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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Millions | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Fixed maturity securities, Gross Unrealized Losses |  |
Number of positions with a gross unrealized loss, 12 Months or Less | security | 516 | 308
Number of position with a gross unrealized loss, more than 12 months | security | 122 | 123
Number of position with a gross unrealized loss, Total | security | 638 | 431
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 12.60% | 8.90%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 3.40% | 6.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 16.00% | 15.60%
Total |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 783.4 | $ 562.4
Fixed maturity securities, Fair Value, More than 12 Months | 211.9 | 422.8
Fixed maturity securities, Fair Value, Total | 995.3 | 985.2
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 11.3 | 22.5
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7.3 | 5.9
Fixed maturity securities, Gross Unrealized Losses, Total | 18.6 | 28.4
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 67.4 | 4.9
Fixed maturity securities, Fair Value, More than 12 Months | 3.9 | 2.6
Fixed maturity securities, Fair Value, Total | 71.3 | 7.5
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1.3 | 0.1
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.2 | 0.2
Fixed maturity securities, Gross Unrealized Losses, Total | 1.5 | 0.3
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 59.5 | 95.9
Fixed maturity securities, Fair Value, More than 12 Months | 35.1 | 0.0
Fixed maturity securities, Fair Value, Total | 94.6 | 95.9
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1.7 | 1.0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 2.6 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 4.3 | 1.0
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 56.8 | 18.1
Fixed maturity securities, Fair Value, More than 12 Months | 0.6 | 0.0
Fixed maturity securities, Fair Value, Total | 57.4 | 18.1
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0.7 | 0.5
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 0.7 | 0.5
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0.0 | 0.0
Fixed maturity securities, Fair Value, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Fair Value, Total | 0.0 | 0.0
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 | 0.0 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 0.0 | 0.0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 220.7 | 126.6
Fixed maturity securities, Fair Value, More than 12 Months | 44.1 | 10.9
Fixed maturity securities, Fair Value, Total | 264.8 | 137.5
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 3.8 | 3.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1.4 | 0.2
Fixed maturity securities, Gross Unrealized Losses, Total | 5.2 | 3.9
Other asset-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 379.0 | 316.9
Fixed maturity securities, Fair Value, More than 12 Months | 128.2 | 409.3
Fixed maturity securities, Fair Value, Total | 507.2 | 726.2
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 3.8 | 17.2
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3.1 | 5.5
Fixed maturity securities, Gross Unrealized Losses, Total | $ 6.9 | $ 22.7

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