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Reinsurance (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One
Concentration risk percentage	35.40%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember	28.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two
Concentration risk percentage	14.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember	19.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three
Concentration risk percentage	7.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember	11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = rnr_ReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One
Concentration risk percentage	17.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember	14.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerOneMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two
Concentration risk percentage	4.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember	12.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerTwoMember
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three
Concentration risk percentage	2.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember	3.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AllowanceForReinsuranceRecoverableMember / us-gaap_ConcentrationRiskByTypeAxis = rnr_CustomerConcentrationRiskCustomerThreeMember
Allowance for Reinsurance Recoverable
Valuation allowance recorded against reinsurance recoverable	1.0us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForReinsuranceRecoverableMember	1.7us-gaap_ValuationAllowancesAndReservesBalance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForReinsuranceRecoverableMember

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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-Publisher SEC

-Name Regulation S-X (SX)

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