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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 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, July 1, 2025 |  | $ | (309.9) |  |  | $ | 99.8 |  |  | $ | (7.0) |  |  | $ | (217.1) |
Other comprehensive income (loss) before reclassifications |  | 58.7 |  |  | (20.4) |  |  | — |  |  | 38.3 |
Amounts reclassified from AOCI(2) |  | 0.4 |  |  | — |  |  | — |  |  | 0.4 |
Net current period other comprehensive income (loss) |  | 59.1 |  |  | (20.4) |  |  | — |  |  | 38.7 |
Ending balance, September 30, 2025 |  | $ | (250.8) |  |  | $ | 79.4 |  |  | $ | (7.0) |  |  | $ | (178.4) |
Beginning balance, July 1, 2024 |  | $ | (370.4) |  |  | $ | 95.3 |  |  | $ | (7.6) |  |  | $ | (282.7) |
Other comprehensive income (loss) before reclassifications |  | 132.8 |  |  | (73.5) |  |  | — |  |  | 59.3 |
Amounts reclassified from AOCI(3) |  | 0.4 |  |  | — |  |  | — |  |  | 0.4 |
Net current period other comprehensive income (loss) |  | 133.2 |  |  | (73.5) |  |  | — |  |  | 59.7 |
Ending balance, September 30, 2024 |  | $ | (237.2) |  |  | $ | 21.8 |  |  | $ | (7.6) |  |  | $ | (223.0) |
Beginning balance, January 1, 2025 |  | $ | (357.4) |  |  | $ | 110.9 |  |  | $ | (7.0) |  |  | $ | (253.5) |
Other comprehensive income (loss) before reclassifications |  | 103.1 |  |  | (31.5) |  |  | — |  |  | 71.6 |
Amounts reclassified from AOCI(2) |  | 3.5 |  |  | — |  |  | — |  |  | 3.5 |
Net current period other comprehensive income (loss) |  | 106.6 |  |  | (31.5) |  |  | — |  |  | 75.1 |
Ending balance, September 30, 2025 |  | $ | (250.8) |  |  | $ | 79.4 |  |  | $ | (7.0) |  |  | $ | (178.4) |
Beginning balance, January 1, 2024 |  | $ | (328.3) |  |  | $ | 21.9 |  |  | $ | (7.6) |  |  | $ | (314.0) |
Other comprehensive income (loss) before reclassifications |  | 88.2 |  |  | (0.1) |  |  | — |  |  | 88.1 |
Amounts reclassified from AOCI(3) |  | 2.9 |  |  | — |  |  | — |  |  | 2.9 |
Net current period other comprehensive income (loss) |  | 91.1 |  |  | (0.1) |  |  | — |  |  | 91.0 |
Ending balance, September 30, 2024 |  | $ | (237.2) |  |  | $ | 21.8 |  |  | $ | (7.6) |  |  | $ | (223.0) |
(1)All amounts are net of tax. (2)The pretax amounts reclassified from AOCI, $(0.6) million and $(4.5) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.1) million and $(0.9) million, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2025, respectively. (3)The pretax amounts reclassified from AOCI, $(0.4) million and $(3.6) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.1) million and $(0.8) million, are included in income tax expense in the Consolidated Statements of Operations for the three and nine months ended September 30, 2024, respectively.

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