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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Mar. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Fixed maturity securities, Gross Unrealized Losses    
Number of positions with a gross unrealized loss, 12 Months or Less | security 1,756 516
Number of position with a gross unrealized loss, more than 12 months | security 189 122
Number of position with a gross unrealized loss, Total | security 1,945 638
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less 41.10% 12.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months 5.00% 3.40%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total 46.10% 16.00%
Total    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 2,462.1 $ 783.4
Fixed maturity securities, Fair Value, More than 12 Months 297.9 211.9
Fixed maturity securities, Fair Value, Total 2,760.0 995.3
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 124.6 11.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 29.5 7.3
Fixed maturity securities, Gross Unrealized Losses, Total 154.1 18.6
Mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 238.4 67.4
Fixed maturity securities, Fair Value, More than 12 Months 11.0 3.9
Fixed maturity securities, Fair Value, Total 249.4 71.3
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 10.7 1.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 2.4 0.2
Fixed maturity securities, Gross Unrealized Losses, Total 13.1 1.5
Other    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 116.2 59.5
Fixed maturity securities, Fair Value, More than 12 Months 50.4 35.1
Fixed maturity securities, Fair Value, Total 166.6 94.6
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 9.2 1.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 11.7 2.6
Fixed maturity securities, Gross Unrealized Losses, Total 20.9 4.3
Municipal bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 456.0 56.8
Fixed maturity securities, Fair Value, More than 12 Months 1.4 0.6
Fixed maturity securities, Fair Value, Total 457.4 57.4
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 23.4 0.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.2 0.0
Fixed maturity securities, Gross Unrealized Losses, Total 23.6 0.7
Foreign government bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 1.5 0.0
Fixed maturity securities, Fair Value, More than 12 Months 0.0 0.0
Fixed maturity securities, Fair Value, Total 1.5 0.0
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 0.1 0.0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.0 0.0
Fixed maturity securities, Gross Unrealized Losses, Total 0.1 0.0
Corporate bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 1,012.5 220.7
Fixed maturity securities, Fair Value, More than 12 Months 74.9 44.1
Fixed maturity securities, Fair Value, Total 1,087.4 264.8
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 66.7 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 8.8 1.4
Fixed maturity securities, Gross Unrealized Losses, Total 75.5 5.2
Other asset-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 637.5 379.0
Fixed maturity securities, Fair Value, More than 12 Months 160.2 128.2
Fixed maturity securities, Fair Value, Total 797.7 507.2
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 14.5 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 6.4 3.1
Fixed maturity securities, Gross Unrealized Losses, Total $ 20.9 $ 6.9