DEBT - Schedule of Carrying Values and Estimated Fair Values of Convertible Notes (Details) - 1.25% Convertible Senior Notes, Due December 2026 - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument, Redemption [Line Items]
Principal Amount	$ 2,012.5	$ 2,012.5
Unamortized Debt Discounts and Issuance Costs	(15.5)	(20.7)
Net Carrying Amount	1,997.0	1,991.8
Level 2:
Debt Instrument, Redemption [Line Items]
Fair Value (Level 2)	$ 1,061.6	$ 1,041.5