionToExtendLeaseTermsThatAreReasonablyCertainOfBeingExercised": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Lessee, operating lease option to extend lease terms that are reasonably certain of being exercised.",
        "label": "Lessee Operating Lease Option To Extend Lease Terms That Are Reasonably Certain Of Being Exercised",
        "terseLabel": "Operating leases with options to extend lease terms that are reasonably certain of being exercised"
       }
      }
     },
     "localname": "LesseeOperatingLeaseOptionToExtendLeaseTermsThatAreReasonablyCertainOfBeingExercised",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_LiabilitiesLesseeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Liabilities lessee.",
        "label": "Liabilities Lessee [Abstract]",
        "terseLabel": "Liabilities"
       }
      }
     },
     "localname": "LiabilitiesLesseeAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_LiborAndBankersAcceptanceRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "LIBOR and Banker's acceptance rate.",
        "label": "Libor And Bankers Acceptance Rate [Member]",
        "terseLabel": "LIBOR and Banker's Acceptance Rate [Member]"
       }
      }
     },
     "localname": "LiborAndBankersAcceptanceRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_LineOfCreditFacilityCommitmentFeePercentageIncreaseDecrease": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line of credit facility commitment fee percentage increase (decrease).",
        "label": "Line Of Credit Facility Commitment Fee Percentage Increase Decrease",
        "negatedLabel": "Reduction in commitment fees on amounts not borrowed"
       }
      }
     },
     "localname": "LineOfCreditFacilityCommitmentFeePercentageIncreaseDecrease",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_MetalCommodityContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Metal commodity contracts.",
        "label": "Metal Commodity Contracts [Member]",
        "terseLabel": "Metal Commodity Contracts [Member]"
       }
      }
     },
     "localname": "MetalCommodityContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_NetChangeInContractWithCustomerAssetsContractAssetsForProductsWithNoAlternativeUseDuringPeriod": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net change in contract assets for products with no alternative use during period.",
        "label": "Net Change In Contract With Customer Assets Contract Assets For Products With No Alternative Use During Period",
        "terseLabel": "Net change in contract assets for products with no alternative use during the period"
       }
      }
     },
     "localname": "NetChangeInContractWithCustomerAssetsContractAssetsForProductsWithNoAlternativeUseDuringPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_NetChangeInContractWithCustomerLiabilitiesContractLiabilitiesForProductsWithNoAlternativeUseDuringPeriod": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Net change in contract with customer liabilities contract liabilities for products with no alternative use during period.",
        "label": "Net Change In Contract With Customer Liabilities Contract Liabilities For Products With No Alternative Use During Period",
        "terseLabel": "Net change in contract liabilities for products with no alternative use during the period"
       }
      }
     },
     "localname": "NetChangeInContractWithCustomerLiabilitiesContractLiabilitiesForProductsWithNoAlternativeUseDuringPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnEquityTax": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "New accounting pronouncement or change in accounting principle effect of change on equity tax.",
        "label": "New Accounting Pronouncement Or Change In Accounting Principle Effect Of Change On Equity Tax",
        "terseLabel": "Changes due to adoption of ASC"
       }
      }
     },
     "localname": "NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnEquityTax",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_NickelSwapContractsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nickel swap contracts.",
        "label": "Nickel Swap Contracts [Member]",
        "terseLabel": "Nickel Swap Contracts [Member]"
       }
      }
     },
     "localname": "NickelSwapContractsMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_NoncashFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Noncash financing activities abstract.",
        "label": "Noncash Financing Activities [Abstract]",
        "terseLabel": "Noncash financing activities:"
       }
      }
     },
     "localname": "NoncashFinancingActivitiesAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_NoncashInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Noncash investing activities abstract.",
        "label": "Noncash Investing Activities [Abstract]",
        "terseLabel": "Noncash investing activities:"
       }
      }
     },
     "localname": "NoncashInvestingActivitiesAbstract",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_NumberOfAreasToPerformRemedialDesignWork": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of areas to perform remedial design work.",
        "label": "Number Of Areas To Perform Remedial Design Work",
        "terseLabel": "Number of areas to perform remedial design work"
       }
      }
     },
     "localname": "NumberOfAreasToPerformRemedialDesignWork",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "decimalItemType"
    },
    "ryi_OldRevolvingCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Old revolving credit facility.",
        "label": "Old Revolving Credit Facility [Member]",
        "terseLabel": "Old Revolving Credit Facility [Member]"
       }
      }
     },
     "localname": "OldRevolvingCreditFacilityMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_OneMonthCanadianBankersAcceptanceRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "One month Canadian bankers acceptance rate.",
        "label": "One Month Canadian Bankers Acceptance Rate [Member]",
        "terseLabel": "One Month Canadian Bankers Acceptance Rate [Member]"
       }
      }
     },
     "localname": "OneMonthCanadianBankersAcceptanceRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_OperatingAndFinanceLeaseLiabilities": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating and finance lease liabilities.",
        "label": "Operating And Finance Lease Liabilities",
        "totalLabel": "Total lease liabilities"
       }
      }
     },
     "localname": "OperatingAndFinanceLeaseLiabilities",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_OperatingAndFinanceLeaseRightOfUseAsset": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating and finance lease right of use asset.",
        "label": "Operating And Finance Lease Right Of Use Asset",
        "totalLabel": "Total lease assets"
       }
      }
     },
     "localname": "OperatingAndFinanceLeaseRightOfUseAsset",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_OperatingLeaseExpirationPeriod": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Operating lease expiration period.",
        "label": "Operating Lease Expiration Period",
        "terseLabel": "Noncancelable operating leases expire period"
       }
      }
     },
     "localname": "OperatingLeaseExpirationPeriod",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail"
     ],
     "xbrltype": "gYearItemType"
    },
    "ryi_OthersMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Others.",
        "label": "Others [Member]",
        "terseLabel": "Other [Member]"
       }
      }
     },
     "localname": "OthersMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_OwedToBanksMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Owed to banks.",
        "label": "Owed To Banks [Member]",
        "terseLabel": "Owed to Banks [Member]"
       }
      }
     },
     "localname": "OwedToBanksMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ParentCompanyPercentageOwnedByAffiliates": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Parent company percentage owned by affiliates.",
        "label": "Parent Company Percentage Owned By Affiliates",
        "terseLabel": "Parent company percentage owned by affiliates"
       }
      }
     },
     "localname": "ParentCompanyPercentageOwnedByAffiliates",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureFinancialStatementsAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_ParentCompanySharesOwnedByAffiliates": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Parent company shares owned by affiliates.",
        "label": "Parent Company Shares Owned By Affiliates",
        "terseLabel": "Parent company shares owned by affiliates"
       }
      }
     },
     "localname": "ParentCompanySharesOwnedByAffiliates",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureFinancialStatementsAdditionalInformationDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "ryi_PercentageOfAcreageOnRemediation": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of acreage on remediation.",
        "label": "Percentage Of Acreage On Remediation",
        "terseLabel": "Percentage of acreage on remediation"
       }
      }
     },
     "localname": "PercentageOfAcreageOnRemediation",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_PercentageOfMetalProductsSalesProcessed": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of metal products sales processed.",
        "label": "Percentage Of Metal Products Sales Processed",
        "terseLabel": "Percentage of revenue from product sales"
       }
      }
     },
     "localname": "PercentageOfMetalProductsSalesProcessed",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_PercentageOfSalesByMajorProductLines": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage of sales by major product lines.",
        "label": "Percentage Of Sales By Major Product Lines",
        "terseLabel": "Percentage of sales by major product lines"
       }
      }
     },
     "localname": "PercentageOfSalesByMajorProductLines",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_PrimeRateAndOneMonthLIBORRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Prime rate and one month LIBOR rate.",
        "label": "Prime Rate And One Month L I B O R Rate [Member]",
        "terseLabel": "Prime Rate and One Month LIBOR Rate [Member]"
       }
      }
     },
     "localname": "PrimeRateAndOneMonthLIBORRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ProceedsFromSaleAndLeasebackTransaction": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Proceeds from sale and leaseback transaction.",
        "label": "Proceeds From Sale And Leaseback Transaction",
        "terseLabel": "Net proceeds from sale leaseback transaction"
       }
      }
     },
     "localname": "ProceedsFromSaleAndLeasebackTransaction",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_ProvisionForAllowancesClaimsAndDoubtfulAccounts": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10180.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Provision for allowances, claims, and doubtful accounts.",
        "label": "Provision For Allowances Claims And Doubtful Accounts",
        "terseLabel": "Provision for allowances, claims, and doubtful accounts"
       }
      }
     },
     "localname": "ProvisionForAllowancesClaimsAndDoubtfulAccounts",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_RemediationPlanAllocationOfAmountDueDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Remediation plan allocation of amount due date.",
        "label": "Remediation Plan Allocation Of Amount Due Date",
        "terseLabel": "Remediation plan allocation of amount due date"
       }
      }
     },
     "localname": "RemediationPlanAllocationOfAmountDueDate",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "ryi_RemediationPlanDescription": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Remediation plan description.",
        "label": "Remediation Plan Description",
        "terseLabel": "Remediation plan description"
       }
      }
     },
     "localname": "RemediationPlanDescription",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "ryi_RemediationPlanDueDate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Remediation plan due date.",
        "label": "Remediation Plan Due Date",
        "terseLabel": "Remediation plan due date"
       }
      }
     },
     "localname": "RemediationPlanDueDate",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "ryi_RestrictedCashFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Restricted cash fair value disclosure.",
        "label": "Restricted Cash Fair Value Disclosure",
        "terseLabel": "Restricted cash"
       }
      }
     },
     "localname": "RestrictedCashFairValueDisclosure",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "ryi_RyersonChinaLimitedMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Ryerson China Limited.",
        "label": "Ryerson China Limited [Member]",
        "terseLabel": "Ryerson China [Member]"
       }
      }
     },
     "localname": "RyersonChinaLimitedMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ScheduleOfDerivativeInstrumentsVolumeOfActivityTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of derivative instrument volume of activity.",
        "label": "Schedule Of Derivative Instruments Volume Of Activity Table [Text Block]",
        "terseLabel": "Volume of Company 's Activity in Derivative Instruments"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsVolumeOfActivityTableTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule of maturity analysis of operating and finance lease liabilities.",
        "label": "Schedule Of Maturity Analysis Of Operating And Finance Lease Liabilities Table [Text Block]",
        "terseLabel": "Schedule of Maturity Analysis of Lease Liabilities"
       }
      }
     },
     "localname": "ScheduleOfMaturityAnalysisOfOperatingAndFinanceLeaseLiabilitiesTableTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_SecondInterestRateSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Second interest rate swap.",
        "label": "Second Interest Rate Swap [Member]",
        "terseLabel": "Second Interest Rate Swap [Member]",
        "verboseLabel": "Second Interest Rate Swaps [Member]"
       }
      }
     },
     "localname": "SecondInterestRateSwapMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_SeniorSecuredNotesDueIn2022Member": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Senior secured notes due in 2022.",
        "label": "Senior Secured Notes Due In2022 [Member]",
        "terseLabel": "Senior Secured Notes Due in 2022 [Member]"
       }
      }
     },
     "localname": "SeniorSecuredNotesDueIn2022Member",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_StainlessSteelFlatMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stainless steel flat.",
        "label": "Stainless Steel Flat [Member]",
        "terseLabel": "Stainless Steel Flat [Member]"
       }
      }
     },
     "localname": "StainlessSteelFlatMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_StainlessSteelLongMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stainless steel long.",
        "label": "Stainless Steel Long [Member]",
        "terseLabel": "Stainless Steel Long [Member]"
       }
      }
     },
     "localname": "StainlessSteelLongMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_StainlessSteelPlateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stainless steel plate.",
        "label": "Stainless Steel Plate [Member]",
        "terseLabel": "Stainless Steel Plate [Member]"
       }
      }
     },
     "localname": "StainlessSteelPlateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_SummaryOfInformationReportedInConsolidatedStatementsOfCashFlowsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summary of information reported in consolidated statements of cash flows.",
        "label": "Summary Of Information Reported In Consolidated Statements Of Cash Flows Table [Text Block]",
        "terseLabel": "Schedule of Information Reported in Condensed Consolidated Statement of Cash Flows"
       }
      }
     },
     "localname": "SummaryOfInformationReportedInConsolidatedStatementsOfCashFlowsTableTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summary of location and amount of lease assets and lease liabilities reported in condensed consolidated balance sheets.",
        "label": "Summary Of Location And Amount Of Lease Assets And Lease Liabilities Reported In Condensed Consolidated Balance Sheets Table [Text Block]",
        "terseLabel": "Summary of Location and Amount of Lease Assets and Lease Liabilities"
       }
      }
     },
     "localname": "SummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesReportedInCondensedConsolidatedBalanceSheetsTableTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_SummaryOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Summary of weighted-average remaining lease term and discount rate for operating and finance leases.",
        "label": "Summary Of Weighted Average Remaining Lease Term And Discount Rate For Operating And Finance Leases Table [Text Block]",
        "terseLabel": "Schedule of Weighted-Average Remaining Lease Term and Discount Rate for Operating and Finance Leases"
       }
      }
     },
     "localname": "SummaryOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesTableTextBlock",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "ryi_ThirdInterestRateSwapMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Third interest rate swap.",
        "label": "Third Interest Rate Swap [Member]",
        "terseLabel": "Third Interest Rate Swap [Member]"
       }
      }
     },
     "localname": "ThirdInterestRateSwapMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_ThirtyDaysLIBORRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Thirty days LIBOR rate.",
        "label": "Thirty Days L I B O R Rate [Member]",
        "terseLabel": "30 Day LIBOR Rate [Member]"
       }
      }
     },
     "localname": "ThirtyDaysLIBORRateMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_TimingOfRevenueRecognitionPercentageOfProducts": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Timing of revenue recognition percentage of products.",
        "label": "Timing Of Revenue Recognition Percentage Of Products",
        "totalLabel": "Total"
       }
      }
     },
     "localname": "TimingOfRevenueRecognitionPercentageOfProducts",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_TimingOfRevenueRecognitionPercentageOfProductsWithAlternativeUse": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail": {
       "order": 10010.0,
       "parentTag": "ryi_TimingOfRevenueRecognitionPercentageOfProducts",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Timing of revenue recognition percentage of products with an alternative use.",
        "label": "Timing Of Revenue Recognition Percentage Of Products With Alternative Use",
        "terseLabel": "Revenue on products with an alternative use"
       }
      }
     },
     "localname": "TimingOfRevenueRecognitionPercentageOfProductsWithAlternativeUse",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_TimingOfRevenueRecognitionPercentageOfProductsWithNoAlternativeUse": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail": {
       "order": 10020.0,
       "parentTag": "ryi_TimingOfRevenueRecognitionPercentageOfProducts",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Timing of revenue recognition percentage of products with no alternative use..",
        "label": "Timing Of Revenue Recognition Percentage Of Products With No Alternative Use",
        "terseLabel": "Revenue on products with no alternative use"
       }
      }
     },
     "localname": "TimingOfRevenueRecognitionPercentageOfProductsWithNoAlternativeUse",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "ryi_TwoThousandTwentyTwoSeniorNotesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Two thousand twenty two senior notes.",
        "label": "Two Thousand Twenty Two Senior Notes [Member]",
        "terseLabel": "2022 Notes [Member]"
       }
      }
     },
     "localname": "TwoThousandTwentyTwoSeniorNotesMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "ryi_USSubsidiariesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "US subsidiaries.",
        "label": "U S Subsidiaries [Member]",
        "terseLabel": "US Subsidiaries [Member]"
       }
      }
     },
     "localname": "USSubsidiariesMember",
     "nsuri": "http://www.ryerson.com/20200331",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Condensed Financial Information Of Parent Company Only Disclosure [Abstract]"
       }
      }
     },
     "localname": "CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "srt_ConsolidatedEntitiesAxis": {
     "auth_ref": [
      "r384"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidated Entities [Axis]",
        "terseLabel": "Consolidated Entities"
       }
      }
     },
     "localname": "ConsolidatedEntitiesAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ConsolidatedEntitiesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Consolidated Entities [Domain]",
        "terseLabel": "Consolidated Entities"
       }
      }
     },
     "localname": "ConsolidatedEntitiesDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_CounterpartyNameAxis": {
     "auth_ref": [
      "r65",
      "r118"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Counterparty Name [Axis]",
        "terseLabel": "Counterparty Name"
       }
      }
     },
     "localname": "CounterpartyNameAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_MaximumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Maximum [Member]",
        "terseLabel": "Maximum [Member]"
       }
      }
     },
     "localname": "MaximumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_MinimumMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Minimum [Member]",
        "terseLabel": "Minimum [Member]",
        "verboseLabel": "Minimum [Member]"
       }
      }
     },
     "localname": "MinimumMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_ProductOrServiceAxis": {
     "auth_ref": [
      "r137",
      "r209",
      "r211",
      "r378",
      "r379"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Product Or Service [Axis]",
        "terseLabel": "Product and Service"
       }
      }
     },
     "localname": "ProductOrServiceAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_ProductsAndServicesDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Products And Services [Domain]",
        "terseLabel": "Product and Service"
       }
      }
     },
     "localname": "ProductsAndServicesDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RangeAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Range [Axis]",
        "terseLabel": "Statistical Measurement"
       }
      }
     },
     "localname": "RangeAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_RangeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Range [Member]",
        "terseLabel": "Statistical Measurement"
       }
      }
     },
     "localname": "RangeMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_RepurchaseAgreementCounterpartyNameDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Repurchase Agreement Counterparty Name [Domain]",
        "terseLabel": "Counterparty Name"
       }
      }
     },
     "localname": "RepurchaseAgreementCounterpartyNameDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_SegmentGeographicalDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Segment Geographical [Domain]",
        "terseLabel": "Geographical"
       }
      }
     },
     "localname": "SegmentGeographicalDomain",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "srt_StatementGeographicalAxis": {
     "auth_ref": [
      "r138",
      "r209",
      "r212",
      "r380",
      "r382",
      "r383"
     ],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement Geographical [Axis]",
        "terseLabel": "Geographical"
       }
      }
     },
     "localname": "StatementGeographicalAxis",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "srt_SubsidiaryIssuerMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Subsidiary Issuer [Member]",
        "terseLabel": "Joseph T. Ryerson [Member]"
       }
      }
     },
     "localname": "SubsidiaryIssuerMember",
     "nsuri": "http://fasb.org/srt/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountingPoliciesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Accounting Policies [Abstract]"
       }
      }
     },
     "localname": "AccountingPoliciesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccountingStandardsUpdate201602Member": {
     "auth_ref": [
      "r322"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accounting Standards Update 2016-02 Leases (Topic 842).",
        "label": "Accounting Standards Update201602 [Member]",
        "terseLabel": "ASU 2016-02 [Member]"
       }
      }
     },
     "localname": "AccountingStandardsUpdate201602Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccountsPayableCurrent": {
     "auth_ref": [
      "r42"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10180.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
        "label": "Accounts Payable Current",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "AccountsPayableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsPayableFairValueDisclosure": {
     "auth_ref": [
      "r313"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of liabilities incurred for goods and services received that are used in an entity's business and related party payables.",
        "label": "Accounts Payable Fair Value Disclosure",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "AccountsPayableFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccountsReceivableAllowanceForCreditLossTableTextBlock": {
     "auth_ref": [
      "r149"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of allowance for credit loss on accounts receivable.",
        "label": "Accounts Receivable Allowance For Credit Loss Table [Text Block]",
        "terseLabel": "Schedule of Reconciliation of Provision for Credit Losses"
       }
      }
     },
     "localname": "AccountsReceivableAllowanceForCreditLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_AccountsReceivableGrossCurrent": {
     "auth_ref": [
      "r139",
      "r140"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
        "label": "Accounts Receivable Gross Current",
        "terseLabel": "Accounts receivables from contracts with customers"
       }
      }
     },
     "localname": "AccountsReceivableGrossCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember": {
     "auth_ref": [
      "r70",
      "r76",
      "r79",
      "r231",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans including the portion attributable to the noncontrolling interest.",
        "label": "Accumulated Defined Benefit Plans Adjustment Including Portion Attributable To Noncontrolling Interest [Member]",
        "terseLabel": "Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": {
     "auth_ref": [
      "r70",
      "r76",
      "r79",
      "r231",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent.",
        "label": "Accumulated Defined Benefit Plans Adjustment [Member]",
