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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | $ 4,756,685 us-gaap_TradingSecuritiesDebt | $ 4,809,036 us-gaap_TradingSecuritiesDebt
U.S. treasuries |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 1,671,471 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember | 1,352,413 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Agencies |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 96,208 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AgencySecuritiesMember | 186,050 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AgencySecuritiesMember
Non-U.S. government (Sovereign Debt) |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 280,651 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember | 334,580 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignGovernmentDebtSecuritiesMember
Non-U.S. government-backed corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 146,467 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember | 237,479 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rnr_NonUSGovernmentBackedCorporateDebtSecuritiesMember
Corporate |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 1,610,442 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 1,803,415 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 312,333 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 336,661 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Non-agency mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 241,590 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 243,795 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Commercial mortgage-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | 373,117 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember | 303,214 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialMortgageBackedSecuritiesMember
Asset-backed |  |
Investment [Line Items] |  |
Fixed maturity investments trading, Fair value | $ 24,406 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember | $ 11,429 us-gaap_TradingSecuritiesDebt / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AssetBackedSecuritiesMember

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- Definition Amount of investments in debt securities classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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