Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets
Total investments	$ 9,010,217	$ 8,999,068
Cash and cash equivalents	455,521	506,885	$ 398,090	$ 525,584
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,332,667	778,009
Prepaid reinsurance premiums	533,092	230,671
Reinsurance recoverable	222,006	134,526
Accrued investment income	37,900	39,749
Deferred acquisition costs	331,152	199,380
Receivable for investments sold	203,165	220,834
Other assets	160,873	181,011
Goodwill and other intangible assets	258,170	265,154
Total assets	12,544,763	11,555,287
Liabilities
Reserve for claims and claim expenses	2,844,243	2,767,045
Unearned premiums	1,518,106	889,102
Debt	954,577	960,495
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	753,699	523,974
Payable for investments purchased	432,926	391,378
Other liabilities	215,592	245,145
Total liabilities	6,719,143	5,777,139
Redeemable noncontrolling interests	1,122,403	1,045,964
Shareholders' Equity
Total shareholders’ equity	4,703,217	4,732,184
Total liabilities, noncontrolling interests and shareholders’ equity	12,544,763	11,555,287
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	172,593	349,892
Cash and cash equivalents	2,382	10,185	11,716	5,986
Investments in subsidiaries	4,022,891	3,902,519
Due from subsidiaries and affiliates	104,582	81,282
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	323	1,253
Deferred acquisition costs	0	0
Receivable for investments sold	32	26
Other assets	402,158	390,302
Goodwill and other intangible assets	133,736	137,064
Total assets	4,838,697	4,872,523
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	117,000	117,000
Amounts due to subsidiaries and affiliates	138	2,641
Reinsurance balances payable	0	0
Payable for investments purchased	0	999
Other liabilities	18,342	19,699
Total liabilities	135,480	140,339
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	4,703,217	4,732,184
Total liabilities, noncontrolling interests and shareholders’ equity	4,838,697	4,872,523
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Assets
Total investments	123,921	127,087
Cash and cash equivalents	35	5,908	2,146	1,033
Investments in subsidiaries	46,835	48,754
Due from subsidiaries and affiliates	84,027	69,739
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	308	169
Deferred acquisition costs	0	0
Receivable for investments sold	1	1
Other assets	27,115	29,532
Goodwill and other intangible assets	0	0
Total assets	282,242	281,190
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	94	202
Reinsurance balances payable	0	0
Payable for investments purchased	57	6
Other liabilities	(359)	1,148
Total liabilities	(208)	1,356
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	282,450	279,834
Total liabilities, noncontrolling interests and shareholders’ equity	282,242	281,190
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	280,615	205,777
Cash and cash equivalents	1,893	7,103	1,089	0
Investments in subsidiaries	902,329	867,909
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	434	348
Deferred acquisition costs	0	0
Receivable for investments sold	14	68,537
Other assets	11,684	12,852
Goodwill and other intangible assets	0	0
Total assets	1,196,969	1,162,526
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	261,774	268,196
Amounts due to subsidiaries and affiliates	112	204
Reinsurance balances payable	0	0
Payable for investments purchased	85	25
Other liabilities	9,689	6,620
Total liabilities	271,660	275,045
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	925,309	887,481
Total liabilities, noncontrolling interests and shareholders’ equity	1,196,969	1,162,526
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	0	0
Cash and cash equivalents	614	677	224	0
Investments in subsidiaries	1,226,829	1,185,736
Due from subsidiaries and affiliates	0	0
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	121,277	115,456
Goodwill and other intangible assets	0	0
Total assets	1,348,720	1,301,869
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	545,537	545,187
Amounts due to subsidiaries and affiliates	92,338	68,204
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	0	0
Total liabilities	637,875	613,391
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	710,845	688,478
Total liabilities, noncontrolling interests and shareholders’ equity	1,348,720	1,301,869
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	8,433,088	8,316,312
Cash and cash equivalents	450,597	483,012	$ 382,915	$ 518,565
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,332,667	778,009
Prepaid reinsurance premiums	533,092	230,671
Reinsurance recoverable	222,006	134,526
Accrued investment income	36,835	37,979
Deferred acquisition costs	331,152	199,380
Receivable for investments sold	203,118	152,270
Other assets	107,850	124,215
Goodwill and other intangible assets	124,434	128,090
Total assets	11,774,839	10,584,464
Liabilities
Reserve for claims and claim expenses	2,844,243	2,767,045
Unearned premiums	1,518,106	889,102
Debt	147,266	147,112
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	753,699	523,974
Payable for investments purchased	432,784	390,348
Other liabilities	198,942	222,320
Total liabilities	5,895,040	4,939,901
Redeemable noncontrolling interests	1,122,403	1,045,964
Shareholders' Equity
Total shareholders’ equity	4,757,396	4,598,599
Total liabilities, noncontrolling interests and shareholders’ equity	11,774,839	10,584,464
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(6,198,884)	(6,004,918)
Due from subsidiaries and affiliates	(188,609)	(151,021)
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	(509,211)	(491,346)
Goodwill and other intangible assets	0	0
Total assets	(6,896,704)	(6,647,285)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	(117,000)	(117,000)
Amounts due to subsidiaries and affiliates	(92,682)	(71,251)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(11,022)	(4,642)
Total liabilities	(220,704)	(192,893)
Redeemable noncontrolling interests	0	0
Shareholders' Equity
Total shareholders’ equity	(6,676,000)	(6,454,392)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (6,896,704)	$ (6,647,285)