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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) $ 5,387.9 $ 5,235.3  
Equity securities at fair value, (cost $78.8 and $86.2) 66.5 86.2  
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 1,121.3 1,138.8  
Net MRBs (6.8) (3.9) $ 0.3
Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 28.9 29.5  
Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 5,387.9 5,235.3  
Equity securities at fair value, (cost $78.8 and $86.2) 66.5 86.2  
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 28.9    
Financial Liabilities 79.6 86.0  
Mortgage-backed securities | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 755.8 653.2  
Municipal bonds | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 1,150.8 1,270.1  
Corporate bonds | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 1,782.4 1,772.7  
Other asset-backed securities | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 1,328.2 1,128.4  
Fair Value, Inputs, Level 3 | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 499.9 514.0  
Equity securities at fair value, (cost $78.8 and $86.2) 4.2 4.5  
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 28.9    
Totals 533.0 518.5  
Financial Liabilities 75.5 82.4  
Derivatives embedded in fixed indexed annuity products 82.3 86.3  
Net MRBs (6.8) (3.9)  
Fair Value, Inputs, Level 3 | Fair Value | Recurring | Internal      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 199.3 180.4  
Equity securities at fair value, (cost $78.8 and $86.2) 0.0 0.0  
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 0.0    
Totals 199.3 180.4  
Financial Liabilities 75.5 82.4  
Fair Value, Inputs, Level 3 | Fair Value | Recurring | External      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 300.6 333.6  
Equity securities at fair value, (cost $78.8 and $86.2) 4.2 4.5  
Limited partnership interests (Carried under Fair Value Option, 2024 $28.9 and 2023, $29.5) 28.9    
Totals 333.7 338.1  
Financial Liabilities 0.0 0.0  
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 0.0 0.0  
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring | Internal      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 0.0 0.0  
Fair Value, Inputs, Level 3 | Mortgage-backed securities | Fair Value | Recurring | External      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 0.0 0.0  
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 74.9 74.0  
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring | Internal      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 0.0 0.0  
Fair Value, Inputs, Level 3 | Municipal bonds | Fair Value | Recurring | External      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 74.9 74.0  
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 351.3 342.5  
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring | Internal      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 199.3 180.4  
Fair Value, Inputs, Level 3 | Corporate bonds | Fair Value | Recurring | External      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 152.0 162.1  
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 73.7 97.5  
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring | Internal      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) 0.0 0.0  
Fair Value, Inputs, Level 3 | Other asset-backed securities | Fair Value | Recurring | External      
Fair Value Measurement Inputs and Valuation Techniques      
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2024, $5,842.5; 2023, $5,652.9) $ 73.7 $ 97.5  
Minimum | Fair Value, Inputs, Level 3 | discounted cash flow | Measurement Input Option Budget      
Fair Value Measurement Inputs and Valuation Techniques      
Derivatives embedded in fixed indexed annuity products, measurement input 0.009 0.009  
Minimum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | yield      
Fair Value Measurement Inputs and Valuation Techniques      
Debt securities, measurement input 0.039 0.067  
Minimum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | option adjusted spread      
Fair Value Measurement Inputs and Valuation Techniques      
Debt securities, measurement input 0.0242    
Maximum | Fair Value, Inputs, Level 3 | discounted cash flow | Measurement Input Option Budget      
Fair Value Measurement Inputs and Valuation Techniques      
Derivatives embedded in fixed indexed annuity products, measurement input 0.038 0.038  
Maximum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | yield      
Fair Value Measurement Inputs and Valuation Techniques      
Debt securities, measurement input 0.106 0.170  
Maximum | Fair Value, Inputs, Level 3 | Corporate bonds | discounted cash flow | option adjusted spread      
Fair Value Measurement Inputs and Valuation Techniques      
Debt securities, measurement input 0.0768    
Weighted Average | Fair Value, Inputs, Level 3 | discounted cash flow | lapse rate      
Fair Value Measurement Inputs and Valuation Techniques      
Derivatives embedded in fixed indexed annuity products, measurement input 0.064 0.059  
Net MRBs, measurement input 0.064 0.059  
Weighted Average | Fair Value, Inputs, Level 3 | discounted cash flow | mortality multiplier      
Fair Value Measurement Inputs and Valuation Techniques      
Derivatives embedded in fixed indexed annuity products, measurement input 0.670 0.694  
Net MRBs, measurement input 0.670 0.678  
Weighted Average | Fair Value, Inputs, Level 3 | discounted cash flow | non-performance adjustment      
Fair Value Measurement Inputs and Valuation Techniques      
Derivatives embedded in fixed indexed annuity products, measurement input 0.050 0.050