INVESTMENTS - Reverse Purchase Agreements (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 156.7	$ 38.5
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

Securities Purchased Under Agreements To Resell Required Collateral Percentage Of Principal

No definition available.

Name:	rnr_SecuritiesPurchasedUnderAgreementsToResellRequiredCollateralPercentageOfPrincipal
Namespace Prefix:	rnr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant