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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS

The following table shows changes to the carrying amount of our goodwill. There were no impairments recorded in 2015. We have not yet completed the allocation of goodwill to our business segments for the acquisition of Integrys, but we plan to complete it during 2015.
(in millions)
 
 
Goodwill balance at December 31, 2014
 
$
441.9

Acquisition of Integrys *
 
2,947.2

Goodwill balance at September 30, 2015
 
$
3,389.1


*
See Note 2, Acquisition, for more information.

The identifiable intangible assets other than goodwill listed below are part of other long-term assets on the balance sheets. We had no material intangible assets other than goodwill at December 31, 2014.
 
 
September 30, 2015
(in millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Amortized intangible assets (1)
 
$
16.0

 
$
(7.0
)
 
$
9.0

Unamortized intangible assets (2)
 
5.7

 

 
5.7

Total intangible assets
 
$
21.7

 
$
(7.0
)
 
$
14.7


(1) 
Primarily relates to contractual service agreements that provide for major maintenance and protection against unforeseen maintenance costs related to the combustion turbine generators at WPS's Fox Energy Center. The remaining weighted-average amortization period for our amortized intangible assets at September 30, 2015, was approximately three years.

(2) 
Consists primarily of a trade name.