XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.23.1

RESERVE FOR CLAIMS AND CLAIM EXPENSES - Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (104,752) | $ (17,833)
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (81,693) | (16,758)
Property | Large and Small Catastrophe Events and Attritional Loss Movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (81,693) | (16,758)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (76,607) | (14,290)
Property | 2022 Weather-Related Large Losses |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (7,785) |
Property | 2021 Weather-Related Large Lossses |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (32,333) | 19,190
Property | 2020 Weather-Related Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | 6,535 | (5,272)
Property | 2019 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (15,369) | (4,807)
Property | 2018 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (16,259) | (3,800)
Property | 2017 Large Loss Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (11,486) | (18,000)
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | 90 | (1,601)
Property | Small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (5,086) | (2,468)
Property | Other small catastrophe events and attritional loss movements |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (5,086) | (2,468)
Property | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (81,693) | (16,758)
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (23,059) | (1,075)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | (23,059) | (1,075)
Casualty and Specialty | Operating Segments |  |
Liability for Catastrophe Claims [Line Items] |  |
Net (favorable) adverse development of prior accident years net claims and claim expenses | $ (23,059) | $ (1,075)

X
- 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
Name: | us-gaap_LiabilityForCatastropheClaimsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
Name: | us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_PropertySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_LargeandSmallCatastropheEventsAndAttritionalLossMovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_LargeCatastropheEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2022LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2021LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2020LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2019LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2018LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2017LargeLossEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_OtherLargeCatastropheEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_SmallCatastropheEventsAndAttritionalLossMovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_OtherSmallCatastropheEventsAndAttritionalLossMovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rnr_CasualtyandSpecialtySegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NoncatastrophicEventAxis=rnr_ReportedClaimsLessThanExpectedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |