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ACCUMULATED OTHER COMPREHENSIVE LOSS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]        
Foreign currency translation adjustment, other comprehensive income (loss) $ 3.9 $ (11.2) $ (0.6) $ 0.1