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Derivative Financial Instruments - Fair Value Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Hedges      
Carrying amount of hedged liability - Active hedging relationships $ 2,769.6 $ 300.5  
Hedged Liability, Statement of Financial Position [Extensible Enumeration] Contractholder Funds. Contractholder Funds.  
Carrying amount of hedged liability - Active or discontinued hedging relationships $ 2,769.6 $ 300.5  
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (22.0) 0.4  
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships (22.0) 0.4  
Gain (loss) from components excluded from assessment of fair value hedge effectiveness (0.9) (1.8) $ 0.0
Fixed maturities, available-for-sale      
Fair Value Hedges      
Carrying amount of hedged asset - Active hedging relationships $ 3,208.4 $ 3,510.1  
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Excluding Accrued Interest Debt Securities, Available-for-Sale, Excluding Accrued Interest  
Carrying amount of hedged asset - Discontinued hedging relationships $ 528.6 $ 304.7  
Carrying amount of hedged asset - Active or discontinued hedging relationships 3,737.0 3,814.8  
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (33.1) (87.0)  
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships (7.0) (5.2)  
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships (40.1) (92.2)  
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship 2,849.3 3,178.5  
Cumulative basis adjustments associated with portfolio layer hedging relationship (55.7) (62.2)  
Amount of hedged item in portfolio layer hedging relationship 1,160.0 1,395.0  
Mortgage loans      
Fair Value Hedges      
Carrying amount of hedged asset - Active hedging relationships $ 1,707.1 $ 0.0  
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Mortgage Loans on Real Estate, Commercial and Consumer, Net Mortgage Loans on Real Estate, Commercial and Consumer, Net  
Carrying amount of hedged asset - Active or discontinued hedging relationships $ 1,707.1 $ 0.0  
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (8.4) 0.0  
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships (8.4) 0.0  
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship 1,707.1 0.0  
Cumulative basis adjustments associated with portfolio layer hedging relationship (8.4) 0.0  
Amount of hedged item in portfolio layer hedging relationship $ 220.0 $ 0.0