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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 85.0 $ 124.5
Medical insurance and workers’ compensation 26.3 26.3
Customer volume discounts and rebates 24.0 27.9
Franchise, property, sales and use taxes 19.1 15.3
Environmental liabilities and asset retirement obligations 5.1 5.6
Severance, retention, and relocation 4.1 3.5
Other 15.2 14.4
Total $ 178.8 $ 217.5