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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
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, January 1, 2024 |  | $ | (328.3) |  |  | $ | 21.9 |  |  | $ | (7.6) |  |  | $ | (314.0) |
Other comprehensive income (loss) before reclassifications |  | (20.5) |  |  | 41.4 |  |  | — |  |  | 20.9 |
Amounts reclassified from AOCI(2) |  | 0.8 |  |  | — |  |  | — |  |  | 0.8 |
Net current period other comprehensive income (loss) |  | (19.7) |  |  | 41.4 |  |  | — |  |  | 21.7 |
Ending balance, March 31, 2024 |  | $ | (348.0) |  |  | $ | 63.3 |  |  | $ | (7.6) |  |  | $ | (292.3) |
Beginning balance, January 1, 2023 |  | $ | (449.6) |  |  | $ | 59.0 |  |  | $ | (8.8) |  |  | $ | (399.4) |
Other comprehensive income (loss) before reclassifications |  | 91.3 |  |  | (41.2) |  |  | — |  |  | 50.1 |
Amounts reclassified from AOCI(2) |  | 1.9 |  |  | — |  |  | — |  |  | 1.9 |
Net current period other comprehensive income (loss) |  | 93.2 |  |  | (41.2) |  |  | — |  |  | 52.0 |
Ending balance, March 31, 2023 |  | $ | (356.4) |  |  | $ | 17.8 |  |  | $ | (8.8) |  |  | $ | (347.4) |
(1)All amounts are net of tax. (2)The pretax amounts reclassified from AOCI, $(1.0) million and $(2.4) million, are included in Net investment gains (losses) and the related income tax benefits, $(0.2) million and $(0.5) million, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2024 and 2023, respectively.

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