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Accrued Expenses
 9 Months Ended
Sep. 30, 2020
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
September 30,
2020		December 31,
2019
 (in millions)
Salaries, wages and employee benefits$45.9 $43.7 
Interest9.7 5.1 
Environmental26.1 25.2 
Income taxes9.7 13.5 
Taxes other than income taxes9.7 9.1 
Operating lease liabilities8.9 9.3 
Legal settlement7.8 0.4 
Other36.3 31.0 
$154.1 $137.3