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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 81.6 $ 136.7
Medical insurance and workers’ compensation 26.9 27.5
Customer volume discounts and rebates 18.4 25.2
Franchise, property, sales and use taxes 17.0 13.4
Environmental liabilities and asset retirement obligations 5.3 5.0
Severance, retention, and relocation 2.0 2.2
Other 9.7 12.4
Total $ 160.9 $ 222.4