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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective income tax rate, excluding discrete items     25.60%   25.90%
Income taxes $ 36.7 $ 33.6 $ 68.2 $ 63.4  
Effective income tax rate (12233.30%) (275.40%) 675.20% (335.40%)  
Effective income tax rate reconciliation, tax contingency $ 5.5   $ 14.7