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Acquisition, Restructuring and Integration Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Schedule of acquisition related costs
 
Year Ended December 31,
(millions)
2018
 
2017
 
2016
General and administrative expenses
$
8.1

 
$
1.2

 
$
4.5

Depreciation and amortization
—

 
—

 
2.4

Total
$
8.1

 
$
1.2

 
$
6.9