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Investments Available for Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost $ 2,266.1 $ 2,333.6
Debt securities, available-for-sale, gross unrealized gain 84.3 147.9
Debt securities, available-for-sale, gross unrealized loss (7.7) (2.3)
Fixed maturity securities, fair value 2,342.7 2,479.2
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 64.3 74.3
Debt securities, available-for-sale, gross unrealized gain 1.6 4.0
Debt securities, available-for-sale, gross unrealized loss (0.2) 0.0
Fixed maturity securities, fair value 65.7 78.3
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 2.2 2.8
Debt securities, available-for-sale, gross unrealized gain 0.2 0.3
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0
Fixed maturity securities, fair value 2.4 3.1
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 413.8 449.4
Debt securities, available-for-sale, gross unrealized gain 22.4 33.3
Debt securities, available-for-sale, gross unrealized loss (0.1) 0.0
Fixed maturity securities, fair value 436.1 482.7
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 1,035.1 963.5
Debt securities, available-for-sale, gross unrealized gain 47.0 83.2
Debt securities, available-for-sale, gross unrealized loss (1.8) (0.3)
Fixed maturity securities, fair value 1,080.3 1,046.4
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 319.0 444.6
Debt securities, available-for-sale, gross unrealized gain 7.0 16.7
Debt securities, available-for-sale, gross unrealized loss (4.2) (0.3)
Fixed maturity securities, fair value 321.8 461.0
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 87.9 94.7
Debt securities, available-for-sale, gross unrealized gain 4.5 7.8
Debt securities, available-for-sale, gross unrealized loss (0.1) (0.1)
Fixed maturity securities, fair value 92.3 102.4
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 68.6 42.0
Debt securities, available-for-sale, gross unrealized gain 0.4 0.9
Debt securities, available-for-sale, gross unrealized loss (0.5) (0.3)
Fixed maturity securities, fair value 68.5 42.6
Other Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost [1] 177.0 169.9
Debt securities, available-for-sale, gross unrealized gain [1] 1.2 1.5
Debt securities, available-for-sale, gross unrealized loss [1] (0.5) (0.5)
Fixed maturity securities, fair value [1] 177.7 170.9
Collateralized Loan Obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 85.5 84.4
Debt securities, available-for-sale, gross unrealized gain 0.0 0.0
Debt securities, available-for-sale, gross unrealized loss (0.1) (0.8)
Fixed maturity securities, fair value 85.4 83.6
Sovereign Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 12.7 8.0
Debt securities, available-for-sale, gross unrealized gain 0.0 0.2
Debt securities, available-for-sale, gross unrealized loss (0.2) 0.0
Fixed maturity securities, fair value 12.5 8.2
Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 10.5 26.5
Debt securities, available-for-sale, gross unrealized gain 0.0 0.1
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0
Fixed maturity securities, fair value 10.5 26.6
Total AFS Investments [Domain]    
Debt Securities, Available-for-sale [Line Items]    
Total Available for sale Debt Securities and Short-term investments, Cost 2,276.6 2,360.1
Total Available for sale Debt Securities and Short-term investments, Unrealized Gain 84.3 148.0
Total Available for sale Debt Securities and Short-term investments, Unrealized Loss 7.7 2.3
Total Available for sale investments $ 2,353.2 $ 2,505.8
[1] Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.