        "terseLabel": "Benefit Plan Liabilities [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember": {
     "auth_ref": [
      "r69",
      "r76",
      "r79",
      "r230",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive income (loss) related to gain (loss) component of defined benefit plans including the portion attributable to the noncontrolling interest.",
        "label": "Accumulated Defined Benefit Plans Adjustment Net Gain Loss Including Portion Attributable To Noncontrolling Interest [Member]",
        "terseLabel": "Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Actuarial Loss [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentNetGainLossIncludingPortionAttributableToNoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember": {
     "auth_ref": [
      "r72",
      "r76",
      "r79",
      "r230",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive (income) loss related to prior service cost (credit) component of defined benefit plans including the portion attributable to the noncontrolling interest.",
        "label": "Accumulated Defined Benefit Plans Adjustment Net Prior Service Including Portion Attributable To Noncontrolling Interest [Member]",
        "terseLabel": "Amortization of Defined Benefit Pension and Other Post-retirement Benefit Plan Items, Prior Service Credits [Member]"
       }
      }
     },
     "localname": "AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceIncludingPortionAttributableToNoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": {
     "auth_ref": [
      "r39",
      "r169"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10310.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.",
        "label": "Accumulated Depreciation Depletion And Amortization Property Plant And Equipment",
        "terseLabel": "Less: Accumulated depreciation",
        "verboseLabel": "Accumulated amortization"
       }
      }
     },
     "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember": {
     "auth_ref": [
      "r76",
      "r86",
      "r268"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive income (loss) from gain (loss) of derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.",
        "label": "Accumulated Gain Loss Net Cash Flow Hedge Parent [Member]",
        "terseLabel": "Cash Flow Hedge - Interest Rate Swap [Member]"
       }
      }
     },
     "localname": "AccumulatedGainLossNetCashFlowHedgeParentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Accumulated Other Comprehensive Income Loss [Line Items]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r73",
      "r75",
      "r76"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10110.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
        "label": "Accumulated Other Comprehensive Income Loss Net Of Tax",
        "periodEndLabel": "Accumulated other comprehensive income (loss) net of tax, ending balance",
        "periodStartLabel": "Accumulated other comprehensive income (loss) net of tax, beginning balance",
        "terseLabel": "Accumulated other comprehensive loss"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss).",
        "label": "Accumulated Other Comprehensive Income Loss [Table]",
        "terseLabel": "Accumulated Other Comprehensive Income Loss [Table]"
       }
      }
     },
     "localname": "AccumulatedOtherComprehensiveIncomeLossTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AccumulatedTranslationAdjustmentMember": {
     "auth_ref": [
      "r68",
      "r76",
      "r79",
      "r269"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Accumulated other comprehensive income (loss) resulting from foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to the parent.",
        "label": "Accumulated Translation Adjustment [Member]",
        "terseLabel": "Foreign Currency Translation [Member]"
       }
      }
     },
     "localname": "AccumulatedTranslationAdjustmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdditionalPaidInCapitalCommonStock": {
     "auth_ref": [
      "r25"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10080.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.",
        "label": "Additional Paid In Capital Common Stock",
        "terseLabel": "Capital in excess of par value"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalCommonStock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdditionalPaidInCapitalMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
        "label": "Additional Paid In Capital [Member]",
        "terseLabel": "Capital in Excess of Par Value [Member]"
       }
      }
     },
     "localname": "AdditionalPaidInCapitalMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": {
     "auth_ref": [
      "r121"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by new accounting pronouncement.",
        "label": "Adjustments For New Accounting Pronouncements [Axis]",
        "terseLabel": "Adjustments for New Accounting Pronouncements"
       }
      }
     },
     "localname": "AdjustmentsForNewAccountingPronouncementsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": {
     "auth_ref": [
      "r246",
      "r247",
      "r248",
      "r249"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
        "label": "Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value",
        "terseLabel": "Stock-based compensation expense"
       }
      }
     },
     "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r109"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10140.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The sum of adjustments which are added to or deducted from net income or loss, including the portion attributable to noncontrolling interest, to reflect cash provided by or used in operating activities, in accordance with the indirect cash flow method.",
        "label": "Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities",
        "totalLabel": "Net adjustments"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract]",
        "terseLabel": "Adjustments to reconcile net income to net cash provided by (used in) operating activities:"
       }
      }
     },
     "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivable": {
     "auth_ref": [
      "r141",
      "r143",
      "r145",
      "r148"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on accounts receivable.",
        "label": "Allowance For Doubtful Accounts Receivable",
        "periodEndLabel": "Balance at March 31, 2020",
        "periodStartLabel": "Balance at January 1, 2020"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesScheduleOfReconciliationOfProvisionForCreditLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": {
     "auth_ref": [
      "r30",
      "r141",
      "r143"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of allowance for credit loss on accounts receivable, classified as current.",
        "label": "Allowance For Doubtful Accounts Receivable Current",
        "terseLabel": "Receivables, provisions"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivableCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs": {
     "auth_ref": [
      "r147"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of direct write-downs of accounts receivable charged against the allowance.",
        "label": "Allowance For Doubtful Accounts Receivable Write Offs",
        "negatedLabel": "Write-offs charged against allowance"
       }
      }
     },
     "localname": "AllowanceForDoubtfulAccountsReceivableWriteOffs",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesScheduleOfReconciliationOfProvisionForCreditLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Assets": {
     "auth_ref": [
      "r135",
      "r350",
      "r366"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets",
        "totalLabel": "Total assets"
       }
      }
     },
     "localname": "Assets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets [Abstract]",
        "terseLabel": "Assets"
       }
      }
     },
     "localname": "AssetsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsCurrent": {
     "auth_ref": [
      "r7",
      "r8",
      "r57"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10240.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
        "label": "Assets Current",
        "totalLabel": "Total current assets"
       }
      }
     },
     "localname": "AssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_AssetsCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Assets Current [Abstract]",
        "terseLabel": "Current assets:"
       }
      }
     },
     "localname": "AssetsCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent": {
     "auth_ref": [
      "r0",
      "r1",
      "r2",
      "r3",
      "r166",
      "r172"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.",
        "label": "Assets Of Disposal Group Including Discontinued Operation Current",
        "terseLabel": "Prepaid expenses and other current assets \u2013 assets held for sale"
       }
      }
     },
     "localname": "AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_BalanceSheetLocationAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location on balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Axis]",
        "terseLabel": "Balance Sheet Location"
       }
      }
     },
     "localname": "BalanceSheetLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_BalanceSheetLocationDomain": {
     "auth_ref": [
      "r279",
      "r284"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the balance sheet (statement of financial position).",
        "label": "Balance Sheet Location [Domain]",
        "terseLabel": "Balance Sheet Location"
       }
      }
     },
     "localname": "BalanceSheetLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_BaseRateMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Minimum rate investor will accept.",
        "label": "Base Rate [Member]",
        "terseLabel": "Base Rate [Member]"
       }
      }
     },
     "localname": "BaseRateMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CarryingReportedAmountFairValueDisclosureMember": {
     "auth_ref": [
      "r314",
      "r315"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured as reported on the statement of financial position (balance sheet).",
        "label": "Carrying Reported Amount Fair Value Disclosure [Member]",
        "terseLabel": "Carrying Amount [Member]"
       }
      }
     },
     "localname": "CarryingReportedAmountFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CashAndCashEquivalentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Cash And Cash Equivalents [Abstract]"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CashAndCashEquivalentsAtCarryingValue": {
     "auth_ref": [
      "r5",
      "r37",
      "r110"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10320.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "label": "Cash And Cash Equivalents At Carrying Value",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsAtCarryingValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashAndCashEquivalentsDisclosureTextBlock": {
     "auth_ref": [
      "r13"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for cash and cash equivalent footnotes,  which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.",
        "label": "Cash And Cash Equivalents Disclosure [Text Block]",
        "terseLabel": "Cash, Cash Equivalents, and Restricted Cash"
       }
      }
     },
     "localname": "CashAndCashEquivalentsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCash"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CashAndCashEquivalentsFairValueDisclosure": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash And Cash Equivalents Fair Value Disclosure",
        "terseLabel": "Cash and cash equivalents"
       }
      }
     },
     "localname": "CashAndCashEquivalentsFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents": {
     "auth_ref": [
      "r103",
      "r110",
      "r115"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents",
        "totalLabel": "Total cash, cash equivalents, and restricted cash"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": {
     "auth_ref": [
      "r103",
      "r110",
      "r115"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations",
        "periodEndLabel": "Cash, cash equivalents, and restricted cash\u2014end of period",
        "periodStartLabel": "Cash, cash equivalents, and restricted cash\u2014beginning of period"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect": {
     "auth_ref": [
      "r103",
      "r316"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10010.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect",
        "totalLabel": "Net increase (decrease) in cash, cash equivalents, and restricted cash"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": {
     "auth_ref": [
      "r103",
      "r316"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect",
        "totalLabel": "Net change in cash, cash equivalents, and restricted cash"
       }
      }
     },
     "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ChangeInContractWithCustomerAssetAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Change In Contract With Customer Asset [Abstract]",
        "terseLabel": "Changes in the Contract Assets"
       }
      }
     },
     "localname": "ChangeInContractWithCustomerAssetAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ChangeInContractWithCustomerLiabilityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Change In Contract With Customer Liability [Abstract]",
        "terseLabel": "Changes in the Contract Liabilities"
       }
      }
     },
     "localname": "ChangeInContractWithCustomerLiabilityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingencies": {
     "auth_ref": [
      "r51",
      "r177",
      "r358",
      "r373"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10020.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.",
        "label": "Commitments And Contingencies",
        "terseLabel": "Commitments and contingencies"
       }
      }
     },
     "localname": "CommitmentsAndContingencies",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Commitments And Contingencies Disclosure [Abstract]"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": {
     "auth_ref": [
      "r176",
      "r186"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for commitments and contingencies.",
        "label": "Commitments And Contingencies Disclosure [Text Block]",
        "terseLabel": "Commitments and Contingencies"
       }
      }
     },
     "localname": "CommitmentsAndContingenciesDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingencies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CommonStockMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Stock that is subordinate to all other stock of the issuer.",
        "label": "Common Stock [Member]",
        "terseLabel": "Common Stock [Member]"
       }
      }
     },
     "localname": "CommonStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CommonStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r23"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of common stock.",
        "label": "Common Stock Par Or Stated Value Per Share",
        "terseLabel": "Common stock, par value"
       }
      }
     },
     "localname": "CommonStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_CommonStockSharesAuthorized": {
     "auth_ref": [
      "r23"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
        "label": "Common Stock Shares Authorized",
        "terseLabel": "Common stock, shares authorized"
       }
      }
     },
     "localname": "CommonStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockSharesIssued": {
     "auth_ref": [
      "r23"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.",
        "label": "Common Stock Shares Issued",
        "periodEndLabel": "Ending Balance, shares",
        "periodStartLabel": "Beginning Balance, shares",
        "terseLabel": "Common stock, shares issued"
       }
      }
     },
     "localname": "CommonStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_CommonStockValue": {
     "auth_ref": [
      "r23"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10070.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Common Stock Value",
        "terseLabel": "Common stock, $0.01 par value; 100,000,000 shares authorized; 37,996,261 shares issued at 2020 and 2019"
       }
      }
     },
     "localname": "CommonStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CompensationAndRetirementDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Compensation And Retirement Disclosure [Abstract]"
       }
      }
     },
     "localname": "CompensationAndRetirementDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTax": {
     "auth_ref": [
      "r82",
      "r84",
      "r85"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income Net Of Tax",
        "totalLabel": "Comprehensive income attributable to Ryerson Holding Corporation"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r82",
      "r84",
      "r263",
      "r264",
      "r272"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10020.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest",
        "terseLabel": "Less: Comprehensive income attributable to noncontrolling interest"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r82",
      "r84",
      "r262",
      "r272"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10010.0,
       "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.",
        "label": "Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest",
        "terseLabel": "Comprehensive income"
       }
      }
     },
     "localname": "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock": {
     "auth_ref": [
      "r205"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of contract balances and changes in contract balances.",
        "label": "Contract With Customer Asset And Liability Table [Text Block]",
        "terseLabel": "Summary of Significant Changes in Contract Assets and Contract Liabilities Balances"
       }
      }
     },
     "localname": "ContractWithCustomerAssetAndLiabilityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ContractWithCustomerAssetNet": {
     "auth_ref": [
      "r201",
      "r203",
      "r210"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.",
        "label": "Contract With Customer Asset Net",
        "periodEndLabel": "Ending Balance",
        "periodStartLabel": "Beginning Balance"
       }
      }
     },
     "localname": "ContractWithCustomerAssetNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerLiability": {
     "auth_ref": [
      "r201",
      "r202",
      "r210"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.",
        "label": "Contract With Customer Liability",
        "periodEndLabel": "Ending Balance",
        "periodStartLabel": "Beginning Balance"
       }
      }
     },
     "localname": "ContractWithCustomerLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized": {
     "auth_ref": [
      "r204"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.",
        "label": "Contract With Customer Liability Change In Timeframe Performance Obligation Satisfied Revenue Recognized",
        "terseLabel": "Contract liability satisfied during the period"
       }
      }
     },
     "localname": "ContractWithCustomerLiabilityChangeInTimeframePerformanceObligationSatisfiedRevenueRecognized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfSignificantChangesInContractAssetsAndContractLiabilitiesBalancesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostOfGoodsAndServicesSold": {
     "auth_ref": [
      "r92"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10140.0,
       "parentTag": "us-gaap_GrossProfit",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.",
        "label": "Cost Of Goods And Services Sold",
        "terseLabel": "Cost of materials sold"
       }
      }
     },
     "localname": "CostOfGoodsAndServicesSold",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_CostOfSalesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing cost of sales.",
        "label": "Cost Of Sales [Member]",
        "terseLabel": "Cost of Materials Sold [Member]"
       }
      }
     },
     "localname": "CostOfSalesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditFacilityAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Axis]",
        "terseLabel": "Credit Facility"
       }
      }
     },
     "localname": "CreditFacilityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditFacilityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
        "label": "Credit Facility [Domain]",
        "terseLabel": "Credit Facility"
       }
      }
     },
     "localname": "CreditFacilityDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_CreditLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Credit Loss [Abstract]"
       }
      }
     },
     "localname": "CreditLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_CreditLossFinancialInstrumentTextBlock": {
     "auth_ref": [
      "r144",
      "r150",
      "r151",
      "r152",
      "r153",
      "r154",
      "r155"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security.",
        "label": "Credit Loss Financial Instrument [Text Block]",
        "terseLabel": "Provision for Credit Losses"
       }
      }
     },
     "localname": "CreditLossFinancialInstrumentTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLosses"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.",
        "label": "Cumulative Effect Of New Accounting Principle In Period Of Adoption",
        "terseLabel": "Adoption of accounting principal"
       }
      }
     },
     "localname": "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtConversionOriginalDebtAmount1": {
     "auth_ref": [
      "r113",
      "r114"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of the original debt being converted in a noncash (or part noncash) transaction. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.",
        "label": "Debt Conversion Original Debt Amount1",
        "terseLabel": "Short term debt converted to finance lease"
       }
      }
     },
     "localname": "DebtConversionOriginalDebtAmount1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Debt Disclosure [Abstract]"
       }
      }
     },
     "localname": "DebtDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtDisclosureTextBlock": {
     "auth_ref": [
      "r191"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.",
        "label": "Debt Disclosure [Text Block]",
        "terseLabel": "Long-Term Debt"
       }
      }
     },
     "localname": "DebtDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_DebtInstrumentAxis": {
     "auth_ref": [
      "r18",
      "r19",
      "r20",
      "r351",
      "r352",
      "r364"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
        "label": "Debt Instrument [Axis]",
        "terseLabel": "Debt Instrument"
       }
      }
     },
     "localname": "DebtInstrumentAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage points added to the reference rate to compute the variable rate on the debt instrument.",
        "label": "Debt Instrument Basis Spread On Variable Rate1",
        "terseLabel": "Spread over base interest rate"
       }
      }
     },
     "localname": "DebtInstrumentBasisSpreadOnVariableRate1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentFaceAmount": {
     "auth_ref": [
      "r320",
      "r321"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of debt instrument at time of issuance.",
        "label": "Debt Instrument Face Amount",
        "terseLabel": "Debt instrument, face amount"
       }
      }
     },
     "localname": "DebtInstrumentFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentFairValue": {
     "auth_ref": [
      "r313"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.",
        "label": "Debt Instrument Fair Value",
        "terseLabel": "Long-term debt, including current portion"
       }
      }
     },
     "localname": "DebtInstrumentFairValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentInterestRateIncreaseDecrease": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Incremental percentage increase (decrease) in the stated rate on a debt instrument.",
        "label": "Debt Instrument Interest Rate Increase Decrease",
        "negatedLabel": "Reduction in interest rate on outstanding borrowing"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateIncreaseDecrease",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentInterestRateStatedPercentage": {
     "auth_ref": [
      "r48"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.",
        "label": "Debt Instrument Interest Rate Stated Percentage",
        "terseLabel": "Debt Instrument Percentage"
       }
      }
     },
     "localname": "DebtInstrumentInterestRateStatedPercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Debt Instrument [Line Items]",
        "terseLabel": "Debt Instrument [Line Items]"
       }
      }
     },
     "localname": "DebtInstrumentLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentNameDomain": {
     "auth_ref": [
      "r49"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
        "label": "Debt Instrument Name [Domain]",
        "terseLabel": "Debt Instrument, Name"
       }
      }
     },
     "localname": "DebtInstrumentNameDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPeriodAxis": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information about timing of debt redemption features under terms of the debt agreement.",
        "label": "Debt Instrument Redemption Period [Axis]",
        "terseLabel": "Debt Instrument, Redemption, Period"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPeriodAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPeriodDomain": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period as defined under terms of the debt agreement for debt redemption features.",
        "label": "Debt Instrument Redemption Period [Domain]",
        "terseLabel": "Debt Instrument, Redemption, Period"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPeriodDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPeriodOneMember": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period one representing most current period of debt redemption features under terms of the debt agreement.",
        "label": "Debt Instrument Redemption Period One [Member]",
        "terseLabel": "Redeemable Prior to May 15, 2020 [Member]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPeriodOneMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPeriodThreeMember": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period three representing third most current period of debt redemption features under terms of the debt agreement.",
        "label": "Debt Instrument Redemption Period Three [Member]",
        "terseLabel": "Redeemable May 15, 2021 and thereafter [Member]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPeriodThreeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPeriodTwoMember": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period two representing second most current period of debt redemption features under terms of the debt agreement.",
        "label": "Debt Instrument Redemption Period Two [Member]",
