DEBT - Interest expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Components of interest expense:
Contractual interest	$ 49.9	$ 49.2	$ 59.8
Amortization of debt discount and issuance costs	2.4	2.3	2.6
Interest expense	52.3	51.5	62.4
Interest income	(49.4)	(27.3)	(12.0)
Interest expense, net	$ 2.9	$ 24.2	$ 50.4