Basis of Presentation and Significant Accounting Policies (Details) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) segment	Apr. 30, 2024 USD ($)	Dec. 31, 2023	Oct. 25, 2023 USD ($)
Basis of Presentation
Number of reportable segments | segment		4
Percent of shares outstanding		12.30%
Subsidiary - HG Global
Basis of Presentation
Purchase of surplus notes		$ 503.0
Subsidiary - HG Global | Maximum
Basis of Presentation
Percentage of par value of policy reinsured		15.00%
Subsidiary - WTM Partners
Basis of Presentation
Expected capital contributions					$ 500.0
Subsidiary - Ark Insurance Holdings Limited
Basis of Presentation
Ownership percentage		72.00%		72.00%
Ownership percentage, after equity incentives		61.90%		61.90%
Subsidiary - WM Outrigger Re | Preferred Stock
Basis of Presentation
Ownership percentage		100.00%		100.00%
Subsidiary - HG Global | Preferred Stock
Basis of Presentation
Ownership percentage		96.90%		96.90%
Subsidiary - HG Global | Common Stock
Basis of Presentation
Ownership percentage		88.40%		88.40%
Subsidiary - Kudu Investment Management, LLC
Basis of Presentation
Ownership percentage		90.10%
Ownership percentage of basic units outstanding				89.60%
Ownership percentage, fully diluted		76.80%
Ownership percentage, fully converted				76.30%
Subsidiary - Bamboo Ide8 Insurance Services LLC
Basis of Presentation
Ownership percentage		72.80%
Ownership percentage, fully diluted		63.70%
Bamboo CRV
Basis of Presentation
Expected capital contributions		$ 30.0	$ 30.0
Preference share purchased	$ 12.1