XML 68 R56.htm IDEA: XBRL DOCUMENT
v3.20.2

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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (15,406) | $ 233 | $ (1,506) | $ (4,073)
Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 5,809
Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | (44) | (2) | (151) | 17
Property |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 7,444 | 12,640
Property | Actuarial methods |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 43,500 |
Property | Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 5,800
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 |  |  |  | 6,831
Property | Large catastrophe events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (29,067) | (2,690)
Property | 2019 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (19,940) |
Property | 2018 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (12,306) | 52,132
Property | 2017 Large Loss Events |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (3,825) | (56,234)
Property | Other |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 7,004 | 1,412
Property | Small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 36,511 | 9,521
Property | Other small catastrophe events and attritional loss movements |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 36,511 | 9,521
Property | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | (6,564) | 10,763 | 7,444 | 12,640
Casualty and Specialty |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (8,799) | (16,730)
Casualty and Specialty | Actuarial methods |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (8,799) | (28,850)
Casualty and Specialty | Change In Actuarial Assumption |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | 0 | 12,120
Casualty and Specialty | Operating Segments |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (8,798) | $ (10,528) | $ (8,799) | $ (16,730)

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 http://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_NoncatastrophicEventAxis=rnr_ChangeInActuarialAssumptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
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_NoncatastrophicEventAxis=rnr_ReportedClaimsLessThanExpectedMember
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_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: |