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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details) (USD $) | 12 Months Ended | 81 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 20, 2014 | Jul. 01, 2013 | May 31, 2010 D | Dec. 31, 2010 | Aug. 31, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |  |  |  |  |
Total fair value of shares and share units vested | $ 48,700,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ 47,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ 43,300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue |  |  |  |  |
Cash received from exercises of stock options during the period | 500,000 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 1,600,000 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions | 900,000 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions |  |  |  |  |
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities |  |  |  |  |  |  |
Total stock compensation expense recognized | 37,600,000 us-gaap_ShareBasedCompensation | 43,400,000 us-gaap_ShareBasedCompensation | 38,400,000 us-gaap_ShareBasedCompensation |  |  |  |  |
Contributions to defined contribution pension plans | 3,600,000 us-gaap_DefinedContributionPlanCostRecognized | 3,500,000 us-gaap_DefinedContributionPlanCostRecognized | 3,400,000 us-gaap_DefinedContributionPlanCostRecognized |  |  |  |  |
Premium Option Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock incentive compensation, vesting period |  |  |  | 5 years |  |  |  |
Shares reserved for issuance under Premium Option Plan |  |  |  |  |  |  |  | 6,000,000.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Minimum strike price as a percentage of market value on grant date |  |  |  | 150.00%rnr_ShareBasedCompensationByShareBasedPaymentAwardOptionsMinimumStrikePriceAsPercentageOfMarketValueOnGrantDate / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |  |
Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock incentive compensation, vesting period |  |  |  |  | 4 years | 3 years |  |
Number of shares available for grant |  |  |  |  |  | 750,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = us-gaap_PerformanceSharesMember |  |
Percentage of annual equity incentive award grants, subject to vesting conditions |  |  |  |  |  | 25.00%rnr_PercentageOfAnnualEquityIncentiveSubjectToVestingConditions / us-gaap_PlanNameAxis = us-gaap_PerformanceSharesMember |  |
Vesting maximum as a percentage of target if performance goal are achieved |  |  |  |  | 250.00%rnr_VestingMaximumAsPercentageOfTargetIfPerformanceGoalsAreAchieved / us-gaap_PlanNameAxis = us-gaap_PerformanceSharesMember | 250.00%rnr_VestingMaximumAsPercentageOfTargetIfPerformanceGoalsAreAchieved / us-gaap_PlanNameAxis = us-gaap_PerformanceSharesMember |  |
Period for average closing share price to determine total shareholder return |  |  |  |  |  | 20 rnr_ComparativePeriodforPerformanceAward / us-gaap_PlanNameAxis = us-gaap_PerformanceSharesMember |  |
Employee Stock Option | 2001 Stock Incentive Plans and Nonemployee Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |  |  |  |  |
Share-based payment award, Expiration period | 10 years |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs related to restricted stock awards | 21,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 7 months 6 days |  |  |  |  |  |  |
Cash Settled Restricted Stock Unit (CSRSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock incentive compensation, vesting period |  |  |  |  |  |  | 4 years |
Number of shares available for grant |  |  |  |  |  |  | 900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = rnr_CashSettledRestrictedStockUnitMember |
Expected forfeiture rate | 11.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = rnr_CashSettledRestrictedStockUnitMember | 13.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = rnr_CashSettledRestrictedStockUnitMember |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected forfeiture rate | 0.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |  |
Unrecognized compensation costs related to restricted stock awards | 4,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 10 months 24 days |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected forfeiture rate | 2.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 30,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 9 months 18 days |  |  |  |  |  |  |
Restricted Stock | 2001 Stock Incentive Plans and Nonemployee Directors |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |  |  |  |  |

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- Definition Total shareholder return is based on the average closing share price over the specified number of trading days preceding and including the start and end of the performance period. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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