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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Effective income tax rate (as a percent) 24.60% 25.50% 21.70% 24.70%
Recognized discrete tax expense (benefit) $ 8.3 $ 4.5 $ (24.2) $ 3.6
Accounting Standards Update 2016-09        
Recognized discrete tax expense (benefit) $ (2.4)   $ (29.2)