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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Millions | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Fixed maturity securities, Gross Unrealized Losses |  |
Number of positions with a gross unrealized loss, 12 Months or Less | security | 2,858 | 516
Number of position with a gross unrealized loss, more than 12 months | security | 197 | 122
Number of position with a gross unrealized loss, Total | security | 3,055 | 638
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 71.50% | 12.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 4.90% | 3.40%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 76.40% | 16.00%
Total |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 4,067.4 | $ 783.4
Fixed maturity securities, Fair Value, More than 12 Months | 277.0 | 211.9
Fixed maturity securities, Fair Value, Total | 4,344.4 | 995.3
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 377.9 | 11.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 47.1 | 7.3
Fixed maturity securities, Gross Unrealized Losses, Total | 425.0 | 18.6
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 478.9 | 67.4
Fixed maturity securities, Fair Value, More than 12 Months | 9.8 | 3.9
Fixed maturity securities, Fair Value, Total | 488.7 | 71.3
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 30.3 | 1.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3.5 | 0.2
Fixed maturity securities, Gross Unrealized Losses, Total | 33.8 | 1.5
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 235.9 | 59.5
Fixed maturity securities, Fair Value, More than 12 Months | 44.8 | 35.1
Fixed maturity securities, Fair Value, Total | 280.7 | 94.6
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 24.8 | 1.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 17.2 | 2.6
Fixed maturity securities, Gross Unrealized Losses, Total | 42.0 | 4.3
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 919.4 | 56.8
Fixed maturity securities, Fair Value, More than 12 Months | 1.5 | 0.6
Fixed maturity securities, Fair Value, Total | 920.9 | 57.4
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 80.4 | 0.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.4 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 80.8 | 0.7
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 14.2 | 0.0
Fixed maturity securities, Fair Value, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Fair Value, Total | 14.2 | 0.0
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.5 | 0.0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 0.5 | 0.0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 1,620.9 | 220.7
Fixed maturity securities, Fair Value, More than 12 Months | 68.2 | 44.1
Fixed maturity securities, Fair Value, Total | 1,689.1 | 264.8
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 199.6 | 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 14.6 | 1.4
Fixed maturity securities, Gross Unrealized Losses, Total | 214.2 | 5.2
Other asset-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 798.1 | 379.0
Fixed maturity securities, Fair Value, More than 12 Months | 152.7 | 128.2
Fixed maturity securities, Fair Value, Total | 950.8 | 507.2
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 42.3 | 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 11.4 | 3.1
Fixed maturity securities, Gross Unrealized Losses, Total | $ 53.7 | $ 6.9

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