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Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain |  |  |  | $ 0.3
Ryerson Canada Bargaining Unit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Loss on pension settlement | $ 2.2 |  |  |
Ryerson Canada Bargaining Unit Pension Plan [Member] | Lump Sum Payments [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment price for purchased annuities on behalf of participants | 1.2 |  |  |
Ryerson Canada Bargaining Unit Pension Plan [Member] | Plan Participants Annuities Purchased [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment price for purchased annuities on behalf of participants | 5.0 |  |  |
Central Steel and Wire Retirement Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain | $ 0.3 | $ 0.5 |  |
Settlement gain |  |  | $ 0.5 | 1.1
Pension Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain |  |  |  | $ 0.2
Contribution to the pension plan fund |  |  | 10.3 |
Anticipated minimum required pension contribution funding |  |  | $ 4.9 |

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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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