DEBT - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt - components of interest expense
Contractual interest	$ 15.5	$ 11.3	$ 41.1	$ 34.7
Amortization of debt discount and issuance costs	0.6	0.4	1.8	1.8
Interest expense	16.1	11.7	42.9	36.5
Interest income	(0.8)		(2.2)	(0.2)
Interest expense, net	$ 15.3	$ 11.7	$ 40.7	$ 36.3