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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Sep. 30, 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) | security 3,002 516
Number of positions with a gross unrealized loss, more than 12 months (security) | security 303 122
Number of positions with a gross unrealized loss, Total (security) | security 3,305 638
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less (percent) 77.40% 12.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months (percent) 7.80% 3.40%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total (percent) 85.20% 16.00%
Total    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 4,082.5 $ 783.4
Fixed maturity securities, Fair Value, More than 12 Months 413.2 211.9
Fixed maturity securities, Fair Value, Total 4,495.7 995.3
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 565.7 11.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 95.6 7.3
Fixed maturity securities, Gross Unrealized Losses, Total 661.3 18.6
Mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 472.2 67.4
Fixed maturity securities, Fair Value, More than 12 Months 51.3 3.9
Fixed maturity securities, Fair Value, Total 523.5 71.3
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 51.5 1.3
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 14.6 0.2
Fixed maturity securities, Gross Unrealized Losses, Total 66.1 1.5
Other    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 266.6 59.5
Fixed maturity securities, Fair Value, More than 12 Months 58.0 35.1
Fixed maturity securities, Fair Value, Total 324.6 94.6
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 36.6 1.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 29.4 2.6
Fixed maturity securities, Gross Unrealized Losses, Total 66.0 4.3
Municipal bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 1,035.5 56.8
Fixed maturity securities, Fair Value, More than 12 Months 9.7 0.6
Fixed maturity securities, Fair Value, Total 1,045.2 57.4
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 143.5 0.7
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4.0 0.0
Fixed maturity securities, Gross Unrealized Losses, Total 147.5 0.7
Foreign government bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 35.4 0.0
Fixed maturity securities, Fair Value, More than 12 Months 0.0 0.0
Fixed maturity securities, Fair Value, Total 35.4 0.0
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 1.7 0.0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0.0 0.0
Fixed maturity securities, Gross Unrealized Losses, Total 1.7 0.0
Corporate bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 1,496.6 220.7
Fixed maturity securities, Fair Value, More than 12 Months 80.3 44.1
Fixed maturity securities, Fair Value, Total 1,576.9 264.8
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 280.0 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 31.0 1.4
Fixed maturity securities, Gross Unrealized Losses, Total 311.0 5.2
Other asset-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 776.2 379.0
Fixed maturity securities, Fair Value, More than 12 Months 213.9 128.2
Fixed maturity securities, Fair Value, Total 990.1 507.2
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 52.4 3.8
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 16.6 3.1
Fixed maturity securities, Gross Unrealized Losses, Total $ 69.0 $ 6.9