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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Effective income tax rate, excluding discrete items 26.50% 26.80%
Income taxes $ 31.5 $ 29.8
Effective income tax rate 302.90% (444.80%)
Effective income tax rate reconciliation, tax contingency $ 9.2