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Derivative Financial Instruments - Fair Value Hedges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value Hedges      
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship $ 3,178.5 $ 3,256.9  
Cumulative basis adjustments associated with portfolio layer hedging relationship (62.2) (102.4)  
Amount of hedged item in portfolio layer hedging relationship 1,395.0 1,110.0  
Gain (loss) from components excluded from assessment of fair value hedge effectiveness (1.8) 0.0 $ 0.0
Fixed maturities, available-for-sale      
Fair Value Hedges      
Carrying amount of hedged asset - Active hedging relationships 3,510.1 $ 3,498.6  
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 304.7 $ 48.8  
Carrying amount of hedged asset - Active or discontinued hedging relationships 3,814.8 3,547.4  
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (87.0) (153.4)  
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships (5.2) 1.3  
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships (92.2) $ (152.1)  
Investment contracts      
Fair Value Hedges      
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships 0.4    
Carrying amount of hedged liability - Active hedging relationships $ 300.5    
Hedged Liability, 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 liability - Active or discontinued hedging relationships $ 300.5    
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships $ 0.4