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GOODWILL
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL
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 nine months ended September 30, 2017:
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Non-Utility Energy Infrastructure
 
Total
Goodwill balance as of January 1, 2017
 
$
2,104.3

 
$
758.7

 
$
183.2

 
$

 
$
3,046.2

Acquisition of Bluewater (1)
 

 

 

 
7.3

 
7.3

Goodwill balance as of September 30, 2017 (2)
 
$
2,104.3

 
$
758.7

 
$
183.2

 
$
7.3

 
$
3,053.5


(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 September 30, 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.