Restructuring, Merger and Acquisition Related Costs (Tables)

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Schedule of Acquisition Related Costs

The aggregate costs associated with the restructuring, merger and acquisition related costs for the three and nine months ended September 30, 2018 and September 30, 2017 are summarized in the following table:

	Three Months Ended				Nine Months Ended
(millions) (unaudited)	September 30, 2018		September 30, 2017		September 30, 2018		September 30, 2017
General and administrative expenses	$	0.6	$	—	$	3.4	$	1.1