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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | $ 1,162.8 | $ 1,086.1 | $ 2,328.5 | $ 2,158.3
Net realized capital gains (losses) | [1] | 5.4 | (15.2) | (111.7) | (16.1)
Benefits, claims and settlement expenses |  | 1,839.9 | 2,077.9 | 4,059.9 | 4,147.6
Fair Value Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 10.7 | 16.6 | 23.4 | 33.6
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 |  | (9.4) | (6.7) | (14.7) | (9.8)
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 15.0 | 1.5 | 42.4 | (16.2)
Gain (loss) recognized on derivatives |  | (16.4) | (2.4) | (42.5) | 15.1
Amortization of hedged item basis adjustments |  | 1.3 | 0.6 | 1.9 | 1.0
Amounts related to periodic settlements on derivatives |  | 10.0 | 16.1 | 20.1 | 32.2
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Gain (loss) recognized on hedged item |  | 16.2 | (3.5) | 51.7 | (18.3)
Gain (loss) recognized on derivatives |  | (20.6) | 2.4 | (56.6) | 18.6
Amounts related to periodic settlements on derivatives |  | (5.0) | (5.6) | (9.8) | (10.1)
Fair Value Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 0.8 | 0.8 | 1.5 | 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 |  | 17.2 | (1.6) | 25.0 | (5.7)
Gain (loss) recognized on derivatives |  | (17.2) | 1.3 | (25.0) | 5.4
Cash Flow Hedges | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 9.5 | 7.4 | 18.6 | 14.1
Cash Flow Hedges | Net realized capital gains (losses) |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  | 2.7 | 0.1 | 2.7 | 0.1
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Total gain (loss) recognized for hedging relationships |  |  | 3.7 | (0.1) | 7.5
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net investment income (loss) |  | 0.6 | 0.9 | 1.3 | 1.8
Benefits, claims and settlement expenses |  |  | (0.1) | (0.1) | (0.1)
Cash Flow Hedges | Interest rate contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | (0.2) |  | (0.3) |
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 |  | 0.1
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 |  | 7.6
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Net realized capital gains (losses) |  | 2.7 |  | 2.7 |
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amounts related to periodic settlements on derivatives |  | 9.1 | 6.5 | 17.6 | 12.3
Net investment hedging relationships |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | (2.5) | 0.8 | (3.6) | 1.5
Net investment hedging relationships | Foreign exchange contracts |  |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives |  | $ (2.5) | $ 0.8 | $ (3.6) | $ 1.5
[1] | Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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