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BASIS OF PRESENTATION (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accumulated other comprehensive loss $ 139.0 $ 132.7
Retained earnings 2,687.7 1,962.1
Other assets (35.2) (108.9)
Other long-term liabilities (285.1) (311.7)
Deferred income taxes (115.1) (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