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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) $ in Thousands | Sep. 30, 2017 USD ($)
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Trading Securities [Abstract] |
Amortized Cost, Due in less than one year | $ 366,988
Amortized Cost, Due after one through five years | 4,326,788
Amortized Cost, Due after five through ten years | 985,535
Amortized Cost, Due after ten years | 151,964
Amortized Cost | 7,061,487
Fair Value, Due in less than one year | 367,091
Fair Value, Due after one through five years | 4,324,948
Fair Value, Due after five through ten years | 1,001,975
Fair Value, Due after ten years | 153,764
Fair Value | 7,092,969
Mortgage-backed |
Trading Securities [Abstract] |
Amortized Cost | 1,047,676
Fair Value | 1,061,869
Asset-backed |
Trading Securities [Abstract] |
Amortized Cost | 182,536
Fair Value | $ 183,322

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
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Namespace Prefix: | rnr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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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- 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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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
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