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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost, Due in less than one year | $ 211,238 rnr_TradingSecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis |
Trading Debt Securities, Amortized Cost, Due after one through five years | 3,219,374 rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis |
Trading Debt Securities, Amortized Cost, Due after five through ten years | 1,018,158 rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis |
Trading Debt Securities, Amortized Cost, Due after ten years | 538,096 rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis |
Trading Debt Securities, Amortized Cost | 5,960,109 us-gaap_TradingSecuritiesDebtAmortizedCost |
Trading Debt Securities, Fair Value, Due in less than one year | 209,392 rnr_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue |
Trading Debt Securities, Fair Value, Due after one through five years | 3,220,154 rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Trading Debt Securities, Fair Value, Due after five through ten years | 1,018,252 rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Trading Debt Securities, Fair Value, Due after ten years | 544,522 rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Trading Debt Securities, Fair Value | 5,982,843 us-gaap_TradingSecurities |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost, Due in less than one year | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |
Available for Sale, Amortized Cost, Due after one through five years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |
Available for Sale, Amortized Cost, Due after five through ten years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |
Available for Sale, Amortized Cost, Due after ten years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |
Available for Sale, Amortized Cost | 22,156 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 23,772 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available for Sale, Fair Value, Due in less than one year | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
Available for Sale, Fair Value, Due after one through five years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Available for Sale, Fair Value, Due after five through ten years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Available for Sale, Fair Value, Due after ten years | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Available for Sale, Fair Value | 25,086 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 26,885 us-gaap_AvailableForSaleSecuritiesDebtSecurities
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost, Due in less than one year | 211,238 rnr_SecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis |
Debt Securities, Amortized Cost, Due after one through five years | 3,219,374 rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis |
Debt Securities, Amortized Cost, Due after five through ten years | 1,018,158 rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis |
Debt Securities, Amortized Cost, Due after ten years | 538,096 rnr_SecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis |
Debt Securities, Amortized Cost | 5,982,265 rnr_SecuritiesDebtAmortizedCostBasis |
Debt Securities, Fair Value, Due in less than one year | 209,392 rnr_SecuritiesDebtMaturitiesWithinOneYearFairValue |
Debt Securities, Fair Value, Due after one through give years | 3,220,154 rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Debt Securities, Fair Value, Due after five through ten years | 1,018,252 rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Debt Securities, Fair Value, Due after ten years | 544,522 rnr_SecuritiesDebtMaturitiesAfterTenYearsFairValue |
Debt Securities, Fair Value | 6,007,929 rnr_SecuritiesDebt |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 933,152 us-gaap_TradingSecuritiesDebtAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Trading Debt Securities, Fair Value | 950,337 us-gaap_TradingSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 19,218 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Available for Sale, Fair Value | 22,038 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 952,370 rnr_SecuritiesDebtAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Debt Securities, Fair Value | 972,375 rnr_SecuritiesDebt / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Asset-backed |  |
Trading Securities [Abstract] |  |
Trading Debt Securities, Amortized Cost | 40,091 us-gaap_TradingSecuritiesDebtAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Trading Debt Securities, Fair Value | 40,186 us-gaap_TradingSecurities / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Available-for-sale Securities [Abstract] |  |
Available for Sale, Amortized Cost | 2,938 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Available for Sale, Fair Value | 3,048 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed Maturity Investments [Abstract] |  |
Debt Securities, Amortized Cost | 43,029 rnr_SecuritiesDebtAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Debt Securities, Fair Value | $ 43,234 rnr_SecuritiesDebt / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests 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 + Details
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