        "terseLabel": "Redeemable in twelve months beginning May 15, 2020 [Member]"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPeriodTwoMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DebtInstrumentRedemptionPricePercentage": {
     "auth_ref": [
      "r362"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.",
        "label": "Debt Instrument Redemption Price Percentage",
        "terseLabel": "Redemption price as a percentage of principal amount"
       }
      }
     },
     "localname": "DebtInstrumentRedemptionPricePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DebtInstrumentRepurchasedFaceAmount": {
     "auth_ref": [],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face (par) amount of the original debt instrument that was repurchased.",
        "label": "Debt Instrument Repurchased Face Amount",
        "terseLabel": "Principal amount of debt instrument repurchased"
       }
      }
     },
     "localname": "DebtInstrumentRepurchasedFaceAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtInstrumentTable": {
     "auth_ref": [
      "r49",
      "r119",
      "r193",
      "r194",
      "r195",
      "r196",
      "r319",
      "r320",
      "r321",
      "r363"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
        "label": "Debt Instrument [Table]",
        "terseLabel": "Debt Instrument [Table]"
       }
      }
     },
     "localname": "DebtInstrumentTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DebtLongtermAndShorttermCombinedAmount": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail2": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Represents the aggregate of total long-term debt, including current maturities and short-term debt.",
        "label": "Debt Longterm And Shortterm Combined Amount",
        "totalLabel": "Total debt"
       }
      }
     },
     "localname": "DebtLongtermAndShorttermCombinedAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DebtWeightedAverageInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average interest rate of debt outstanding.",
        "label": "Debt Weighted Average Interest Rate",
        "terseLabel": "Weighted average interest rate"
       }
      }
     },
     "localname": "DebtWeightedAverageInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DeferredIncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r108",
      "r117",
      "r255",
      "r256"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10170.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.",
        "label": "Deferred Income Tax Expense Benefit",
        "terseLabel": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredIncomeTaxLiabilitiesNet": {
     "auth_ref": [
      "r251",
      "r254"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10160.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.",
        "label": "Deferred Income Tax Liabilities Net",
        "terseLabel": "Deferred income taxes"
       }
      }
     },
     "localname": "DeferredIncomeTaxLiabilitiesNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DeferredTaxAssetsValuationAllowance": {
     "auth_ref": [
      "r253"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.",
        "label": "Deferred Tax Assets Valuation Allowance",
        "terseLabel": "Valuation allowance"
       }
      }
     },
     "localname": "DeferredTaxAssetsValuationAllowance",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit": {
     "auth_ref": [
      "r228",
      "r240"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10050.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation.",
        "label": "Defined Benefit Plan Actuarial Gain Loss Immediate Recognition As Component In Net Periodic Benefit Cost Credit",
        "negatedLabel": "Recognized actuarial (gain) loss"
       }
      }
     },
     "localname": "DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit": {
     "auth_ref": [
      "r229",
      "r241",
      "r243"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10060.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.",
        "label": "Defined Benefit Plan Amortization Of Prior Service Cost Credit",
        "terseLabel": "Amortization of prior service credit"
       }
      }
     },
     "localname": "DefinedBenefitPlanAmortizationOfPriorServiceCostCredit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear": {
     "auth_ref": [
      "r242"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.",
        "label": "Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year",
        "terseLabel": "Coronavirus aid, relief, and economic security act, pension contribution defer for the remainder of fiscal period."
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": {
     "auth_ref": [
      "r227",
      "r239",
      "r243"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10030.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.",
        "label": "Defined Benefit Plan Expected Return On Plan Assets",
        "negatedLabel": "Expected return on assets"
       }
      }
     },
     "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanInterestCost": {
     "auth_ref": [
      "r220",
      "r226",
      "r238",
      "r243"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost recognized for passage of time related to defined benefit plan.",
        "label": "Defined Benefit Plan Interest Cost",
        "terseLabel": "Interest cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanInterestCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": {
     "auth_ref": [
      "r224",
      "r236",
      "r243"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan.",
        "label": "Defined Benefit Plan Net Periodic Benefit Cost",
        "totalLabel": "Net periodic benefit (credit) cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanNetPeriodicBenefitCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlanServiceCost": {
     "auth_ref": [
      "r219",
      "r225",
      "r237",
      "r243"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.",
        "label": "Defined Benefit Plan Service Cost",
        "terseLabel": "Service cost"
       }
      }
     },
     "localname": "DefinedBenefitPlanServiceCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable": {
     "auth_ref": [
      "r232",
      "r233",
      "r234",
      "r235",
      "r243"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosures and provisions pertaining to defined benefit pension plans or other postretirement defined benefit plans. The arrangements are generally based on terms and conditions stipulated by the entity, and which contain a promise by the employer to pay certain amounts or awards at designated future dates, including a period after retirement, upon compliance with stipulated requirements. Excludes disclosures pertaining to defined contribution plans.",
        "label": "Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table]",
        "terseLabel": "Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table]"
       }
      }
     },
     "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]",
        "terseLabel": "Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]"
       }
      }
     },
     "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DepreciationAndAmortization": {
     "auth_ref": [
      "r108",
      "r167"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10150.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.",
        "label": "Depreciation And Amortization",
        "terseLabel": "Depreciation and amortization"
       }
      }
     },
     "localname": "DepreciationAndAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAmountOfHedgedItem": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of hedged item in hedging relationship. Excludes hedged asset or liability.",
        "label": "Derivative Amount Of Hedged Item",
        "terseLabel": "Hedged debt amount"
       }
      }
     },
     "localname": "DerivativeAmountOfHedgedItem",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeAssets": {
     "auth_ref": [
      "r61",
      "r63",
      "r313"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Assets",
        "terseLabel": "Asset Derivatives, Fair Value"
       }
      }
     },
     "localname": "DerivativeAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeContractTypeDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Financial instrument or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.",
        "label": "Derivative Contract Type [Domain]",
        "terseLabel": "Derivative Contract"
       }
      }
     },
     "localname": "DerivativeContractTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiability": {
     "auth_ref": [
      "r59",
      "r66",
      "r282",
      "r346"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.",
        "label": "Derivative Fair Value Of Derivative Liability",
        "terseLabel": "Liability Derivatives, Fair Value"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral": {
     "auth_ref": [
      "r62",
      "r64",
      "r296"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral",
        "terseLabel": "Derivative liabilities, offset against cash collateral"
       }
      }
     },
     "localname": "DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeFixedInterestRate": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fixed interest rate related to the interest rate derivative.",
        "label": "Derivative Fixed Interest Rate",
        "terseLabel": "Derivative fixed interest rate"
       }
      }
     },
     "localname": "DerivativeFixedInterestRate",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_DerivativeGainLossOnDerivativeNet": {
     "auth_ref": [
      "r281"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10220.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.",
        "label": "Derivative Gain Loss On Derivative Net",
        "negatedLabel": "Non-cash (gain) loss from derivatives",
        "verboseLabel": "Amount of Gain/(Loss) Recognized in Income on Derivatives"
       }
      }
     },
     "localname": "DerivativeGainLossOnDerivativeNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeInstrumentRiskAxis": {
     "auth_ref": [
      "r280",
      "r283",
      "r289",
      "r294"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of derivative contract.",
        "label": "Derivative Instrument Risk [Axis]",
        "terseLabel": "Derivative Instrument",
        "verboseLabel": "Interest Rate Swaps [Member]"
       }
      }
     },
     "localname": "DerivativeInstrumentRiskAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable": {
     "auth_ref": [
      "r277",
      "r280",
      "r289",
      "r294",
      "r295",
      "r297",
      "r298"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.",
        "label": "Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table]",
        "terseLabel": "Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Derivative Instruments Gain Loss [Line Items]",
        "terseLabel": "Derivative Instruments Gain Loss [Line Items]"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet": {
     "auth_ref": [
      "r287",
      "r293"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.",
        "label": "Derivative Instruments Gain Loss Reclassified From Accumulated O C I Into Income Effective Portion Net",
        "verboseLabel": "Amount of Gain/(Loss) Reclassified from Accumulated Other Comprehensive Income into Income"
       }
      }
     },
     "localname": "DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilities": {
     "auth_ref": [
      "r61",
      "r63",
      "r313"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.",
        "label": "Derivative Liabilities",
        "terseLabel": "Liability Derivatives, Fair Value",
        "verboseLabel": "Derivative liability balance"
       }
      }
     },
     "localname": "DerivativeLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset": {
     "auth_ref": [
      "r60",
      "r274"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.",
        "label": "Derivative Liability Collateral Right To Reclaim Cash Offset",
        "terseLabel": "Derivative liabilities, offsetting cash collateral"
       }
      }
     },
     "localname": "DerivativeLiabilityCollateralRightToReclaimCashOffset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeNonmonetaryNotionalAmountMass": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nominal mass used to calculate payments on a derivative instrument.",
        "label": "Derivative Nonmonetary Notional Amount Mass",
        "terseLabel": "Derivative Instruments, Notional Value"
       }
      }
     },
     "localname": "DerivativeNonmonetaryNotionalAmountMass",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "massItemType"
    },
    "us-gaap_DerivativeNonmonetaryNotionalAmountVolume": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nominal volume used to calculate payments on a derivative instrument.",
        "label": "Derivative Nonmonetary Notional Amount Volume",
        "terseLabel": "Derivative Instruments, Notional Value"
       }
      }
     },
     "localname": "DerivativeNonmonetaryNotionalAmountVolume",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "volumeItemType"
    },
    "us-gaap_DerivativeNotionalAmount": {
     "auth_ref": [
      "r275",
      "r276"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Nominal or face amount used to calculate payment on derivative.",
        "label": "Derivative Notional Amount",
        "terseLabel": "Derivative notional amount"
       }
      }
     },
     "localname": "DerivativeNotionalAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_DerivativeNumberOfInstrumentsHeld": {
     "auth_ref": [
      "r275",
      "r276"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The number of derivative instruments of a particular group held by the entity.",
        "label": "Derivative Number Of Instruments Held",
        "terseLabel": "Number of derivative instruments"
       }
      }
     },
     "localname": "DerivativeNumberOfInstrumentsHeld",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_DerivativeTermOfContract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
        "label": "Derivative Term Of Contract",
        "terseLabel": "General term for commodity and exchange contracts"
       }
      }
     },
     "localname": "DerivativeTermOfContract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_DerivativesFairValueLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Derivatives Fair Value [Line Items]",
        "terseLabel": "Derivatives Fair Value [Line Items]"
       }
      }
     },
     "localname": "DerivativesFairValueLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DesignatedAsHedgingInstrumentMember": {
     "auth_ref": [
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Designated As Hedging Instrument [Member]",
        "terseLabel": "Derivatives designated as hedging instruments under ASC 815 [Member]"
       }
      }
     },
     "localname": "DesignatedAsHedgingInstrumentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_DisaggregationOfRevenueLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Disaggregation Of Revenue [Line Items]",
        "terseLabel": "Disaggregation Of Revenue [Line Items]"
       }
      }
     },
     "localname": "DisaggregationOfRevenueLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisaggregationOfRevenueTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
        "label": "Disaggregation Of Revenue [Table]",
        "terseLabel": "Disaggregation Of Revenue [Table]"
       }
      }
     },
     "localname": "DisaggregationOfRevenueTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_DisaggregationOfRevenueTableTextBlock": {
     "auth_ref": [
      "r209"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
        "label": "Disaggregation Of Revenue Table [Text Block]",
        "terseLabel": "Summary of Disaggregated Revenue"
       }
      }
     },
     "localname": "DisaggregationOfRevenueTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EarlyRepaymentOfSeniorDebt": {
     "auth_ref": [
      "r99"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.",
        "label": "Early Repayment Of Senior Debt",
        "terseLabel": "Debt instruments senior notes retired"
       }
      }
     },
     "localname": "EarlyRepaymentOfSeniorDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EarningsPerShareAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share [Abstract]"
       }
      }
     },
     "localname": "EarningsPerShareAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareBasic": {
     "auth_ref": [
      "r89",
      "r122",
      "r126",
      "r128",
      "r129",
      "r130",
      "r132",
      "r361",
      "r376"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
        "label": "Earnings Per Share Basic",
        "terseLabel": "Basic earnings per share",
        "verboseLabel": "Basic"
       }
      }
     },
     "localname": "EarningsPerShareBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareBasicAndDilutedAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Earnings Per Share Basic And Diluted [Abstract]",
        "terseLabel": "Earnings per share"
       }
      }
     },
     "localname": "EarningsPerShareBasicAndDilutedAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_EarningsPerShareDiluted": {
     "auth_ref": [
      "r89",
      "r122",
      "r126",
      "r128",
      "r129",
      "r130",
      "r132",
      "r361",
      "r376"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
        "label": "Earnings Per Share Diluted",
        "terseLabel": "Diluted earnings per share",
        "verboseLabel": "Diluted"
       }
      }
     },
     "localname": "EarningsPerShareDiluted",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_EarningsPerShareTextBlock": {
     "auth_ref": [
      "r133"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for earnings per share.",
        "label": "Earnings Per Share [Text Block]",
        "terseLabel": "Earnings Per Share"
       }
      }
     },
     "localname": "EarningsPerShareTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShare"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": {
     "auth_ref": [
      "r316"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10020.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations",
        "terseLabel": "Effect of exchange rate changes on cash, cash equivalents, and restricted cash"
       }
      }
     },
     "localname": "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_EnergyRelatedDerivativeMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to energy, for example, but not limited to, crude oil, electricity and natural gas.",
        "label": "Energy Related Derivative [Member]",
        "terseLabel": "Crude Oil Contracts [Member]"
       }
      }
     },
     "localname": "EnergyRelatedDerivativeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Equity [Abstract]"
       }
      }
     },
     "localname": "EquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_EquityComponentDomain": {
     "auth_ref": [
      "r192"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
        "label": "Equity Component [Domain]",
        "terseLabel": "Equity Component"
       }
      }
     },
     "localname": "EquityComponentDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_EstimateOfFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r313"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured as an estimate of fair value.",
        "label": "Estimate Of Fair Value Fair Value Disclosure [Member]",
        "terseLabel": "Fair Value [Member]"
       }
      }
     },
     "localname": "EstimateOfFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]",
        "terseLabel": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable": {
     "auth_ref": [
      "r300",
      "r301",
      "r302",
      "r309"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
        "label": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]",
        "terseLabel": "Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]"
       }
      }
     },
     "localname": "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnNonrecurringBasisTextBlock": {
     "auth_ref": [
      "r300",
      "r301",
      "r303"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).",
        "label": "Fair Value Assets Measured On Nonrecurring Basis [Text Block]",
        "terseLabel": "Assets and Liabilities Measured and Recorded at Fair Value on Non-Recurring Basis"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnNonrecurringBasisTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain": {
     "auth_ref": [
      "r306"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Class of asset.",
        "label": "Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation By Asset Class [Domain]",
        "terseLabel": "Asset Class"
       }
      }
     },
     "localname": "FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueByAssetClassAxis": {
     "auth_ref": [
      "r300",
      "r309"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by class of asset.",
        "label": "Fair Value By Asset Class [Axis]",
        "terseLabel": "Asset Class"
       }
      }
     },
     "localname": "FairValueByAssetClassAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByBalanceSheetGroupingTextBlock": {
     "auth_ref": [
      "r300",
      "r314"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.",
        "label": "Fair Value By Balance Sheet Grouping [Text Block]",
        "terseLabel": "Carrying and Estimated Fair Values of Financial Instruments"
       }
      }
     },
     "localname": "FairValueByBalanceSheetGroupingTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FairValueByFairValueHierarchyLevelAxis": {
     "auth_ref": [
      "r222",
      "r223",
      "r243",
      "r301",
      "r342"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
        "label": "Fair Value By Fair Value Hierarchy Level [Axis]",
        "terseLabel": "Level 2 [Member]"
       }
      }
     },
     "localname": "FairValueByFairValueHierarchyLevelAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementBasisAxis": {
     "auth_ref": [
      "r300",
      "r310"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement basis.",
        "label": "Fair Value By Measurement Basis [Axis]",
        "terseLabel": "Measurement Basis"
       }
      }
     },
     "localname": "FairValueByMeasurementBasisAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueByMeasurementFrequencyAxis": {
     "auth_ref": [
      "r300",
      "r301",
      "r304",
      "r305",
      "r311"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by measurement frequency.",
        "label": "Fair Value By Measurement Frequency [Axis]",
        "terseLabel": "Measurement Frequency"
       }
      }
     },
     "localname": "FairValueByMeasurementFrequencyAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueDisclosureItemAmountsDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value.",
        "label": "Fair Value Disclosure Item Amounts [Domain]",
        "terseLabel": "Fair Value Measurement"
       }
      }
     },
     "localname": "FairValueDisclosureItemAmountsDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueDisclosuresAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Fair Value Disclosures [Abstract]"
       }
      }
     },
     "localname": "FairValueDisclosuresAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_FairValueInputsLevel1Member": {
     "auth_ref": [
      "r222",
      "r223",
      "r243",
      "r301",
      "r343"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
        "label": "Fair Value Inputs Level1 [Member]",
        "terseLabel": "Level 1 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel1Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel2Member": {
     "auth_ref": [
      "r222",
      "r223",
      "r243",
      "r301",
      "r344"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
        "label": "Fair Value Inputs Level2 [Member]",
        "terseLabel": "Level 2 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel2Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueInputsLevel3Member": {
     "auth_ref": [
      "r222",
      "r223",
      "r243",
      "r301",
      "r345"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
        "label": "Fair Value Inputs Level3 [Member]",
        "terseLabel": "Level 3 [Member]"
       }
      }
     },
     "localname": "FairValueInputsLevel3Member",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementFrequencyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measurement frequency.",
        "label": "Fair Value Measurement Frequency [Domain]",
        "terseLabel": "Measurement Frequency"
       }
      }
     },
     "localname": "FairValueMeasurementFrequencyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
        "label": "Fair Value Measurements Fair Value Hierarchy [Domain]",
        "terseLabel": "Fair Value Hierarchy and NAV"
       }
      }
     },
     "localname": "FairValueMeasurementsFairValueHierarchyDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsNonrecurringMember": {
     "auth_ref": [
      "r300",
      "r301",
      "r304",
      "r305",
      "r307",
      "r311"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Infrequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, not frequently measured at fair value.",
        "label": "Fair Value Measurements Nonrecurring [Member]",
        "terseLabel": "Fair Value, Measurements, Nonrecurring [Member]"
       }
      }
     },
     "localname": "FairValueMeasurementsNonrecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueOnNonRecurringBasisDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValueMeasurementsRecurringMember": {
     "auth_ref": [
      "r308",
      "r311"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Frequent fair value measurement. Includes, but is not limited to, fair value adjustment for impairment of asset, liability or equity, frequently measured at fair value.",
        "label": "Fair Value Measurements Recurring [Member]",
        "terseLabel": "Fair Value, Measurements, Recurring [Member]"
       }
      }
     },
     "localname": "FairValueMeasurementsRecurringMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable": {
     "auth_ref": [
      "r279",
      "r285",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule that discloses the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.",
        "label": "Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table]",
        "terseLabel": "Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table]"
       }
      }
     },
     "localname": "FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinanceLeaseInterestExpense": {
     "auth_ref": [
      "r326",
      "r331",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": 10030.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest expense on finance lease liability.",
        "label": "Finance Lease Interest Expense",
        "terseLabel": "Interest on lease liabilities"
       }
      }
     },
     "localname": "FinanceLeaseInterestExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseInterestPaymentOnLiability": {
