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REVENUE RECOGNITION - CONTRACTED REVENUE (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 29.3 $ 30.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 13.9  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period 3 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01    
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation $ 15.4  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, period