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REVENUE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]          
Contract asset $ 7.3   $ 7.3   $ 6.4
Contract liability 1.1   1.1   $ 0.7
Revenue recognized from prior period 0.1 $ 0.1 $ 0.7 $ 0.6  
Estimated variable consideration, increase in revenue $ 0.1 $ 0.3