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Self-Insurance Self-Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Insurance [Line Items]
Self-insurance reserves - current portion	$ 529.2	$ 495.1
Self-insurance reserves - long-term portion	207.6	204.3
Self-insurance reserves [Member]
Insurance [Line Items]
Self-insurance reserves - current portion	27.2	24.9
Self-insurance reserves - long-term portion	47.6	46.5
Total self-insurance reserves	$ 74.8	$ 71.4

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-Publisher FASB
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