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REVENUE RECOGNITION - Contract Acquisition Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contract Acquisition Costs    
Amortization of contract acquisition cost $ 1.8 $ 1.6
Prepayments and other current assets    
Contract Acquisition Costs    
Short-term contract acquisition costs 1.7 1.4
Other assets    
Contract Acquisition Costs    
Long-term contract acquisition costs $ 1.1 $ 1.0