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Stock Incentive Compensation and Employee Benefit Plans (Schedule of Valuation Assumptions) (Details) (Performance Shares) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected volatility rate, minimum | 14.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 19.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Expected volatility rate, maximum | 18.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 19.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Risk free interest rate, minimum | 0.08%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0.09%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Risk free interest rate, maximum | 1.65%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 1.39%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Expected term | 1 year |
Expected forfeiture rate | 0.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0.00%rnr_ShareBasedCompensationArrangementsByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Performance Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate + References No definition available. + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Details
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