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Market Risk Benefits - Net Asset (Liability) Balances and Changes in Valuation of the MRBs for Individual Variable Annuities (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
The net asset (liability) balances and the changes in the valuation of the MRBs        
Balance at beginning of period $ (98.2)      
Balance at end of period 12.5 $ (98.2)    
Net amount at risk       $ 644.6
Retirement and Income Solutions | Individual variable annuities        
The net asset (liability) balances and the changes in the valuation of the MRBs        
Balance at beginning of period (72.2) (494.7) $ (591.3)  
Effect of changes in nonperformance risk at beginning of period (31.7) 109.5 (106.7)  
Adjusted balance at beginning of period (103.9) (385.2) (484.6)  
Interest accrual and expected policyholder behavior (36.9) (90.1) (120.7)  
Benefit payments 0.3 1.3 0.4  
Changes in interest rates (6.1) 539.1 154.3  
Changes in equity markets 106.1 (112.4) 106.4  
Changes in equity index volatility 47.4 (50.2) 15.1  
Actual policyholder behavior different from expected behavior (2.6) 1.5 2.3  
Changes in future expected policyholder behavior 0.0 (6.1) (96.6)  
Changes in other future expected assumptions 0.0 (1.8) 38.2  
Adjusted balance at end of period 4.3 (103.9) (385.2)  
Effect of changes in nonperformance risk at end of period (31.8) (31.7) 109.5  
Balance at end of period $ 36.1 $ (72.2) $ (494.7)  
Weighted-average attained age of policyholders (years) 67 years 7 months 6 days 67 years 4 months 24 days    
Net amount at risk $ 198.1 $ 415.5   $ 591.3