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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]    
Compensation and benefits $ 144.5 $ 126.5
Customer rebates and other credits 36.3 27.1
Medical insurance and workers’ compensation 26.5 25.5
Property, franchise sales and use taxes 26.3 16.5
Environmental liabilities and asset retirement obligations 3.8 4.6
Severance, retention, and relocation 2.1 4.1
Other 13.0 11.9
Total $ 252.5 $ 216.2