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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Gross unrecognized income tax benefits $ 21.2 $ 19.5
Accrued interest and penalties related to unrecognized income tax benefits 8.5 7.9
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 14.9 $ 519.0