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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Components of our accumulated other comprehensive income (loss), after tax, and related changes are as follows:
| Net Unrealized Loss on Securities |  | Effect of Change in Discount Rate Assumptions on the LFPB 1 |  | Net Loss on Derivatives |  | Foreign Currency Translation Adjustment |  | Unrecognized Pension and Postretirement Benefit Costs |  | Total
| (in millions of dollars)
Balance at June 30, 2025 | $ | (2,253.7) |  |  | $ | 1,058.9 |  |  | $ | (285.0) |  |  | $ | (220.7) |  |  | $ | (340.2) |  |  | $ | (2,040.7) |
Other Comprehensive Income (Loss) Before Reclassifications | 375.8 |  |  | (402.3) |  |  | 20.9 |  |  | (25.4) |  |  | 1.6 |  |  | (29.4) |
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss | (100.3) |  |  | — |  |  | (0.1) |  |  | — |  |  | 3.2 |  |  | (97.2) |
Net Other Comprehensive Income (Loss) | 275.5 |  |  | (402.3) |  |  | 20.8 |  |  | (25.4) |  |  | 4.8 |  |  | (126.6) |
Balance at September 30, 2025 | $ | (1,978.2) |  |  | $ | 656.6 |  |  | $ | (264.2) |  |  | $ | (246.1) |  |  | $ | (335.4) |  |  | $ | (2,167.3) |
Balance at June 30, 2024 | $ | (2,723.8) |  |  | $ | 712.3 |  |  | $ | (164.6) |  |  | $ | (328.4) |  |  | $ | (341.7) |  |  | $ | (2,846.2) |
Other Comprehensive Income (Loss) Before Reclassifications | 1,225.8 |  |  | (1,239.3) |  |  | 58.8 |  |  | 68.5 |  |  | (4.2) |  |  | 109.6 |
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss | 6.8 |  |  | — |  |  | (3.1) |  |  | — |  |  | 3.2 |  |  | 6.9 |
Net Other Comprehensive Income (Loss) | 1,232.6 |  |  | (1,239.3) |  |  | 55.7 |  |  | 68.5 |  |  | (1.0) |  |  | 116.5 |
Balance at September 30, 2024 | $ | (1,491.2) |  |  | $ | (527.0) |  |  | $ | (108.9) |  |  | $ | (259.9) |  |  | $ | (342.7) |  |  | $ | (2,729.7) |
Balance at December 31, 2024 | $ | (2,755.2) |  |  | $ | 1,185.4 |  |  | $ | (270.7) |  |  | $ | (343.0) |  |  | $ | (340.2) |  |  | $ | (2,523.7) |
Other Comprehensive Income (Loss) Before Reclassifications | 695.0 |  |  | (528.8) |  |  | 10.1 |  |  | 96.9 |  |  | (4.8) |  |  | 268.4 |
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss | 82.0 |  |  | — |  |  | (3.6) |  |  | — |  |  | 9.6 |  |  | 88.0 |
Net Other Comprehensive Income (Loss) | 777.0 |  |  | (528.8) |  |  | 6.5 |  |  | 96.9 |  |  | 4.8 |  |  | 356.4 |
Balance at September 30, 2025 | $ | (1,978.2) |  |  | $ | 656.6 |  |  | $ | (264.2) |  |  | $ | (246.1) |  |  | $ | (335.4) |  |  | $ | (2,167.3) |
Balance at December 31, 2023 | $ | (1,919.1) |  |  | $ | (648.4) |  |  | $ | (73.7) |  |  | $ | (321.1) |  |  | $ | (345.7) |  |  | $ | (3,308.0) |
Other Comprehensive Income (Loss) Before Reclassifications | 401.1 |  |  | 121.4 |  |  | (24.3) |  |  | 61.2 |  |  | (6.6) |  |  | 552.8 |
Amounts Reclassified from Accumulated Other Comprehensive Income or Loss | 26.8 |  |  | — |  |  | (10.9) |  |  | — |  |  | 9.6 |  |  | 25.5 |
Net Other Comprehensive Income (Loss) | 427.9 |  |  | 121.4 |  |  | (35.2) |  |  | 61.2 |  |  | 3.0 |  |  | 578.3 |
Balance at September 30, 2024 | $ | (1,491.2) |  |  | $ | (527.0) |  |  | $ | (108.9) |  |  | $ | (259.9) |  |  | $ | (342.7) |  |  | $ | (2,729.7) |
1 Liability for Future Policy Benefits |  |  |  |  |  |  |  |  |  |  |
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from accumulated other comprehensive loss were recognized in our consolidated statements of income as follows:
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (in millions of dollars)
Net Unrealized Loss on Securities |  |  |  |  |  |  |  |
Net Investment Gain (Loss) on Fixed Maturity Securities |  |  |  |  |  |  |  |
Net Gain (Loss) on Sales |  | $ | 127.7 |  |  | $ | (7.4) |  |  | $ | 69.5 |  |  | $ | (28.6) |
Impairment Loss |  | — |  |  | (1.3) |  |  | (160.9) |  |  | (2.5) |
Change in Allowance for Credit Losses |  | (0.8) |  |  | (0.2) |  |  | (12.4) |  |  | (3.1) |
|  | 126.9 |  |  | (8.9) |  |  | (103.8) |  |  | (34.2) |
Income Tax Expense (Benefit) |  | 26.6 |  |  | (2.1) |  |  | (21.8) |  |  | (7.4) |
Total |  | $ | 100.3 |  |  | $ | (6.8) |  |  | $ | (82.0) |  |  | $ | (26.8) |
Net Loss on Derivatives |  |  |  |  |  |  |  |
Net Investment Income |  |  |  |  |  |  |  |
Gain on Interest Rate Swaps and Forwards |  | $ | 1.1 |  |  | $ | 3.4 |  |  | $ | 5.8 |  |  | $ | 13.8 |
Loss on Foreign Currency Interest Rate Swaps |  | — |  |  | — |  |  | — |  |  | (0.1) |
Net Investment Gain (Loss) |  |  |  |  |  |  |  |
Loss on Interest Rate Swaps and Forwards |  | (0.9) |  |  | — |  |  | (0.9) |  |  | — |
Gain (Loss) on Foreign Currency Interest Rate Swaps |  | (0.1) |  |  | 0.6 |  |  | (0.4) |  |  | 0.1 |
|  | 0.1 |  |  | 4.0 |  |  | 4.5 |  |  | 13.8 |
Income Tax Expense |  | — |  |  | 0.9 |  |  | 0.9 |  |  | 2.9 |
Total |  | $ | 0.1 |  |  | $ | 3.1 |  |  | $ | 3.6 |  |  | $ | 10.9 |
Unrecognized Pension and Postretirement Benefit Costs |  |  |  |  |  |  |  |
Other Expenses |  |  |  |  |  |  |  |
Amortization of Net Actuarial Loss |  | $ | (4.2) |  |  | $ | (4.2) |  |  | $ | (12.4) |  |  | $ | (12.4) |
Amortization of Prior Service Credit |  | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |
|  | (4.1) |  |  | (4.1) |  |  | (12.2) |  |  | (12.2) |
Income Tax Benefit |  | (0.9) |  |  | (0.9) |  |  | (2.6) |  |  | (2.6) |
Total |  | $ | (3.2) |  |  | $ | (3.2) |  |  | $ | (9.6) |  |  | $ | (9.6) |

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