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REVENUE RECOGNITION - Contract Acquisition Costs (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Contract Acquisition Costs    
Amortization of contract acquisition cost $ 0.5 $ 1.4
Prepayments and other current assets    
Contract Acquisition Costs    
Short-term contract acquisition costs 1.6 1.6
Other assets    
Contract Acquisition Costs    
Long-term contract acquisition costs $ 1.0 $ 1.0