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Future Policy Benefits and Claims - Additional Liability for Certain Benefit Features (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in the additional liability for certain benefits features      
Balance at end of period $ 4,335.0 $ 4,095.2  
Benefits and Protection | Life Insurance | Universal life      
Changes in the additional liability for certain benefits features      
Balance at beginning of period 4,095.2 3,814.2 $ 3,463.9
Effect of changes in cash flow assumptions   (6.0) (11.1)
Effect of actual variances from expected experience 14.6 54.9 18.1
Interest accrual 93.9 171.2 158.3
Net assessments collected 176.3 320.3 324.7
Benefit payments (45.0) (91.9) (83.1)
Other   (167.5) (56.6)
Balance at end of period 4,335.0 4,095.2 $ 3,814.2
Reinsurance impact (4,330.6) (4,091.4)  
Balance at end of period after reinsurance $ 4.4 $ 3.8  
Weighted-average duration for additional liability (in years) 26 years 4 months 24 days 27 years 7 months 6 days