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Derivative Financial Instruments - Fair Value Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Fair Value Hedges |  |  |  |  |
Carrying amount of hedged asset - Active hedging relationships | $ 3,328.1 |  | $ 3,328.1 |  | $ 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 |  | Debt Securities, Available-for-Sale, Excluding Accrued Interest
Carrying amount of hedged asset - Discontinued hedging relationships | $ 340.3 |  | $ 340.3 |  | $ 304.7
Carrying amount of hedged asset - Active or discontinued hedging relationships | 3,668.4 |  | 3,668.4 |  | 3,814.8
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | (105.8) |  | (105.8) |  | (87.0)
Cumulative amount of fair value hedging basis adjustment - Discontinued hedging relationships | (6.1) |  | (6.1) |  | (5.2)
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | (111.9) |  | (111.9) |  | (92.2)
Carrying amount of hedged liability - Active hedging relationships | $ 1,454.2 |  | $ 1,454.2 |  | $ 300.5
Hedged Liability, Statement of Financial Position [Extensible Enumeration] | Contractholder Funds. |  | Contractholder Funds. |  | Contractholder Funds.
Carrying amount of hedged liability - Active or discontinued hedging relationships | $ 1,454.2 |  | $ 1,454.2 |  | $ 300.5
Cumulative amount of fair value hedging basis adjustment - Active hedging relationships | (18.0) |  | (18.0) |  | 0.4
Cumulative amount of fair value hedging basis adjustment - Active or discontinued hedging relationships | (18.0) |  | (18.0) |  | 0.4
Amortized cost basis of closed portfolio used in portfolio layer hedging relationship | 3,028.5 |  | 3,028.5 |  | 3,178.5
Cumulative basis adjustments associated with portfolio layer hedging relationship | (74.9) |  | (74.9) |  | (62.2)
Amount of hedged item in portfolio layer hedging relationship | 1,295.0 |  | 1,295.0 |  | $ 1,395.0
Gain (loss) from components excluded from assessment of fair value hedge effectiveness | $ 0.7 | $ (0.8) | $ 0.7 | $ (0.8) |

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