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Employee Benefits - Supplemental Bonus Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 35.5 | $ 53.0 | $ 42.1
Master Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 21.2 | 21.2 | 22.7
Other Defined Contribution Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 6.9 | 6.9 | 9.6
Deferred Compensation Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 2.5 | (0.3) | 5.0
Supplemental Executive Retirement Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 3.4 | 10.5 | 3.3
Defined Benefit Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 1.5 | $ 14.7 | $ 1.5

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