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Investments - Continuous Unrealized Loss (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
U.S. Government and Government Agencies and Authorities      
Fixed Maturities:      
Fair Value $ 427.0 $ 168.7  
Fair Value 33.3 1.2  
Fair Value 460.3 169.9  
Fixed Maturities:      
Unrealized Losses (79.0) (1.8)  
Unrealized Losses (8.2) (0.1)  
Unrealized Losses (87.2) (1.9)  
States and Political Subdivisions      
Fixed Maturities:      
Fair Value 1,095.5 385.0  
Fair Value 123.5 1.5  
Fair Value 1,219.0 386.5  
Fixed Maturities:      
Unrealized Losses (221.7) (6.9)  
Unrealized Losses (44.7) (0.1)  
Unrealized Losses (266.4) (7.0)  
Foreign Governments      
Fixed Maturities:      
Fair Value 1.9 2.2  
Fair Value 1.8 2.6  
Fair Value 3.7 4.8  
Fixed Maturities:      
Unrealized Losses (0.1) (0.6)  
Unrealized Losses (1.0) (0.6)  
Unrealized Losses (1.1) (1.2)  
Corporate Debt Securities [Member]      
Fixed Maturities:      
Fair Value 2,903.1 596.8  
Fair Value 250.5 49.3  
Fair Value 3,153.6 646.1  
Fixed Maturities:      
Unrealized Losses (507.2) (13.1)  
Unrealized Losses (68.6) (2.9)  
Unrealized Losses (575.8) (16.0)  
Redeemable Preferred Stocks      
Fixed Maturities:      
Fair Value 7.7   $ 0.1
Fair Value 0.0   0.0
Fair Value 7.7   0.1
Fixed Maturities:      
Unrealized Losses (1.0)   0.0
Unrealized Losses 0.0   0.0
Unrealized Losses (1.0)   $ 0.0
Collateralized Loan Obligations      
Fixed Maturities:      
Fair Value 689.2 250.9  
Fair Value 261.4 192.6  
Fair Value 950.6 443.5  
Fixed Maturities:      
Unrealized Losses (38.4) (2.6)  
Unrealized Losses (15.9) (2.2)  
Unrealized Losses (54.3) (4.8)  
Other Mortgage- and Asset-backed      
Fixed Maturities:      
Fair Value 228.3 100.1  
Fair Value 61.2 0.0  
Fair Value 289.5 100.1  
Fixed Maturities:      
Unrealized Losses (32.4) (1.8)  
Unrealized Losses (13.1) 0.0  
Unrealized Losses (45.5) (1.8)  
Investments in Fixed Maturities      
Fixed Maturities:      
Fair Value 5,352.7 1,503.8  
Fair Value 731.7 247.2  
Fair Value 6,084.4 1,751.0  
Fixed Maturities:      
Unrealized Losses (879.8) (26.8)  
Unrealized Losses (151.5) (5.9)  
Unrealized Losses (1,031.3) (32.7)  
Investments in Fixed Maturities | Non-investment-grade      
Fixed Maturities:      
Unrealized Losses $ (33.1) $ (9.0)