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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2023 security | Dec. 31, 2023 | Dec. 31, 2023 position | Dec. 31, 2022 USD ($) | Dec. 31, 2022 security | Dec. 31, 2022 | Dec. 31, 2022 position
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Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Number of positions with a gross unrealized loss, 12 Months or Less (security) | security |  | 195 |  |  |  | 2,515 |  |
Number of positions with a gross unrealized loss, more than 12 months (security) |  | 2,305 |  | 2,305 |  | 587 |  | 587
Number of position with a gross unrealized loss, total | security |  | 2,500 |  |  |  | 3,102 |  |
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent) |  |  | 9.20% |  |  |  | 68.20% |
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent) |  |  | 65.20% |  |  |  | 14.20% |
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent) |  |  | 74.40% |  |  |  | 82.40% |
Fixed maturity securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 479.2 |  |  |  | $ 3,533.7 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 3,415.5 |  |  |  | 734.2 |  |  |
Fixed maturity securities, fair value, total | 3,894.7 |  |  |  | 4,267.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 28.3 |  |  |  | 461.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 452.2 |  |  |  | 145.1 |  |  |
Fixed maturity securities, gross unrealized losses, total | 480.5 |  |  |  | 606.9 |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 45.3 |  |  |  | 458.3 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 458.5 |  |  |  | 52.6 |  |  |
Fixed maturity securities, fair value, total | 503.8 |  |  |  | 510.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.8 |  |  |  | 54.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 63.8 |  |  |  | 14.7 |  |  |
Fixed maturity securities, gross unrealized losses, total | 64.6 |  |  |  | 69.1 |  |  |
Other |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 39.5 |  |  |  | 242.7 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 288.0 |  |  |  | 65.8 |  |  |
Fixed maturity securities, fair value, total | 327.5 |  |  |  | 308.5 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.4 |  |  |  | 34.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 62.4 |  |  |  | 33.7 |  |  |
Fixed maturity securities, gross unrealized losses, total | 62.8 |  |  |  | 67.8 |  |  |
Municipal bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 64.5 |  |  |  | 911.6 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 724.6 |  |  |  | 42.2 |  |  |
Fixed maturity securities, fair value, total | 789.1 |  |  |  | 953.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.9 |  |  |  | 113.7 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 91.0 |  |  |  | 14.4 |  |  |
Fixed maturity securities, gross unrealized losses, total | 91.9 |  |  |  | 128.1 |  |  |
Foreign government bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 1.5 |  |  |  | 32.7 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 20.6 |  |  |  | 0.4 |  |  |
Fixed maturity securities, fair value, total | 22.1 |  |  |  | 33.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.0 |  |  |  | 1.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1.0 |  |  |  | 0.2 |  |  |
Fixed maturity securities, gross unrealized losses, total | 1.0 |  |  |  | 1.6 |  |  |
Corporate bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 195.0 |  |  |  | 1,345.0 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 1,171.3 |  |  |  | 148.9 |  |  |
Fixed maturity securities, fair value, total | 1,366.3 |  |  |  | 1,493.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 25.4 |  |  |  | 221.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 194.9 |  |  |  | 51.1 |  |  |
Fixed maturity securities, gross unrealized losses, total | 220.3 |  |  |  | 272.2 |  |  |
Other asset-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 133.4 |  |  |  | 543.4 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 752.5 |  |  |  | 424.3 |  |  |
Fixed maturity securities, fair value, total | 885.9 |  |  |  | 967.7 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.8 |  |  |  | 37.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 39.1 |  |  |  | 31.0 |  |  |
Fixed maturity securities, gross unrealized losses, total | $ 39.9 |  |  |  | $ 68.1 |  |  |

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