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GOODWILL AND OTHER INTANGIBLE ASSETS
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. We had no changes to the carrying amount of goodwill during the six months ended June 30, 2019.

The identifiable intangible assets other than goodwill listed below are classified as other long-term assets on our balance sheets.
 
 
June 30, 2019
 
December 31, 2018
(in millions)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Amortized intangible assets *
 
$
8.3

 
$
(7.4
)
 
$
0.9

 
$
8.3

 
$
(6.8
)
 
$
1.5

Unamortized intangible assets
 
0.4

 
—

 
0.4

 
0.4

 
—

 
0.4

Total intangible assets
 
$
8.7

 
$
(7.4
)
 
$
1.3

 
$
8.7

 
$
(6.8
)
 
$
1.9


*
Represents a contractual service agreement that provides for major maintenance and protection against unforeseen maintenance costs related to the combustion turbine generators at the Fox Energy Center. The remaining amortization period at June 30, 2019 was less than one year.