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Investments Available for Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost $ 2,333.6 $ 2,403.3
Debt securities, available-for-sale, gross unrealized gain 147.9 83.8
Debt securities, available-for-sale, gross unrealized loss (2.3) (1.2)
Fixed maturity securities, fair value 2,479.2 2,485.9
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 74.3 83.7
Debt securities, available-for-sale, gross unrealized gain 4.0 1.9
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0
Fixed maturity securities, fair value 78.3 85.6
US Government Agencies Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 2.8 2.8
Debt securities, available-for-sale, gross unrealized gain 0.3 0.1
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0
Fixed maturity securities, fair value 3.1 2.9
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 449.4 458.2
Debt securities, available-for-sale, gross unrealized gain 33.3 26.3
Debt securities, available-for-sale, gross unrealized loss 0.0 0.0
Fixed maturity securities, fair value 482.7 484.5
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 963.5 1,038.6
Debt securities, available-for-sale, gross unrealized gain 83.2 40.4
Debt securities, available-for-sale, gross unrealized loss (0.3) 0.0
Fixed maturity securities, fair value 1,046.4 1,079.0
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 444.6 471.7
Debt securities, available-for-sale, gross unrealized gain 16.7 9.4
Debt securities, available-for-sale, gross unrealized loss (0.3) (0.7)
Fixed maturity securities, fair value 461.0 480.4
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 94.7 107.4
Debt securities, available-for-sale, gross unrealized gain 7.8 3.2
Debt securities, available-for-sale, gross unrealized loss (0.1) 0.0
Fixed maturity securities, fair value 102.4 110.6
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 42.0 60.4
Debt securities, available-for-sale, gross unrealized gain 0.9 0.9
Debt securities, available-for-sale, gross unrealized loss (0.3) (0.1)
Fixed maturity securities, fair value 42.6 61.2
Other Debt Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost [1] 169.9 180.5
Debt securities, available-for-sale, gross unrealized gain [1] 1.5 1.6
Debt securities, available-for-sale, gross unrealized loss [1] (0.5) (0.4)
Fixed maturity securities, fair value [1] 170.9 181.7
Collateralized Loan Obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 84.4  
Debt securities, available-for-sale, gross unrealized gain 0.0  
Debt securities, available-for-sale, gross unrealized loss (0.8)  
Fixed maturity securities, fair value 83.6  
Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Short-term investments, at amortized cost 26.5  
Total AFS, gross unrealized gain 0.1  
Total AFS investments, gross unrealized loss 0.0  
Total AFS investments 26.6  
Total AFS Investments [Domain]    
Debt Securities, Available-for-sale [Line Items]    
Short-term investments, at amortized cost 2,360.1 2,403.3
Total AFS, gross unrealized gain 148.0 83.8
Total AFS investments, gross unrealized loss 2.3 1.2
Total AFS investments 2,505.8 $ 2,485.9
Sovereign Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, amortized cost 8.0  
Debt securities, available-for-sale, gross unrealized gain 0.2  
Debt securities, available-for-sale, gross unrealized loss 0.0  
Fixed maturity securities, fair value $ 8.2  
[1] Other securities within fixed maturity securities consist of bank loans, which are classified as AFS and reported at fair value.