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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income available to RenaissanceRe common shareholders	$ 170,767us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 67,815us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 120,752us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 151,003us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 268,656us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 179,740us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 26,806us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 190,474us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 510,337us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 665,676us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 566,014us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Amount allocated to participating common shareholders									(6,760)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	(9,520)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	(8,973)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income allocated to RenaissanceRe common shareholders									$ 503,577us-gaap_UndistributedEarnings	$ 656,156us-gaap_UndistributedEarnings	$ 557,041us-gaap_UndistributedEarnings
Denominator:
Denominator for basic income per RenaissanceRe common share - weighted average common shares (In shares)	37,752us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,975us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,736us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,238us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,160us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,330us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,372us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,461us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,425us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	43,349us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	48,873us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Per common share equivalents of employee stock options and restricted shares (In shares)									543us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	779us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	730us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (In shares)	38,145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,433us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	40,395us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	41,903us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	43,769us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,135us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,243us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,290us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,968us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,128us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	49,603us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic income per RenaissanceRe common share (In dollars per share)	$ 4.46us-gaap_EarningsPerShareBasic	$ 1.72us-gaap_EarningsPerShareBasic	$ 3.00us-gaap_EarningsPerShareBasic	$ 3.61us-gaap_EarningsPerShareBasic	$ 6.14us-gaap_EarningsPerShareBasic	$ 4.09us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic	$ 4.32us-gaap_EarningsPerShareBasic	$ 12.77us-gaap_EarningsPerShareBasic	$ 15.14us-gaap_EarningsPerShareBasic	$ 11.40us-gaap_EarningsPerShareBasic
Diluted income per RenaissanceRe common share (In dollars per share)	$ 4.42us-gaap_EarningsPerShareDiluted	$ 1.70us-gaap_EarningsPerShareDiluted	$ 2.95us-gaap_EarningsPerShareDiluted	$ 3.56us-gaap_EarningsPerShareDiluted	$ 6.05us-gaap_EarningsPerShareDiluted	$ 4.01us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 4.23us-gaap_EarningsPerShareDiluted	$ 12.60us-gaap_EarningsPerShareDiluted	$ 14.87us-gaap_EarningsPerShareDiluted	$ 11.23us-gaap_EarningsPerShareDiluted

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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