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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Millions | Jun. 30, 2024 USD ($) | Jun. 30, 2024 security | Jun. 30, 2024 | Jun. 30, 2024 position | Dec. 31, 2023 USD ($) | Dec. 31, 2023 security | Dec. 31, 2023 | Dec. 31, 2023 position
--- | --- | --- | --- | --- | --- | --- | --- | ---
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Number of positions with a gross unrealized loss, 12 Months or Less (security) | security |  | 438 |  |  |  | 195 |  |
Number of positions with a gross unrealized loss, more than 12 months (security) |  | 2,161 |  | 2,161 |  | 2,305 |  | 2,305
Number of positions with a gross unrealized loss, Total (security) | security |  | 2,599 |  |  |  | 2,500 |  |
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent) |  |  | 14.40% |  |  |  | 9.20% |
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent) |  |  | 57.80% |  |  |  | 65.20% |
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent) |  |  | 72.20% |  |  |  | 74.40% |
Fixed maturity securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 767.5 |  |  |  | $ 479.2 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 3,089.0 |  |  |  | 3,415.5 |  |  |
Fixed maturity securities, Fair Value, Total | 3,856.5 |  |  |  | 3,894.7 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 25.3 |  |  |  | 28.3 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 494.0 |  |  |  | 452.2 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 519.3 |  |  |  | 480.5 |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 81.7 |  |  |  | 45.3 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 475.2 |  |  |  | 458.5 |  |  |
Fixed maturity securities, Fair Value, Total | 556.9 |  |  |  | 503.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.8 |  |  |  | 0.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 74.6 |  |  |  | 63.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 75.4 |  |  |  | 64.6 |  |  |
Other |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 62.5 |  |  |  | 39.5 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 302.0 |  |  |  | 288.0 |  |  |
Fixed maturity securities, Fair Value, Total | 364.5 |  |  |  | 327.5 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.6 |  |  |  | 0.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 67.4 |  |  |  | 62.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 68.0 |  |  |  | 62.8 |  |  |
Municipal bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 140.9 |  |  |  | 64.5 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 700.9 |  |  |  | 724.6 |  |  |
Fixed maturity securities, Fair Value, Total | 841.8 |  |  |  | 789.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1.7 |  |  |  | 0.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 100.3 |  |  |  | 91.0 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 102.0 |  |  |  | 91.9 |  |  |
Foreign government bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0.0 |  |  |  | 1.5 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 22.0 |  |  |  | 20.6 |  |  |
Fixed maturity securities, Fair Value, Total | 22.0 |  |  |  | 22.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.0 |  |  |  | 0.0 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1.1 |  |  |  | 1.0 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 1.1 |  |  |  | 1.0 |  |  |
Corporate bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 348.4 |  |  |  | 195.0 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 1,114.1 |  |  |  | 1,171.3 |  |  |
Fixed maturity securities, Fair Value, Total | 1,462.5 |  |  |  | 1,366.3 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 21.8 |  |  |  | 25.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 220.3 |  |  |  | 194.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | 242.1 |  |  |  | 220.3 |  |  |
Other asset-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 134.0 |  |  |  | 133.4 |  |  |
Fixed maturity securities, Fair Value, More than 12 Months | 474.8 |  |  |  | 752.5 |  |  |
Fixed maturity securities, Fair Value, Total | 608.8 |  |  |  | 885.9 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.4 |  |  |  | 0.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 30.3 |  |  |  | 39.1 |  |  |
Fixed maturity securities, Gross Unrealized Losses, Total | $ 30.7 |  |  |  | $ 39.9 |  |  |

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