Reinsurance and Indemnification - National General Reciprocal Excess Catastrophe Reinsurance Contracts (Narrative) (Details) - Traditional Market - National General Reciprocal Excess Catastrophe Reinsurance Contract $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) reinstatement	Dec. 31, 2023 CAD ($) reinstatement
Reinsurance Retention Policy [Line Items]
Limit of aggregate losses under aggregate excess agreement	$ 600
Retention amount for catastrophe reinsurance agreement contracts		$ 20
Number of reinstatements each year for each contract | reinstatement	1	1