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Investments (Reverse Purchase Agreements) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Investments, Debt and Equity Securities [Abstract] |  |
Value of reverse repurchase agreements | $ 132.7 | $ 57.6
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal | 102.00% |

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- Definition Securities Purchased Under Agreements To Resell Required Collateral Percentage Of Principal + References No definition available. + Details
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Namespace Prefix: | rnr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant