DEBT - Components of Interest Expense (Details) - 1.25% Convertible Senior Notes, Due December 2026 - Convertible Debt - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Debt Instrument, Redemption [Line Items]
Contractual interest	$ 6.3	$ 6.4	$ 12.6	$ 12.7
Amortization of debt discounts and debt issuance costs	1.3	1.2	2.6	2.4
Interest expense	$ 7.6	$ 7.6	$ 15.2	$ 15.1