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Self-Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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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