     "auth_ref": [
      "r328",
      "r335"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of interest paid on finance lease liability.",
        "label": "Finance Lease Interest Payment On Liability",
        "terseLabel": "Operating cash flows from finance leases"
       }
      }
     },
     "localname": "FinanceLeaseInterestPaymentOnLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Finance Lease Liabilities Payments Due [Abstract]",
        "terseLabel": "Finance Leases"
       }
      }
     },
     "localname": "FinanceLeaseLiabilitiesPaymentsDueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_FinanceLeaseLiability": {
     "auth_ref": [
      "r324",
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": 10020.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease.",
        "label": "Finance Lease Liability",
        "terseLabel": "Present value of lease liabilities"
       }
      }
     },
     "localname": "FinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityCurrent": {
     "auth_ref": [
      "r324"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10020.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.",
        "label": "Finance Lease Liability Current",
        "terseLabel": "Finance lease liabilities, current",
        "verboseLabel": "Finance leases, current portion"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList": {
     "auth_ref": [
      "r325"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates line item in statement of financial position that includes current finance lease liability.",
        "label": "Finance Lease Liability Current Statement Of Financial Position Extensible List",
        "terseLabel": "Finance lease, Liability, Current, Statement of financial position [Extensible List]"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "extensibleListItemType"
    },
    "us-gaap_FinanceLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r324"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10040.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseLiabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.",
        "label": "Finance Lease Liability Noncurrent",
        "terseLabel": "Finance lease liabilities, noncurrent"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList": {
     "auth_ref": [
      "r325"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates line item in statement of financial position that includes noncurrent finance lease liability.",
        "label": "Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List",
        "terseLabel": "Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "extensibleListItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease.",
        "label": "Finance Lease Liability Payments Due",
        "totalLabel": "Total lease payments"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10060.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year.",
        "label": "Finance Lease Liability Payments Due After Year Five",
        "terseLabel": "After 2024"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10050.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year.",
        "label": "Finance Lease Liability Payments Due Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10040.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.",
        "label": "Finance Lease Liability Payments Due Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10030.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.",
        "label": "Finance Lease Liability Payments Due Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.",
        "label": "Finance Lease Liability Payments Due Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.",
        "label": "Finance Lease Liability Payments Remainder Of Fiscal Year",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": 10010.0,
       "parentTag": "us-gaap_FinanceLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.",
        "label": "Finance Lease Liability Undiscounted Excess Amount",
        "negatedLabel": "Less: Interest"
       }
      }
     },
     "localname": "FinanceLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeasePrincipalPayments": {
     "auth_ref": [
      "r327",
      "r335"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10090.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for principal payment on finance lease.",
        "label": "Finance Lease Principal Payments",
        "negatedLabel": "Principal payments on finance lease obligations",
        "terseLabel": "Financing cash flows from finance leases"
       }
      }
     },
     "localname": "FinanceLeasePrincipalPayments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAsset": {
     "auth_ref": [
      "r323"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10060.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseRightOfUseAsset",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's right to use underlying asset under finance lease.",
        "label": "Finance Lease Right Of Use Asset",
        "terseLabel": "Finance lease assets"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAssetAmortization": {
     "auth_ref": [
      "r326",
      "r331",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of amortization expense attributable to right-of-use asset from finance lease.",
        "label": "Finance Lease Right Of Use Asset Amortization",
        "terseLabel": "Amortization of lease assets"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAssetAmortization",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList": {
     "auth_ref": [
      "r325"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Indicates line item in statement of financial position that includes finance lease right-of-use asset.",
        "label": "Finance Lease Right Of Use Asset Statement Of Financial Position Extensible List",
        "terseLabel": "Finance lease, Right-of-use asset, Statement of financial position [Extensible List]"
       }
      }
     },
     "localname": "FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail"
     ],
     "xbrltype": "extensibleListItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r338",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for finance lease calculated at point in time.",
        "label": "Finance Lease Weighted Average Discount Rate Percent",
        "terseLabel": "Finance leases, Weighted-average discount rate"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r337",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Finance Lease Weighted Average Remaining Lease Term1",
        "terseLabel": "Finance leases, Weighted-average remaining lease term"
       }
      }
     },
     "localname": "FinanceLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_FinancialInstrumentsDisclosureTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures.",
        "label": "Financial Instruments Disclosure [Text Block]",
        "terseLabel": "Derivatives and Fair Value Measurements"
       }
      }
     },
     "localname": "FinancialInstrumentsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_FiniteLivedIntangibleAssetsNet": {
     "auth_ref": [
      "r164"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10270.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
        "label": "Finite Lived Intangible Assets Net",
        "terseLabel": "Other intangible assets"
       }
      }
     },
     "localname": "FiniteLivedIntangibleAssetsNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ForeignExchangeContractMember": {
     "auth_ref": [
      "r222",
      "r292"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument whose primary underlying risk is tied to foreign exchange rates.",
        "label": "Foreign Exchange Contract [Member]",
        "terseLabel": "Foreign Exchange Contracts [Member]"
       }
      }
     },
     "localname": "ForeignExchangeContractMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_GainsLossesOnExtinguishmentOfDebt": {
     "auth_ref": [
      "r108",
      "r189",
      "r190"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10210.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.",
        "label": "Gains Losses On Extinguishment Of Debt",
        "negatedLabel": "(Gain) loss on retirement of debt",
        "terseLabel": "Gain (loss) on retirement of debt"
       }
      }
     },
     "localname": "GainsLossesOnExtinguishmentOfDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Goodwill": {
     "auth_ref": [
      "r159",
      "r161"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10280.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "Goodwill",
        "terseLabel": "Goodwill"
       }
      }
     },
     "localname": "Goodwill",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Goodwill And Intangible Assets Disclosure [Abstract]"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock": {
     "auth_ref": [
      "r165"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for goodwill and intangible assets.",
        "label": "Goodwill And Intangible Assets Disclosure [Text Block]",
        "terseLabel": "Goodwill and Other Intangible Assets"
       }
      }
     },
     "localname": "GoodwillAndIntangibleAssetsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_GoodwillImpairmentLoss": {
     "auth_ref": [
      "r108",
      "r160",
      "r162",
      "r163"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
        "label": "Goodwill Impairment Loss",
        "terseLabel": "Impairment charge"
       }
      }
     },
     "localname": "GoodwillImpairmentLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_GrossProfit": {
     "auth_ref": [
      "r91"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10100.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.",
        "label": "Gross Profit",
        "totalLabel": "Gross profit"
       }
      }
     },
     "localname": "GrossProfit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_HedgingDesignationAxis": {
     "auth_ref": [
      "r277",
      "r295"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Axis]",
        "terseLabel": "Hedging Designation"
       }
      }
     },
     "localname": "HedgingDesignationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_HedgingDesignationDomain": {
     "auth_ref": [
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Designation of purpose of derivative instrument.",
        "label": "Hedging Designation [Domain]",
        "terseLabel": "Hedging Designation"
       }
      }
     },
     "localname": "HedgingDesignationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": {
     "auth_ref": [
      "r87",
      "r122",
      "r347",
      "r359",
      "r377"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10050.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.",
        "label": "Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest",
        "totalLabel": "Income before income taxes"
       }
      }
     },
     "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeStatementLocationAxis": {
     "auth_ref": [
      "r171"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by location in the income statement.",
        "label": "Income Statement Location [Axis]",
        "terseLabel": "Income Statement Location"
       }
      }
     },
     "localname": "IncomeStatementLocationAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeStatementLocationDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Location in the income statement.",
        "label": "Income Statement Location [Domain]",
        "terseLabel": "Income Statement Location"
       }
      }
     },
     "localname": "IncomeStatementLocationDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxAuthorityAxis": {
     "auth_ref": [
      "r252"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by tax jurisdiction.",
        "label": "Income Tax Authority [Axis]",
        "terseLabel": "Income Tax Authority"
       }
      }
     },
     "localname": "IncomeTaxAuthorityAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxAuthorityDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Agency, division or body classification that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.",
        "label": "Income Tax Authority [Domain]",
        "terseLabel": "Income Tax Authority"
       }
      }
     },
     "localname": "IncomeTaxAuthorityDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_IncomeTaxDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Income Tax Disclosure [Abstract]"
       }
      }
     },
     "localname": "IncomeTaxDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncomeTaxDisclosureTextBlock": {
     "auth_ref": [
      "r259"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
        "label": "Income Tax Disclosure [Text Block]",
        "terseLabel": "Income Taxes"
       }
      }
     },
     "localname": "IncomeTaxDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxes"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_IncomeTaxExpenseBenefit": {
     "auth_ref": [
      "r117",
      "r134",
      "r258"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10060.0,
       "parentTag": "us-gaap_ProfitLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
        "label": "Income Tax Expense Benefit",
        "terseLabel": "Provision for income taxes",
        "verboseLabel": "Provision for income taxes"
       }
      }
     },
     "localname": "IncomeTaxExpenseBenefit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncomeTaxesPaidNet": {
     "auth_ref": [
      "r112"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.",
        "label": "Income Taxes Paid Net",
        "terseLabel": "Income taxes, net"
       }
      }
     },
     "localname": "IncomeTaxesPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccountsPayable": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10270.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.",
        "label": "Increase Decrease In Accounts Payable",
        "terseLabel": "Accounts payable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccountsPayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccruedLiabilities": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10280.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.",
        "label": "Increase Decrease In Accrued Liabilities",
        "terseLabel": "Accrued liabilities"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInAccruedTaxesPayable": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10290.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.",
        "label": "Increase Decrease In Accrued Taxes Payable",
        "terseLabel": "Accrued taxes payable/receivable"
       }
      }
     },
     "localname": "IncreaseDecreaseInAccruedTaxesPayable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInBookOverdrafts": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10080.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) in cash during the period due to the net increase or decrease in book overdrafts.",
        "label": "Increase Decrease In Book Overdrafts",
        "terseLabel": "Net increase (decrease) in book overdrafts"
       }
      }
     },
     "localname": "IncreaseDecreaseInBookOverdrafts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInInventories": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10250.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.",
        "label": "Increase Decrease In Inventories",
        "negatedLabel": "Inventories"
       }
      }
     },
     "localname": "IncreaseDecreaseInInventories",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Increase Decrease In Operating Capital [Abstract]",
        "terseLabel": "Change in operating assets and liabilities:"
       }
      }
     },
     "localname": "IncreaseDecreaseInOperatingCapitalAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_IncreaseDecreaseInOtherOperatingAssets": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10260.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in operating assets classified as other.",
        "label": "Increase Decrease In Other Operating Assets",
        "negatedLabel": "Other assets"
       }
      }
     },
     "localname": "IncreaseDecreaseInOtherOperatingAssets",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10300.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase (decrease) in obligation for pension and other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans.",
        "label": "Increase Decrease In Pension And Postretirement Obligations",
        "terseLabel": "Deferred employee benefit costs"
       }
      }
     },
     "localname": "IncreaseDecreaseInPensionAndPostretirementObligations",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncreaseDecreaseInReceivables": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10240.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.",
        "label": "Increase Decrease In Receivables",
        "negatedLabel": "Receivables"
       }
      }
     },
     "localname": "IncreaseDecreaseInReceivables",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements": {
     "auth_ref": [
      "r127",
      "r131"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.",
        "label": "Incremental Common Shares Attributable To Share Based Payment Arrangements",
        "terseLabel": "Dilutive effect of stock-based awards"
       }
      }
     },
     "localname": "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_InterestAndDebtExpense": {
     "auth_ref": [
      "r318"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10090.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest and debt related expenses associated with nonoperating financing activities of the entity.",
        "label": "Interest And Debt Expense",
        "negatedLabel": "Interest and other expense on debt"
       }
      }
     },
     "localname": "InterestAndDebtExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestPaidNet": {
     "auth_ref": [
      "r101",
      "r104",
      "r112"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.",
        "label": "Interest Paid Net",
        "terseLabel": "Interest paid to third parties, net"
       }
      }
     },
     "localname": "InterestPaidNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateCashFlowHedgeDerivativeAtFairValueNet": {
     "auth_ref": [
      "r274"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value as of the balance sheet date of all interest rate derivatives designated as cash flow hedging instruments.",
        "label": "Interest Rate Cash Flow Hedge Derivative At Fair Value Net",
        "terseLabel": "Fair value of interest rate swaps"
       }
      }
     },
     "localname": "InterestRateCashFlowHedgeDerivativeAtFairValueNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet": {
     "auth_ref": [
      "r299"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.",
        "label": "Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net",
        "terseLabel": "Derivative gain (loss) to be reclassified into interest income during next 12 months"
       }
      }
     },
     "localname": "InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InterestRateSwapMember": {
     "auth_ref": [
      "r291"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Forward based contracts in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period.",
        "label": "Interest Rate Swap [Member]",
        "terseLabel": "Interest Rate Swap [Member]",
        "verboseLabel": "Interest Rate Swaps [Member]"
       }
      }
     },
     "localname": "InterestRateSwapMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsVolumeOfCompanySActivityInDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_InventoryDisclosureAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Inventory Disclosure [Abstract]"
       }
      }
     },
     "localname": "InventoryDisclosureAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_InventoryDisclosureTextBlock": {
     "auth_ref": [
      "r158"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.",
        "label": "Inventory Disclosure [Text Block]",
        "terseLabel": "Inventories"
       }
      }
     },
     "localname": "InventoryDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventories"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_InventoryLIFOReserve": {
     "auth_ref": [
      "r56"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.",
        "label": "Inventory L I F O Reserve",
        "terseLabel": "Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at current cost"
       }
      }
     },
     "localname": "InventoryLIFOReserve",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InventoryNet": {
     "auth_ref": [
      "r6",
      "r55",
      "r157"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10350.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.",
        "label": "Inventory Net",
        "terseLabel": "Inventories",
        "verboseLabel": "In process and finished products"
       }
      }
     },
     "localname": "InventoryNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_InvestmentsAllOtherInvestmentsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Investments All Other Investments [Abstract]"
       }
      }
     },
     "localname": "InvestmentsAllOtherInvestmentsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LeaseCost": {
     "auth_ref": [
      "r339",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lease cost recognized by lessee for lease contract.",
        "label": "Lease Cost",
        "totalLabel": "Total lease expense"
       }
      }
     },
     "localname": "LeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LeaseCostAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Lease Cost [Abstract]",
        "terseLabel": "Lease Expense"
       }
      }
     },
     "localname": "LeaseCostAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LeaseCostTableTextBlock": {
     "auth_ref": [
      "r339"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.",
        "label": "Lease Cost Table [Text Block]",
        "terseLabel": "Summary of Location and Amount of Lease Expense"
       }
      }
     },
     "localname": "LeaseCostTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_LeasesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Leases [Abstract]"
       }
      }
     },
     "localname": "LeasesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeLeaseDescriptionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Lessee Lease Description [Line Items]",
        "terseLabel": "Lessee Lease Description [Line Items]"
       }
      }
     },
     "localname": "LesseeLeaseDescriptionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeLeaseDescriptionTable": {
     "auth_ref": [
      "r330"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about lessee's leases.",
        "label": "Lessee Lease Description [Table]",
        "terseLabel": "Lessee Lease Description [Table]"
       }
      }
     },
     "localname": "LesseeLeaseDescriptionTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      },
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease.",
        "label": "Lessee Operating Lease Liability Payments Due",
        "totalLabel": "Total lease payments"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10120.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Due After Year Five",
        "terseLabel": "After 2024"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10110.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Due Year Five",
        "terseLabel": "2024"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFive",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10100.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Due Year Four",
        "terseLabel": "2023"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10090.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Due Year Three",
        "terseLabel": "2022"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10080.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Due Year Two",
        "terseLabel": "2021"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail": {
       "order": 10070.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.",
        "label": "Lessee Operating Lease Liability Payments Remainder Of Fiscal Year",
        "terseLabel": "2020"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount": {
     "auth_ref": [
      "r340"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": 10030.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.",
        "label": "Lessee Operating Lease Liability Undiscounted Excess Amount",
        "negatedLabel": "Less: Interest"
       }
      }
     },
     "localname": "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LetterOfCreditMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).",
        "label": "Letter Of Credit [Member]",
        "terseLabel": "Letter Of Credit [Member]"
       }
      }
     },
     "localname": "LetterOfCreditMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LettersOfCreditOutstandingAmount": {
     "auth_ref": [],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.",
        "label": "Letters Of Credit Outstanding Amount",
        "terseLabel": "Letters of credit",
        "verboseLabel": "Letters of credit issued by our foreign subsidiaries"
       }
      }
     },
     "localname": "LettersOfCreditOutstandingAmount",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_Liabilities": {
     "auth_ref": [
      "r45"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10010.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
        "label": "Liabilities",
        "totalLabel": "Total liabilities"
       }
      }
     },
     "localname": "Liabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities [Abstract]",
        "terseLabel": "Liabilities"
       }
      }
     },
     "localname": "LiabilitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LiabilitiesAndStockholdersEquity": {
     "auth_ref": [
      "r29",
      "r354",
      "r370"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
        "label": "Liabilities And Stockholders Equity",
        "totalLabel": "Total liabilities and equity"
       }
      }
     },
     "localname": "LiabilitiesAndStockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrent": {
     "auth_ref": [
      "r47"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10120.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.",
        "label": "Liabilities Current",
        "totalLabel": "Total current liabilities"
       }
      }
     },
     "localname": "LiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LiabilitiesCurrentAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Liabilities Current [Abstract]",
        "terseLabel": "Current liabilities:"
       }
      }
     },
     "localname": "LiabilitiesCurrentAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCredit": {
     "auth_ref": [
      "r20",
      "r352",
      "r364"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "label": "Line Of Credit",
        "terseLabel": "Outstanding borrowings",
        "verboseLabel": "Ryerson Credit Facility"
       }
      }
     },
     "localname": "LineOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityCollateral": {
