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Accumulated Other Comprehensive Income (Loss) | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) AOCI represents the accumulated change in shareholders’ equity from transactions and other events and circumstances from non-shareholder sources. For the Company, AOCI includes the after tax change in net unrealized investment gains (losses) on fixed maturity securities, the after tax change in net reserve remeasurements attributable to discount rates and the after tax change in net funded status of benefit plans for the periods as shown in the Consolidated Statements of Changes in Shareholders’ Equity. The following table reconciles these components.
($ in millions) |  | Net Unrealized Investment Gains (Losses) on Fixed Maturity Securities(1) |  | Net Reserve Remeasurements Attributable to Discount Rates(1) |  | Net Funded Status of Benefit Plans(1) |  | Total(1)
Beginning balance, April 1, 2025 |  | $ | (314.5) |  |  | $ | 99.1 |  |  | $ | (7.0) |  |  | $ | (222.4) |
Other comprehensive income (loss) before reclassifications |  | 1.4 |  |  | 0.7 |  |  | — |  |  | 2.1 |
Amounts reclassified from AOCI(2) |  | 3.2 |  |  | — |  |  | — |  |  | 3.2 |
Net current period other comprehensive income (loss) |  | 4.6 |  |  | 0.7 |  |  | — |  |  | 5.3 |
Ending balance, June 30, 2025 |  | $ | (309.9) |  |  | $ | 99.8 |  |  | $ | (7.0) |  |  | $ | (217.1) |
Beginning balance, April 1, 2024 |  | $ | (348.0) |  |  | $ | 63.3 |  |  | $ | (7.6) |  |  | $ | (292.3) |
Other comprehensive income (loss) before reclassifications |  | (24.1) |  |  | 32.0 |  |  | — |  |  | 7.9 |
Amounts reclassified from AOCI(3) |  | 1.7 |  |  | — |  |  | — |  |  | 1.7 |
Net current period other comprehensive income (loss) |  | (22.4) |  |  | 32.0 |  |  | — |  |  | 9.6 |
Ending balance, June 30, 2024 |  | $ | (370.4) |  |  | $ | 95.3 |  |  | $ | (7.6) |  |  | $ | (282.7) |
Beginning balance, January 1, 2025 |  | $ | (357.4) |  |  | $ | 110.9 |  |  | $ | (7.0) |  |  | $ | (253.5) |
Other comprehensive income (loss) before reclassifications |  | 44.4 |  |  | (11.1) |  |  | — |  |  | 33.3 |
Amounts reclassified from AOCI(2) |  | 3.1 |  |  | — |  |  | — |  |  | 3.1 |
Net current period other comprehensive income (loss) |  | 47.5 |  |  | (11.1) |  |  | — |  |  | 36.4 |
Ending balance, June 30, 2025 |  | $ | (309.9) |  |  | $ | 99.8 |  |  | $ | (7.0) |  |  | $ | (217.1) |
Beginning balance, January 1, 2024 |  | $ | (328.3) |  |  | $ | 21.9 |  |  | $ | (7.6) |  |  | $ | (314.0) |
Other comprehensive income (loss) before reclassifications |  | (44.6) |  |  | 73.4 |  |  | — |  |  | 28.8 |
Amounts reclassified from AOCI(3) |  | 2.5 |  |  | — |  |  | — |  |  | 2.5 |
Net current period other comprehensive income (loss) |  | (42.1) |  |  | 73.4 |  |  | — |  |  | 31.3 |
Ending balance, June 30, 2024 |  | $ | (370.4) |  |  | $ | 95.3 |  |  | $ | (7.6) |  |  | $ | (282.7) |
(1)All amounts are net of tax. (2)The pretax amounts reclassified from AOCI, $(4.1) million and $(3.9) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.9) million and $(0.8) million, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2025, respectively. (3)The pretax amounts reclassified from AOCI, $(2.2) million and $(3.2) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.5) million and $(0.7) million, are included in income tax expense in the Consolidated Statements of Operations for the three and six months ended June 30, 2024, respectively. Comparative information for elements that are not required to be reclassified in their entirety to net income (loss) in the same reporting period is disclosed in Note 2.

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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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