FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 252,644	$ 38,753	$ 182,076	$ 43,372
Net investment income
Net foreign exchange gains (losses)	2	29	(7)	43
Purchases	83,246	41,459	156,329	41,459
Sales	(25)		(25)
Settlements	(905)	(565)	(964)	(761)
Ending balance	335,089	76,094	335,089	76,094
Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	144,696		114,256
Net investment income
Net foreign exchange gains (losses)	0		0
Purchases	75,001		105,441
Sales	0		0
Settlements	0		0
Ending balance	219,697		219,697
Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	83,652	0	39,859	0
Net investment income
Net foreign exchange gains (losses)	0	0	0	0
Purchases	8,245	41,459	50,888	41,459
Sales	(25)		(25)
Settlements	(905)	(523)	(981)	(523)
Ending balance	91,767	40,936	91,767	40,936
Direct Private Equity Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	24,296	38,987	27,995	43,777
Net investment income
Net foreign exchange gains (losses)	2	29	(7)	43
Purchases	0	0	0	0
Sales	0		0
Settlements	0	0	0	0
Ending balance	23,625	35,308	23,625	35,308
Other Assets and (Liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	(234)	(34)	(405)
Net investment income
Net foreign exchange gains (losses)	0	0	0	0
Purchases	0	0	0	0
Sales	0		0
Settlements	0	(42)	17	(238)
Ending balance	0	(150)	0	(150)
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome
Net investment income
Included in earnings (loss)	1,248	70	2,481	139
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome \| Corporate
Net investment income
Included in earnings (loss)	0		0
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome \| Asset-backed
Net investment income
Included in earnings (loss)	1,166	0	2,318	0
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome \| Direct Private Equity Investments
Net investment income
Included in earnings (loss)	82	70	163	139
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome \| Other Assets and (Liabilities)
Net investment income
Included in earnings (loss)	0	0	0	0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses
Net investment income
Included in earnings (loss)	(1,121)	(3,778)	(4,818)	(8,651)
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses \| Corporate
Net investment income
Included in earnings (loss)	0		0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses \| Asset-backed
Net investment income
Included in earnings (loss)	(366)	0	(292)	0
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses \| Direct Private Equity Investments
Net investment income
Included in earnings (loss)	(755)	(3,778)	(4,526)	(8,651)
Income Statement Location [Axis]: us-gaap:NonoperatingGainsLosses \| Other Assets and (Liabilities)
Net investment income
Included in earnings (loss)	$ 0	0	0	0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet
Net investment income
Included in earnings (loss)		126	17	493
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet \| Corporate
Net investment income
Included in earnings (loss)			0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet \| Asset-backed
Net investment income
Included in earnings (loss)		0	0	0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet \| Direct Private Equity Investments
Net investment income
Included in earnings (loss)		0	0	0
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet \| Other Assets and (Liabilities)
Net investment income
Included in earnings (loss)		$ 126	$ 17	$ 493

RENAISSANCERE HOLDINGS LTD 10-Q