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REVENUE RECOGNITION AND RECEIVABLES - Contract Acquisition Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Contract Acquisition Costs        
Amortization of contract acquisition cost $ 1.4 $ 0.5 $ 2.6 $ 1.5
Prepayments and other current assets        
Contract Acquisition Costs        
Short-term contract acquisition costs 2.2   2.2  
Other Assets        
Contract Acquisition Costs        
Long-term contract acquisition costs $ 7.7   $ 7.7