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Central Merger and Restructuring, Merger and Integration Costs (Tables)
 12 Months Ended
Dec. 31, 2016
Business Combinations [Abstract]  
Schedule of Acquisition Related Costs
The aggregate costs associated with the restructuring, merger and integration costs (including those incurred in 2016 for workforce reductions) are summarized in the following table:
 
Year Ended December 31,
(millions)
2016
 
2015
 
2014
General and administrative expenses
$
4.5

 
$
6.2

 
$
8.5

Depreciation and amortization
2.4

 
1.0

 
—

Total
$
6.9

 
$
7.2

 
$
8.5