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BASIS OF PRESENTATION - Recently Issued Accounting Standards (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in net cash provided by (used in) operating activities $ (56.2) $ 100.3  
Increase (decrease) in net cash provided by (used in) financing activities (1,434.1) (226.8)  
Accounting Standards Update 2016-09      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in net cash provided by (used in) operating activities   9.5  
Increase (decrease) in net cash provided by (used in) financing activities   (9.5)  
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)
Accounting Standards Update 2016-15      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in net cash provided by (used in) operating activities 36.4 0.0  
Increase (decrease) in net cash provided by (used in) financing activities $ (36.4) $ 0.0