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ACCOUNTING FOR DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN NET INCOME FOR DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	$ (57.2)	$ (39.1)	$ 22.4	$ (216.5)
Net pre-tax impact	68.6	90.0	60.1	309.0
Embedded derivatives
Derivative [Line Items]
Embedded derivatives related to fixed indexed annuities			11.4	37.4
Embedded derivatives | Fixed indexed annuities
Derivative [Line Items]
Embedded derivatives related to fixed indexed annuities	(125.8)	(129.1)	(37.7)	(525.5)
Net investment income (loss) from policyholder and other special-purpose portfolios | Fixed indexed call options
Derivative [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	(55.0)	(34.7)	24.9	(165.7)
Net realized gains (losses) | Embedded derivatives | Coinsurance agreements
Derivative [Line Items]
Gains (losses) on derivatives not designated as hedging instruments	$ (2.2)	$ (4.4)	$ (2.5)	$ (50.8)

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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