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v3.20.2

Organization (Details) | 9 Months Ended
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Sep. 30, 2020
Variable Interest Entity, Not Primary Beneficiary | RenaissanceRe Upsilon Fund Ltd. |
Variable Interest Entity [Line Items] |
Percent of segregated funds owned by third party investors | 100.00%

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- Definition Variable Interest Entity, Nonredeemable, Nonvoting Shares, Segregated Funds, Owned by Third Parties + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
Name: | dei_LegalEntityAxis=rnr_RenaissanceReUpsilonFundLtd.Member
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