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Accounts Payable And Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Trade accounts payable $ 261.0 $ 280.8
Excise taxes/withholdings payable 84.1 86.2
Accrued insurance obligations 30.3 24.4
Accrued taxes other than income 31.7 25.6
Accrued compensation and benefits 32.5 26.5
Other 31.5 22.7
Accounts payable and accrued liabilities $ 471.1 $ 466.2