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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Components of AOCI, 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 December 31, 2022 |  | $ | (3,028.4) |  |  | $ | 313.9 |  |  | $ | (9.6) |  |  | $ | (390.1) |  |  | $ | (334.1) |  |  | $ | (3,448.3) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 1,069.3 |  |  | (962.3) |  |  | (37.4) |  |  | 69.0 |  |  | (16.9) |  |  | 121.7 |
Amounts Reclassified from AOCI |  | 40.0 |  |  | — |  |  | (26.7) |  |  | — |  |  | 5.3 |  |  | 18.6 |
Net Other Comprehensive Income (Loss) |  | 1,109.3 |  |  | (962.3) |  |  | (64.1) |  |  | 69.0 |  |  | (11.6) |  |  | 140.3 |
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 |  | (870.4) |  |  | 1,833.8 |  |  | (184.4) |  |  | (21.9) |  |  | (7.4) |  |  | 749.7 |
Amounts Reclassified from AOCI |  | 34.3 |  |  | — |  |  | (12.6) |  |  | — |  |  | 12.9 |  |  | 34.6 |
Net Other Comprehensive Income (Loss) |  | (836.1) |  |  | 1,833.8 |  |  | (197.0) |  |  | (21.9) |  |  | 5.5 |  |  | 784.3 |
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 |  | 655.9 |  |  | (255.5) |  |  | (4.1) |  |  | 97.4 |  |  | 35.7 |  |  | 529.4 |
Amounts Reclassified from AOCI |  | 96.2 |  |  | — |  |  | (4.0) |  |  | — |  |  | 93.6 |  |  | 185.8 |
Net Other Comprehensive Income (Loss) |  | 752.1 |  |  | (255.5) |  |  | (8.1) |  |  | 97.4 |  |  | 129.3 |  |  | 715.2 |
Balance at December 31, 2025 |  | $ | (2,003.1) |  |  | $ | 929.9 |  |  | $ | (278.8) |  |  | $ | (245.6) |  |  | $ | (210.9) |  |  | $ | (1,808.5) |
1 Liability for Future Policy Benefits
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amounts reclassified from AOCI were recognized in our consolidated statements of income as follows:
|  | Year Ended December 31
|  | 2025 |  | 2024 |  | 2023
|  | (in millions of dollars)
Net Unrealized Loss on Securities |  |  |  |  |  |
Net Investment Loss on Fixed Maturity Securities |  |  |  |  |  |
Net Gain (Loss) on Sales |  | $ | 41.5 |  |  | $ | (38.2) |  |  | $ | (48.7) |
Impairment Loss |  | (160.9) |  |  | (2.5) |  |  | — |
Change in Allowance for Credit Losses 1 |  | (3.1) |  |  | (3.0) |  |  | (2.2) |
|  | (122.5) |  |  | (43.7) |  |  | (50.9) |
Income Tax Benefit |  | (26.3) |  |  | (9.4) |  |  | (10.9) |
Total |  | $ | (96.2) |  |  | $ | (34.3) |  |  | $ | (40.0) |
Net Loss on Derivatives |  |  |  |  |  |
Net Investment Income |  |  |  |  |  |
Gain on Interest Rate Swaps and Forwards |  | $ | 6.7 |  |  | $ | 16.4 |  |  | $ | 34.7 |
Loss on Foreign Currency Interest Rate Swaps |  | (0.1) |  |  | (0.2) |  |  | (0.5) |
Net Investment Loss |  |  |  |  |  |
Loss on Interest Rate Swaps and Forwards |  | (0.9) |  |  | — |  |  | — |
Loss on Foreign Currency Interest Rate Swaps |  | (0.6) |  |  | (0.2) |  |  | (0.4) |
|  | 5.1 |  |  | 16.0 |  |  | 33.8 |
Income Tax Expense |  | 1.1 |  |  | 3.4 |  |  | 7.1 |
Total |  | $ | 4.0 |  |  | $ | 12.6 |  |  | $ | 26.7 |
Unrecognized Pension and Postretirement Benefit Costs |  |  |  |  |  |
Other Expenses |  |  |  |  |  |
Amortization of Net Actuarial Loss |  | $ | (16.6) |  |  | $ | (16.4) |  |  | $ | (7.2) |
Amortization of Prior Service Credit |  | 0.3 |  |  | 0.1 |  |  | 0.2 |
Settlement Loss |  | (103.8) |  |  | — |  |  | — |
|  | (120.1) |  |  | (16.3) |  |  | (7.0) |
Income Tax Benefit |  | (26.5) |  |  | (3.4) |  |  | (1.7) |
Total |  | $ | (93.6) |  |  | $ | (12.9) |  |  | $ | (5.3) |

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