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INTANGIBLE ASSETS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period $ 0.0 $ 11.4  
Goodwill at end of period 0.0 0.0 $ 11.4
Gross      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period 11.4 11.4 0.0
Additions during the year 0.0 0.0 11.4
Goodwill at end of period 11.4 11.4 11.4
Accumulated impairment      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Goodwill at begining of period (11.4) 0.0 0.0
Impairment losses for the year 0.0 (11.4) 0.0
Goodwill at end of period $ (11.4) $ (11.4) $ 0.0