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REVENUE RECOGNITION - Rollforward of contract liabilities (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Revenue recognized from contract liabilities and remaining balance  
Beginning Balance $ 10.2
Cash Additions 18.5
Revenue Recognition (14.6)
Ending Balance 14.1
Liquidity provider sliding scale  
Revenue recognized from contract liabilities and remaining balance  
Cash Additions 7.2
Revenue Recognition (5.4)
Ending Balance 1.8
Other, net  
Revenue recognized from contract liabilities and remaining balance  
Beginning Balance 10.2
Cash Additions 11.3
Revenue Recognition (9.2)
Ending Balance $ 12.3