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Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Schedule of Components of Comprehensive Income (Loss) | The components of comprehensive income (loss) were as follows (in millions, 2022 recast for the adoption of LDTI):
($ in millions) |  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Net income |  | $ | 102.8 |  |  | $ | 45.0 |  |  | $ | 19.8 |
Other comprehensive income (loss): |  |  |  |  |  |
Change in net unrealized investment gains (losses) on fixed maturity securities: |  |  |  |  |  |
Net unrealized investment gains (losses) on securities arising during the period |  | (58.0) |  |  | 133.9 |  |  | (1,042.6) |
Less: reclassification adjustment for net investment gains (losses) included in income before income tax |  | (21.1) |  |  | (20.3) |  |  | (29.1) |
Total, before tax |  | (36.9) |  |  | 154.2 |  |  | (1,013.5) |
Income tax expense (benefit) |  | (7.8) |  |  | 32.9 |  |  | (216.8) |
Total, net of tax |  | (29.1) |  |  | 121.3 |  |  | (796.7) |
Change in net reserve remeasurements attributable to discount rates: |  |  |  |  |  |
Total, before tax |  | 113.2 |  |  | (47.2) |  |  | 567.6 |
Income tax expense (benefit) |  | 24.2 |  |  | (10.1) |  |  | 121.7 |
Total, net of tax |  | 89.0 |  |  | (37.1) |  |  | 445.9 |
Change in net funded status of benefit plans: |  |  |  |  |  |
Total, before tax |  | 0.7 |  |  | 1.5 |  |  | 1.8 |
Income tax expense (benefit) |  | 0.1 |  |  | 0.3 |  |  | 0.4 |
Total, net of tax |  | 0.6 |  |  | 1.2 |  |  | 1.4 |
Total comprehensive income (loss) |  | $ | 163.3 |  |  | $ | 130.4 |  |  | $ | (329.6) |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table reconciles the components of AOCI for the periods indicated (2022 recast for the adoption of LDTI)
($ in millions) |  | Net Unrealized Investment Gains (Losses) on Securities(1)(2) |  | 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 |  | (45.8) |  |  | 89.0 |  |  | 0.6 |  |  | 43.8 |
Amounts reclassified from AOCI |  | 16.7 |  |  | — |  |  | — |  |  | 16.7 |
Net current period other comprehensive income (loss) |  | (29.1) |  |  | 89.0 |  |  | 0.6 |  |  | 60.5 |
Ending balance, December 31, 2024 |  | $ | (357.4) |  |  | $ | 110.9 |  |  | $ | (7.0) |  |  | $ | (253.5) |
Beginning balance, January 1, 2023 |  | $ | (449.6) |  |  | $ | 59.0 |  |  | $ | (8.8) |  |  | $ | (399.4) |
Other comprehensive income (loss) before reclassifications |  | 105.3 |  |  | (37.1) |  |  | 1.2 |  |  | 69.4 |
Amounts reclassified from AOCI |  | 16.0 |  |  | — |  |  | — |  |  | 16.0 |
Net current period other comprehensive income (loss) |  | 121.3 |  |  | (37.1) |  |  | 1.2 |  |  | 85.4 |
Ending balance, December 31, 2023 |  | $ | (328.3) |  |  | $ | 21.9 |  |  | $ | (7.6) |  |  | $ | (314.0) |
Beginning balance, January 1, 2022 |  | $ | 347.1 |  |  | $ | (386.9) |  |  | $ | (10.2) |  |  | $ | (50.0) |
Other comprehensive income (loss) before reclassifications |  | (819.7) |  |  | 445.9 |  |  | 1.4 |  |  | (372.4) |
Amounts reclassified from AOCI |  | 23.0 |  |  | — |  |  | — |  |  | 23.0 |
Net current period other comprehensive income (loss) |  | (796.7) |  |  | 445.9 |  |  | 1.4 |  |  | (349.4) |
Ending balance, December 31, 2022 |  | $ | (449.6) |  |  | $ | 59.0 |  |  | $ | (8.8) |  |  | $ | (399.4) |
(1) All amounts are net of tax. (2) The pretax amounts reclassified from AOCI, $(21.1) million, $(20.3) million and $(29.1) million, are included in net investment gains (losses) and the related income tax expense (benefit), $(4.4) million, $(4.3) million and $(6.1) million, are included in income tax expense (benefit) in the Consolidated Statements of Operations and Comprehensive Income (Loss) for the years ended December 31, 2024, 2023 and 2022, respectively.

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