Restructuring, Merger and Acquisition Related Costs (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2018 and June 30, 2017 are summarized in the following table:

	Three Months Ended				Six Months Ended
(millions) (unaudited)	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
General and administrative expenses	$	1.6	$	1.0	$	2.8	$	1.1