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Reinsurance - Quota Share Reinsurance (Details) - Reinsurance Policy, Type [Axis]: Quota Share Reinsurance - USD ($)
$ in Billions
 9 Months Ended
Dec. 31, 2021
Sep. 30, 2023
QSR-2019    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Ceding Percentage   20.00%
Ceding Commission   20.00%
Profit Commission 60.00% 63.00%
Ceded premiums earned related to percent of risk on eligible single premium policies   40.00%
QSR-2022    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Ceding Percentage   20.00%
Ceding Commission   20.00%
Profit Commission   62.00%
RIF ceded   $ 8.1
QSR-2023    
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]    
Ceding Percentage   17.50%
Ceding Commission   20.00%
Profit Commission   58.00%