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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill and other intangible assets    
Changes to the carrying amount of goodwill $ 0.0  
Intangible assets other than goodwill    
Unamortized intangible assets, carrying amount 0.4 $ 0.4
Total intangible assets, gross carrying amount 8.7 8.7
Amortized intangible assets, accumulated amortization (7.4) (6.8)
Total intangible assets, net carrying amount 1.3 1.9
Contractual service agreements    
Intangible assets other than goodwill    
Amortized intangible assets, gross carrying amount 8.3 8.3
Amortized intangible assets, accumulated amortization (7.4) (6.8)
Amortized intangible assets, net carrying amount $ 0.9 $ 1.5
Remaining amortization period 1 year