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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Deferred revenue $ 10.6   $ 10.6   $ 18.0
Revenue recognized previously recorded in deferred revenue     18.0    
Amortization of deferred contract costs 3.6 $ 5.0 12.3 $ 15.5  
Revenue constrained and to be recognized in future periods $ 41.0   $ 41.0   $ 14.6