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Employee Benefits - Supplemental Bonus Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 42.1 | $ 45.0 | $ 45.9
Master Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 22.7 | 28.1 | 25.0
Other defined contribution plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 9.6 | 9.4 | 9.0
ESOP |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans |  | 1.9 | 1.8
Reliance Deferred Compensation Plan |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 5.0 | 0.9 | 0.9
SERPs |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | 3.3 | 2.9 | 6.5
Defined Benefit Plans |  |  |
Contributions to Company Sponsored Retirement Plans |  |  |
Company's expense for Reliance-sponsored retirement plans | $ 1.5 | $ 1.8 | $ 2.7

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