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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	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	$ 856,965	$ 783,969
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	8,340,351	9,405,348
Purchases of fixed maturity investments trading	(8,949,454)	(9,230,000)
Net purchases of equity investments trading	(45,008)	125,597
Net purchases of short term investments	(990,604)	(1,972,717)
Net purchases of other investments	(90,010)	(133,889)
Net purchases of investments in other ventures	(1,994)	(2,249)
Net purchase of other assets	0	(4,108)
Return of investment from investment in other ventures	9,157	11,250
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net purchase of TMR	0	(276,206)
Net cash used in investing activities	(1,727,562)	(2,076,974)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(33,063)	(29,439)
Dividends paid – preference shares	(16,345)	(18,378)
RenaissanceRe common share issuance, net of expenses	1,095,549	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	79,283	514,732
Taxes paid on withholding shares	(10,243)	(7,083)
Net cash provided by financing activities	677,560	856,243
Effect of exchange rate changes on foreign currency cash	(187)	(534)
Net decrease in cash and cash equivalents	(193,224)	(437,296)
Cash and cash equivalents, beginning of period	1,379,068	1,107,922
Cash and cash equivalents, end of period	$ 1,185,844	670,626
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 (used in) provided by operating activities
Net cash provided by (used in) operating activities	$ (41,978)	(33,592)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	30,793	43,746
Purchases of fixed maturity investments trading	(30,725)	(14,098)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	161,823	(8,544)
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	101,061	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	28,669	7,340
Net purchase of TMR		0
Net cash used in investing activities	291,621	28,444
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	(357)	(5,148)
Cash and cash equivalents, beginning of period	8,731	9,604
Cash and cash equivalents, end of period	8,374	4,456
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	8,180	(359,699)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	52,093	277,030
Purchases of fixed maturity investments trading	(220,197)	(36,905)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	47,098	4,212
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	499,704	587,264
Contributions to subsidiaries	(1,139,323)	(850,807)
Due (from) to subsidiary	(116,826)	39,056
Net purchase of TMR		0
Net cash used in investing activities	(877,451)	19,850
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(33,063)	(29,439)
Dividends paid – preference shares	(16,345)	(18,378)
RenaissanceRe common share issuance, net of expenses	1,095,549
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	(10,243)	(7,083)
Net cash provided by financing activities	848,277	341,511
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	(20,994)	1,662
Cash and cash equivalents, beginning of period	26,460	3,534
Cash and cash equivalents, end of period	5,466	5,196
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by operating activities
Net cash provided by (used in) operating activities	890,763	1,177,260
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	8,257,465	9,084,572
Purchases of fixed maturity investments trading	(8,698,532)	(9,178,997)
Net purchases of equity investments trading	(45,008)	125,597
Net purchases of short term investments	(1,199,525)	(1,968,385)
Net purchases of other investments	(90,010)	(133,889)
Net purchases of investments in other ventures	(1,994)	(2,249)
Net purchase of other assets		(4,108)
Return of investment from investment in other ventures	9,157	11,250
Dividends and return of capital from subsidiaries	(600,765)	(587,264)
Contributions to subsidiaries	1,139,323	850,807
Due (from) to subsidiary	88,157	(46,396)
Net purchase of TMR		(276,206)
Net cash used in investing activities	(1,141,732)	(2,125,268)
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	79,283	514,732
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	79,283	514,732
Effect of exchange rate changes on foreign currency cash	(187)	(534)
Net decrease in cash and cash equivalents	(171,873)	(433,810)
Cash and cash equivalents, beginning of period	1,343,877	1,094,784
Cash and cash equivalents, end of period	$ 1,172,004	$ 660,974

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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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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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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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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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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