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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 136.7 $ 127.5
Medical insurance and workers’ compensation 27.5 23.9
Customer volume discounts and rebates 25.2 23.4
Franchise, property, sales and use taxes 13.4 16.0
Environmental liabilities and asset retirement obligations 5.0 4.0
Severance, retention, and relocation 2.2 3.1
Other 12.4 5.3
Total $ 222.4 $ 203.2