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

We had no changes to the carrying amount of goodwill during the six months ended June 30, 2015, and 2014.

In the second quarter of 2015, annual impairment tests were completed at all of our reporting units that carried a goodwill balance as of April 1,
2015. No impairments resulted from these tests.

The identifiable intangible assets other than goodwill listed below are part of other long-term assets on the balance sheets.
 
 
June 30, 2015
 
December 31, 2014
(Millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Amortized intangible assets (1)
 
$
27.1

 
$
(11.6
)
 
$
15.5

 
$
34.9

 
$
(11.9
)
 
$
23.0

Unamortized intangible assets (2)
 
10.7

 

 
10.7

 
10.2

 

 
10.2

Total intangible assets
 
$
37.8

 
$
(11.6
)
 
$
26.2

 
$
45.1

 
$
(11.9
)
 
$
33.2


(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 the Fox Energy Center. The remaining weighted-average amortization period for our amortized intangible assets at June 30, 2015, was approximately five years.

(2) 
Consists primarily of trade names.