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REVENUE RECOGNITION - Contract Acquisition Costs (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Contract Acquisition Costs    
Amortization of contract acquisition cost $ 0.4 $ 0.9
Prepayments and other current assets    
Contract Acquisition Costs    
Short-term contract acquisition costs 1.1 1.1
Other assets    
Contract Acquisition Costs    
Long-term contract acquisition costs $ 1.4 $ 1.4