REVENUE RECOGNITION - Rollforward of deferred revenue (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Revenue recognized from contract liabilities and remaining balance
Beginning Balance	$ 6.1
Cash Additions	18.6
Revenue Recognized	(18.5)
Ending Balance	6.2
Liquidity provider sliding scale
Revenue recognized from contract liabilities and remaining balance
Beginning Balance	0.0
Cash Additions	7.2
Revenue Recognized	(5.4)
Ending Balance	1.8
Other, net
Revenue recognized from contract liabilities and remaining balance
Beginning Balance	6.1
Cash Additions	11.4
Revenue Recognized	(13.1)
Ending Balance	$ 4.4