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CONTRACT BALANCES - Remaining Performance Obligation (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation to be satisfied (percent) 46.00%
Remaining performance obligation satisfaction period 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Transaction price allocated to remaining performance obligation $ 487.0
Remaining performance obligation to be satisfied (percent) 27.00%
Remaining performance obligation satisfaction period 12 months