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Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | $ 1,175.3 | $ 1,098.3 | [1] |  |
Other comprehensive income (loss) before reclassifications | 43.8 | 69.4 |  | $ (372.4) |
Amounts reclassified from AOCI | 16.7 | 16.0 |  | 23.0 |
Net current period other comprehensive income (loss) | 60.5 | 85.4 |  | (349.4) | [2]
Net current period other comprehensive income (loss) |  |  |  | (349.4) |
Ending balance | 1,287.5 | 1,175.3 |  | 1,098.3 | [1]
Reclassification adjustment for net investment gains (losses) included in income before income tax | (21.1) | (20.3) |  | (29.1) |
Other tax expense (benefit) | (4.4) | (4.3) |  | (6.1) |
Total |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (314.0) | (399.4) | [1] | (50.0) | [1]
Ending balance | (253.5) | (314.0) |  | (399.4) | [1]
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (328.3) | (449.6) |  | 347.1 |
Other comprehensive income (loss) before reclassifications | (45.8) | 105.3 |  | (819.7) |
Amounts reclassified from AOCI | 16.7 | 16.0 |  | 23.0 |
Net current period other comprehensive income (loss) | (29.1) | 121.3 |  |  |
Net current period other comprehensive income (loss) |  |  |  | (796.7) |
Ending balance | (357.4) | (328.3) |  | (449.6) |
Net Reserve Remeasurements Attributable to Discount Rates |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | 21.9 | 59.0 |  | (386.9) |
Other comprehensive income (loss) before reclassifications | 89.0 | (37.1) |  | 445.9 |
Amounts reclassified from AOCI | 0.0 | 0.0 |  | 0.0 |
Net current period other comprehensive income (loss) | 89.0 | (37.1) |  |  |
Net current period other comprehensive income (loss) |  |  |  | 445.9 |
Ending balance | 110.9 | 21.9 |  | 59.0 |
Net Funded Status of Benefit Plans |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | (7.6) | (8.8) |  | (10.2) |
Other comprehensive income (loss) before reclassifications | 0.6 | 1.2 |  | 1.4 |
Amounts reclassified from AOCI | 0.0 | 0.0 |  | 0.0 |
Net current period other comprehensive income (loss) | 0.6 | 1.2 |  |  |
Net current period other comprehensive income (loss) |  |  |  | 1.4 |
Ending balance | $ (7.0) | $ (7.6) |  | $ (8.8) |
[1] | Recast for the adoption of ASU 2018-12.
[2] | Recast for the adoption of ASU 2018-12.

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