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Nature of Operations and Significant Accounting Policies - Balances and changes in 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