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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Impairment of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]              
Impairment of goodwill $ 9.8 $ 58.9 $ 0.0 $ 0.0      
Goodwill [Member]              
Goodwill [Line Items]              
Impairment of goodwill $ 9.8 $ 57.8     $ 0.0 $ 0.0 $ 0.0