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Self-Insurance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Self Insurance Reserves [Abstract]      
Self insurance reserve $ 155.6 $ 165.0  
Self insurance reserves, noncurrent 94.5 101.7  
Accrual receivable 13.1 17.5  
Accrued reserves decreased facility operating expense 14.6 9.9 $ 35.4
Cash deposits for self insured retention risk 14.7 12.7  
Letters of credit associated to the secured self-insured retention risk 71.8 71.8  
Cash deposit to collateralize the insurance policy $ 13.7 $ 33.9