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Fair Value of Financial Instruments - Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value $ 5,211.9   $ 5,185.0        
Equity securities at fair value 85.8   99.6        
Net MRBs (3.6) $ 1.3 0.2 $ 4.6 $ 4.0 $ 4.8 $ 8.6
Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 5,211.9   5,185.0        
Equity securities at fair value 85.8   99.6        
Municipal bonds              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,252.5   1,269.7        
Municipal bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,252.6   1,269.7        
Corporate bonds              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,828.4   1,901.7        
Corporate bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 1,828.4   1,901.7        
Level 3 | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value 476.8   423.3        
Equity securities at fair value 2.0   2.0        
Derivatives embedded in fixed indexed annuity products 87.2            
Net MRBs (3.6)            
Level 3 | Municipal bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value $ 63.9   54.4        
Level 3 | Municipal bonds | discounted cash flow | option adjusted spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0308            
Level 3 | Corporate bonds | Fair Value | Recurring              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value $ 311.5   $ 261.3        
Level 3 | Corporate bonds | discounted cash flow | option adjusted spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0241            
Level 3 | Corporate bonds | discounted cash flow | exit cap              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 6.2            
Level 3 | Corporate bonds | vendor priced | vendor priced              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 79.64            
Level 3 | Corporate bonds | market comparable | EV / Fwd EBITDA (x)              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 5.92            
Level 3 | Mortgage-backed and other asset-backed securities | Fair Value              
Fair Value Measurement Inputs and Valuation Techniques              
Fair Value $ 101.4            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | LIBOR              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.023            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount margin              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.395            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | PDI spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.055            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | SBL spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.045            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | CPR              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.200            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | default rate annual              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.040            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | recovery              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.650            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | I spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0175            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | N spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0463            
Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | T Spread              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0226            
Level 3 | Mortgage-backed and other asset-backed securities | market comparable | median price              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 81.34            
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 | market comparable | price/book ExAOCI              
Fair Value Measurement Inputs and Valuation Techniques              
Equity securities, measurement input 1.06            
Minimum | Level 3 | black-scholes | volatility              
Fair Value Measurement Inputs and Valuation Techniques              
Equity securities, measurement input 0.280            
Minimum | Level 3 | black-scholes | time to exit              
Fair Value Measurement Inputs and Valuation Techniques              
Equity securities, measurement input 0.000267            
Minimum | Level 3 | Corporate bonds | discounted cash flow | yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.061            
Minimum | Level 3 | Corporate bonds | discounted cash flow | discount rate              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 6.2            
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.064            
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount rate              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.160            
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | median comparable yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.207            
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | weighting              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.170            
Minimum | Level 3 | Mortgage-backed and other asset-backed securities | vendor priced | haircut              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.0001            
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 | black-scholes | volatility              
Fair Value Measurement Inputs and Valuation Techniques              
Equity securities, measurement input 0.440            
Maximum | Level 3 | Corporate bonds | discounted cash flow | yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 11.0            
Maximum | Level 3 | Corporate bonds | discounted cash flow | discount rate              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 10.7            
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.065            
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | discount rate              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.210            
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | median comparable yield              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.432            
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | discounted cash flow | weighting              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.830            
Maximum | Level 3 | Mortgage-backed and other asset-backed securities | vendor priced | haircut              
Fair Value Measurement Inputs and Valuation Techniques              
Debt securities, measurement input 0.003            
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 0.053            
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