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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Millions | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Number of positions with a gross unrealized loss, 12 Months or Less | security | 548 | 308
Number of position with a gross unrealized loss, more than 12 months | security | 200 | 123
Number of position with a gross unrealized loss, Total | security | 748 | 431
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 13.30% | 8.90%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 6.50% | 6.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 19.80% | 15.60%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 24.0 | $ 4.9
Fixed maturity securities, Fair Value, More than 12 Months | 3.1 | 2.6
Fixed maturity securities, Fair Value, Total | 27.1 | 7.5
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1.5 | 0.1
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.2 | 0.2
Fixed maturity securities, Gross Unrealized Losses, Total | 1.7 | 0.3
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 172.4 | 95.9
Fixed maturity securities, Fair Value, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Fair Value, Total | 172.4 | 95.9
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 11.3 | 1.0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 11.3 | 1.0
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 126.5 | 18.1
Fixed maturity securities, Fair Value, More than 12 Months | 5.4 | 0.0
Fixed maturity securities, Fair Value, Total | 131.9 | 18.1
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 3.4 | 0.5
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0.1 | 0.0
Fixed maturity securities, Gross Unrealized Losses, Total | 3.5 | 0.5
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0.5 | 0.0
Fixed maturity securities, Fair Value, More than 12 Months | 0.0 | 0.0
Fixed maturity securities, Fair Value, Total | 0.5 | 0.0
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 | 382.1 | 126.6
Fixed maturity securities, Fair Value, More than 12 Months | 47.1 | 10.9
Fixed maturity securities, Fair Value, Total | 429.2 | 137.5
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 16.4 | 3.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1.6 | 0.2
Fixed maturity securities, Gross Unrealized Losses, Total | 18.0 | 3.9
Other asset-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 137.1 | 316.9
Fixed maturity securities, Fair Value, More than 12 Months | 359.4 | 409.3
Fixed maturity securities, Fair Value, Total | 496.5 | 726.2
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1.3 | 17.2
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 12.8 | 5.5
Fixed maturity securities, Gross Unrealized Losses, Total | 14.1 | 22.7
Total Fixed Maturity Securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 842.6 | 562.4
Fixed maturity securities, Fair Value, More than 12 Months | 415.0 | 422.8
Fixed maturity securities, Fair Value, Total | 1,257.6 | 985.2
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 33.9 | 22.5
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 14.7 | 5.9
Fixed maturity securities, Gross Unrealized Losses, Total | $ 48.6 | $ 28.4

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