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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Effective income tax rate (35.40%) 14.60% (35.20%) 12.60%  
Excess tax benefit, share-based compensation $ 3.1   $ 4.0    
Income tax benefit from release of uncertain tax positions   $ 0.2      
Filing of foreign income tax returns     $ 0.2    
Scenario, Forecast          
Income Tax Contingency [Line Items]          
Effective income tax rate         8.30%