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Investments (Schedule of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Investment Income [Line Items]
Gross investment income									$ 135,655us-gaap_InterestAndDividendIncomeOperating	$ 219,593us-gaap_InterestAndDividendIncomeOperating	$ 177,531us-gaap_InterestAndDividendIncomeOperating
Investment expenses									(11,339)us-gaap_InvestmentIncomeInvestmentExpense	(11,565)us-gaap_InvestmentIncomeInvestmentExpense	(11,806)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income	25,886us-gaap_NetInvestmentIncome	24,941us-gaap_NetInvestmentIncome	34,541us-gaap_NetInvestmentIncome	38,948us-gaap_NetInvestmentIncome	78,732us-gaap_NetInvestmentIncome	59,931us-gaap_NetInvestmentIncome	26,163us-gaap_NetInvestmentIncome	43,202us-gaap_NetInvestmentIncome	124,316us-gaap_NetInvestmentIncome	208,028us-gaap_NetInvestmentIncome	165,725us-gaap_NetInvestmentIncome
Fixed maturity investments
Net Investment Income [Line Items]
Gross investment income									100,855us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	95,907us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	103,330us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Short term investments
Net Investment Income [Line Items]
Gross investment income									944us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	1,698us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember	1,007us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_ShortTermInvestmentsMember
Equity investments
Net Investment Income [Line Items]
Gross investment income									3,450us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	2,295us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	1,086us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Other investments, Hedge funds and private equity investments
Net Investment Income [Line Items]
Gross investment income									18,867us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember	45,810us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember	36,635us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsHedgeFundsAndPrivateEquityInvestmentsMember
Other investments, Other
Net Investment Income [Line Items]
Gross investment income									11,144us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember	73,692us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember	35,196us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = rnr_OtherInvestmentsOtherMember
Cash and cash equivalents
Net Investment Income [Line Items]
Gross investment income									$ 395us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	$ 191us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	$ 277us-gaap_InterestAndDividendIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember

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- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.1-5)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 1, 2 , 3, 4, 5

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Amount of expenses related to the generation of investment income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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-Section S99

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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