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Derivatives and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Derivatives Fair Value [Line Items] |  |
Derivative asset, subject to master netting arrangement, after offset | $ 3.9 | $ 0.0
Minimum [Member] |  |
Derivatives Fair Value [Line Items] |  |
General term for commodity and exchange contracts | 1 month |
Maximum [Member] |  |
Derivatives Fair Value [Line Items] |  |
General term for commodity and exchange contracts | 12 months |
Ryerson Credit Facility [Member] |  |
Derivatives Fair Value [Line Items] |  |
Credit facility terms | 30 to 90 days |

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