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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 124.5 $ 136.7
Customer volume discounts and rebates 27.9 25.2
Medical insurance and workers’ compensation 26.3 27.5
Franchise, property, sales and use taxes 15.3 13.4
Environmental liabilities and asset retirement obligations 5.6 5.0
Severance, retention, and relocation 3.5 2.2
Other 14.4 12.4
Total $ 217.5 $ 222.4