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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | $ 1,086.1 | $ 988.1 | $ 2,158.3 | $ 1,974.8
Net realized capital gains (losses) | [1] | (15.2) | (72.8) | (16.1) | (138.8)
Benefits, claims and settlement expenses |  | 2,077.9 | 1,834.1 | 4,147.6 | 3,608.0
Fair Value Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 16.6 | 12.8 | 33.6 | 28.9
Fair Value Hedges | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (0.3) |  | (0.3) |
Fair Value Hedges | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (6.7) | (0.2) | (9.8) | (0.2)
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 1.5 | (22.7) | (16.2) | 3.5
Gain (loss) recognized on derivatives |  | (2.4) | 20.6 | 15.1 | (2.0)
Amortization of hedged item basis adjustments |  | 0.6 |  | 1.0 | (0.1)
Amounts related to periodic settlements on derivatives |  | 16.1 | 14.9 | 32.2 | 27.5
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | (3.5) | (2.6) | (18.3) | (2.6)
Gain (loss) recognized on derivatives |  | 2.4 | 2.5 | 18.6 | 2.5
Amounts related to periodic settlements on derivatives |  | (5.6) | (0.1) | (10.1) | (0.1)
Fair Value Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 0.8 |  | 1.5 |
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | (1.6) | 0.6 | (5.7) | 0.6
Gain (loss) recognized on derivatives |  | 1.3 | (0.6) | 5.4 | (0.6)
Cash Flow Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 7.4 | 6.2 | 14.1 | 12.7
Cash Flow Hedges | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 0.1 | 0.3 | 0.1 | 2.9
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 3.7 | 3.4 | 7.5 | 6.5
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | 0.9 | 1.0 | 1.8 | 2.1
Benefits, claims and settlement expenses |  | (0.1) | (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 |  | 0.1 | 0.3 | 0.1 | 1.7
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 3.8 | 3.5 | 7.6 | 6.6
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net realized capital gains (losses) |  |  |  |  | 1.2
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 6.5 | 5.2 | 12.3 | 10.6
Net investment hedging relationships |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | 0.8 | (0.2) | 1.5 | (0.8)
Net investment hedging relationships | Foreign exchange contracts |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | $ 0.8 | $ (0.2) | $ 1.5 | $ (0.8)
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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