Central Merger and Restructuring, Merger and Integration Costs (Tables)

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Schedule of acquisition related costs

The aggregate costs associated with the restructuring, merger and integration costs are summarized in the following table:

	Three Months Ended				Nine Months Ended
(millions) (unaudited)	September 30, 2017		September 30, 2016		September 30, 2017		September 30, 2016
General and administrative expenses	$	—	$	0.2	$	1.1	$	1.1
Depreciation and amortization	—		—		—		2.4
Total	$	—	$	0.2	$	1.1	$	3.5