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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value $ 5,342.7 $ 5,235.3    
Equity securities at fair value, (cost $101700000 and $86200000) 84.7 86.2    
Net MRBs (6.3) (3.9) $ 1.3 $ 0.2
Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 5,342.7 5,235.3    
Equity securities at fair value, (cost $101700000 and $86200000) 84.7 86.2    
Financial Liabilities 85.0 86.0    
Mortgage-backed securities        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 677.7 653.2    
Mortgage-backed securities | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 677.7 653.2    
Municipal bonds        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,207.5 1,270.1    
Municipal bonds | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,207.5 1,270.1    
Corporate bonds        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,829.9 1,772.7    
Corporate bonds | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,829.9 1,772.7    
Other asset-backed securities        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,214.5 1,128.4    
Other asset-backed securities | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 1,214.5 1,128.4    
Level 3 | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 507.4 514.0    
Equity securities at fair value, (cost $101700000 and $86200000) 2.5 4.5    
Totals 509.9 518.5    
Financial Liabilities 80.8 82.4    
Derivatives embedded in fixed indexed annuity products 87.1      
Net MRBs (6.3)      
Level 3 | Fair Value | Recurring | Internal        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 185.5 180.4    
Equity securities at fair value, (cost $101700000 and $86200000) 0.0 0.0    
Totals 185.5 180.4    
Financial Liabilities 80.8 82.4    
Level 3 | Fair Value | Recurring | External        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 321.9 333.6    
Equity securities at fair value, (cost $101700000 and $86200000) 2.5 4.5    
Totals 324.4 338.1    
Financial Liabilities 0.0 0.0    
Level 3 | Mortgage-backed securities | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 0.0 0.0    
Level 3 | Mortgage-backed securities | Fair Value | Recurring | Internal        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 0.0 0.0    
Level 3 | Mortgage-backed securities | Fair Value | Recurring | External        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 0.0 0.0    
Level 3 | Municipal bonds | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 73.2 74.0    
Level 3 | Municipal bonds | Fair Value | Recurring | Internal        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 0.0 0.0    
Level 3 | Municipal bonds | Fair Value | Recurring | External        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 73.2 74.0    
Level 3 | Corporate bonds | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 345.5 342.5    
Level 3 | Corporate bonds | Fair Value | Recurring | Internal        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 185.5 180.4    
Level 3 | Corporate bonds | Fair Value | Recurring | External        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 160.0 162.1    
Level 3 | Other asset-backed securities | Fair Value | Recurring        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 88.7 97.5    
Level 3 | Other asset-backed securities | Fair Value | Recurring | Internal        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value 0.0 0.0    
Level 3 | Other asset-backed securities | Fair Value | Recurring | External        
Fair Value Measurement Inputs and Valuation Techniques        
Fair Value $ 88.7 $ 97.5    
Minimum | Level 3 | discounted cash flow | option budget        
Fair Value Measurement Inputs and Valuation Techniques        
Derivatives embedded in fixed indexed annuity products, measurement input 0.009      
Minimum | Level 3 | Corporate bonds | discounted cash flow | yield        
Fair Value Measurement Inputs and Valuation Techniques        
Debt securities, measurement input 0.045      
Minimum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread        
Fair Value Measurement Inputs and Valuation Techniques        
Debt securities, measurement input 0.0116      
Maximum | Level 3 | discounted cash flow | option budget        
Fair Value Measurement Inputs and Valuation Techniques        
Derivatives embedded in fixed indexed annuity products, measurement input 0.038      
Maximum | Level 3 | Corporate bonds | discounted cash flow | yield        
Fair Value Measurement Inputs and Valuation Techniques        
Debt securities, measurement input 0.162      
Maximum | Level 3 | Corporate bonds | discounted cash flow | option adjusted spread        
Fair Value Measurement Inputs and Valuation Techniques        
Debt securities, measurement input 0.0852      
Weighted Average | Level 3 | discounted cash flow | lapse rate        
Fair Value Measurement Inputs and Valuation Techniques        
Derivatives embedded in fixed indexed annuity products, measurement input 0.059      
Net MRBs, measurement input 0.059      
Weighted Average | Level 3 | discounted cash flow | mortality multiplier        
Fair Value Measurement Inputs and Valuation Techniques        
Derivatives embedded in fixed indexed annuity products, measurement input 0.694      
Net MRBs, measurement input 0.694      
Weighted Average | 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