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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Deferred revenue $ 8.9   $ 11.2
Amortization of deferred contract costs $ 2.6 $ 4.7