Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] WebBank WebBank [Member] WebBank [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Agent Relationships Agent Relationships [Member] Agent Relationships [Member] Trade Names Trade Names [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] National Partners National Partners PFco, LLC [Member] National Partners PFco, LLC [Member] Metallon Metallon [Member] Metallon [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Fair value of consideration paid Business Combination, Consideration Transferred Loans payable Loans Payable Contingent consideration Business Combination, Contingent Consideration, Liability Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Goodwill Goodwill Goodwill expected to be deductible for tax purposes Business Acquisition, Goodwill, Expected Tax Deductible Amount Cash consideration Payments to Acquire Businesses, Gross Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Debt Disclosure [Abstract] Schedule of Long-term and Short-term Debt Schedule of Debt [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Executive Officer Executive Officer [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Percentage of sum of net income Share-Based Compensation Arrangement By Share-Based Payment Award, Sum Of Net Income, Percent Share-Based Compensation Arrangement By Share-Based Payment Award, Sum Of Net Income, Percent Percent difference between fair value of common stock and base amount Share-Based Compensation Arrangement By Share-Based Payment Award, Difference Between Fair Value Of Common Stock And Base Amount Share-Based Compensation Arrangement By Share-Based Payment Award, Difference Between Fair Value Of Common Stock And Base Amount Percent of budgeted net income Percentage Of Budgeted Net Income Percentage Of Budgeted Net Income Stockholders' Equity Note [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2018 Incentive Award Plan 2018 Incentive Award Plan [Member] 2018 Incentive Award Plan [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A Capital Unit, Class A [Member] Common Units Common Units [Member] Common Units [Member] Series A Preferred Units Series A Preferred Units [Member] Series A Preferred Units [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common units outstanding (in shares) Limited Partners' Capital Account, Units Outstanding Authorized amount Stock Repurchase Program, Authorized Amount Units issued in the acquisition of WFHC noncontrolling interests (in shares) Partners' Capital Account, Units, Treasury Units Purchased Units issued in acquisition of WFHC noncontrolling interests Partners' Capital Account, Treasury Units, Purchased Shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Unearned compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Preferred unit dividend Dividends, Preferred Stock, Cash Debt Instrument, Term Debt Instrument, Term Preferred Stock, Liquidation Preference Per Share Preferred Stock, Liquidation Preference Per Share Repurchase period in force Preferred Units, Computation of Common Units to be Issued Upon Redemption, Period Prior to Redemption for Computing Average Common Unit Price Preferred Units, Computation of Common Units to be Issued Upon Redemption, Period Prior to Redemption for Computing Average Common Unit Price Units redeemed (in shares) Partners' Capital Account, Units, Redeemed Additional redemption price (dollars per share) Partners' Capital Account, Units, Additional Redemption Price Per Unit Partners' Capital Account, Units, Additional Redemption Price Per Unit Redemption payment Partners' Capital Account, Redemptions Preferred units outstanding Preferred Units, Outstanding Incentive units granted, percentage of outstanding common units Incentive Units Granted, Percentage of Outstanding Common Units Incentive Units Granted, Percentage of Outstanding Common Units Current portion of long-term debt Long-term Debt, Current Maturities Total Long-term Debt 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three 2023 Long-term Debt, Maturities, Repayments of Principal in Year Four 2024 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Receivables [Abstract] Trade and Other Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Retirement Benefits [Abstract] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Inventory Disclosure [Abstract] Finished products Inventory, Finished Goods, Net of Reserves In-process Inventory, Work in Process, Net of Reserves Raw materials Inventory, Raw Materials, Net of Reserves Fine and fabricated precious metal in various stages of completion Other Inventory, Net of Reserves Inventory, before LIFO reserve Inventory, Before LIFO Reserves Inventory, Before LIFO Reserves LIFO reserve Inventory, LIFO Reserve Inventory, Net Inventory, Net Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Revenue from Contract with Customer [Abstract] Revenues Revenue from Contract with Customer [Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table] Schedule of Accumulated Other Comprehensive Income (Loss) [Table] Schedule of Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unrealized loss on available-for-sale debt securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Unrealized (loss) gain on derivative financial