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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | $ 1,200.5 | $ 1,167.6 | $ 3,529.0 | $ 3,325.9
Net realized capital gains (losses) | [1] | 85.7 | 77.4 | (26.0) | 61.3
Benefits, claims and settlement expenses |  | 1,964.1 | 1,778.1 | 6,024.0 | 5,925.7
Fair Value Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 10.5 | 20.0 | 33.9 | 53.6
Fair Value Hedges | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  |  | 0.3 |  |
Fair Value Hedges | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (2.1) | (4.3) | (16.8) | (14.1)
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 7.0 | 49.2 | 49.4 | 33.0
Gain (loss) recognized on derivatives |  | (7.2) | (45.6) | (49.7) | (30.5)
Amortization of hedged item basis adjustments |  | 0.9 | 0.7 | 2.8 | 1.7
Amounts related to periodic settlements on derivatives |  | 9.0 | 14.9 | 29.1 | 47.1
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 6.6 | 47.4 | 58.3 | 29.1
Gain (loss) recognized on derivatives |  | (3.1) | (44.9) | (59.7) | (26.3)
Amounts related to periodic settlements on derivatives |  | (5.6) | (6.8) | (15.4) | (16.9)
Fair Value Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 0.8 | 0.8 | 2.3 | 2.3
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 0.2 | 8.0 | 25.2 | 2.3
Gain (loss) recognized on derivatives |  | (0.2) | (7.7) | (25.2) | (2.3)
Cash Flow Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Benefits, claims and settlement expenses |  | (0.1) |  |  |
Total gain (loss) recognized for hedging relationships |  | 8.7 | 7.7 | 27.3 | 21.8
Cash Flow Hedges | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (0.1) | 0.1 | 2.6 | 0.2
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  |  | 2.2 | (0.2) | 9.7
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | 0.6 | 0.8 | 1.9 | 2.6
Benefits, claims and settlement expenses |  | (0.1) |  | (0.2) | (0.1)
Cash Flow Hedges | Interest rate contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | (0.1) |  | (0.4) |
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 | 0.4
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  |  | 2.2 |  | 9.8
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net realized capital gains (losses) |  | (0.2) | (0.2) | 2.5 | (0.2)
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | $ 8.2 | 6.9 | 25.8 | 19.2
Net investment hedging relationships |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  |  | (1.3) | (3.6) | 0.2
Net investment hedging relationships | Foreign exchange contracts |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  |  | $ (1.3) | $ (3.6) | $ 0.2
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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