Statutory Requirements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022
Hamilton Re
Statutory Accounting Practices [Line Items]
Dividend payments without regulatory approval	$ 394,900
Dividends paid	44,000
Forecast | Hamilton Re
Statutory Accounting Practices [Line Items]
Dividend payments without regulatory approval		$ 470,700
Forecast | U.K. Subsidiaries
Statutory Accounting Practices [Line Items]
Dividend payments without regulatory approval		$ 900
Bermuda
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	1,882,833		$ 1,579,773
Required statutory capital and surplus	579,916		$ 522,116
Bermuda | Hamilton Re
Statutory Accounting Practices [Line Items]
Actual statutory capital and surplus	1,900,000
Required statutory capital and surplus	$ 579,900