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BASIS OF PRESENTATION - Recently Issued Accounting Standards (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Decrease in net cash provided by (used in) operating activities $ 196.1 $ 120.7
Increase in net cash provided by (used in) financing activities (544.7) (5.8)
Accounting Standards Update 2016-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Decrease in net cash provided by (used in) operating activities   8.5
Increase in net cash provided by (used in) financing activities   $ 8.5
Increase in deferred tax assets 0.2  
Accounting Standards Update 2016-09 | Additional Paid-in Capital    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of new accounting principle in period of adoption 0.6  
Accounting Standards Update 2016-09 | Retained Earnings    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative effect of new accounting principle in period of adoption $ (0.4)