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Derivative Financial Instruments - Fair Value Hedges (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Fair Value Hedges |  |  |
Carrying amount of hedged liability - Active hedging relationships | $ 3,295.9 |  | $ 2,769.6
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Contractholder Funds. |  | Contractholder Funds.
Carrying amount of hedged liability - Active or discontinued hedging relationships | $ 3,295.9 |  | $ 2,769.6
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | 13.5 |  | (22.0)
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | 13.5 |  | (22.0)
Gain (loss) from components excluded from assessment of fair value hedge effectiveness | 1.1 | $ 0.0 |
Fixed maturities, available-for-sale |  |  |
Fair Value Hedges |  |  |
Carrying amount of hedged asset - Active hedging relationships | $ 3,138.5 |  | $ 3,208.4
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 | $ 508.7 |  | $ 528.6
Carrying amount of hedged asset - Active or discontinued hedging relationships | 3,647.2 |  | 3,737.0
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | (58.9) |  | (33.1)
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships | (6.1) |  | (7.0)
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | (65.0) |  | (40.1)
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship | 2,760.6 |  | 2,849.3
Cumulative basis adjustments associated with portfolio layer hedging relationship | (37.5) |  | (55.7)
Amount of hedged item in portfolio layer hedging relationship | 1,160.0 |  | 1,160.0
Mortgage loans |  |  |
Fair Value Hedges |  |  |
Carrying amount of hedged asset - Active hedging relationships | $ 1,663.7 |  | $ 1,707.1
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 | $ 1,663.7 |  | $ 1,707.1
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | (3.1) |  | (8.4)
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | (3.1) |  | (8.4)
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship | 1,663.7 |  | 1,707.1
Cumulative basis adjustments associated with portfolio layer hedging relationship | (3.1) |  | (8.4)
Amount of hedged item in portfolio layer hedging relationship | $ 220.0 |  | $ 220.0

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