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Investments Available for Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost $ 2,366.7 $ 2,266.3  
Debt securities, available-for-sale, gross unrealized gain 3.9 84.3  
Debt securities, available-for-sale, gross unrealized loss (179.8) (7.7)  
Fixed maturity securities, fair value 2,186.3 2,342.7  
Debt Securities, Available-for-sale, Allowance for Credit Loss 4.5 0.2 $ 0.7
US Treasury Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 95.1 64.3  
Debt securities, available-for-sale, gross unrealized gain 0.1 1.6  
Debt securities, available-for-sale, gross unrealized loss (4.4) (0.2)  
Fixed maturity securities, fair value 90.8 65.7  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
US Government Agencies Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 2.2 2.2  
Debt securities, available-for-sale, gross unrealized gain 0.0 0.2  
Debt securities, available-for-sale, gross unrealized loss (0.1) 0.0  
Fixed maturity securities, fair value 2.1 2.4  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
US States and Political Subdivisions Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 326.7 413.8  
Debt securities, available-for-sale, gross unrealized gain 0.8 22.4  
Debt securities, available-for-sale, gross unrealized loss (9.9) (0.1)  
Fixed maturity securities, fair value 317.6 436.1  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Corporate Debt Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 963.4 1,035.3  
Debt securities, available-for-sale, gross unrealized gain 2.0 47.0  
Debt securities, available-for-sale, gross unrealized loss (94.5) (1.8)  
Fixed maturity securities, fair value 868.1 1,080.3  
Debt Securities, Available-for-sale, Allowance for Credit Loss 2.8 0.2  
Residential Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 403.5 319.0  
Debt securities, available-for-sale, gross unrealized gain 0.3 7.0  
Debt securities, available-for-sale, gross unrealized loss (43.6) (4.2)  
Fixed maturity securities, fair value 360.2 321.8  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Commercial Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 61.5 87.9  
Debt securities, available-for-sale, gross unrealized gain 0.0 4.5  
Debt securities, available-for-sale, gross unrealized loss (6.4) (0.1)  
Fixed maturity securities, fair value 55.1 92.3  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Asset-backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 74.0 68.6  
Debt securities, available-for-sale, gross unrealized gain 0.1 0.4  
Debt securities, available-for-sale, gross unrealized loss (8.0) (0.5)  
Fixed maturity securities, fair value 66.1 68.5  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Other Debt Obligations [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost [1] 159.2 177.0  
Debt securities, available-for-sale, gross unrealized gain [1] 0.6 1.2  
Debt securities, available-for-sale, gross unrealized loss [1] (2.9) (0.5)  
Fixed maturity securities, fair value [1] 155.2 177.7  
Debt Securities, Available-for-sale, Allowance for Credit Loss 1.7 0.0  
Collateralized Loan Obligations      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 268.1 85.5  
Debt securities, available-for-sale, gross unrealized gain 0.0 0.0  
Debt securities, available-for-sale, gross unrealized loss (7.2) (0.1)  
Fixed maturity securities, fair value 260.9 85.4  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Sovereign Debt Securities      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 13.0 12.7  
Debt securities, available-for-sale, gross unrealized gain 0.0 0.0  
Debt securities, available-for-sale, gross unrealized loss (2.8) (0.2)  
Fixed maturity securities, fair value 10.2 12.5  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Short-term Investments [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fixed maturity securities, amortized cost 119.1 10.5  
Debt securities, available-for-sale, gross unrealized gain 0.0 0.0  
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0  
Fixed maturity securities, fair value 119.1 10.5  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0 0.0  
Total AFS Investments [Domain]      
Debt Securities, Available-for-sale [Line Items]      
Total Available for sale Debt Securities and Short-term investments, Cost 2,485.8 2,276.8  
Total Available for sale Debt Securities and Short-term investments, Unrealized Gain 3.9 84.3  
Total Available for sale Debt Securities and Short-term investments, Unrealized Loss 179.8 7.7  
Total Available for sale investments $ 2,305.4 $ 2,353.2  
[1] Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.