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Self-Insurance (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Insurance [Line Items] |  |
Self-insurance reserves - current portion | $ 574.2 | $ 535.8
Self-insurance reserves - long-term portion | 322.3 | 310.6
Self-insurance reserves [Member] |  |
Insurance [Line Items] |  |
Self-insurance reserves - current portion | 44.6 | 35.4
Self-insurance reserves - long-term portion | 51.2 | 47.0
Total self-insurance liabilities | $ 95.8 | $ 82.4

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