DEBT - Interest expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of interest expense:
Contractual interest	$ 49.2	$ 59.8	$ 57.6
Amortization of debt discount and issuance costs	2.3	2.6	2.4
Interest expense	51.5	62.4	60.0
Interest income	(27.3)	(12.0)	(3.6)
Interest expense, net	$ 24.2	$ 50.4	$ 56.4