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Employee Benefits - Contributions to Reliance Sponsored Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 50.0 | $ 47.0 | $ 45.6
Master 401(k) Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 32.7 | 29.3 | 28.1
Precision Strip Retirement and Savings Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 11.6 | 10.9 | 9.2
DCP |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 0.8 | 2.4 | 2.0
Other Defined Contribution Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 2.2 | 2.0 | 2.0
DB Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 1.3 | 1.2 | 0.3
Supplemental Executive Retirement Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 1.4 | $ 1.2 | $ 4.0

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