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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Trading Securities [Abstract] |  |
Fixed maturity investments trading, Due in less than one year, Amortized cost | $ 547,468 |
Fixed maturity investments trading, Due after one through five years, Amortized cost | 4,551,757 |
Fixed maturity investments trading, Due after five through ten years, Amortized cost | 997,163 |
Fixed maturity investments trading, Due after ten years, Amortized cost | 163,188 |
Fixed maturity investments trading, Amortized cost | 7,434,870 | $ 6,920,690
Fixed maturity investments trading, Due in less than one year, Fair value | 546,255 |
Fixed maturity investments trading, Due after one through five years, Fair value | 4,521,930 |
Fixed maturity investments trading, Due after five through ten years, Fair value | 1,007,656 |
Fixed maturity investments trading, Due after ten years, Fair value | 165,140 |
Fixed maturity investments trading, Fair value | 7,426,555 |
Mortgage-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 993,005 |
Fixed maturity investments trading, Fair value | 1,002,849 |
Asset-backed |  |
Trading Securities [Abstract] |  |
Fixed maturity investments trading, Amortized cost | 182,289 |
Fixed maturity investments trading, Fair value | $ 182,725 |

X
- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one through 5 years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCostBasis
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of debt securities which are expected to mature after five through ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCostBasis
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of debt securities which are expected to mature after one through five years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature after ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsAmortizedCostBasis
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of debt securities which are expected to mature after ten years of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents debt securities, at cost, net of adjustments including accretion, amortization and collection of cash, if any, which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
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Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and are categorized as trading securities. + References No definition available. + Details
Name: | rnr_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: 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 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=82896770&loc=d3e26610-111562 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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X
- References No definition available. + Details
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X
- Definition Amortized cost of investments in debt securities classified as trading. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Details
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X
- Details
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