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Other Liabilities
 12 Months Ended
Dec. 31, 2017
Other Liabilities [Abstract]  
Other Liabilities
Other Liabilities
(in millions) December 31,
 
2017
 
2016
Environmental
 
$
31.9

 
$
34.0

Other
 
75.8

 
65.8

 
 
$
107.7

 
$
99.8