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Long-Duration Insurance Contracts - Deferred Sale Inducement Costs, Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Movement in Deferred Sales Inducements [Roll Forward]    
Balance, beginning of period $ 14.9 $ 15.9
Capitalizations 0.0 0.0
Amortization expense (0.2) (0.8)
Experience adjustment (0.2) (0.6)
Balance, end of period $ 14.5 $ 14.5