     "auth_ref": [
      "r17",
      "r20",
      "r116",
      "r351",
      "r352",
      "r364"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory).",
        "label": "Line Of Credit Facility Collateral",
        "terseLabel": "Line of credit facility, description of collateral"
       }
      }
     },
     "localname": "LineOfCreditFacilityCollateral",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LineOfCreditFacilityCommitmentFeePercentage": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.",
        "label": "Line Of Credit Facility Commitment Fee Percentage",
        "terseLabel": "Commitment fees on amounts not borrowed"
       }
      }
     },
     "localname": "LineOfCreditFacilityCommitmentFeePercentage",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_LineOfCreditFacilityExpirationDate1": {
     "auth_ref": [
      "r43"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Date the credit facility terminates, in CCYY-MM-DD format.",
        "label": "Line Of Credit Facility Expiration Date1",
        "terseLabel": "Credit facility maturity date"
       }
      }
     },
     "localname": "LineOfCreditFacilityExpirationDate1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "dateItemType"
    },
    "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity": {
     "auth_ref": [
      "r43"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.",
        "label": "Line Of Credit Facility Maximum Borrowing Capacity",
        "terseLabel": "Revolving credit facility maximum borrowing capacity"
       }
      }
     },
     "localname": "LineOfCreditFacilityMaximumBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity": {
     "auth_ref": [
      "r43"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).",
        "label": "Line Of Credit Facility Remaining Borrowing Capacity",
        "terseLabel": "Available credit facility"
       }
      }
     },
     "localname": "LineOfCreditFacilityRemainingBorrowingCapacity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtForeignDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LinesOfCreditCurrent": {
     "auth_ref": [
      "r18",
      "r351"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail2": {
       "order": 10010.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
        "label": "Lines Of Credit Current",
        "terseLabel": "Less: Ryerson Credit Facility - \"first in, last out\" subfacility",
        "verboseLabel": "Outstanding borrowings"
       }
      }
     },
     "localname": "LinesOfCreditCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LondonInterbankOfferedRateLIBORMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
        "label": "London Interbank Offered Rate L I B O R [Member]",
        "terseLabel": "LIBOR [Member]"
       }
      }
     },
     "localname": "LondonInterbankOfferedRateLIBORMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_LongTermDebtCurrent": {
     "auth_ref": [
      "r44"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10210.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long Term Debt Current",
        "terseLabel": "Short-term debt"
       }
      }
     },
     "localname": "LongTermDebtCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LongTermDebtNoncurrent": {
     "auth_ref": [
      "r49"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail2": {
       "order": 10040.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10130.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
        "label": "Long Term Debt Noncurrent",
        "terseLabel": "Long-term debt",
        "verboseLabel": "Total long-term debt"
       }
      }
     },
     "localname": "LongTermDebtNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_LossContingenciesLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Loss Contingencies [Line Items]",
        "terseLabel": "Loss Contingencies [Line Items]"
       }
      }
     },
     "localname": "LossContingenciesLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingenciesTable": {
     "auth_ref": [
      "r177",
      "r178",
      "r179",
      "r181",
      "r182",
      "r183",
      "r185",
      "r187",
      "r188"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Discloses the specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made. Excludes environmental contingencies, warranties and unconditional purchase obligations.",
        "label": "Loss Contingencies [Table]",
        "terseLabel": "Loss Contingencies [Table]"
       }
      }
     },
     "localname": "LossContingenciesTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingencyDamagesSought": {
     "auth_ref": [
      "r177",
      "r180",
      "r184"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Describes the form and magnitude of the award the plaintiff seeks in the legal matter, which may include an unspecified amount of money.",
        "label": "Loss Contingency Damages Sought",
        "terseLabel": "Record of decision description"
       }
      }
     },
     "localname": "LossContingencyDamagesSought",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_LossContingencyDamagesSoughtValue": {
     "auth_ref": [
      "r177",
      "r180",
      "r184"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The value (monetary amount) of the award the plaintiff seeks in the legal matter.",
        "label": "Loss Contingency Damages Sought Value",
        "terseLabel": "Estimated present value cost for construction and recovery"
       }
      }
     },
     "localname": "LossContingencyDamagesSoughtValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_MinorityInterest": {
     "auth_ref": [
      "r54",
      "r353",
      "r369"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10050.0,
       "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).",
        "label": "Minority Interest",
        "terseLabel": "Noncontrolling interest"
       }
      }
     },
     "localname": "MinorityInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivities": {
     "auth_ref": [
      "r103"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10050.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
        "label": "Net Cash Provided By Used In Financing Activities",
        "totalLabel": "Net cash provided by financing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided By Used In Financing Activities [Abstract]",
        "terseLabel": "Financing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivities": {
     "auth_ref": [
      "r103"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10040.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
        "label": "Net Cash Provided By Used In Investing Activities",
        "totalLabel": "Net cash used in investing activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided By Used In Investing Activities [Abstract]",
        "terseLabel": "Investing activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivities": {
     "auth_ref": [
      "r103",
      "r106",
      "r109"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10030.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
        "label": "Net Cash Provided By Used In Operating Activities",
        "totalLabel": "Net cash provided by (used in) operating activities"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Cash Provided By Used In Operating Activities [Abstract]",
        "terseLabel": "Operating activities:"
       }
      }
     },
     "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLoss": {
     "auth_ref": [
      "r80",
      "r83",
      "r88",
      "r109",
      "r131",
      "r360",
      "r375"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
        "label": "Net Income Loss",
        "positiveLabel": "Net income attributable to Ryerson Holding Corporation",
        "totalLabel": "Net income attributable to Ryerson Holding Corporation"
       }
      }
     },
     "localname": "NetIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NetIncomeLossAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Net Income Loss [Abstract]",
        "terseLabel": "Numerator:"
       }
      }
     },
     "localname": "NetIncomeLossAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r80",
      "r83",
      "r266",
      "r271"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10040.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of Net Income (Loss) attributable to noncontrolling interest.",
        "label": "Net Income Loss Attributable To Noncontrolling Interest",
        "terseLabel": "Less: Net income attributable to noncontrolling interest"
       }
      }
     },
     "localname": "NetIncomeLossAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "New Accounting Pronouncements And Changes In Accounting Principles [Abstract]"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": {
     "auth_ref": [
      "r123"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.",
        "label": "New Accounting Pronouncements And Changes In Accounting Principles [Text Block]",
        "terseLabel": "Recent Accounting Pronouncements"
       }
      }
     },
     "localname": "NewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRecentAccountingPronouncements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.",
        "label": "New Accounting Pronouncements Policy Policy [Text Block]",
        "terseLabel": "Recent Accounting Pronouncements"
       }
      }
     },
     "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureSummaryOfAccountingAndFinancialPoliciesPolicies"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_NonUsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Countries excluding the United States of America (US).",
        "label": "Non Us [Member]",
        "terseLabel": "Foreign Countries [Member]"
       }
      }
     },
     "localname": "NonUsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NoncontrollingInterestMember": {
     "auth_ref": [
      "r260"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent. A noncontrolling interest is sometimes called a minority interest.",
        "label": "Noncontrolling Interest [Member]",
        "terseLabel": "Non-controlling Interest [Member]"
       }
      }
     },
     "localname": "NoncontrollingInterestMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NondesignatedMember": {
     "auth_ref": [
      "r277"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Derivative instrument not designated as hedging instrument under Generally Accepted Accounting Principles (GAAP).",
        "label": "Nondesignated [Member]",
        "terseLabel": "Derivatives Not Designated as Hedging Instruments under ASC 815 [Member]"
       }
      }
     },
     "localname": "NondesignatedMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAssetsAndLiabilitiesMeasuredAndRecordedAtFairValueParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_NonoperatingIncomeExpense": {
     "auth_ref": [
      "r94"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10080.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).",
        "label": "Nonoperating Income Expense",
        "terseLabel": "Other income and (expense), net"
       }
      }
     },
     "localname": "NonoperatingIncomeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_NumberOfOperatingSegments": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.",
        "label": "Number Of Operating Segments",
        "terseLabel": "Number of operating segments"
       }
      }
     },
     "localname": "NumberOfOperatingSegments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_NumberOfReportableSegments": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.",
        "label": "Number Of Reportable Segments",
        "terseLabel": "Number of reportable segments"
       }
      }
     },
     "localname": "NumberOfReportableSegments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "integerItemType"
    },
    "us-gaap_OffsettingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Offsetting [Abstract]"
       }
      }
     },
     "localname": "OffsettingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingIncomeLoss": {
     "auth_ref": [],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10070.0,
       "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The net result for the period of deducting operating expenses from operating revenues.",
        "label": "Operating Income Loss",
        "totalLabel": "Operating profit"
       }
      }
     },
     "localname": "OperatingIncomeLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseCost": {
     "auth_ref": [
      "r332",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.",
        "label": "Operating Lease Cost",
        "terseLabel": "Operating lease expense"
       }
      }
     },
     "localname": "OperatingLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Operating Lease Liabilities Payments Due [Abstract]",
        "terseLabel": "Operating Leases"
       }
      }
     },
     "localname": "OperatingLeaseLiabilitiesPaymentsDueAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_OperatingLeaseLiability": {
     "auth_ref": [
      "r324"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail2": {
       "order": 10040.0,
       "parentTag": "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease.",
        "label": "Operating Lease Liability",
        "verboseLabel": "Present value of lease liabilities"
       }
      }
     },
     "localname": "OperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityCurrent": {
     "auth_ref": [
      "r324"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10010.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseLiabilities",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10220.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.",
        "label": "Operating Lease Liability Current",
        "positiveLabel": "Current portion of operating lease liabilities",
        "terseLabel": "Operating leases, current portion",
        "verboseLabel": "Operating lease liabilities, current"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfMaturityAnalysisOfLeaseLiabilitiesParentheticalDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseLiabilityNoncurrent": {
     "auth_ref": [
      "r324"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10030.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseLiabilities",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10150.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
        "label": "Operating Lease Liability Noncurrent",
        "terseLabel": "Noncurrent operating lease liabilities",
        "verboseLabel": "Operating lease liabilities, noncurrent"
       }
      }
     },
     "localname": "OperatingLeaseLiabilityNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeasePayments": {
     "auth_ref": [
      "r329",
      "r335"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.",
        "label": "Operating Lease Payments",
        "terseLabel": "Operating cash flows from operating leases"
       }
      }
     },
     "localname": "OperatingLeasePayments",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseRightOfUseAsset": {
     "auth_ref": [
      "r323"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail": {
       "order": 10050.0,
       "parentTag": "ryi_OperatingAndFinanceLeaseRightOfUseAsset",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10260.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of lessee's right to use underlying asset under operating lease.",
        "label": "Operating Lease Right Of Use Asset",
        "positiveLabel": "Operating lease assets",
        "terseLabel": "Operating lease assets"
       }
      }
     },
     "localname": "OperatingLeaseRightOfUseAsset",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent": {
     "auth_ref": [
      "r338",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average discount rate for operating lease calculated at point in time.",
        "label": "Operating Lease Weighted Average Discount Rate Percent",
        "terseLabel": "Operating leases, Weighted-average discount rate"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageDiscountRatePercent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1": {
     "auth_ref": [
      "r337",
      "r341"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Operating Lease Weighted Average Remaining Lease Term1",
        "terseLabel": "Operating leases, Weighted-average remaining lease term"
       }
      }
     },
     "localname": "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateForOperatingAndFinanceLeasesDetail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock": {
     "auth_ref": [
      "r4",
      "r273"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.",
        "label": "Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block]",
        "terseLabel": "Financial Statements"
       }
      }
     },
     "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureFinancialStatements"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_OtherAccruedLiabilitiesCurrent": {
     "auth_ref": [
      "r9",
      "r10",
      "r11",
      "r46"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10200.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.",
        "label": "Other Accrued Liabilities Current",
        "terseLabel": "Other accrued liabilities"
       }
      }
     },
     "localname": "OtherAccruedLiabilitiesCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherAssetsMember": {
     "auth_ref": [
      "r279",
      "r297"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other assets.",
        "label": "Other Assets [Member]",
        "terseLabel": "Deferred charges and other assets [Member]"
       }
      }
     },
     "localname": "OtherAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherBorrowings": {
     "auth_ref": [
      "r356"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": 10040.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.",
        "label": "Other Borrowings",
        "terseLabel": "Other debt"
       }
      }
     },
     "localname": "OtherBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax": {
     "auth_ref": [
      "r76",
      "r86"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax, before reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income Loss Before Reclassifications Net Of Tax",
        "terseLabel": "Other comprehensive income (loss) before reclassifications"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent": {
     "auth_ref": [
      "r73"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.",
        "label": "Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent",
        "terseLabel": "Cash flow hedge - interest rate swap, net of tax of $1.2 and $0.1"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent": {
     "auth_ref": [
      "r74"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.",
        "label": "Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Parent",
        "terseLabel": "Changes in interest rate swap, tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTaxParent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax": {
     "auth_ref": [
      "r67",
      "r317"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
        "label": "Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax",
        "terseLabel": "Foreign currency translation"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossNetOfTax": {
     "auth_ref": [
      "r81",
      "r84",
      "r86",
      "r192"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
        "label": "Other Comprehensive Income Loss Net Of Tax",
        "totalLabel": "Net current-period other comprehensive income (loss)"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax": {
     "auth_ref": [
      "r71",
      "r73"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.",
        "label": "Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax",
        "terseLabel": "Changes in defined benefit pension and other post-retirement benefit plans, net of tax of $0.6 and $0.3"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax": {
     "auth_ref": [
      "r71",
      "r74",
      "r262"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.",
        "label": "Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax",
        "terseLabel": "Changes in defined benefit pension and other post-retirement benefit plans, tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax": {
     "auth_ref": [
      "r73",
      "r77",
      "r78",
      "r287"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).",
        "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Before Tax",
        "negatedLabel": "Realized swap interest"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax": {
     "auth_ref": [
      "r73",
      "r77",
      "r78",
      "r278"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).",
        "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax",
        "negatedTotalLabel": "Net of tax"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax": {
     "auth_ref": [
      "r74"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).",
        "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Tax",
        "terseLabel": "Tax benefit"
       }
      }
     },
     "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherCurrentLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other current liabilities.",
        "label": "Other Current Liabilities [Member]",
        "terseLabel": "Other Accrued Liabilities [Member]"
       }
      }
     },
     "localname": "OtherCurrentLiabilitiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment": {
     "auth_ref": [
      "r32"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller.",
        "label": "Other Inventory Materials Supplies And Merchandise Under Consignment",
        "terseLabel": "Consignment inventory"
       }
      }
     },
     "localname": "OtherInventoryMaterialsSuppliesAndMerchandiseUnderConsignment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherLiabilitiesNoncurrent": {
     "auth_ref": [
      "r50"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10170.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.",
        "label": "Other Liabilities Noncurrent",
        "terseLabel": "Other noncurrent liabilities"
       }
      }
     },
     "localname": "OtherLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoncashIncomeExpense": {
     "auth_ref": [
      "r109"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10230.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.",
        "label": "Other Noncash Income Expense",
        "negatedLabel": "Other items"
       }
      }
     },
     "localname": "OtherNoncashIncomeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_OtherNoncurrentLiabilitiesMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other noncurrent liabilities.",
        "label": "Other Noncurrent Liabilities [Member]",
        "terseLabel": "Other Noncurrent Liabilities [Member]"
       }
      }
     },
     "localname": "OtherNoncurrentLiabilitiesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherNonoperatingIncomeExpenseMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing other nonoperating income (expense).",
        "label": "Other Nonoperating Income Expense [Member]",
        "verboseLabel": "Other Income and (Expense), Net [Member]"
       }
      }
     },
     "localname": "OtherNonoperatingIncomeExpenseMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebt2022NotesAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember": {
     "auth_ref": [
      "r216",
      "r232",
      "r233",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.",
        "label": "Other Postretirement Benefit Plans Defined Benefit [Member]",
        "terseLabel": "Other Benefits [Member]"
       }
      }
     },
     "localname": "OtherPostretirementBenefitPlansDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_OtherShortTermBorrowings": {
     "auth_ref": [
      "r41"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail2": {
       "order": 10030.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.",
        "label": "Other Short Term Borrowings",
        "terseLabel": "Less: Other short-term debt"
       }
      }
     },
     "localname": "OtherShortTermBorrowings",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities": {
     "auth_ref": [
      "r100"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10100.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.",
        "label": "Payment For Contingent Consideration Liability Financing Activities",
        "negatedLabel": "Contingent payment related to acquisition"
       }
      }
     },
     "localname": "PaymentForContingentConsiderationLiabilityFinancingActivities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": {
     "auth_ref": [
      "r97"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10110.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
        "label": "Payments To Acquire Property Plant And Equipment",
        "negatedLabel": "Capital expenditures"
       }
      }
     },
     "localname": "PaymentsToAcquirePropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock": {
     "auth_ref": [
      "r245"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for pension and other postretirement benefits.",
        "label": "Pension And Other Postretirement Benefits Disclosure [Text Block]",
        "terseLabel": "Employee Benefits"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefits"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities": {
     "auth_ref": [
      "r19",
      "r217",
      "r218",
      "r221"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10230.0,
       "parentTag": "us-gaap_LiabilitiesCurrent",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.",
        "label": "Pension And Other Postretirement Defined Benefit Plans Current Liabilities",
        "terseLabel": "Current portion of deferred employee benefits"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent": {
     "auth_ref": [
      "r21",
      "r217",
      "r218",
      "r221"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10140.0,
       "parentTag": "us-gaap_Liabilities",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.",
        "label": "Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent",
        "terseLabel": "Deferred employee benefits"
       }
      }
     },
     "localname": "PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionContributions": {
     "auth_ref": [
      "r105"
     ],
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.",
        "label": "Pension Contributions",
        "terseLabel": "Contribution to the pension plan fund"
       }
      }
     },
     "localname": "PensionContributions",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionExpenseReversalOfExpenseNoncash": {
     "auth_ref": [
      "r108"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10200.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncash expense (reversal of expense) for pension benefits. Excludes other postretirement benefits.",
        "label": "Pension Expense Reversal Of Expense Noncash",
        "terseLabel": "Pension settlement charge"
       }
      }
     },
