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ACCUMULATED OTHER COMPREHENSIVE LOSS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Foreign currency translation adjustment, other comprehensive income (loss) $ 4.1 $ 8.8 $ (7.4) $ 7.5