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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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Effective income tax rate (20.40%) (34.80%)  
Provisional income tax expense, Tax Cuts and Jobs Act of 2017 $ 0.7   $ 5.5
Excess tax benefit from share-based compensation $ 2.8 $ 2.7  
Effective income tax rate reduction, excess tax benefits share-based compensation (30.90%) (57.70%)  
Income tax expense, to be paid within one year, Tax Cuts and Jobs Act of 2017 $ 0.4    
Tax benefit, re-measurement of net deferred tax liabilities, Tax Cuts and Jobs Act of 2017     $ 43.4