DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN NET REVENUES FOR DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Gains (losses) on derivative instruments not designated as hedging instruments	$ (222.7)	$ 217.8	$ 42.1
Investment Income (Loss) | Fixed indexed call options
Derivative [Line Items]
Gains (losses) on derivative instruments not designated as hedging instruments	(206.6)	220.9	39.5
Gain (Loss) on Investments | Embedded derivative related to modified coinsurance agreement | Embedded derivative related to modified coinsurance agreement
Derivative [Line Items]
Gains (losses) on derivative instruments not designated as hedging instruments	$ (16.1)	$ (3.1)	$ 2.6