instruments Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Cumulative translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Change in net pension and other benefit obligations Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Balance at beginning of year Partners' Capital, Including Portion Attributable to Noncontrolling Interest Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Deconsolidation of API (see Note 3) Noncontrolling Interest, Decrease from Deconsolidation Balance at end of year Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Related Parties Related Parties [Member] Related Parties [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, eliminations Consolidation, Eliminations [Member] Deposits Deposits Precious metals stated at LIFO cost LIFO Inventory Amount Precious metals stated under non-LIFO cost methods, primarily at fair value LIFO Inventory Amount, Primarily at Fair Value LIFO Inventory Amount, Primarily at Fair Value Market value per ounce, Silver (in dollars per ounce) Market Value Per Ounce, Silver Market Value Per Ounce, Silver Market value per ounce, Gold (in dollars per ounce) Market Value Per Ounce, Gold Market Value Per Ounce, Gold Market value per ounce, Palladium (in dollars per ounce) Market Value Per Ounce, Palladium Market Value Per Ounce, Palladium Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Regulatory Matters [Abstract] Regulatory Matters [Abstract] Regulatory Matters Legal Matters and Contingencies [Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Steel Excel Inc. Steel Excel Inc. [Member] Steel Excel Inc. [Member] Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Gross realized gains Debt Securities, Available-for-sale, Realized Gain Gross realized losses Debt Securities, Available-for-sale, Realized Loss Realized losses, net Debt Securities, Available-for-sale, Realized Gain (Loss) Earnings Per Share [Abstract] Net (Loss) Income Per Common Unit Earnings Per Share [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Foreign Non-US [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net (loss) income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for loan losses Provision for Loan and Lease Losses Loss (income) of associated companies, net of taxes Equity Method Investments, Gain (Loss) of Associated Companies, Net of Taxes Equity Method Investments, Gain (Loss) of Associated Companies, Net of Taxes Realized and unrealized losses (gains) on securities, net Debt and Equity Securities, Gain (Loss) Derivative gains on economic interests in loans Derivative, Gain on Derivative Deferred income taxes Increase (Decrease) in Deferred Income Taxes Depreciation and amortization Depreciation, Depletion and Amortization Non-cash lease expense Noncash Lease Expense Noncash Lease Expense Equity-based compensation Share-based Compensation Asset impairment charges Asset Impairment Charges Other Other Noncash Income (Expense) Net change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Trade and other receivables Increase (Decrease) in Receivables Inventories Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable, accrued and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net decrease in loans held for sale Increase (Decrease) in Loans Held-for-sale Net cash provided by operating activities - continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in operating activities - discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Total cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of investments Payments to Acquire Investments Proceeds from sales of investments Proceeds from Sale, Maturity and Collection of Investments Proceeds from maturities of investments Proceeds from Sale of Short-term Investments Loan originations, net of collections Payments for (Proceeds from) Loans and Leases Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sales of assets Proceeds from Sale of Productive Assets Acquisitions Payments to Acquire Businesses, Net of Cash Acquired Other Payments for (Proceeds from) Other Investing Activities Net cash used in investing activities - continuing operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities - discontinued operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net revolver borrowings Proceeds from Lines of Credit Net (repayments) borrowings of term loans Repayments of Long-term Debt Net (repayments) borrowings of term loans Proceeds from Issuance of Long-term Debt Purchases of the Company's common units Payments To Acquire Treasury Units Payments To Acquire Treasury Units Redemption of SPLP preferred units Payments of Ordinary Dividends, Common Stock Deferred finance charges Payments of Financing Costs Net decrease in deposits Increase (Decrease) in Deposits Other Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities - continuing operations Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities - discontinued operations Cash Provided by (Used in) Financing Activities, Discontinued Operations Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net change for the period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Supplemental Cash Flow Elements [Abstract] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Taxes Income Taxes Paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis Presentation Basis of Accounting, Policy [Policy Text Block] Adoption of New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Disaggregation of Revenues Revenue from Contract with Customer [Policy Text Block] Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] API API [Member] API [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Revenue: Disposal Group, Including Discontinued Operation, Revenue Costs and expenses: Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Cost of goods sold Disposal Group, Including Discontinued Operation, Costs of Goods Sold Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Other expenses, net Disposal Group, Including Discontinued Operation, Other Expense Total costs and expenses Disposal Group, Including Discontinued Operation, Operating Expense Loss before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Income tax benefit Discontinued Operation, Tax Effect of Discontinued Operation Net loss Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Commodity By Type [Axis] Commodity By Type [Axis] Commodity By Type [Axis] Commodity Type [Domain] Commodity Type [Domain] Commodity Type [Domain] Silver, Ounces Silver, Ounces Gold, Ounces Gold, Ounces Palladium, Ounces Palladium Ounces Copper, Pounds Copper, Pounds [Member] Copper, Pounds [Member] Tin, Metric Tons Tin, Metric Tons [Member] Tin, Metric Tons [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Commodity Commodity Contract [Member] Derivative [Line Items] Derivative [Line Items] Amount Derivative, Nonmonetary Notional Amount, Mass Notional Value Derivative, Notional Amount1 Derivative, Notional Amount1 Income tax (benefit) provision Income Tax Expense (Benefit) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Management Fee Management Fee [Member] Management Fee [Member] Services fees and reimbursable expenses Related Party Transaction, Expenses from Transactions with Related Party Schedule of Outstanding Forward or Future Contracts with Settlement Dates Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Derivative Instruments, Gain (Loss) [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Commodity contracts Economic interests in loans Economic Interests In Loans [Member] Economic Interests In Loans [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued liabilities Accrued Liabilities [Member] Prepaid and other current assets Prepaid Expenses and Other Current Assets [Member] Other non-current assets Other Noncurrent Assets [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative assets Derivative Asset Derivative liabilities Derivative Liability Goodwill and Intangible Assets Disclosure [Abstract] Trademarks with indefinite lives Indefinite-Lived Trademarks Amortization expense Amortization of Intangible Assets Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) SP General Services LLC SP General Services LLC [Member] SP General Services LLC [Member] Reimbursable Expenses Reimbursable Expenses [Member] Reimbursable Expenses [Member] Management fee percentage, quarterly basis (as a percent) Related Party Transaction, Service Fee Percentage, Quarterly basis Related Party Transaction, Service Fee Percentage, Quarterly basis Management agreement renewal, term (in years) Management Agreement Renewal, Term Management Agreement Renewal, Term Notice period prior to management agreement renewal, period (in days) Notice Period Prior to Management Agreement Renewal, Period Notice Period Prior to Management Agreement Renewal, Period Unpaid amount for management fee Accounts Payable, Related Parties Deferred fees payable to related party Due to Related Parties Statement of Financial Position [Abstract] Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Loans held for sale Loans Receivable Held-for-sale, Amount Common units issued (in shares) Limited Partners' Capital Account, Units Issued Common units held in treasury (in shares) Limited Partners' Capital Account Units, Held in Treasury Limited Partners' Capital Account Units, Held in Treasury Common units held in treasury, at cost Limited Partners' Capital Account, Units Held in Treasury at Cost Limited Partners' Capital Account, Units Held in Treasury at Cost Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Schedule of Available-for-sale Securities and Equity Method Investments Schedule of Available-for-sale Securities and Equity Method Investments [Table Text Block] Schedule of Available-for-sale Securities and Equity Method Investments [Table Text Block] Schedule of Additional Disclosures of Associated Companies Schedule of Additional Disclosures of Associated Companies [Table Text Block] Schedule of Additional Disclosures of Associated Companies [Table Text Block] Schedule of Held-to-Maturity Securities Debt Securities, Held-to-maturity [Table Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Diversified industrial net sales Diversified Industrial [Member] Diversified Industrial [Member] Energy net revenue Energy [Member] Energy [Member] Financial services revenue Financial Services [Member] Financial Services [Member] Corporate and Other Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Operating Expenses Operating Expenses Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Inventory Supplemental Disclosure Inventory Supplemental Disclosure [Table Text Block] Inventory Supplemental