Reinsurance and Indemnification - National General Reciprocal Excess Catastrophe Reinsurance Contracts (Narrative) (Details) - Traditional Market - National General Reciprocal Excess Catastrophe Reinsurance Contract $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) reinstatement
Reinsurance Retention Policy [Line Items]
Limit of aggregate losses under aggregate excess agreement	$ 212
Retention amount for catastrophe reinsurance agreement contracts	$ 7
Number of reinstatements each year for each contract | reinstatement	1