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Accumulated Other Comprehensive Income | 3 Months Ended
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Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income Certain amounts included in the consolidated statements of comprehensive income are net of reclassification adjustments. 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) |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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