Reinsurance - Quota Share Reinsurance (Details) - Reinsurance Policy, Type [Axis]: Quota Share Reinsurance - USD ($) $ in Billions	3 Months Ended	9 Months Ended
	Dec. 31, 2025	Sep. 30, 2026
QSR-2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage		20.00%
QSR-2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage		17.50%
QSR-2024
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage		15.00%
QSR-2025
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage	20.00%	25.00%
QSR-2026
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage		25.00%
QSR-2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Ceding Percentage		18.00%
Ceded premiums earned related to percent of risk on eligible single premium policies		36.00%
QSR
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
RIF ceded		$ 11.4