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Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued compensation and benefit costs $ 27.5 $ 24.9
National accounts accrual 29.7 23.3
Accrued property, sales, use and other related taxes 14.8 9.9
Accrued interest 7.5 9.1
Customer deposits 7.7 4.1
Self-insurance reserves 6.2 8.1
Income taxes payable 7.1 0.1
Other 12.8 8.7
Total accrued liabilities $ 113.3 $ 88.2