Disclosure [Table Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Diversified Industrial Financial Services Corporate and Other Corporate Segment [Member] Goodwill [Line Items] Goodwill [Line Items] Gross goodwill Goodwill, Gross Accumulated impairments Goodwill, Impaired, Accumulated Impairment Loss Net goodwill Acquisitions Goodwill, Acquired During Period Currency translation adjustment Goodwill, Foreign Currency Translation Gain (Loss) Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Investments in Associated Companies Equity Method Investments [Member] Marketable Securities and Other Marketable Securities and Other [Member] Marketable Securities and Other [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance at beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales and cash collections Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Realized gains Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain Included In Earnings Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain Included In Earnings Unrealized gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains, Excluding Related Party Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Gains, Excluding Related Party Unrealized losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Losses, Excluding Related Party Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Unrealized Losses, Excluding Related Party Balance at end of period Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Multiple equity method investments Multiple Equity Method Investments [Member] Multiple Equity Method Investments [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Summary of balance sheet amounts: Summary of Balance Sheet Amounts [Abstract] Summary of Balance Sheet Amounts [Abstract] Current assets Equity Method Investment, Summarized Financial Information, Current Assets Non-current assets Equity Method Investment, Summarized Financial Information, Noncurrent Assets Total assets Equity Method Investment, Summarized Financial Information, Assets Current liabilities Equity Method Investment, Summarized Financial Information, Current Liabilities Non-current liabilities Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities Total liabilities Equity Method Investment, Summarized Financial Information, Liabilities Contingently redeemable preferred stock Equity Method Investment, Summarized Financial Information, Redeemable Preferred Stock Equity Equity Method Investments, Summarized Financial Information, Parent Equity Equity Method Investments, Summarized Financial Information, Parent Equity Total liabilities and equity Equity Method Investment, Summarized Financial Information, Liabilities and Equity Summary operating results: Summary Income Statement Amounts [Abstract] Summary Income Statement Amounts [Abstract] Net revenue Equity Method Investment, Summarized Financial Information, Revenue Gross profit Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) Net loss Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations Schedule of Equity Method Investments [Table] Held to maturity securities Debt Securities, Held-to-maturity Gross unrealized loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Fair value Debt Securities, Held-to-maturity, Fair Value Maturities held one through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost Maturities between years five and ten Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost Maturities, after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Customer relationships Products and Customer Relationships [Member] Products and Customer Relationships [Member] Trademarks, trade names and brand names Trademarks [Member] Developed technology, patents and patent applications Patents and Technology [Member] Patents and Technology [Member] Other Other Intangible Assets [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Finite-Lived Intangible Assets, Net Debt Debt Disclosure [Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents, Current Total cash, cash equivalents and restricted cash Loss Contingencies [Table] Loss Contingencies [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Preferred stock Preferred Stock [Member] Steel Connect, Inc (STCN) Steel Connect, Inc (STCN) [Member] Steel Connect, Inc (STCN) [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Environmental Exit Cost by Property [Axis] Environmental Exit Cost by Property [Axis] Environmental Exit Costs, Name of Property [Domain] Environmental Exit Costs, Name of Property [Domain] Costs Costs [Member] Costs [Member] Camden Camden [Member] Camden [Member] Camden - Past And Future Expenses Camden - Past And Future Expenses [Member] Camden - Past And Future Expenses [Member] Wayne facility Wayne Facility [Member] Wayne Facility [Member] Former Owner / Operator Former Owner / Operator [Member] Former Owner / Operator [Member] Hhem and HandH Hhem and HandH [Member] Hhem and HandH [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Adjacent Parcel Adjacent Parcel [Member] Adjacent Parcel [Member] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] Environmental and Other Matters Environmental and Other Matters [Member] Environmental and Other Matters [Member] Handy & Harman Ltd. (HNH) Handy & Harman Ltd. [Member] Handy & Harman Ltd. [Member] SLI