XML 65 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (9,416) | $ 12,435 | $ (196,980) | $ (3,663) |
Ogden Rate | Discount rate |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Cash surrender value, measurement input | (0.0075) |  | (0.0075) |  | 0.025
Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years | $ (18) | $ (155) | $ (88) | (710) |
Property |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (172,872) | (16,968) |
Property | Actuarial assumption changes |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (5,682) | 843 |
Property | Large and Small Catastrophe Events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (167,190) | (17,811) |
Property | Large catastrophe events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (158,468) | 2,764 |
Property | 2017 Catastrophe Events |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (151,155) |  |
Property | Other |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (7,313) | (3,881) |
Property | New Zealand Earthquake (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 5,807 |
Property | New Zealand Earthquake (2010) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | 5,001 |
Property | April and May U.S. Tornadoes (2011) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | (4,163) |
Property | Small catastrophe events and attritional loss movements |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (8,722) | (20,575) |
Property | Other small catastrophe events and attritional loss movements |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (8,722) | (9,293) |
Property | Fort McMurray Wildfire (2016) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | (6,386) |
Property | Tianjin Explosion (2015) |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  |  | (4,896) |
Casualty and Specialty |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (24,020) | 14,015 |
Casualty and Specialty | Actuarial methods |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (16,234) | (17,004) |
Casualty and Specialty | Actuarial assumption changes |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (7,786) | (2,462) |
Casualty and Specialty | Ogden Rate change |  |  |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | $ 0 | $ 33,481 |

X
- Definition Value of input used to measure cash surrender value of insurance policy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_CashSurrenderValueMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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=99382578&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_ValuationTechniqueAxis=rnr_OgdenRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
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_ChangeInActuarialAssumptionMember
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_LargeCatastropheEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_A2017CatastropheEventsMember
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_NewZealandEarthquake2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_NewZealandEarthquake2010Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_AprilandMayU.S.Tornadoes2011Member
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: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_FortMcMurrayWildfire2016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_TianjinExplosion2015Member
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: |

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