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Commitments, Contingencies and Other Items (Merger Agreement) (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 15, 2014 | Sep. 15, 2014 | Jun. 13, 2014 | Mar. 14, 2014 | Dec. 31, 2014 | Mar. 02, 2015 | Feb. 10, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 1 us-gaap_CommonStockParOrStatedValuePerShare | $ 1 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  | 1 us-gaap_CommonStockParOrStatedValuePerShare |  |
Dividends declared, Per common share | $ 1.16 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.12 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.08 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared, Per common share |  |  |  | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | $ 6,700,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |  |  |  |  |  | 6,700,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember |  |
Platinum | Common stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares to be issued for acquisition |  |  |  |  |  |  |  | 7,500,000 rnr_BusinessCombinationConsiderationTransferredExpectedEquityInterestsIssuedandIssuableShares / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |
Cash Election | Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash per share | $ 66 rnr_BusinessCombinationConsiderationTransferredCashPaidforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_CashElectionMember |  |  |  |  |  |  | 66 rnr_BusinessCombinationConsiderationTransferredCashPaidforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_CashElectionMember |  |
Share Election | Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common share per share | 0.6504 rnr_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuableNumberofSharesforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_ShareElectionMember |  |  |  |  |  |  | 0.6504 rnr_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuableNumberofSharesforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_ShareElectionMember |  |
Standard Election | Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash per share | $ 35.96 rnr_BusinessCombinationConsiderationTransferredCashPaidforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_StandardElectionMember |  |  |  |  |  |  | 35.96 rnr_BusinessCombinationConsiderationTransferredCashPaidforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_StandardElectionMember |  |
Common share per share | 0.2960 rnr_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuableNumberofSharesforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_StandardElectionMember |  |  |  |  |  |  | 0.2960 rnr_BusinessCombinationConsiderationTransferredEquityInterestsIssuedandIssuableNumberofSharesforEachShareofAcquiredEntitysSharesExpected / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = rnr_StandardElectionMember |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, face amount |  |  |  |  |  |  |  |  | 300,000,000 rnr_DebtInstrumentContingentlyIssuableFaceAmount / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Scenario, Forecast | Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  |  |  |  |  |  |  | 1,900,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  | $ 10,000,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Scenario, Forecast | Platinum |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends declared, Per common share |  |  |  |  |  |  |  |  |  | $ 10 us-gaap_CommonStockDividendsPerShareDeclared / dei_LegalEntityAxis = rnr_PlatinumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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