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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity [Abstract]        
Foreign exchange gains (losses) $ (9.6) $ 6.4 $ (3.7) $ 9.8