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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Millions
Jun. 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 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