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Long-Duration Insurance Contracts - Separate Account Liability Rollforward (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Separate Account, Liability [Roll Forward]    
Balance, beginning of year $ 2,792.3  
Balance, end of period 2,974.0 $ 2,792.3
Variable Account Annuities    
Separate Account, Liability [Roll Forward]    
Balance, beginning of year 2,792.3 3,441.0
Deposits 173.9 240.3
Withdrawals (163.3) (186.8)
Net transfers (11.1) (38.1)
Fees and charges (28.0) (36.8)
Market appreciation (depreciation) 215.6 (619.7)
Other (5.4) (7.6)
Balance, end of period $ 2,974.0 $ 2,792.3