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BASIS OF PRESENTATION (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated other comprehensive loss $ 150.8 $ 132.7
Retained earnings 2,461.8 1,962.1
Other assets (34.8) (108.9)
Other long-term liabilities (282.5) (311.7)
Deferred income taxes (130.1) $ (167.1)
Accounting Standards Update 2017-12    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated other comprehensive loss 7.8  
Retained earnings 7.8  
Accounting Standards Update 2016-16    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Retained earnings 2.6  
Other assets 50.3  
Other long-term liabilities 52.9  
Deferred income taxes $ 46.5