     "localname": "PensionExpenseReversalOfExpenseNoncash",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PensionPlansDefinedBenefitMember": {
     "auth_ref": [
      "r215",
      "r232",
      "r233",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits.",
        "label": "Pension Plans Defined Benefit [Member]",
        "terseLabel": "Pension Benefits [Member]"
       }
      }
     },
     "localname": "PensionPlansDefinedBenefitMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PercentageOfLIFOInventory": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.",
        "label": "Percentage Of L I F O Inventory",
        "terseLabel": "Inventories accounted under the LIFO method"
       }
      }
     },
     "localname": "PercentageOfLIFOInventory",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesAdditionalInformationDetail"
     ],
     "xbrltype": "percentItemType"
    },
    "us-gaap_PortionAtFairValueFairValueDisclosureMember": {
     "auth_ref": [
      "r312"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Measured at fair value for financial reporting purposes.",
        "label": "Portion At Fair Value Fair Value Disclosure [Member]",
        "terseLabel": "Fair Value Disclosure Item Amounts [Default]"
       }
      }
     },
     "localname": "PortionAtFairValueFairValueDisclosureMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PreferredStockParOrStatedValuePerShare": {
     "auth_ref": [
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
        "label": "Preferred Stock Par Or Stated Value Per Share",
        "terseLabel": "Preferred stock, par value"
       }
      }
     },
     "localname": "PreferredStockParOrStatedValuePerShare",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "perShareItemType"
    },
    "us-gaap_PreferredStockSharesAuthorized": {
     "auth_ref": [
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
        "label": "Preferred Stock Shares Authorized",
        "terseLabel": "Preferred stock, shares authorized"
       }
      }
     },
     "localname": "PreferredStockSharesAuthorized",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockSharesIssued": {
     "auth_ref": [
      "r22"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.",
        "label": "Preferred Stock Shares Issued",
        "terseLabel": "Preferred stock, shares issued"
       }
      }
     },
     "localname": "PreferredStockSharesIssued",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_PreferredStockValue": {
     "auth_ref": [
      "r22"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10060.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
        "label": "Preferred Stock Value",
        "terseLabel": "Preferred stock, value"
       }
      }
     },
     "localname": "PreferredStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": {
     "auth_ref": [
      "r7",
      "r35",
      "r36"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10360.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.",
        "label": "Prepaid Expense And Other Assets Current",
        "terseLabel": "Prepaid expenses and other current assets"
       }
      }
     },
     "localname": "PrepaidExpenseAndOtherAssetsCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpenseAndOtherAssetsNoncurrent": {
     "auth_ref": [
      "r16",
      "r349",
      "r365"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10290.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed after one year or the normal operating cycle, if longer.",
        "label": "Prepaid Expense And Other Assets Noncurrent",
        "terseLabel": "Deferred charges and other assets"
       }
      }
     },
     "localname": "PrepaidExpenseAndOtherAssetsNoncurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing prepaid expenses and other current assets.",
        "label": "Prepaid Expenses And Other Current Assets [Member]",
        "terseLabel": "Prepaid Expenses and Other Current Assets [Member]"
       }
      }
     },
     "localname": "PrepaidExpensesAndOtherCurrentAssetsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndFairValueAmountOfDerivativeInstrumentsDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ProceedsFromLinesOfCredit": {
     "auth_ref": [
      "r98",
      "r120"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.",
        "label": "Proceeds From Lines Of Credit",
        "terseLabel": "Proceeds from credit facility"
       }
      }
     },
     "localname": "ProceedsFromLinesOfCredit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess": {
     "auth_ref": [
      "r98",
      "r99",
      "r111"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10070.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.",
        "label": "Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less",
        "terseLabel": "Net proceeds of short-term borrowings"
       }
      }
     },
     "localname": "ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment": {
     "auth_ref": [
      "r96"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10120.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.",
        "label": "Proceeds From Sale Of Property Plant And Equipment",
        "terseLabel": "Proceeds from sale of property, plant, and equipment"
       }
      }
     },
     "localname": "ProceedsFromSaleOfPropertyPlantAndEquipment",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ProductInformationLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Product Information [Line Items]",
        "terseLabel": "Product Line"
       }
      }
     },
     "localname": "ProductInformationLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ProfitLoss": {
     "auth_ref": [
      "r80",
      "r83",
      "r102",
      "r135",
      "r136",
      "r262",
      "r265",
      "r267",
      "r271",
      "r272"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10130.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10030.0,
       "parentTag": "us-gaap_NetIncomeLoss",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
        "label": "Profit Loss",
        "terseLabel": "Net income",
        "totalLabel": "Net income",
        "verboseLabel": "Net income"
       }
      }
     },
     "localname": "ProfitLoss",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentByTypeAxis": {
     "auth_ref": [
      "r39",
      "r170"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.",
        "label": "Property Plant And Equipment By Type [Axis]",
        "terseLabel": "Property, Plant and Equipment, Type"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentByTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentGross": {
     "auth_ref": [
      "r38",
      "r168"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10300.0,
       "parentTag": "us-gaap_PropertyPlantAndEquipmentNet",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property Plant And Equipment Gross",
        "terseLabel": "Property, plant, and equipment, at cost"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentGross",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property Plant And Equipment [Member]",
        "terseLabel": "Property Plant and Equipment [Member]"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentNet": {
     "auth_ref": [
      "r14",
      "r15",
      "r170",
      "r372"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10250.0,
       "parentTag": "us-gaap_Assets",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
        "label": "Property Plant And Equipment Net",
        "totalLabel": "Property, plant, and equipment, net"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentNet",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_PropertyPlantAndEquipmentTypeDomain": {
     "auth_ref": [
      "r14",
      "r168"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.",
        "label": "Property Plant And Equipment Type [Domain]",
        "terseLabel": "Property, Plant and Equipment, Type"
       }
      }
     },
     "localname": "PropertyPlantAndEquipmentTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseAssetsAndLeaseLiabilitiesParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_ProvisionForDoubtfulAccounts": {
     "auth_ref": [
      "r90",
      "r146"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
        "label": "Provision For Doubtful Accounts",
        "terseLabel": "Current period provision"
       }
      }
     },
     "localname": "ProvisionForDoubtfulAccounts",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureProvisionForCreditLossesScheduleOfReconciliationOfProvisionForCreditLossesDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReceivablesFairValueDisclosure": {
     "auth_ref": [
      "r31",
      "r58",
      "r355",
      "r371"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.",
        "label": "Receivables Fair Value Disclosure",
        "terseLabel": "Receivables less provisions"
       }
      }
     },
     "localname": "ReceivablesFairValueDisclosure",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsCarryingAndEstimatedFairValuesFinancialInstrumentsDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReceivablesNetCurrent": {
     "auth_ref": [
      "r24",
      "r31",
      "r371",
      "r381"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10340.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.",
        "label": "Receivables Net Current",
        "terseLabel": "Receivables less provisions of $3.5 in 2020 and 2019"
       }
      }
     },
     "localname": "ReceivablesNetCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]",
        "terseLabel": "Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]"
       }
      }
     },
     "localname": "ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax": {
     "auth_ref": [
      "r76",
      "r79"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": 10030.0,
       "parentTag": "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount before tax of reclassification adjustments of other comprehensive income (loss).",
        "label": "Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax",
        "terseLabel": "Reclassifications out of AOCI"
       }
      }
     },
     "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax": {
     "auth_ref": [
      "r76",
      "r79",
      "r86"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
       "weight": -1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss).",
        "label": "Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax",
        "negatedLabel": "Amounts reclassified from accumulated other comprehensive income into net income",
        "totalLabel": "Net of tax"
       }
      }
     },
     "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationFromAociCurrentPeriodTax": {
     "auth_ref": [
      "r74",
      "r78",
      "r257"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail": {
       "order": 10040.0,
       "parentTag": "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).",
        "label": "Reclassification From Aoci Current Period Tax",
        "negatedLabel": "Tax provision"
       }
      }
     },
     "localname": "ReclassificationFromAociCurrentPeriodTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about items reclassified out of accumulated other comprehensive income (loss).",
        "label": "Reclassification Out Of Accumulated Other Comprehensive Income [Table]",
        "terseLabel": "Reclassification Out Of Accumulated Other Comprehensive Income [Table]"
       }
      }
     },
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).",
        "label": "Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block]",
        "terseLabel": "Reclassifications Out of Accumulated Other Comprehensive Income (Loss)"
       }
      }
     },
     "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RepaymentsOfLongTermDebt": {
     "auth_ref": [
      "r99"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10060.0,
       "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities",
       "weight": -1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.",
        "label": "Repayments Of Long Term Debt",
        "negatedLabel": "Repayment of debt"
       }
      }
     },
     "localname": "RepaymentsOfLongTermDebt",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis": {
     "auth_ref": [
      "r37"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by category of cash or cash equivalent items which are restricted as to withdrawal or usage.",
        "label": "Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Axis]",
        "terseLabel": "Restricted Cash and Cash Equivalents"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of cash and cash equivalent. Cash is currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
        "label": "Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member]",
        "terseLabel": "Cash and Cash Equivalents"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Restricted Cash And Cash Equivalents Items [Line Items]",
        "terseLabel": "Restricted Cash And Cash Equivalents Items [Line Items]"
       }
      }
     },
     "localname": "RestrictedCashAndCashEquivalentsItemsLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RestrictedCashCurrent": {
     "auth_ref": [
      "r5",
      "r13",
      "r115"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10330.0,
       "parentTag": "us-gaap_AssetsCurrent",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.",
        "label": "Restricted Cash Current",
        "terseLabel": "Restricted cash",
        "verboseLabel": "Restricted cash"
       }
      }
     },
     "localname": "RestrictedCashCurrent",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashReconciliationOfCashCashEquivalentsAndRestrictedCashDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RestructuringCharges": {
     "auth_ref": [
      "r108",
      "r173",
      "r174",
      "r175"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10190.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      },
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10120.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.",
        "label": "Restructuring Charges",
        "terseLabel": "Restructuring and other charges"
       }
      }
     },
     "localname": "RestructuringCharges",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsAccumulatedDeficit": {
     "auth_ref": [
      "r26",
      "r197",
      "r368"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10090.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings Accumulated Deficit",
        "terseLabel": "Retained earnings"
       }
      }
     },
     "localname": "RetainedEarningsAccumulatedDeficit",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RetainedEarningsMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
        "label": "Retained Earnings [Member]",
        "terseLabel": "Retained Earnings (Accumulated Deficit) [Member]"
       }
      }
     },
     "localname": "RetainedEarningsMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RetirementPlanTypeAxis": {
     "auth_ref": [
      "r215",
      "r216",
      "r232",
      "r233",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.",
        "label": "Retirement Plan Type [Axis]",
        "terseLabel": "Retirement Plan Type"
       }
      }
     },
     "localname": "RetirementPlanTypeAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RetirementPlanTypeDomain": {
     "auth_ref": [
      "r215",
      "r216",
      "r232",
      "r233",
      "r244"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.",
        "label": "Retirement Plan Type [Domain]",
        "terseLabel": "Retirement Plan Type"
       }
      }
     },
     "localname": "RetirementPlanTypeDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsComponentsOfNetPeriodicBenefitCostCreditDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenue From Contract With Customer [Abstract]"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax": {
     "auth_ref": [
      "r208",
      "r209"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10130.0,
       "parentTag": "us-gaap_GrossProfit",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.",
        "label": "Revenue From Contract With Customer Excluding Assessed Tax",
        "terseLabel": "Net sales"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerExcludingAssessedTax",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfConsolidatedFinancialInformationOfOurOperationsByGeographicLocationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RevenueFromContractWithCustomerTextBlock": {
     "auth_ref": [
      "r214"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.",
        "label": "Revenue From Contract With Customer [Text Block]",
        "terseLabel": "Revenue Recognition"
       }
      }
     },
     "localname": "RevenueFromContractWithCustomerTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognition"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Revenue Initial Application Period Cumulative Effect Transition [Line Items]",
        "terseLabel": "Revenue Initial Application Period Cumulative Effect Transition [Line Items]"
       }
      }
     },
     "localname": "RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information when using transition method for cumulative effect in initial period of application for revenue from contract with customer.",
        "label": "Revenue Initial Application Period Cumulative Effect Transition [Table]",
        "terseLabel": "Revenue Initial Application Period Cumulative Effect Transition [Table]"
       }
      }
     },
     "localname": "RevenueInitialApplicationPeriodCumulativeEffectTransitionTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenuePerformanceObligationDescriptionOfPaymentTerms": {
     "auth_ref": [
      "r206"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Description of payment terms in contract with customer. Includes, but is not limited to, timing of payment, existence of financing component, variability of consideration and constraint on variable consideration.",
        "label": "Revenue Performance Obligation Description Of Payment Terms",
        "terseLabel": "Payment terms on invoiced amounts"
       }
      }
     },
     "localname": "RevenuePerformanceObligationDescriptionOfPaymentTerms",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRecognitionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Revenue Recognition [Abstract]"
       }
      }
     },
     "localname": "RevenueRecognitionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1": {
     "auth_ref": [
      "r207"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
        "label": "Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1",
        "terseLabel": "Performance obligations on contracts have expected duration"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail"
     ],
     "xbrltype": "durationItemType"
    },
    "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis": {
     "auth_ref": [
      "r207"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Start date of time band for expected timing of satisfaction of remaining performance obligation, in CCYY-MM-DD format.",
        "label": "Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis]",
        "terseLabel": "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date"
       }
      }
     },
     "localname": "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformation1Detail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_RevolvingCreditFacilityMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.",
        "label": "Revolving Credit Facility [Member]",
        "terseLabel": "Ryerson Credit Facility [Member]"
       }
      }
     },
     "localname": "RevolvingCreditFacilityMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtAdditionalInformationDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability": {
     "auth_ref": [
      "r336",
      "r341"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for finance lease liability.",
        "label": "Right Of Use Asset Obtained In Exchange For Finance Lease Liability",
        "terseLabel": "Finance leases",
        "verboseLabel": "Asset additions under finance leases and sale-leasebacks"
       }
      }
     },
     "localname": "RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability": {
     "auth_ref": [
      "r336",
      "r341"
     ],
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.",
        "label": "Right Of Use Asset Obtained In Exchange For Operating Lease Liability",
        "terseLabel": "Operating leases",
        "verboseLabel": "Asset additions under operating leases"
       }
      }
     },
     "localname": "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock": {
     "auth_ref": [
      "r76"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of accumulated other comprehensive income (loss).",
        "label": "Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block]",
        "terseLabel": "Changes in Accumulated Other Comprehensive Income/(Loss) Net of Tax by Component"
       }
      }
     },
     "localname": "ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfCashFlowHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock": {
     "auth_ref": [
      "r286"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure for cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position.",
        "label": "Schedule Of Cash Flow Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block]",
        "terseLabel": "Location and Amount of Gains and Losses on Derivatives Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income"
       }
      }
     },
     "localname": "ScheduleOfCashFlowHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDebtTableTextBlock": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.",
        "label": "Schedule Of Debt Table [Text Block]",
        "terseLabel": "Long-Term Debt"
       }
      }
     },
     "localname": "ScheduleOfDebtTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock": {
     "auth_ref": [
      "r285"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.",
        "label": "Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Text Block]",
        "terseLabel": "Location and Fair Value Amount of Derivative Instruments"
       }
      }
     },
     "localname": "ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": {
     "auth_ref": [
      "r131"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
        "label": "Schedule Of Earnings Per Share Basic And Diluted Table [Text Block]",
        "terseLabel": "Calculation of Basic and Diluted Earnings Per Share"
       }
      }
     },
     "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock": {
     "auth_ref": [
      "r300",
      "r301"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
        "label": "Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block]",
        "terseLabel": "Assets and Liabilities Measured and Recorded at Fair Value"
       }
      }
     },
     "localname": "ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfInventoryCurrentTableTextBlock": {
     "auth_ref": [
      "r12",
      "r32",
      "r33",
      "r34"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.",
        "label": "Schedule Of Inventory Current Table [Text Block]",
        "terseLabel": "Schedule of Inventories"
       }
      }
     },
     "localname": "ScheduleOfInventoryCurrentTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureInventoriesTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": {
     "auth_ref": [
      "r224"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.",
        "label": "Schedule Of Net Benefit Costs Table [Text Block]",
        "terseLabel": "Components of Net Periodic Benefit Cost (Credit)"
       }
      }
     },
     "localname": "ScheduleOfNetBenefitCostsTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEmployeeBenefitsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock": {
     "auth_ref": [
      "r288",
      "r290"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of derivative instrument not designated or qualifying as hedging instrument.",
        "label": "Schedule Of Other Derivatives Not Designated As Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block]",
        "terseLabel": "Location and Amount of Gains and Losses on Derivatives Not Designated as Hedging Instruments Reported in Condensed Consolidated Statements of Comprehensive Income"
       }
      }
     },
     "localname": "ScheduleOfOtherDerivativesNotDesignatedAsHedgingInstrumentsStatementsOfFinancialPerformanceAndFinancialPositionLocationTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfProductInformationTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule detailing quantitative information concerning products or product lines by product or product line.",
        "label": "Schedule Of Product Information [Table]",
        "terseLabel": "Schedule Of Product Information [Table]"
       }
      }
     },
     "localname": "ScheduleOfProductInformationTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionPercentageOfSalesByMajorProductLinesDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable": {
     "auth_ref": [
      "r13",
      "r115",
      "r348",
      "r367"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Disclosure of information about cash and cash equivalents restricted as to withdrawal or usage.",
        "label": "Schedule Of Restricted Cash And Cash Equivalents [Table]",
        "terseLabel": "Schedule Of Restricted Cash And Cash Equivalents [Table]"
       }
      }
     },
     "localname": "ScheduleOfRestrictedCashAndCashEquivalentsTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTextBlock": {
     "auth_ref": [
      "r13",
      "r115",
      "r348",
      "r367"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage.",
        "label": "Schedule Of Restricted Cash And Cash Equivalents [Text Block]",
        "terseLabel": "Reconciliation of Cash, Cash Equivalents, and Restricted Cash"
       }
      }
     },
     "localname": "ScheduleOfRestrictedCashAndCashEquivalentsTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureCashCashEquivalentsAndRestrictedCashTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_ScheduleOfStockholdersEquityTableTextBlock": {
     "auth_ref": [
      "r192"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.",
        "label": "Schedule Of Stockholders Equity Table [Text Block]",
        "terseLabel": "Change in Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest"
       }
      }
     },
     "localname": "ScheduleOfStockholdersEquityTableTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestTables"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpense": {
     "auth_ref": [
      "r93",
      "r156"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited": {
       "order": 10110.0,
       "parentTag": "us-gaap_OperatingIncomeLoss",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.",
        "label": "Selling General And Administrative Expense",
        "terseLabel": "Warehousing, delivery, selling, general, and administrative"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_SellingGeneralAndAdministrativeExpensesMember": {
     "auth_ref": [
