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REVENUE RECOGNITION - Rollforward of contract liabilities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Revenue recognized from contract liabilities and remaining balance  
Beginning Balance $ 10.2
Cash Additions 24.8
Revenue Recognition (19.7)
Ending Balance 15.3
Liquidity provider sliding scale  
Revenue recognized from contract liabilities and remaining balance  
Cash Additions 7.2
Revenue Recognition (7.2)
Other, net  
Revenue recognized from contract liabilities and remaining balance  
Beginning Balance 10.2
Cash Additions 17.6
Revenue Recognition (12.5)
Ending Balance $ 15.3