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Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
VOBA asset, amortization period	2 years

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- Definition

Value Of Business Acquired Asset, Amortization Period

+ References

No definition available.

+ Details

Name:	rnr_ValueOfBusinessAcquiredAssetAmortizationPeriod
Namespace Prefix:	rnr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration