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Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Income, Net of Tax | The following tables summarize those reclassification adjustments (net of taxes) for the periods indicated:
| Three Months Ended March 31, 2026
| Foreign currency translation adjustment |  | Net unrealized losses on investments |  | Net unrealized gains on derivative transactions |  | Unamortized net losses on Pension Plans |  | Accumulated other comprehensive loss
Balance at December 31, 2025 | $ | (351.5) |  |  | $ | (63.0) |  |  | $ | 1.8 |  |  | $ | (131.5) |  |  | $ | (544.2) |
Change in accumulated other comprehensive income (loss) before reclassifications | 5.5 |  |  | (101.7) |  |  | (0.5) |  |  | (0.4) |  |  | (97.1) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 12.1 |  |  | (0.4) |  |  | 0.6 |  |  | 12.3 |
Net current-period other comprehensive income (loss) | 5.5 |  |  | (89.6) |  |  | (0.9) |  |  | 0.2 |  |  | (84.8) |
Balance at March 31, 2026 | $ | (346.0) |  |  | $ | (152.6) |  |  | $ | 0.9 |  |  | $ | (131.3) |  |  | $ | (629.0) |
| Three Months Ended March 31, 2025
| Foreign currency translation adjustment |  | Net unrealized losses on investments |  | Net unrealized gains on derivative transactions |  | Unamortized net losses on Pension Plans |  | Accumulated other comprehensive loss
Balance at December 31, 2024 | $ | (415.2) |  |  | $ | (291.9) |  |  | $ | 2.2 |  |  | $ | (131.2) |  |  | $ | (836.1) |
Change in accumulated other comprehensive income (loss) before reclassifications | 8.8 |  |  | 61.8 |  |  | 1.7 |  |  | — |  |  | 72.3 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 13.4 |  |  | (0.3) |  |  | 2.2 |  |  | 15.3 |
Net current-period other comprehensive income (loss) | 8.8 |  |  | 75.2 |  |  | 1.4 |  |  | 2.2 |  |  | 87.6 |
Balance at March 31, 2025 | $ | (406.4) |  |  | $ | (216.7) |  |  | $ | 3.6 |  |  | $ | (129.0) |  |  | $ | (748.5) |
Schedule of Reclassification out of Accumulated Other Comprehensive Income | The following tables summarize the reclassifications out of AOCI for the periods indicated:
Details about accumulated other comprehensive income components |  | Amount reclassified from accumulated other comprehensive income | Affected line item in the statement where net income is presented
|  | Three Months Ended March 31, |  |  |
|  | 2026 |  | 2025 |  |  |  |  |
Net unrealized losses on investments |  | $ | 15.3 |  |  | $ | 17.0 |  |  |  |  |  | Net realized losses on investments and fair value changes to equity securities
|  | (3.2) |  |  | (3.6) |  |  |  |  |  | Provision for income taxes
|  | $ | 12.1 |  |  | $ | 13.4 |  |  |  |  |  | Net of tax
Net unrealized (gains) losses on derivative transactions related to: |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | (0.5) |  |  | $ | (0.7) |  |  |  |  |  | Interest expense
Foreign exchange derivatives |  | — |  |  | 0.3 |  |  |  |  |  | Underwriting, selling, general and administrative expenses
|  | (0.5) |  |  | (0.4) |  |  |  |  |  |
|  | 0.1 |  |  | 0.1 |  |  |  |  |  | Provision for income taxes
|  | $ | (0.4) |  |  | $ | (0.3) |  |  |  |  |  | Net of tax
Amortization of pension and postretirement unrecognized net periodic benefit cost: |  |  |  |  |  |  |  |  |
Amortization of net loss |  | $ | 0.7 |  |  | $ | 0.3 |  |  |  |  |  | (1)
Settlement loss |  | — |  |  | 2.5 |  |  |  |  |  | (1)
|  | 0.7 |  |  | 2.8 |  |  |  |  |  |
|  | (0.1) |  |  | (0.6) |  |  |  |  |  | Provision for income taxes
|  | $ | 0.6 |  |  | $ | 2.2 |  |  |  |  |  | Net of tax
Total reclassifications for the period |  | $ | 12.3 |  |  | $ | 15.3 |  |  |  |  |  | Net of tax
(1)These AOCI components are included in the computation of net periodic pension cost. For additional information, see Note 13.

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