      "r95"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Primary financial statement caption encompassing selling, general and administrative expense.",
        "label": "Selling General And Administrative Expenses [Member]",
        "terseLabel": "Warehousing, Delivery, Selling, General, and Administrative [Member]"
       }
      }
     },
     "localname": "SellingGeneralAndAdministrativeExpensesMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureDerivativesAndFairValueMeasurementsLocationAndAmountOfGainsAndLossesOnDerivativesNotDesignatedAsHedgingInstrumentsReportedInCondensedConsolidatedStatementsOfComprehensiveIncomeDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_SeniorNotes": {
     "auth_ref": [
      "r357",
      "r374"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": 10020.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.",
        "label": "Senior Notes",
        "terseLabel": "11.00% Senior Secured Notes due 2022"
       }
      }
     },
     "localname": "SeniorNotes",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShareBasedCompensation": {
     "auth_ref": [
      "r107"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited": {
       "order": 10160.0,
       "parentTag": "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of noncash expense for share-based payment arrangement.",
        "label": "Share Based Compensation",
        "terseLabel": "Stock-based compensation"
       }
      }
     },
     "localname": "ShareBasedCompensation",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_ShortTermLeaseCost": {
     "auth_ref": [
      "r333",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": 10050.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of short-term lease cost, excluding expense for lease with term of one month or less.",
        "label": "Short Term Lease Cost",
        "terseLabel": "Short-term lease expense"
       }
      }
     },
     "localname": "ShortTermLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StatementEquityComponentsAxis": {
     "auth_ref": [
      "r53",
      "r192"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by component of equity.",
        "label": "Statement Equity Components [Axis]",
        "terseLabel": "Equity Components"
       }
      }
     },
     "localname": "StatementEquityComponentsAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangesInAccumulatedOtherComprehensiveIncomeLossNetOfTaxByComponentDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementLineItems": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
        "label": "Statement [Line Items]",
        "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]"
       }
      }
     },
     "localname": "StatementLineItems",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfCashFlowsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement Of Cash Flows [Abstract]"
       }
      }
     },
     "localname": "StatementOfCashFlowsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfFinancialPositionAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement Of Financial Position [Abstract]"
       }
      }
     },
     "localname": "StatementOfFinancialPositionAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement Of Income And Comprehensive Income [Abstract]"
       }
      }
     },
     "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementOfStockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Statement Of Stockholders Equity [Abstract]"
       }
      }
     },
     "localname": "StatementOfStockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "xbrltype": "stringItemType"
    },
    "us-gaap_StatementTable": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
        "label": "Statement [Table]",
        "terseLabel": "Statement [Table]"
       }
      }
     },
     "localname": "StatementTable",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan": {
     "auth_ref": [
      "r22",
      "r23",
      "r192",
      "r197",
      "r250"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.",
        "label": "Stock Issued During Period Shares Employee Stock Ownership Plan",
        "terseLabel": "Stock-based compensation expense, shares"
       }
      }
     },
     "localname": "StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_StockholdersEquity": {
     "auth_ref": [
      "r23",
      "r27",
      "r28",
      "r142"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10040.0,
       "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.",
        "label": "Stockholders Equity",
        "totalLabel": "Total Ryerson Holding Corporation stockholders\u2019 equity"
       }
      }
     },
     "localname": "StockholdersEquity",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders Equity [Abstract]",
        "terseLabel": "Ryerson Holding Corporation stockholders\u2019 equity:"
       }
      }
     },
     "localname": "StockholdersEquityAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": {
     "auth_ref": [
      "r260",
      "r261",
      "r270"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10030.0,
       "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity",
       "weight": 1.0
      }
     },
     "crdr": "credit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.",
        "label": "Stockholders Equity Including Portion Attributable To Noncontrolling Interest",
        "periodEndLabel": "Ending Balance",
        "periodStartLabel": "Beginning Balance",
        "totalLabel": "Total equity"
       }
      }
     },
     "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract]",
        "terseLabel": "Equity"
       }
      }
     },
     "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_StockholdersEquityNoteDisclosureTextBlock": {
     "auth_ref": [
      "r200"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.",
        "label": "Stockholders Equity Note Disclosure [Text Block]",
        "terseLabel": "Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest"
       }
      }
     },
     "localname": "StockholdersEquityNoteDisclosureTextBlock",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterest"
     ],
     "xbrltype": "textBlockItemType"
    },
    "us-gaap_SupplementalCashFlowElementsAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental Cash Flow Elements [Abstract]",
        "terseLabel": "Cash paid during the period for:"
       }
      }
     },
     "localname": "SupplementalCashFlowElementsAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_SupplementalCashFlowInformationAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Supplemental Cash Flow Information [Abstract]",
        "terseLabel": "Supplemental disclosures:"
       }
      }
     },
     "localname": "SupplementalCashFlowInformationAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedStatementsOfCashFlowsUnaudited"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TimingOfTransferOfGoodOrServiceAxis": {
     "auth_ref": [
      "r213"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by timing of transfer of good or service to customer.",
        "label": "Timing Of Transfer Of Good Or Service [Axis]",
        "terseLabel": "Timing of Transfer of Good or Service"
       }
      }
     },
     "localname": "TimingOfTransferOfGoodOrServiceAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_TimingOfTransferOfGoodOrServiceDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Timing of transfer of good or service to customer. Includes, but is not limited to, at point in time or over time.",
        "label": "Timing Of Transfer Of Good Or Service [Domain]",
        "terseLabel": "Timing of Transfer of Good or Service"
       }
      }
     },
     "localname": "TimingOfTransferOfGoodOrServiceDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TransferredAtPointInTimeMember": {
     "auth_ref": [
      "r213"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract with customer in which good or service is transferred at point in time.",
        "label": "Transferred At Point In Time [Member]",
        "terseLabel": "Revenue Recognized Point In Time"
       }
      }
     },
     "localname": "TransferredAtPointInTimeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TransferredOverTimeMember": {
     "auth_ref": [
      "r213"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Contract with customer in which good or service is transferred over time.",
        "label": "Transferred Over Time [Member]",
        "terseLabel": "Revenue Recognized Over Time"
       }
      }
     },
     "localname": "TransferredOverTimeMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureRevenueRecognitionSummaryOfRevenuesByTypeOfItemSoldDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockMember": {
     "auth_ref": [
      "r52",
      "r198"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.",
        "label": "Treasury Stock [Member]",
        "terseLabel": "Treasury Stock [Member]"
       }
      }
     },
     "localname": "TreasuryStockMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_TreasuryStockShares": {
     "auth_ref": [
      "r52",
      "r198"
     ],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.",
        "label": "Treasury Stock Shares",
        "periodEndLabel": "Ending Balance Treasury Stock, shares",
        "periodStartLabel": "Beginning Balance Treasury Stock, shares",
        "terseLabel": "Treasury stock at cost - Common stock, shares"
       }
      }
     },
     "localname": "TreasuryStockShares",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsParenthetical"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_TreasuryStockValue": {
     "auth_ref": [
      "r52",
      "r198",
      "r199"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets": {
       "order": 10100.0,
       "parentTag": "us-gaap_StockholdersEquity",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.",
        "label": "Treasury Stock Value",
        "negatedLabel": "Treasury stock at cost - Common stock, value"
       }
      }
     },
     "localname": "TreasuryStockValue",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/StatementCondensedConsolidatedBalanceSheets"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_TypeOfAdoptionMember": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.",
        "label": "Type Of Adoption [Member]",
        "terseLabel": "Type of Adoption"
       }
      }
     },
     "localname": "TypeOfAdoptionMember",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesScheduleOfInformationReportedInCondensedConsolidatedStatementOfCashFlowsDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitDetail",
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureStockholdersEquityDeficitAccumulatedOtherComprehensiveIncomeLossAndNoncontrollingInterestChangeInStockholdersEquityDeficitParentheticalDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_UnamortizedDebtIssuanceExpense": {
     "auth_ref": [
      "r40"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail": {
       "order": 10050.0,
       "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount",
       "weight": -1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.",
        "label": "Unamortized Debt Issuance Expense",
        "negatedLabel": "Unamortized debt issuance costs and discounts"
       }
      }
     },
     "localname": "UnamortizedDebtIssuanceExpense",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtLongTermDebtDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableLeaseCost": {
     "auth_ref": [
      "r334",
      "r341"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail": {
       "order": 10040.0,
       "parentTag": "us-gaap_LeaseCost",
       "weight": 1.0
      }
     },
     "crdr": "debit",
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.",
        "label": "Variable Lease Cost",
        "terseLabel": "Variable lease expense"
       }
      }
     },
     "localname": "VariableLeaseCost",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLeasesSummaryOfLocationAndAmountOfLeaseExpenseDetail"
     ],
     "xbrltype": "monetaryItemType"
    },
    "us-gaap_VariableRateAxis": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Information by type of variable rate.",
        "label": "Variable Rate [Axis]",
        "terseLabel": "Variable Rate"
       }
      }
     },
     "localname": "VariableRateAxis",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_VariableRateDomain": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
        "label": "Variable Rate [Domain]",
        "terseLabel": "Variable Rate"
       }
      }
     },
     "localname": "VariableRateDomain",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureLongTermDebtRyersonCreditFacilityAdditionalInformationDetail"
     ],
     "xbrltype": "domainItemType"
    },
    "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": {
     "auth_ref": [
      "r125",
      "r130"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail": {
       "order": null,
       "parentTag": null,
       "root": true,
       "weight": null
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
        "label": "Weighted Average Number Of Diluted Shares Outstanding",
        "totalLabel": "Weighted average shares outstanding adjusted for dilutive securities"
       }
      }
     },
     "localname": "WeightedAverageNumberOfDilutedSharesOutstanding",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "sharesItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract": {
     "auth_ref": [],
     "lang": {
      "en-US": {
       "role": {
        "label": "Weighted Average Number Of Shares Outstanding [Abstract]",
        "terseLabel": "Denominator:"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingAbstract",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "stringItemType"
    },
    "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": {
     "auth_ref": [
      "r124",
      "r130"
     ],
     "calculation": {
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail": {
       "order": 10010.0,
       "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
       "weight": 1.0
      }
     },
     "lang": {
      "en-US": {
       "role": {
        "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
        "label": "Weighted Average Number Of Shares Outstanding Basic",
        "terseLabel": "Weighted average shares outstanding"
       }
      }
     },
     "localname": "WeightedAverageNumberOfSharesOutstandingBasic",
     "nsuri": "http://fasb.org/us-gaap/2019-01-31",
     "presentation": [
      "http://www.ryerson.com/20200331/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicAndDilutedEarningsPerShareDetail"
     ],
     "xbrltype": "sharesItemType"
    }
   },
   "unitCount": 9
  }
 },
 "std_ref": {
  "r0": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759"
  },
  "r1": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759"
  },
  "r10": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765"
  },
  "r100": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  },
  "r101": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585"
  },
  "r102": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585"
  },
  "r103": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "24",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
  },
  "r104": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r105": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(g)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r106": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "25",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
  },
  "r107": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r108": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r109": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
  },
  "r11": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e7018-107765"
  },
  "r110": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
  },
  "r111": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3098-108585"
  },
  "r112": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586"
  },
  "r113": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586"
  },
  "r114": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586"
  },
  "r115": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
  },
  "r116": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(b))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r117": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(h))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r118": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08(m)(1)(iii))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r119": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(e),(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r12": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766"
  },
  "r120": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.4-08.(f))",
   "Topic": "235",
   "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
  },
  "r121": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
  },
  "r122": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "250",
   "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
  },
  "r123": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "250",
   "URI": "http://asc.fasb.org/topic&trid=2122394"
  },
  "r124": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256"
  },
  "r125": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256"
  },
  "r126": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256"
  },
  "r127": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "28A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256"
  },
  "r128": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "60B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256"
  },
  "r129": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256"
  },
  "r13": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r130": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r131": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
  },
  "r132": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "52",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "260",
   "URI": "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258"
  },
  "r133": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "260",
   "URI": "http://asc.fasb.org/topic&trid=2144383"
  },
  "r134": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r135": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "22",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
  },
  "r136": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "32",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
  },
  "r137": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "40",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599"
  },
  "r138": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "41",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "280",
   "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599"
  },
  "r139": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522"
  },
  "r14": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(13))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r140": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522"
  },
  "r141": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524"
  },
  "r142": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 4.E)",
   "Topic": "310",
   "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
  },
  "r143": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446"
  },
  "r144": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447"
  },
  "r145": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r146": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r147": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r148": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(f)",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r149": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
  },
  "r15": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(14))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r150": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919269-210447"
  },
  "r151": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919272-210447"
  },
  "r152": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
  },
  "r153": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919236-210447"
  },
  "r154": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
  },
  "r155": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "326",
   "URI": "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455"
  },
  "r156": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "30",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311"
  },
  "r157": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "330",
   "URI": "http://asc.fasb.org/extlink&oid=116846819&loc=d3e3927-108312"
  },
  "r158": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "330",
   "URI": "http://asc.fasb.org/topic&trid=2126998"
  },
  "r159": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266"
  },
  "r16": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(17))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r160": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266"
  },
  "r161": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975"
  },
  "r162": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
  },
  "r163": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
  },
  "r164": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(a)(1)",
   "Topic": "350",
   "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
  },
  "r165": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "350",
   "URI": "http://asc.fasb.org/topic&trid=2144416"
  },
  "r166": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2473-110228"
  },
  "r167": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r168": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r169": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r17": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19)(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r170": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
  },
  "r171": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r172": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "360",
   "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
  },
  "r173": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
  },
  "r174": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.3)",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747"
  },
  "r175": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 5.P.4(b))",
   "Topic": "420",
   "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
  },
  "r176": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "440",
   "URI": "http://asc.fasb.org/topic&trid=2144648"
  },
  "r177": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
  },
  "r178": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14615-108349"
  },
  "r179": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14394-108349"
  },
  "r18": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(19))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r180": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
  },
  "r181": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
  },
  "r182": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14453-108349"
  },
  "r183": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14472-108349"
  },
  "r184": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349"
  },
  "r185": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "450",
   "URI": "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349"
  },
  "r186": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "450",
   "URI": "http://asc.fasb.org/topic&trid=2127136"
  },
  "r187": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248"
  },
  "r188": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "460",
   "URI": "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248"
  },
  "r189": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "40",
   "SubTopic": "50",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629"
  },
  "r19": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(20))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r190": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "40",
   "SubTopic": "50",
   "Topic": "470",
   "URI": "http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629"
  },
  "r191": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "470",
   "URI": "http://asc.fasb.org/topic&trid=2208564"
  },
  "r192": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
  },
  "r193": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
  },
  "r194": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
  },
  "r195": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
  },
  "r196": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
  },
  "r197": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.3-04)",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770"
  },
  "r198": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
  },
  "r199": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Topic": "505",
   "URI": "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
  },
  "r2": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
  },
  "r20": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(22))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r200": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "505",
   "URI": "http://asc.fasb.org/topic&trid=2208762"
  },
  "r201": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044"
  },
  "r202": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044"
  },
  "r203": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044"
  },
  "r204": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045"
  },
  "r205": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045"
  },
  "r206": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130554-203045"
  },
  "r207": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045"
  },
  "r208": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045"
  },
  "r209": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045"
  },
  "r21": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(24))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r210": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
  },
  "r211": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
  },
  "r212": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
  },
  "r213": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "91",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Subparagraph": "(f)",
   "Topic": "606",
   "URI": "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
  },
  "r214": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "606",
   "URI": "http://asc.fasb.org/topic&trid=49130388"
  },
  "r215": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664"
  },
  "r216": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "15",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "712",
   "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664"
  },
  "r217": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919"
  },
  "r218": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919"
  },
