Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Total investments	$ 6,743,750us-gaap_Investments	$ 6,821,712us-gaap_Investments
Cash and cash equivalents	525,584	408,032	304,145	181,825
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0us-gaap_DueFromRelatedParties	0us-gaap_DueFromRelatedParties
Premiums receivable	440,007	474,087
Prepaid reinsurance premiums	94,810us-gaap_PrepaidReinsurancePremiums	66,132us-gaap_PrepaidReinsurancePremiums
Reinsurance recoverable	66,694us-gaap_ReinsuranceRecoverables	101,025us-gaap_ReinsuranceRecoverables	192,512us-gaap_ReinsuranceRecoverables
Accrued investment income	26,509	34,065
Deferred acquisition costs	110,059us-gaap_DeferredPolicyAcquisitionCosts	81,684us-gaap_DeferredPolicyAcquisitionCosts
Receivable for investments sold	52,390	75,845
Other assets	143,747rnr_OtherAssetsNet	116,549rnr_OtherAssetsNet
Total assets	8,203,550us-gaap_Assets	8,179,131us-gaap_Assets
Liabilities
Reserve for claims and claim expenses	1,412,510	1,563,730	1,879,377
Unearned premiums	512,386us-gaap_UnearnedPremiums	477,888us-gaap_UnearnedPremiums
Debt	249,522us-gaap_NotesAndLoansPayable	249,430us-gaap_NotesAndLoansPayable
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	454,580us-gaap_ReinsurancePayable	293,022us-gaap_ReinsurancePayable
Payable for investments purchased	203,021	193,221
Other liabilities	374,108us-gaap_OtherLiabilities	397,596us-gaap_OtherLiabilities
Total liabilities	3,206,127us-gaap_Liabilities	3,174,887us-gaap_Liabilities
Redeemable noncontrolling interests	1,131,708	1,099,860
Shareholders' Equity
Total shareholders’ equity	3,865,715	3,904,384	3,507,056
Total liabilities, noncontrolling interests and shareholders’ equity	8,203,550	8,179,131
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	137,006	210,719
Cash and cash equivalents	5,986	8,796	6,298	10,606
Investments in subsidiaries	3,509,974	3,294,729
Due from subsidiaries and affiliates	126,548	296,752
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	10	14
Other assets	112,400	112,234
Total assets	3,891,924	3,923,244
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	6,000	0
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	20,209	18,860
Total liabilities	26,209	18,860
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	3,865,715	3,904,384
Total liabilities, noncontrolling interests and shareholders’ equity	3,891,924	3,923,244
RenRe North America Holdings Inc. (Subsidiary Issuer)
Assets
Total investments	88,150	98,784
Cash and cash equivalents	1,033	4,027	1,528	4,920
Investments in subsidiaries	71,796	74,718
Due from subsidiaries and affiliates	23	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	121	110
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	1,242	1,481
Total assets	162,365	179,120
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	249,522	249,430
Amounts due to subsidiaries and affiliates	233	3,173
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	4,013	6,953
Total liabilities	253,768	259,556
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	(91,403)	(80,436)
Total liabilities, noncontrolling interests and shareholders’ equity	162,365	179,120
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	6,518,594	6,512,209
Cash and cash equivalents	518,565	395,209	296,319	166,299
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	440,007	474,087
Prepaid reinsurance premiums	94,810	66,132
Reinsurance recoverable	66,694	101,025
Accrued investment income	26,388	33,955
Deferred acquisition costs	110,059	81,684
Receivable for investments sold	52,380	75,831
Other assets	131,563	102,834
Total assets	7,959,060	7,842,966
Liabilities
Reserve for claims and claim expenses	1,412,510	1,563,730
Unearned premiums	512,386	477,888
Debt	0	0
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	454,580	293,022
Payable for investments purchased	203,021	193,221
Other liabilities	351,344	371,783
Total liabilities	2,933,841	2,899,644
Redeemable noncontrolling interests	1,131,708	1,099,860
Shareholders' Equity
Total shareholders’ equity	3,893,511	3,843,462
Total liabilities, noncontrolling interests and shareholders’ equity	7,959,060	7,842,966
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(3,581,770)	(3,369,447)
Due from subsidiaries and affiliates	(126,571)	(296,752)
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	(101,458)	(100,000)
Total assets	(3,809,799)	(3,766,199)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	(6,233)	(3,173)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(1,458)	0
Total liabilities	(7,691)	(3,173)
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	(3,802,108)	(3,763,026)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (3,809,799)	$ (3,766,199)

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.

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-Topic 944

-SubTopic 210

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Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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-Section 45

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Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.

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