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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 |  |

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