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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | 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.

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