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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) $ in Thousands | Jun. 30, 2017 USD ($)
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Trading Securities [Abstract] |
Amortized Cost, Due in less than one year | $ 428,307
Amortized Cost, Due after one through five years | 4,112,662
Amortized Cost, Due after five through ten years | 1,137,632
Amortized Cost, Due after ten years | 168,920
Amortized Cost | 7,257,020
Fair Value, Due in less than one year | 427,683
Fair Value, Due after one through five years | 4,111,191
Fair Value, Due after five through ten years | 1,153,811
Fair Value, Due after ten years | 170,578
Fair Value | 7,282,264
Mortgage-backed |
Trading Securities [Abstract] |
Amortized Cost | 1,218,486
Fair Value | 1,227,438
Asset-backed |
Trading Securities [Abstract] |
Amortized Cost | 191,013
Fair Value | $ 191,563

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
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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 five through ten 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 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
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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_
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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
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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 ten 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
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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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Data Type: | xbrli:monetaryItemType
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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
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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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X
- Details
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X
- Details
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