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BASIS OF PRESENTATION - Additional Information (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and Cash Equivalents        
Cash and cash equivalents, not immediately available for use $ 5.6 $ 5.0    
Cash and cash equivalents - continuing operations 373.6 626.5    
Cash and cash equivalents - held for sale 3.5 3.6    
Total cash and cash equivalents $ 377.1 $ 630.1 $ 558.6 $ 501.9