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DERIVATIVES - NARRATIVE (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Derivative [Line Items]      
Embedded derivative $ 68.1    
Fixed indexed call options      
Derivative [Line Items]      
Notional amount 4,400.0   $ 4,500.0
Embedded Derivative Related to Fixed Maturity Securities | Fixed indexed annuities      
Derivative [Line Items]      
Purchases of fixed maturity securities containing embedded derivatives 52.0 $ 51.2  
Sales of fixed maturity securities containing embedded derivatives $ 115.5 $ 110.0