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Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill balances by segment

The following table shows changes to our goodwill balances by segment during the years ended December 31, 2017 and 2016:



		Wisconsin								Illinois								Other States								Non-Utility Energy Infrastructure								Total
(in millions)		2017				2016				2017				2016				2017				2016				2017				2016				2017				2016
Goodwill balance as of January 1		$	2,104.3			$	2,109.5			$	758.7			$	731.2			$	183.2			$	182.8			$	—			$	—			$	3,046.2			$	3,023.5
Adjustment to Integrys purchase price allocation		—				(5.2		)		—				27.5				—				0.4				—				—				—				22.7
Acquisition of Bluewater ⁽¹⁾		—				—				—				—				—				—				7.3				—				7.3				—
Goodwill balance as of December 31 ⁽²⁾		$	2,104.3			$	2,104.3			$	758.7			$	758.7			$	183.2			$	183.2			$	7.3			$	—			$	3,053.5			$	3,046.2


⁽¹⁾	See Note 2, Acquisitions, for more information on the acquisition of Bluewater.


⁽²⁾	We had no accumulated impairment losses related to our goodwill as of December 31, 2017.