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REVENUE RECOGNITION AND RECEIVABLES - Contract Acquisition Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Contract Acquisition Costs        
Amortization of contract acquisition cost $ 0.6 $ 0.5 $ 1.2 $ 1.0
Prepayments and other current assets        
Contract Acquisition Costs        
Short-term contract acquisition costs 2.1   2.1  
Other Assets        
Contract Acquisition Costs        
Long-term contract acquisition costs $ 1.4   $ 1.4