Debt instrument redemption amount outstanding.

No definition available.

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- Definition

Gains losses on debt extinguishment.

+ References

No definition available.

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- Definition

Percentage of original principal of debt can be redeemed.

+ References

No definition available.

+ Details

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- Definition

Percentage of principal amount debt can be redeemed.

+ References

No definition available.

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- Definition

Principal amount debt can be redeemed.

+ References

No definition available.

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- Definition

Principal amount for partial redemption.

+ References

No definition available.

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- Definition

Restricted net asset exceeded percentage for consolidated subsidiaries requiring disclosure.

+ References

No definition available.

+ Details

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- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset.

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- Definition

Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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Debt - 2028 Notes - Additional Information (Detail) - USD ($) $ in Millions				12 Months Ended
	Jul. 23, 2021	Jul. 09, 2021	Aug. 21, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 22, 2020
Debt Instrument [Line Items]
Loss on retirement of debt				$ (5.5)	$ (17.7)	$ (0.2)
2028 Notes Embedded Derivative Fair Value					$ 2.3
2028 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 500.0
Debt Instrument, Interest Rate, Stated Percentage							8.50%
Loss on retirement of debt			$ 17.1
Redemption price as a percentage of principal amount	103.00%	104.00%			103.00%
Principal Amount For Partial Redemption	$ 50.0	$ 100.0			$ 50.0
Debt principal amount remained outstanding	$ 300.0
2028 Notes Embedded Derivative Fair Value				0.2	$ 2.3
Change in embedded derivative fair value				$ 2.1
2028 Notes [Member] \| Joseph T. Ryerson [Member]
Debt Instrument [Line Items]
Restricted net assets percentage				25.00%
Restricted net assets				$ 588.5
2028 Notes [Member] \| Redeemable in twelve months beginning August 1, 2023 [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				104.25%
2028 Notes [Member] \| Redeemable in twelve months beginning August 1, 2024 [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				102.125%
2028 Notes [Member] \| Redeemable in twelve months beginning August 1, 2025 and thereafter [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				100.00%
2028 Notes [Member] \| Redeemable before August 1, 2023 Including Make Whole Premium [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				100.00%
2028 Notes [Member] \| Redeemable before August 1, 2023 with the net cash proceeds from certain equity offerings [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				108.50%
Percentage of principal amount debt can be redeemed				40.00%
2028 Notes [Member] \| Redeemable each twelve months commencing on July 22, 2020 and prior to August 1, 2023 [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				103.00%
Percentage of principal amount debt can be redeemed				10.00%
2028 Notes [Member] \| Redeemable one time prior to August 1, 2022 from the net cash proceeds received from the sale of real property [Member]
Debt Instrument [Line Items]
Redemption price as a percentage of principal amount				104.00%
Principal Amount Debt Can Be Redeemed				$ 100.0