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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of identifiable intangible assets other than goodwill
The identifiable intangible assets other than goodwill listed below are classified as other long-term assets on our balance sheets.
 
 
December 31, 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

 
$
(8.0
)
 
$
0.3

 
$
8.3

 
$
(6.8
)
 
$
1.5

Unamortized intangible assets
 
0.4

 
—

 
0.4

 
0.4

 
—

 
0.4

Total intangible assets
 
$
8.7

 
$
(8.0
)
 
$
0.7

 
$
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 December 31, 2019, was less than one year.