SLI [Member] SLI [Member] BNS Subsidiary BNS Subsidiary [Member] BNS Subsidiary [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Insurance Claims Insurance Claims [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Accrual for environmental matters Accrual for Environmental Loss Contingencies Environmental exit costs, additional loss Environmental Exit Costs, Reasonably Possible Additional Loss Ownership responsibility for site investigation and remediation costs percentage allocation Ownership Responsibility For Site Investigation and Remediation Costs Percentage Allocation Ownership Responsibility For Site Investigation and Remediation Costs Percentage Allocation Payments Accrual for Environmental Loss Contingencies, Payments Investigation and remediation costs Environmental Remediation Expense Damages claimed Site Contingency, Loss Exposure Not Accrued, Damages Claimed Site Contingency, Loss Exposure Not Accrued, Damages Claimed Counteroffer Site Contingency, Loss Exposure, Not Accrued Counteroffer Site Contingency, Loss Exposure, Not Accrued Counteroffer Settlement amount Litigation Settlement, Amount Awarded to Other Party Insurance recoveries Insurance Recoveries Estimated insurance recoveries Estimated Insurance Recoveries Stock acquired Payments to Acquire Marketable Securities Settlement expense Litigation Settlement, Expense Loss contingency, number of defendants (in defendants) Loss Contingency, Number of Defendants Claims, litigation matters (in number of claims) Loss Contingency, Pending Claims, Number Accrual relating to open and active claims Loss Contingency Accrual Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Other income (expense), net Other Operating Income (Expense) [Member] Financial services revenue Sales [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (Loss) Derivative, Gain (Loss) on Derivative, Net Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Steel Excel Steel Excel [Member] Steel Excel [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Marketable securities Marketable Securities Unrealized gain (loss) Marketable Securities, Unrealized Gain (Loss) Securities sold during the period Sale of Available-for-sale Securities, Sold During the Period Sale of Available-for-sale Securities, Sold During the Period Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Restrictions on Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Marketable securities Marketable Securities [Member] Marketable Securities [Member] Long-term investments Other Long-term Investments [Member] Precious metal and commodity inventories recorded at fair value Precious metal and commodity inventories recorded at fair value [Member] Precious metal and commodity inventories recorded at fair value [Member] Commodity contracts on precious metal and commodity inventories Warrants Warrant [Member] Other precious metal liabilities Other Precious Metals [Member] Other Precious Metals [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets: Assets [Abstract] Derivative asset total Assets, Fair Value Disclosure Liabilities: Liabilities [Abstract] Financial instruments 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Obligations [Member] Corporate Obligations [Member] Net investment (loss) gain Net Investment (Loss) Gain [Member] Net Investment (Loss) Gain [Member] API Group plc (API) API Group PLC [Member] API Group PLC [Member] Aviat Networks, Inc. (Aviat) Aviat Networks, Inc. [Member] Aviat Networks, Inc. [Member] Other Other Investments at Fair Value [Member] Other Investments at Fair Value [Member] Aerojet Rocketdyne Holdings [Member] Aerojet Rocketdyne Holdings [Member] Aerojet Rocketdyne Holdings [Member] Babcock And Wilcox Enterprises [Member] Babcock And Wilcox Enterprises [Member] Babcock And Wilcox Enterprises [Member] AVAILABLE-FOR-SALE SECURITIES Debt Securities, Available-for-sale [Abstract] Equity securities - U.S. Marketable Securities [Abstract] Long-Term Investments Balance Marketable Securities, Noncurrent (Income) Loss Recorded in the Consolidated Statements of Operations Marketable Securities, Realized Gain (Loss) Equity method investments: (e) Equity Method Investment, Summarized Financial Information [Abstract] Investments in Associated Companies: Investments in Associated Companies [Abstract] Investments in Associated Companies [Abstract] Ownership percentage Equity Method Investment, Ownership Percentage Long-Term Investments Balance Equity Method Investments (Income) Loss Recorded in the Consolidated Statements of Operations Income (Loss) from Equity Method Investments Carried at cost: Other Investments [Abstract] Total Cost Debt Securities, Available-for-sale, Amortized Cost Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Marketable Securities, Noncurrent, Percentage Marketable Securities, Noncurrent, Percentage Marketable Securities, Noncurrent, Percentage Gross unrealized loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Debt conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Ratio Debt Instrument, Convertible, Conversion Ratio Ownership percentage if converted Conversion of Equity Investments, Ownership Percentage If converted Conversion of Equity Investments, Ownership Percentage If converted Financial Instruments Financial Instruments Disclosure [Text Block]