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GOODWILL
6 Months Ended
Jun. 30, 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 six months ended June 30, 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 June 30, 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 June 30, 2018.