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DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN EARNINGS FOR DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative [Line Items]      
Gains (losses) on derivative instruments not designated as hedging instruments $ 256.2 $ 129.3 $ (222.7)
Net pre-tax impact 77.1 (7.8) 265.8
Embedded derivative      
Derivative [Line Items]      
Embedded derivatives related to fixed indexed annuities (24.4) 8.5 45.9
Embedded derivative | Embedded derivatives related to fixed indexed annuities      
Derivative [Line Items]      
Embedded derivatives related to fixed indexed annuities 179.1 137.1 (488.5)
Investment Income (Loss) | Fixed indexed call options      
Derivative [Line Items]      
Gains (losses) on derivative instruments not designated as hedging instruments 255.8 129.0 (206.6)
Gain (Loss) on Investments | Embedded derivative | Embedded derivative related to modified coinsurance agreement      
Derivative [Line Items]      
Gains (losses) on derivative instruments not designated as hedging instruments $ 0.4 $ 0.3 $ (16.1)