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Investments - Schedule of Fixed Maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost $ 7,331.7 $ 7,295.0
Gross unrealized gains 32.3 14.8
Gross unrealized loss (728.0) (889.5)
Fixed maturities, allowance for credit losses (15.7) (10.7)
Fair Value 6,620.3 6,409.6
U.S. Government and Government Agencies and Authorities    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 673.4 588.6
Gross unrealized gains 3.2 0.6
Gross unrealized loss (84.7) (102.4)
Fixed maturities, allowance for credit losses 0.0 0.0
Fair Value 591.9 486.8
States and Political Subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 1,435.6 1,457.3
Gross unrealized gains 2.2 1.6
Gross unrealized loss (194.5) (225.4)
Fixed maturities, allowance for credit losses (0.1) (0.3)
Fair Value 1,243.2 1,233.2
Foreign Governments    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 12.1 6.5
Gross unrealized gains 0.2 0.3
Gross unrealized loss (0.3) (0.2)
Fixed maturities, allowance for credit losses 0.0 0.0
Fair Value 12.0 6.6
Corporate Bonds and Notes    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 3,982.7 4,038.3
Gross unrealized gains 22.1 8.9
Gross unrealized loss (417.2) (518.8)
Fixed maturities, allowance for credit losses (13.4) (8.8)
Fair Value 3,574.2 3,519.6
Redeemable Preferred Stocks    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 9.8 9.8
Gross unrealized gains 0.5 0.1
Gross unrealized loss 0.0 (1.0)
Fixed maturities, allowance for credit losses 0.0 0.0
Fair Value 10.3 8.9
Collateralized Loan Obligations    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 823.8 747.8
Gross unrealized gains 2.8 2.5
Gross unrealized loss (6.5) (7.2)
Fixed maturities, allowance for credit losses (2.2) (1.6)
Fair Value 817.9 741.5
Other Mortgage- and Asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturities, at amortized cost 394.3 446.7
Gross unrealized gains 1.3 0.8
Gross unrealized loss (24.8) (34.5)
Fixed maturities, allowance for credit losses 0.0 0.0
Fair Value $ 370.8 $ 413.0