Goodwill (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of amounts for goodwill and changes to carrying value by operating segment

The amounts for goodwill and changes to carrying value by operating segment are as follows:

(millions) (unaudited)	Region One		Region Two		Total
Balance as of December 31, 2016 (1)	$	368.7	$	62.7	$	431.4
Foreign currency translation	0.2		—		0.2
Balance as of June 30, 2017	$	368.9	$	62.7	$	431.6

(1) Due to the new segment reporting effective in the first quarter of 2017, goodwill allocated to previous reporting units of Region One and Region Three have been aggregated into a single operating segment, Region One. See also Note 14. Business Unit Segment Information for further discussion on certain organizational and executive leadership changes.