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Other Liabilities
 12 Months Ended
Dec. 31, 2019
Other Liabilities [Abstract]  
Other Liabilities Other Liabilities
(in millions) December 31,
 
2019
 
2018
Environmental
 
$
36.0

 
$
22.3

Long-term lease liabilities
 
91.5

 
—

Other
 
60.4

 
62.3

 
 
$
187.9

 
$
84.6