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Stock Incentive Compensation and Employee Benefit Plans (Schedule of Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
2001 Stock Incentive Plans and Nonemployee Directors |  |  |  |
Weighted options outstanding: |  |  |  |
Balance, Beginning of Period (shares) | 828,092 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 1,732,639 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 1,973,307 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options forfeited (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options expired (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options exercised (in shares) | (60,262)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | (904,547)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | (240,668)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Balance, End of Period (shares) | 767,830 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 828,092 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 1,732,639 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 1,973,307 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember
Weighted average exercise price: |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 48.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 47.61 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 47.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options granted, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options forfeited, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options expired, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Options exercised, Weighted average exercise price (In dollars per share) | $ 49.52 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 46.55 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 45.30 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Weighted average exercise price, End of Period (In dollars per share) | $ 48.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 48.77 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 47.61 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 47.33 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember
Weighted average remaining contractual life | 2 years | 2 years 10 months 24 days | 3 years 8 months | 4 years 7 months
Aggregate Intrinsic Value [Abstract] |  |  |  |
Aggregate intrinsic value | $ 37,246 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 40,221 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 58,305 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 53,363 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember
Options exercised, Aggregate intrinsic value | 2,900 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 36,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | 7,910 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |
Range of Exercise Prices [Abstract] |  |  |  |
Exercise price range, lower range limit (In dollars per share) | $ 37.51 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 37.51 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 37.51 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 37.51 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember
Exercise price range, upper range limit (In dollars per share) | $ 59.66 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 59.66 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 59.66 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember | $ 59.66 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember
Total options exercisable, minimum (In dollars per share) | $ 37.51 rnr_ShareBasedCompensationSharesExercisableExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |  |  |
Total options exercisable, maximum (In dollars per share) | $ 59.66 rnr_ShareBasedCompensationSharesExercisableExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |  |  |
Total options exercisable (in shares) | 767,830 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |  |  |
Total options exercisable, Weighted average exercise price (In dollars per share) | $ 48.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |  |  |
Total options exercisable, Weighted average remaining contractual life | 2 years |  |  |
Total options exercisable, Aggregate intrinsic value | 37,246 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_PlanNameAxis = rnr_A2001StockIncentiveandNonemployeeDirectorStockIncentivePlansMember |  |  |
Premium Option Plan |  |  |  |
Weighted options outstanding: |  |  |  |
Balance, Beginning of Period (shares) | 572,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 842,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 1,192,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options forfeited (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options expired (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options exercised (in shares) | (572,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | (270,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | (350,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Balance, End of Period (shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 572,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 842,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 1,192,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Weighted average exercise price: |  |  |  |
Weighted average exercise price, Beginning of Period (In dollars per share) | $ 73.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options granted, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options forfeited, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options expired, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Options exercised, Weighted average exercise price (In dollars per share) | $ 73.62 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 74.24 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 74.24 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Weighted average exercise price, End of Period (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.82 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Weighted average remaining contractual life | 0 years |  |  |
Aggregate Intrinsic Value [Abstract] |  |  |  |
Aggregate intrinsic value | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 13,567 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 6,265 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Options exercised, Aggregate intrinsic value | 13,414 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 4,921 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | 1,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |
Range of Exercise Prices [Abstract] |  |  |  |
Exercise price range, lower range limit (In dollars per share) | $ 0 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.06 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.06 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 73.06 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Exercise price range, upper range limit (In dollars per share) | $ 0 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 74.24 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 74.24 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember | $ 74.24 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember
Total options exercisable, minimum (In dollars per share) | $ 0 rnr_ShareBasedCompensationSharesExercisableExercisePriceRangeLowerRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |
Total options exercisable, maximum (In dollars per share) | $ 0 rnr_ShareBasedCompensationSharesExercisableExercisePriceRangeUpperRangeLimit / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |
Total options exercisable (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |
Total options exercisable, Weighted average exercise price (In dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |
Total options exercisable, Weighted average remaining contractual life | 0 years |  |  |
Total options exercisable, Aggregate intrinsic value | $ 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_PlanNameAxis = rnr_PremiumOptionPlanMember |  |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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