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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$ 888,526	$ 601,702
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	8,221,481	7,663,002
Purchases of fixed maturity investments trading	(8,692,688)	(7,798,285)
Net (purchases) sales of equity investments trading	15,490	61,571
Net purchases of short term investments	(1,465,451)	(146,326)
Net purchases of other investments	(130,649)	5,181
Net purchases of investments in other ventures	(20,952)	0
Return of investment from investment in other ventures	8,464	20,000
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net cash used in investing activities	(2,064,305)	(194,857)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(39,611)	(38,624)
Dividends paid – preference shares	(20,899)	(16,786)
Issuance of preference shares, net of expenses	242,371	0
RenaissanceRe common share repurchases	0	(188,591)
Repayment of debt		(250,000)
Issuance of debt, net of expenses	0	295,866
Net third party redeemable noncontrolling interest share transactions	96,021	(44,193)
Taxes paid on withholding shares	(7,079)	(13,694)
Net cash provided by (used in) financing activities	270,803	(256,022)
Effect of exchange rate changes on foreign currency cash	(3,575)	9,596
Net (decrease) increase in cash and cash equivalents	(908,551)	160,419
Cash and cash equivalents, beginning of period	1,361,592	421,157
Cash and cash equivalents, end of period	453,041	581,576
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	1,496	(8,209)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	91,118	74,455
Purchases of fixed maturity investments trading	(65,988)	(69,168)
Net (purchases) sales of equity investments trading	(624)	(1,708)
Net purchases of short term investments	360	(4,495)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0
Return of investment from investment in other ventures	0	0
Dividends and return of capital from subsidiaries	0	9,175
Contributions to subsidiaries	(16,847)	0
Due (from) to subsidiary	(9,598)	14
Net cash used in investing activities	(1,579)	8,273
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of preference shares, net of expenses	0
RenaissanceRe common share repurchases		0
Repayment of debt		0
Issuance of debt, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by (used in) financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net (decrease) increase in cash and cash equivalents	(83)	64
Cash and cash equivalents, beginning of period	139	162
Cash and cash equivalents, end of period	56	226
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities		(2,262)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading		289,741
Purchases of fixed maturity investments trading		(143,991)
Net (purchases) sales of equity investments trading		85,324
Net purchases of short term investments		41,299
Net purchases of other investments		0
Return of investment from investment in other ventures		0
Dividends and return of capital from subsidiaries		0
Contributions to subsidiaries		(26,649)
Due (from) to subsidiary		(123)
Net cash used in investing activities		245,601
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares		0
Dividends paid – preference shares		0
RenaissanceRe common share repurchases		0
Repayment of debt		(250,000)
Issuance of debt, net of expenses		0
Net third party redeemable noncontrolling interest share transactions		0
Taxes paid on withholding shares		0
Net cash provided by (used in) financing activities		(250,000)
Effect of exchange rate changes on foreign currency cash		0
Net (decrease) increase in cash and cash equivalents		(6,661)
Cash and cash equivalents, beginning of period		6,671
Cash and cash equivalents, end of period		10
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	16,194	(343,093)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	45,459	279,830
Purchases of fixed maturity investments trading	(20,806)	(270,785)
Net (purchases) sales of equity investments trading	0	0
Net purchases of short term investments	(9,206)	(305)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0
Return of investment from investment in other ventures	0	0
Dividends and return of capital from subsidiaries	0	41,866
Contributions to subsidiaries	(65,000)	(9,175)
Due (from) to subsidiary	36,262	4,062
Net cash used in investing activities	(13,291)	45,493
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of preference shares, net of expenses	0
RenaissanceRe common share repurchases		0
Repayment of debt		0
Issuance of debt, net of expenses		295,866
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by (used in) financing activities	0	295,866
Effect of exchange rate changes on foreign currency cash	0	0
Net (decrease) increase in cash and cash equivalents	2,903	(1,734)
Cash and cash equivalents, beginning of period	1,469	9,397
Cash and cash equivalents, end of period	4,372	7,663
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(5,869)	(6,870)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	384,818	106,761
Purchases of fixed maturity investments trading	(281,994)	(118,402)
Net (purchases) sales of equity investments trading	0	0
Net purchases of short term investments	85,598	205,864
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0
Return of investment from investment in other ventures	0	0
Dividends and return of capital from subsidiaries	511,098	285,515
Contributions to subsidiaries	(686,106)	(500,000)
Due (from) to subsidiary	(193,249)	290,130
Net cash used in investing activities	(179,835)	269,868
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(39,611)	(38,624)
Dividends paid – preference shares	(20,899)	(16,786)
Issuance of preference shares, net of expenses	242,371
RenaissanceRe common share repurchases		(188,591)
Repayment of debt		0
Issuance of debt, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(7,079)	(13,694)
Net cash provided by (used in) financing activities	174,782	(257,695)
Effect of exchange rate changes on foreign currency cash	0	0
Net (decrease) increase in cash and cash equivalents	(10,922)	5,303
Cash and cash equivalents, beginning of period	14,656	7,067
Cash and cash equivalents, end of period	3,734	12,370
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	876,705	962,136
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	7,700,086	6,912,215
Purchases of fixed maturity investments trading	(8,323,900)	(7,195,939)
Net (purchases) sales of equity investments trading	16,114	(22,045)
Net purchases of short term investments	(1,542,203)	(388,689)
Net purchases of other investments	(130,649)	5,181
Net purchases of investments in other ventures	(20,952)
Return of investment from investment in other ventures	8,464	20,000
Dividends and return of capital from subsidiaries	(511,098)	(336,556)
Contributions to subsidiaries	767,953	535,824
Due (from) to subsidiary	166,585	(294,083)
Net cash used in investing activities	(1,869,600)	(764,092)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of preference shares, net of expenses	0
RenaissanceRe common share repurchases		0
Repayment of debt		0
Issuance of debt, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	96,021	(44,193)
Taxes paid on withholding shares	0	0
Net cash provided by (used in) financing activities	96,021	(44,193)
Effect of exchange rate changes on foreign currency cash	(3,575)	9,596
Net (decrease) increase in cash and cash equivalents	(900,449)	163,447
Cash and cash equivalents, beginning of period	1,345,328	397,860
Cash and cash equivalents, end of period	$ 444,879	$ 561,307

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- Definition

Amount of cash inflow (outflow) from sales and purchases of trading securities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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- Definition

The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

+ References

No definition available.

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