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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Line Items]      
Benefit from income taxes $ (1.6) $ (38.9)  
Increase (Decrease) in Income Tax Expense (Benefit) 37.3    
Impact of Tax Cuts and Jobs Act     $ 47.9
Domestic [Member]      
Income Tax Disclosure [Line Items]      
Tax loss carryforwards $ 519.3