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Commitments and Contingencies - Workers' Compensation and Related Losses (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Workers' Compensation Claims and Related Losses    
Accrued workers compensation claims $ 19.5 $ 14.9
Workers' compensation included in accrued expenses 4.5 4.6
Workers' compensation included in other long-term liabilities 15.0 10.3
Limits in excess of occurrence for reimbursement of workers' compensation 0.5  
Workers' compensation insurance recovery receivable $ 6.6 $ 7.0