XML 114 R95.htm IDEA: XBRL DOCUMENT
v3.25.0.1

RESERVE FOR CLAIMS AND CLAIM EXPENSES - Prior Year Development of the Reserve for Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (851,334) | $ (450,607) | $ (247,582)
Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | 840 |
Property |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (818,852) | (408,905) | (205,741)
Property | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 9,962 |  | 23,847
Property | Large and small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (828,814) | (409,745) | (229,588)
Property | Large catastrophe events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (622,198) | (309,820) | (198,564)
Property | 2023 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (31,899) |  |
Property | 2022 Weather-Related Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (284,327) | (85,653) |
Property | 2021 Weather-Related Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (180,028) | (36,949) | (12,387)
Property | 2020 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (47,512) | (42,577) | (24,589)
Property | 2019 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (14,445) | (43,850) | (97,034)
Property | 2018 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (38,295) | (40,050) | (20,318)
Property | 2017 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (25,692) | (46,404) | (39,481)
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (14,337) | (4,755)
Property | Small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (206,616) | (99,925) | (31,024)
Property | Other small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (206,616) | (99,925) | (31,024)
Property | Operating Segments |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (818,852) | (408,905) | (205,741)
Casualty and Specialty |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (32,482) | (41,702) | (41,841)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (67,595) | (44,612) | (63,353)
Casualty and Specialty | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 35,113 | 2,910 | 21,512
Casualty and Specialty | Operating Segments |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (32,482) | $ (41,702) | $ (41,841)

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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.W.Q2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479583/944-40-S99-1 + 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/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
Name: | us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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_A2023LargeLossEventsMember
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: |