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Self-Insurance (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Insurance [Line Items] |  |
Self-insurance reserves - current portion | $ 566.8 | $ 529.2
Self-insurance reserves - long-term portion | 217.9 | 207.6
Self-insurance reserves [Member] |  |
Insurance [Line Items] |  |
Self-insurance reserves - current portion | 27.2 | 27.2
Self-insurance reserves - long-term portion | 48.7 | 47.6
Total self-insurance liabilities | $ 75.9 | $ 74.8

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