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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value $ 4,961.6   $ 5,185.0        
Equity securities at fair value 77.0   99.6        
Net MRBs (4.5) $ (3.6) 0.2 $ 2.9 $ 4.6 $ 4.8 $ 8.6
Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 4,961.6   5,185.0        
Equity securities at fair value 77.0   99.6        
Financial Liabilities 80.3   92.5        
Mortgage-backed securities              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 590.5   570.4        
Mortgage-backed securities | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 590.5   570.4        
Municipal bonds              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,185.5   1,269.7        
Municipal bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,185.6   1,269.7        
Corporate bonds              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,685.3   1,901.7        
Corporate bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,685.3   1,901.7        
Other asset-backed securities              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,110.9   1,067.0        
Other asset-backed securities | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,110.9   1,067.0        
Level 3 | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 475.4   423.3        
Equity securities at fair value 2.2   2.0        
Totals 477.6   425.3        
Financial Liabilities 78.3   91.3        
Derivatives embedded in fixed indexed annuity products 82.8            
Net MRBs (4.5)            
Level 3 | Fair Value | Recurring | Internal              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 47.4   9.5        
Equity securities at fair value 0.0   0.0        
Totals 47.4   9.5        
Financial Liabilities 78.3   91.3        
Level 3 | Fair Value | Recurring | External              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 428.0   413.8        
Equity securities at fair value 2.2   2.0        
Totals 430.2   415.8        
Financial Liabilities 0.0   0.0        
Level 3 | Mortgage-backed securities | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 2.5   2.6        
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 2.5   2.6        
Level 3 | Municipal bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 69.7   54.4        
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 69.7   54.4        
Level 3 | Corporate bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 305.2   261.3        
Level 3 | Corporate bonds | Fair Value | Recurring | Internal              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 47.4   9.5        
Level 3 | Corporate bonds | Fair Value | Recurring | External              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 257.8   251.8        
Level 3 | Other asset-backed securities | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 98.0   105.0        
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 $ 98.0   $ 105.0        
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 0.083            
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 0.174            
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 0.054            
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 0.678            
Net MRBs, measurement input 0.678            
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