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Aggregate notional amount of credit derivatives sold to manage exposure to credit risk. Notional amount refers to the number of contracts multiplied by the contract size as specified in the credit derivative contract.

No definition available.

Name:	rnr_NotionalAmountOfCreditRiskDerivativeSaleContracts
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Aggregate notional amount of interest rate futures contracts purchased to manage exposure to interest rate risk. Notional amount refers to the number of contracts multiplied by the contract size as specified in the interest rate futures contract.

No definition available.

Name:	rnr_NotionalAmountOfInterestRateDerivativePurchaseContracts
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Data Type:	xbrli:monetaryItemType
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Aggregate notional amount of interest rate futures contracts sold to manage exposure to interest rate risk. Notional amount refers to the number of contracts multiplied by the contract size as specified in the interest rate futures contract.

No definition available.

Name:	rnr_NotionalAmountOfInterestRateDerivativeSaleContracts
Namespace Prefix:	rnr_
Data Type:	xbrli:monetaryItemType
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- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
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Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959

Name:	us-gaap_NotionalAmountOfForeignCurrencyDerivativePurchaseContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Aggregate notional amount of foreign currency derivatives to sell a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.