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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, 2020	Sep. 30, 2019
Cash flows provided by (used in) operating activities
Net cash provided by (used in) operating activities	$ 1,329,779	$ 1,264,432
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	11,564,999	12,835,916
Purchases of fixed maturity investments trading	(13,114,732)	(13,403,711)
Net sales of equity investments trading	1,842	(6,937)
Net purchases of short term investments	(549,218)	(1,362,151)
Net purchases of other investments	(101,302)	(130,476)
Net purchases of investments in other ventures	(2,407)	(2,341)
Net purchase of other assets	0	(4,108)
Return of investment from investment in other ventures	9,255	11,250
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net proceeds from RenaissanceRe UK	136,744	0
Net purchase of TMR	0	(276,206)
Net cash used in investing activities	(2,054,819)	(2,338,764)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(50,785)	(44,547)
Dividends paid – preference shares	(23,634)	(27,567)
RenaissanceRe common share issuance, net of expenses	1,095,507	0
Issuance of debt, net of expenses	0	396,411
RenaissanceRe common share repurchases	(62,621)	0
Redemption of 6.08% Series C preference shares	(125,000)	0
Repayment of debt	(250,000)	0
Net third-party redeemable noncontrolling interest share transactions	59,104	515,952
Taxes paid on withholding shares	(10,264)	(7,229)
Net cash provided by financing activities	632,307	833,020
Effect of exchange rate changes on foreign currency cash	1,043	4,641
Net decrease in cash and cash equivalents	(91,690)	(236,671)
Cash and cash equivalents, beginning of period	1,379,068	1,107,922
Cash and cash equivalents, end of period	$ 1,287,378	871,251
Series C Preference Shares
Cash flows provided by financing activities
Dividend rate, percentage	6.08%
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Cash flows provided by (used in) operating activities
Net cash provided by (used in) operating activities	$ (47,993)	(30,943)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	36,302	43,746
Purchases of fixed maturity investments trading	(45,955)	(15,910)
Net sales of equity investments trading	0	0
Net purchases of short term investments	266,199	(16,257)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Net purchase of other assets		0
Return of investment from investment in other ventures	0	0
Dividends and return of capital from subsidiaries	118,026	13,500
Contributions to subsidiaries	(130,000)	0
Due (from) to subsidiary	55,815	(416)
Net proceeds from RenaissanceRe UK	0
Net purchase of TMR		0
Net cash used in investing activities	300,387	24,663
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share issuance, net of expenses	0
Issuance of debt, net of expenses		0
RenaissanceRe common share repurchases	0
Redemption of 6.08% Series C preference shares	0
Repayment of debt	(250,000)
Net third-party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	(250,000)	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	2,394	(6,280)
Cash and cash equivalents, beginning of period	8,731	9,604
Cash and cash equivalents, end of period	11,125	3,324
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) operating activities
Net cash provided by (used in) operating activities	19,787	(381,508)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	210,973	277,030
Purchases of fixed maturity investments trading	(346,002)	(66,740)
Net sales of equity investments trading	0	0
Net purchases of short term investments	72,479	(34,209)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Net purchase of other assets		0
Return of investment from investment in other ventures	0	0
Dividends and return of capital from subsidiaries	827,626	855,396
Contributions to subsidiaries	(1,538,708)	(1,013,916)
Due (from) to subsidiary	(85,151)	48,444
Net proceeds from RenaissanceRe UK	0
Net purchase of TMR		0
Net cash used in investing activities	(858,783)	66,005
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(50,785)	(44,547)
Dividends paid – preference shares	(23,634)	(27,567)
RenaissanceRe common share issuance, net of expenses	1,095,507
Issuance of debt, net of expenses		396,411
RenaissanceRe common share repurchases	(62,621)
Redemption of 6.08% Series C preference shares	(125,000)
Repayment of debt	0
Net third-party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(10,264)	(7,229)
Net cash provided by financing activities	823,203	317,068
Effect of exchange rate changes on foreign currency cash	(144)	0
Net decrease in cash and cash equivalents	(15,937)	1,565
Cash and cash equivalents, beginning of period	26,460	3,534
Cash and cash equivalents, end of period	10,523	5,099
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Cash flows provided by (used in) operating activities
Net cash provided by (used in) operating activities	1,357,985	1,676,883
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	11,317,724	12,515,140
Purchases of fixed maturity investments trading	(12,722,775)	(13,321,061)
Net sales of equity investments trading	1,842	(6,937)
Net purchases of short term investments	(887,896)	(1,311,685)
Net purchases of other investments	(101,302)	(130,476)
Net purchases of investments in other ventures	(2,407)	(2,341)
Net purchase of other assets		(4,108)
Return of investment from investment in other ventures	9,255	11,250
Dividends and return of capital from subsidiaries	(945,652)	(868,896)
Contributions to subsidiaries	1,668,708	1,013,916
Due (from) to subsidiary	29,336	(48,028)
Net proceeds from RenaissanceRe UK	136,744
Net purchase of TMR		(276,206)
Net cash used in investing activities	(1,496,423)	(2,429,432)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share issuance, net of expenses	0
Issuance of debt, net of expenses		0
RenaissanceRe common share repurchases	0
Redemption of 6.08% Series C preference shares	0
Repayment of debt	0
Net third-party redeemable noncontrolling interest share transactions	59,104	515,952
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	59,104	515,952
Effect of exchange rate changes on foreign currency cash	1,187	4,641
Net decrease in cash and cash equivalents	(78,147)	(231,956)
Cash and cash equivalents, beginning of period	1,343,877	1,094,784
Cash and cash equivalents, end of period	$ 1,265,730	$ 862,828

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- Definition

The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or the sale of investment in consolidated subsidiaries (generally greater than 50 percent).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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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
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-Name Accounting Standards Codification
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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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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-Paragraph 15
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