XML 98 R82.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 | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | $ (270,749) | $ (40,996) | $ (164,126)
Discount rate | Ogden Rate |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Cash surrender value, measurement input |  | (0.0075) | 0.025
Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (197) | $ (1,583) | $ (1,110)
Property |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (221,290) | (45,596) | (104,876)
Property | Actuarial assumption changes |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (5,682) | 842 |
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 | (215,608) | (46,438) | (104,876)
Property | Large catastrophe events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (182,029) | (7,640) | (33,926)
Property | Storm Sandy (2012) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (4,395) | (10,849)
Property | April and May U.S. Tornadoes (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (4,177) |
Property | Thailand Floods (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (15,131)
Property | Tohoku Earthquake and Tsunami (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  |  | (7,314)
Property | New Zealand Earthquake (2010) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | 4,061 | 6,904
Property | New Zealand Earthquake (2011) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | 5,807 | 1,987
Property | Other |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (9,517) | (8,936) | (9,523)
Property | Small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (33,579) | (38,798) | (70,950)
Property | 2017 Large Loss Events |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (172,512) |  |
Property | Tianjin Explosion (2015) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (8,002) | (5,686)
Property | Fort McMurray Wildfire (2016) |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years |  | (6,364) |
Property | Other small catastrophe events and attritional loss movements |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (33,579) | (24,432) | (65,264)
Casualty and Specialty |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | (49,262) | 6,183 | (58,140)
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 | (41,476) | (24,836) | (52,601)
Casualty and Specialty | Ogden Rate change |  |  |
Liability for Catastrophe Claims [Line Items] |  |  |
Net claims and claim expenses incurred – prior accident years | 0 | 33,481 | 0
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) | $ (5,539)

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_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=rnr_OgdenRateMember
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_LargeCatastropheEventsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_StormSandy2012Member
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_ThailandFloods2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_TohokuEarthquakeandTsunami2011Member
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_NewZealandEarthquake2011Member
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_A2017LargeLossEventsMember
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_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_FortMcMurrayWildfire2016Member
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_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: |