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ACCUMULATED OTHER COMPREHENSIVE LOSS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Foreign currency translation adjustment, other comprehensive income (loss) $ (8.7) $ (11.7) $ 9.4 $ 11.8