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Transactions With Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jul. 01, 2021	Jan. 01, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Premiums ceded	$ 1,166,635	$ 888,749
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	5,941,000	$ 4,041,076	$ 5,880,735			$ 4,500,802
Reinsurance balances payable	1,510,906		$ 1,583,253
Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership				40.00%
Kelso And Company | Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership				30.00%
Warburg Pincus LLC | Greysbridge Holdings Ltd
Related Party Transaction [Line Items]
Percentage ownership				30.00%
Operating affiliates | Premia Holdings Ltd
Related Party Transaction [Line Items]
Legacy business, amount of liabilities transferred					$ 380,000
Operating affiliates | Somers Holdings Ltd
Related Party Transaction [Line Items]
Premiums ceded	220,500
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	933,700
Reinsurance balances payable	324,400
Senior notes, face amount	$ 35,000
Senior notes, stated percentage	6.50%
Operating affiliates | Somers Holdings Ltd | Non-cumulative preferred shares
Related Party Transaction [Line Items]
Percentage ownership	6.60%

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