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Accrued Expenses
12 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Accrued Expenses
10.Accrued Expenses
 As of December 31,
 20212020
 (in millions)
Salaries, wages and employee benefits$60.5 $46.3 
Interest4.9 4.4 
Environmental11.3 12.6 
Income taxes10.6 9.9 
Taxes other than income9.4 9.4 
Operating lease liability10.0 10.1 
Other28.5 35.7 
$135.2 $128.4