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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gains (losses) recognized for hedging relationships |  |  |  |
Net investment income (loss) |  | $ 4,091.9 | $ 3,838.5 | $ 4,429.6
Net realized capital gains (losses) | [1] | (72.2) | (182.1) | 115.4
Benefits, claims and settlement expenses |  | 7,788.2 | 6,631.3 | 7,258.2
Gains or losses on net investment hedges were reclassified from AOCI into net realized capitals gains (losses) |  | 0.0 | 0.0 | 0.0
Fair Value Hedges | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 62.5 |  |
Fair Value Hedges | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (4.3) |  |
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) recognized on hedged item |  | (43.9) | (154.4) | (28.7)
Gain (loss) recognized on derivatives |  | 45.3 | 151.6 | 28.6
Amortization of hedged item basis adjustments |  |  | (1.3) | (1.8)
Amounts related to periodic settlements on derivatives |  | 60.5 | 5.2 | (10.0)
Total gain (loss) recognized for hedging relationships |  |  | 1.1 | (11.9)
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) recognized on hedged item |  | (2.1) |  |
Gain (loss) recognized on derivatives |  | 0.4 |  |
Amounts related to periodic settlements on derivatives |  | (2.6) |  |
Fair Value Hedges | Foreign exchange contracts | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amounts related to periodic settlements on derivatives |  | 0.6 |  |
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses) |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) recognized on hedged item |  | (3.7) |  |
Gain (loss) recognized on derivatives |  | 3.7 |  |
Cash Flow Hedges | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 25.5 | 23.5 | 25.0
Cash Flow Hedges | Net realized capital gains (losses) |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 3.4 | 19.1 | 10.2
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 14.1 | 3.6 | (0.5)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net investment income (loss) |  | 4.1 | 9.0 | 15.4
Benefits, claims and settlement expenses |  | (0.1) | (0.1) | (0.1)
Cash Flow Hedges | Interest rate contracts | Net realized capital gains (losses) |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) reclassified from AOCI into net income as a result that a forecasted transaction is no longer probable of occurring |  | 1.9 | 18.5 | 1.0
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amounts related to periodic settlements on derivatives |  | 14.2 | 3.7 | (0.4)
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net realized capital gains (losses) |  | 1.5 | 0.6 | 9.2
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amounts related to periodic settlements on derivatives |  | 21.4 | 14.5 | 9.6
Net investment hedging relationships |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | (0.7) | 1.5 | 2.9
Net investment hedging relationships | Foreign exchange contracts |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | $ (0.7) | $ 1.5 | $ 2.9
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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