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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 106.1 $ 136.7
Medical insurance and workers’ compensation 27.5 27.5
Customer volume discounts and rebates 22.1 25.2
Franchise, property, sales and use taxes 21.1 13.4
Environmental liabilities and asset retirement obligations 5.0 5.0
Severance, retention, and relocation 4.0 2.2
Other 12.1 12.4
Total $ 197.9 $ 222.4