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GOODWILL
3 Months Ended
Mar. 31, 2018
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 three months ended March 31, 2018:
(in millions)
 
Wisconsin
 
Illinois
 
Other States
 
Non-Utility Energy Infrastructure
 
Total
Goodwill balance as of January 1, 2018
 
$
2,104.3

 
$
758.7

 
$
183.2

 
$
7.3

 
$
3,053.5

Adjustment to Bluewater purchase price allocation (1)
 

 

 

 
(0.7
)
 
(0.7
)
Goodwill balance as of March 31, 2018 (2)
 
$
2,104.3

 
$
758.7

 
$
183.2

 
$
6.6

 
$
3,052.8


(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 March 31, 2018.