  "r219": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r22": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(28))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r220": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r221": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r222": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(ii)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r223": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)(iv)(01)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r224": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r225": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r226": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r227": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r228": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r229": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(h)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r23": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(29))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r230": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(i),(j)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r231": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(j)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r232": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
  },
  "r233": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920"
  },
  "r234": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920"
  },
  "r235": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920"
  },
  "r236": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r237": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(1)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r238": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r239": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(3)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r24": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r240": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(4)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r241": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(5)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r242": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
  },
  "r243": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
  },
  "r244": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "70",
   "Topic": "715",
   "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942"
  },
  "r245": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "715",
   "URI": "http://asc.fasb.org/topic&trid=2235017"
  },
  "r246": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "35",
   "SubTopic": "10",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899"
  },
  "r247": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
  },
  "r248": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907"
  },
  "r249": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907"
  },
  "r25": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r250": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "40",
   "Topic": "718",
   "URI": "http://asc.fasb.org/extlink&oid=109244457&loc=d3e16649-113920"
  },
  "r251": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318"
  },
  "r252": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319"
  },
  "r253": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
  },
  "r254": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
  },
  "r255": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "9",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
  },
  "r256": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SAB Topic 6.I.7)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
  },
  "r257": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324"
  },
  "r258": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "740",
   "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
  },
  "r259": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "740",
   "URI": "http://asc.fasb.org/topic&trid=2144680"
  },
  "r26": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30)(a)(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r260": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683"
  },
  "r261": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683"
  },
  "r262": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "19",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
  },
  "r263": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683"
  },
  "r264": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "21",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613674-111683"
  },
  "r265": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r266": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r267": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r268": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r269": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c),(3)",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
  },
  "r27": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(30))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r270": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4I",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686"
  },
  "r271": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4J",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686"
  },
  "r272": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4K",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "810",
   "URI": "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686"
  },
  "r273": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "810",
   "URI": "http://asc.fasb.org/topic&trid=2197479"
  },
  "r274": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958"
  },
  "r275": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959"
  },
  "r276": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959"
  },
  "r277": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959"
  },
  "r278": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "c",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959"
  },
  "r279": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r28": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(31))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r280": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r281": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
  },
  "r282": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a),(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r283": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r284": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(d)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r285": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4B",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
  },
  "r286": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r287": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r288": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(e)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r289": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959"
  },
  "r29": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(32))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r290": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4CC",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959"
  },
  "r291": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(1)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r292": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)(2)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r293": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r294": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959"
  },
  "r295": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4E",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959"
  },
  "r296": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959"
  },
  "r297": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "182",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=116861445&loc=SL5629052-113961"
  },
  "r298": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "25",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986"
  },
  "r299": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "30",
   "Subparagraph": "(c)",
   "Topic": "815",
   "URI": "http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994"
  },
  "r3": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5C",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)(2)",
   "Topic": "205",
   "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760"
  },
  "r30": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(4)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r300": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r301": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r302": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r303": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r304": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(1)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r305": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(bbb)(2)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r306": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r307": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(h)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r308": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
  },
  "r309": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
  },
  "r31": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(4))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r310": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r311": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6A",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "820",
   "URI": "http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258"
  },
  "r312": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=116690757&loc=d3e13220-108610"
  },
  "r313": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611"
  },
  "r314": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611"
  },
  "r315": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "10",
   "Topic": "825",
   "URI": "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13476-108611"
  },
  "r316": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "230",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906"
  },
  "r317": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "20",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Subparagraph": "(b,c)",
   "Topic": "830",
   "URI": "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
  },
  "r318": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
  },
  "r319": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
  },
  "r32": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r320": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
  },
  "r321": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "8",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "30",
   "Topic": "835",
   "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
  },
  "r322": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "65",
   "SubTopic": "10",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984"
  },
  "r323": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
  },
  "r324": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
  },
  "r325": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918631-209977"
  },
  "r326": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977"
  },
  "r327": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
  },
  "r328": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
  },
  "r329": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
  },
  "r33": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r330": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
  },
  "r331": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r332": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r333": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r334": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(d)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r335": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(1)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r336": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(2)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r337": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(3)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r338": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(g)(4)",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r339": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
  },
  "r34": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(6)(c))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r340": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980"
  },
  "r341": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "53",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "842",
   "URI": "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971"
  },
  "r342": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r343": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(1)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r344": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r345": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(bb)(3)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
  },
  "r346": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4D",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)(2)",
   "Topic": "860",
   "URI": "http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719"
  },
  "r347": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "25",
   "SubTopic": "20",
   "Topic": "940",
   "URI": "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953"
  },
  "r348": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(1)(a))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r349": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(10))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r35": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(7))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r350": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(11))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r351": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(13))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r352": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(16))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r353": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r354": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r355": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03(7))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r356": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.13,16)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r357": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.16)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r358": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.9-03.17)",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
  },
  "r359": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(15))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r36": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(8))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r360": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(22))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r361": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.9-04(23))",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
  },
  "r362": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Subparagraph": "e",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r363": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "470",
   "Topic": "942",
   "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
  },
  "r364": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(16))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r365": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(10))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r366": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(12))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r367": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(2))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r368": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r369": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(24))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r37": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.1)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r370": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(25))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r371": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(5))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r372": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03(a)(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r373": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.(a),19)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r374": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.7-03.16(a))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
  },
  "r375": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(18))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r376": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(19))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r377": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "220",
   "Subparagraph": "(SX 210.7-04(8))",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
  },
  "r378": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "4H",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "40",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
  },
  "r379": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(a)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
  },
  "r38": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.13)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r380": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13H",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "40",
   "Subparagraph": "(b)",
   "Topic": "944",
   "URI": "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
  },
  "r381": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "210",
   "Subparagraph": "(SX 210.6-06(3))",
   "Topic": "946",
   "URI": "http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996"
  },
  "r382": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "310",
   "Subparagraph": "(SX 210.12-29(Footnote 4))",
   "Topic": "948",
   "URI": "http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014"
  },
  "r383": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 2))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
  },
  "r384": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "360",
   "Subparagraph": "(SX 210.12-28(Footnote 4))",
   "Topic": "970",
   "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
  },
  "r385": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b"
  },
  "r386": {
   "Name": "Exchange Act",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "d1-1"
  },
  "r387": {
   "Name": "Form 10-Q",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-13"
  },
  "r388": {
   "Name": "Forms 10-K, 10-Q, 20-F",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "13",
   "Subsection": "a-1-"
  },
  "r389": {
   "Name": "Regulation 12B",
   "Number": "240",
   "Publisher": "SEC",
   "Section": "12",
   "Subsection": "b-2"
  },
  "r39": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.14)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r390": {
   "Name": "Regulation S-T",
   "Number": "232",
   "Publisher": "SEC",
   "Section": "405"
  },
  "r4": {
   "Name": "Accounting Standards Codification",
   "Publisher": "FASB",
   "Topic": "205",
   "URI": "http://asc.fasb.org/topic&trid=2122149"
  },
  "r40": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.17)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r41": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a)(7))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r42": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r43": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19(b),22(b))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r44": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19,20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r45": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.19-26)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r46": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.20)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r47": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.21)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r48": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22(a)(1))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r49": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.22)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r5": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r50": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.24)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r51": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.25)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r52": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29,30)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r53": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.29-31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r54": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.31)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r55": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(a))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r56": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.6(c))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r57": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02.9)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
  },
  "r58": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-02(3))",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13728-122682"
  },
  "r59": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(a)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r6": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r60": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(b)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r61": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(c)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r62": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "50",
   "SubTopic": "20",
   "Subparagraph": "(e)",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312"
  },
  "r63": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313"
  },
  "r64": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313"
  },
  "r65": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "16",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226024-175313"
  },
  "r66": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "7",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "20",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313"
  },
  "r67": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r68": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a),(b),(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r69": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r7": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
  },
  "r70": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i),(j),(k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r71": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(i-k)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r72": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "10A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(j)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
  },
  "r73": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "11",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580"
  },
  "r74": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580"
  },
  "r75": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580"
  },
  "r76": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580"
  },
  "r77": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580"
  },
  "r78": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580"
  },
  "r79": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "17B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580"
  },
  "r8": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "3",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6801-107765"
  },
  "r80": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r81": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r82": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1A",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
  },
  "r83": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(a)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r84": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "1B",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
  },
  "r85": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "5",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580"
  },
  "r86": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "55",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581"
  },
  "r87": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(10))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r88": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(20))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r89": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(21))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r9": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "6",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Topic": "210",
   "URI": "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765"
  },
  "r90": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03(5))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r91": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.1,2)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r92": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.2(a),(d))",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r93": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.4)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r94": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Subparagraph": "(SX 210.5-03.7)",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r95": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "2",
   "Publisher": "FASB",
   "Section": "S99",
   "SubTopic": "10",
   "Topic": "220",
   "URI": "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
  },
  "r96": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "12",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
  },
  "r97": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "13",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(c)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
  },
  "r98": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "14",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
  },
  "r99": {
   "Name": "Accounting Standards Codification",
   "Paragraph": "15",
   "Publisher": "FASB",
   "Section": "45",
   "SubTopic": "10",
   "Subparagraph": "(b)",
   "Topic": "230",
   "URI": "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
  }
 },
 "version": "2.1"
}
