DEBT - Schedule of Convertible Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jan. 14, 2020
Debt Instrument [Line Items]
Unamortized debt discount and issuance costs	$ 29.3	$ 31.8
Carrying Amount	$ 35.1	31.9
Convertible senior 6.75% promissory notes due January 2025
Debt Instrument [Line Items]
Stated interest rate	6.75%
Debt instrument, face amount	$ 38.8	38.8
Unamortized debt discount and issuance costs	$ 3.7	$ 6.9	$ 13.5