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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2022 security | Dec. 31, 2022 | Dec. 31, 2022 position | Dec. 31, 2021 USD ($) | Dec. 31, 2021 security | Dec. 31, 2021 | Dec. 31, 2021 position
--- | --- | --- | --- | --- | --- | --- | --- | ---
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Number of positions with a gross unrealized loss, 12 months or less | security |  | 2,515 |  |  |  | 516 |  |
Number of position with a gross unrealized loss, more than 12 months |  | 587 |  | 587 |  | 122 |  | 122
Number of position with a gross unrealized loss, total | security |  | 3,102 |  |  |  | 638 |  |
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 months or less |  |  | 68.20% |  |  |  | 12.60% |
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months |  |  | 14.20% |  |  |  | 3.40% |
Fair value as a percentage of total fixed maturities and equity securities fair value, total |  |  | 82.40% |  |  |  | 16.00% |
Total |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | $ 3,533.7 |  |  |  | $ 783.4 |  |  |
Fixed maturity securities, fair value, more than 12 months | 734.2 |  |  |  | 211.9 |  |  |
Fixed maturity securities, fair value, total | 4,267.9 |  |  |  | 995.3 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 461.8 |  |  |  | 11.3 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 145.1 |  |  |  | 7.3 |  |  |
Fixed maturity securities, gross unrealized losses, total | 606.9 |  |  |  | 18.6 |  |  |
Mortgage-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 458.3 |  |  |  | 67.4 |  |  |
Fixed maturity securities, fair value, more than 12 months | 52.6 |  |  |  | 3.9 |  |  |
Fixed maturity securities, fair value, total | 510.9 |  |  |  | 71.3 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 54.4 |  |  |  | 1.3 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 14.7 |  |  |  | 0.2 |  |  |
Fixed maturity securities, gross unrealized losses, total | 69.1 |  |  |  | 1.5 |  |  |
Other |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 242.7 |  |  |  | 59.5 |  |  |
Fixed maturity securities, fair value, more than 12 months | 65.8 |  |  |  | 35.1 |  |  |
Fixed maturity securities, fair value, total | 308.5 |  |  |  | 94.6 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 34.1 |  |  |  | 1.7 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 33.7 |  |  |  | 2.6 |  |  |
Fixed maturity securities, gross unrealized losses, total | 67.8 |  |  |  | 4.3 |  |  |
Municipal bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 911.6 |  |  |  | 56.8 |  |  |
Fixed maturity securities, fair value, more than 12 months | 42.2 |  |  |  | 0.6 |  |  |
Fixed maturity securities, fair value, total | 953.8 |  |  |  | 57.4 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 113.7 |  |  |  | 0.7 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 14.4 |  |  |  | 0.0 |  |  |
Fixed maturity securities, gross unrealized losses, total | 128.1 |  |  |  | 0.7 |  |  |
Foreign government bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 32.7 |  |  |  | 0.0 |  |  |
Fixed maturity securities, fair value, more than 12 months | 0.4 |  |  |  | 0.0 |  |  |
Fixed maturity securities, fair value, total | 33.1 |  |  |  | 0.0 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 1.4 |  |  |  | 0.0 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 0.2 |  |  |  | 0.0 |  |  |
Fixed maturity securities, gross unrealized losses, total | 1.6 |  |  |  | 0.0 |  |  |
Corporate bonds |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 1,345.0 |  |  |  | 220.7 |  |  |
Fixed maturity securities, fair value, more than 12 months | 148.9 |  |  |  | 44.1 |  |  |
Fixed maturity securities, fair value, total | 1,493.9 |  |  |  | 264.8 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 221.1 |  |  |  | 3.8 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 51.1 |  |  |  | 1.4 |  |  |
Fixed maturity securities, gross unrealized losses, total | 272.2 |  |  |  | 5.2 |  |  |
Other asset-backed securities |  |  |  |  |  |  |  |
Fixed maturity securities, Fair Value |  |  |  |  |  |  |  |
Fixed maturity securities, Fair value, 12 months or less | 543.4 |  |  |  | 379.0 |  |  |
Fixed maturity securities, fair value, more than 12 months | 424.3 |  |  |  | 128.2 |  |  |
Fixed maturity securities, fair value, total | 967.7 |  |  |  | 507.2 |  |  |
Fixed maturity securities, Gross Unrealized Losses |  |  |  |  |  |  |  |
Fixed maturity securities, gross unrealized losses, 12 months or less | 37.1 |  |  |  | 3.8 |  |  |
Fixed maturity securities, gross unrealized losses, more than 12 months | 31.0 |  |  |  | 3.1 |  |  |
Fixed maturity securities, gross unrealized losses, total | $ 68.1 |  |  |  | $ 6.9 |  |  |

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