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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Trading Securities [Abstract] |  |
Fixed maturity investments trading, Due in less than one year, Amortized cost | $ 153,250 rnr_TradingSecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis |
Fixed maturity investments trading, Due after one through five years, Amortized cost | 2,976,602 rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis |
Fixed maturity investments trading, Due after five through ten years, Amortized cost | 544,285 rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis |
Fixed maturity investments trading, Due after ten years, Amortized cost | 140,294 rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis |
Fixed maturity investments trading, Amortized cost | 4,749,613 us-gaap_TradingSecuritiesDebtAmortizedCost | 4,781,712 us-gaap_TradingSecuritiesDebtAmortizedCost
Fixed maturity investments trading, Due in less than one year, Fair value | 151,803 rnr_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue |
Fixed maturity investments trading, Due after one through five years, Fair value | 2,969,828 rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Fixed maturity investments trading, Due after five through ten years, Fair value | 537,636 rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Fixed maturity investments trading, Due after ten years, Fair value | 145,972 rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Fixed maturity investments trading, Fair value | 4,756,685 us-gaap_TradingSecurities |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Due in less than one year, Amortized Cost | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |
Fixed maturity investments available-for-sale, Due after one through five years, Amortized cost | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |
Fixed maturity investments available-for-sale, Due after five through ten years, Amortized cost | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |
Fixed maturity investments available-for-sale, Due after ten years, Amortized cost | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |
Fixed maturity investments available-for-sale, Amortized cost | 23,772 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 30,273 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fixed maturity investments available-for-sale, Due in less than one year, Fair value | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
Fixed maturity investments available-for-sale, Due after one through five years, Fair value | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Fixed maturity investments available-for-sale, Due after five through ten years, Fair value | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Fixed maturity investments available-for-sale, Due after ten years, Fair value | 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |
Fixed maturity investments available-for-sale, Fair value | 26,885 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 34,241 us-gaap_AvailableForSaleSecuritiesDebtSecurities
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Due in less than one year, Amortized cost | 153,250 rnr_SecuritiesDebtMaturitiesWithinOneYearAmortizedCostBasis |
Fixed maturity investments, Due after one through five years, Amortized cost | 2,976,602 rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis |
Fixed maturity investments, Due after five through ten years, Amortized cost | 544,285 rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis |
Fixed maturity investments, Due after ten years, Amortized cost | 140,294 rnr_SecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis |
Fixed maturity investments, Amortized cost | 4,773,385 rnr_SecuritiesDebtAmortizedCostBasis |
Fixed maturity investments, Due in less than one year, Fair value | 151,803 rnr_SecuritiesDebtMaturitiesWithinOneYearFairValue |
Fixed maturity investments, Due after one through give years, Fair value | 2,969,828 rnr_SecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |
Fixed maturity investments, Due after five through ten years, Fair value | 537,636 rnr_SecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |
Fixed maturity investments, Due after ten years, Fair value | 145,972 rnr_SecuritiesDebtMaturitiesAfterTenYearsFairValue |
Fixed maturity investments, Fair value | 4,783,570 rnr_SecuritiesDebt |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 910,897 us-gaap_TradingSecuritiesDebtAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Fixed maturity investments trading, Fair value | 927,040 us-gaap_TradingSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Amortized cost | 20,697 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Fixed maturity investments available-for-sale, Fair value | 23,681 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Amortized cost | 931,594 rnr_SecuritiesDebtAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Fixed maturity investments, Fair value | 950,721 rnr_SecuritiesDebt / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesMember |
Asset-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 24,285 us-gaap_TradingSecuritiesDebtAmortizedCost / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed maturity investments trading, Fair value | 24,406 us-gaap_TradingSecurities / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Available-for-sale Securities [Abstract] |  |
Fixed maturity investments available-for-sale, Amortized cost | 3,075 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed maturity investments available-for-sale, Fair value | 3,204 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed Maturity Investments [Abstract] |  |
Fixed maturity investments, Amortized cost | 27,360 rnr_SecuritiesDebtAmortizedCostBasis / us-gaap_DebtSecurityAxis = us-gaap_AssetBackedSecuritiesMember |
Fixed maturity investments, Fair value | $ 27,610 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 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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