GOODWILL

Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. 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.

In the third quarter of 2017, annual impairment tests were completed at all of our reporting units that carried a goodwill balance as of July 1, 2017. No impairments resulted from these tests.