XML 65 R54.htm IDEA: XBRL DOCUMENT
v3.8.0.1

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, 2018 | Mar. 31, 2017
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ (31,335) | $ 29,006
Ogden Rate | Maximum |  |
Liability for Catastrophe Claims [Line Items] |  |
Discount rate |  | 2.50%
Ogden Rate | Minimum |  |
Liability for Catastrophe Claims [Line Items] |  |
Discount rate |  | (0.75%)
Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 18 | $ (328)
Property |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (27,562) | (928)
Property | Large and Small Catastrophe Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (27,562) | (928)
Property | Large catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (31,367) | 2,586
Property | 2017 Catastrophe Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (27,109) |
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (4,258) | 2,586
Property | Small catastrophe events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 3,805 | (3,514)
Property | Fort McMurray Wildfire (2016) |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years |  | (5,850)
Property | Other |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 3,805 | 2,336
Property | Other Large and Small Catastrophic Events |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (500) |
Casualty and Specialty |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (3,791) | 30,262
Casualty and Specialty | Actuarial methods |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | (3,791) | (5,999)
Casualty and Specialty | Ogden Rate change |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | 0 | 33,481
Casualty and Specialty | Actuarial assumption changes |  |
Liability for Catastrophe Claims [Line Items] |  |
Net claims and claim expenses incurred – prior accident years | $ 0 | $ 2,780

X
- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueInputsDiscountRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + 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_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_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_LiabilityForCatastropheClaimsByCatastrophicEventAxis=rnr_LargeandSmallCatastropheEventsMember
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_CatastropheEvents2017Member
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_SmallCatastropheEventMember
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_OtherSmallCatastropheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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