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Other Accrued Liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Capital Expenditures Incurred but Not yet Paid $ 6.6 $ 6.3
Accrued interest 12.6 13.3
Current liability for pension and other postretirement employee benefits 6.2 7.4
Accrued taxes other than income taxes payable 10.5 7.1
Accrued discounts and allowances 4.9 6.6
Other 8.5 12.3
Accrued Liabilities, Current 58.0 60.7
Accrued Liabilities    
Operating Lease, Liability, Current 15.3 13.9
Operating Lease, Liability, Current $ 15.3 $ 13.9