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Derivative Financial Instruments - Fair Value Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fixed maturities, available-for-sale      
Fair Value Hedges      
Carrying amount of hedged item - Active hedging relationships $ 3,441.6 $ 3,441.6 $ 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 Debt Securities, Available-for-Sale, Excluding Accrued Interest
Carrying amount of hedged item - Discontinued hedging relationships $ 77.2 $ 77.2 $ 48.8
Carrying amount of hedged item - Active or discontinued hedging relationships 3,518.8 3,518.8 3,547.4
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (138.3) (138.3) (153.4)
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships 0.1 0.1 1.3
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships (138.2) (138.2) (152.1)
Amortized cost basis of closed portfolio used in last-of-layer hedging relationship 3,234.8 3,234.8 3,256.9
Cumulative basis adjustments associated with last-of-layer hedging relationship (100.8) (100.8) (102.4)
Amount of hedged item in last-of-layer hedging relationship 1,210.0 1,210.0 1,110.0
Amount of derivative instruments' gain (loss) was excluded from the assessment of hedge effectiveness 0.0 (0.8)  
Investment contracts      
Fair Value Hedges      
Carrying amount of hedged item - Active hedging relationships $ 297.5 $ 297.5 $ 0.0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Accrued Investment Income Receivable Accrued Investment Income Receivable Accrued Investment Income Receivable
Carrying amount of hedged item - Active or discontinued hedging relationships $ 297.5 $ 297.5  
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships (2.6) (2.6)  
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships $ (2.6) $ (2.6)