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v3.20.4

Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2020
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
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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