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INVESTMENTS - Reverse Purchase Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 486.2	$ 38.5
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

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- Definition

Securities Purchased Under Agreements To Resell Required Collateral Percentage Of Principal

+ References

No definition available.

+ Details

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Namespace Prefix:	rnr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant