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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	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$ 377,149	$ (37,349)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	4,600,808	2,318,859
Purchases of fixed maturity investments trading	(3,519,277)	(2,312,461)
Net purchases of equity investments trading	(4,601)	137
Net purchases of short term investments	(1,374,632)	(594,641)
Net purchases of other investments	(51,811)	(98,639)
Net purchases of investments in other ventures	(1,573)	(17,974)
Return of investment from investment in other ventures	11,250	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net purchase of the TMR Group Entities	(276,206)	0
Net cash used in investing activities	(616,042)	(704,719)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(14,469)	(13,224)
Dividends paid – preference shares	(9,189)	(5,595)
Drawdown of RenaissanceRe Revolving Credit Facility	200,000	0
Net third party redeemable noncontrolling interest share transactions	(16,847)	52,759
Taxes paid on withholding shares	(6,957)	(7,034)
Net cash provided by financing activities	152,538	26,906
Effect of exchange rate changes on foreign currency cash	(292)	1,543
Net decrease in cash and cash equivalents	(86,647)	(713,619)
Cash and cash equivalents, beginning of period	1,107,922	1,361,592
Cash and cash equivalents, end of period	1,021,275	647,973
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	2,198	659
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	15,655	42,793
Purchases of fixed maturity investments trading	(9,899)	(22,956)
Net purchases of equity investments trading	(2,046)	(21)
Net purchases of short term investments	(5,386)	(4,024)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	(16,500)
Due (from) to subsidiary	(185)	7
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	(1,861)	(701)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Drawdown of RenaissanceRe Revolving Credit Facility	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	337	(42)
Cash and cash equivalents, beginning of period	3,350	139
Cash and cash equivalents, end of period	3,687	97
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(21,202)	(23,449)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	29,861	27,672
Purchases of fixed maturity investments trading	(14,098)	(12,698)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	(4,946)	(5,925)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	6,629	14,106
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	17,446	23,155
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Drawdown of RenaissanceRe Revolving Credit Facility	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	(3,756)	(294)
Cash and cash equivalents, beginning of period	9,604	1,469
Cash and cash equivalents, end of period	5,848	1,175
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(317,296)	(6,875)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	277,030	119,542
Purchases of fixed maturity investments trading	(35,909)	(20,216)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	(54,622)	54,728
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0
Dividends and return of capital from subsidiaries	487,264	177,250
Contributions to subsidiaries	(528,416)	(150,205)
Due (from) to subsidiary	2,100	(154,877)
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	147,447	26,222
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(14,469)	(13,224)
Dividends paid – preference shares	(9,189)	(5,595)
Drawdown of RenaissanceRe Revolving Credit Facility	200,000
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(6,957)	(7,034)
Net cash provided by financing activities	169,385	(25,853)
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	(464)	(6,506)
Cash and cash equivalents, beginning of period	3,534	14,656
Cash and cash equivalents, end of period	3,070	8,150
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	713,449	(7,684)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	4,278,262	2,128,852
Purchases of fixed maturity investments trading	(3,459,371)	(2,256,591)
Net purchases of equity investments trading	(2,555)	158
Net purchases of short term investments	(1,309,678)	(639,420)
Net purchases of other investments	(51,811)	(98,639)
Net purchases of investments in other ventures	(1,573)	(17,974)
Return of investment from investment in other ventures	11,250
Dividends and return of capital from subsidiaries	(487,264)	(177,250)
Contributions to subsidiaries	528,416	166,705
Due (from) to subsidiary	(8,544)	140,764
Net purchase of the TMR Group Entities	(276,206)
Net cash used in investing activities	(779,074)	(753,395)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Drawdown of RenaissanceRe Revolving Credit Facility	0
Net third party redeemable noncontrolling interest share transactions	(16,847)	52,759
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	(16,847)	52,759
Effect of exchange rate changes on foreign currency cash	(292)	1,543
Net decrease in cash and cash equivalents	(82,764)	(706,777)
Cash and cash equivalents, beginning of period	1,091,434	1,345,328
Cash and cash equivalents, end of period	$ 1,008,670	$ 638,551

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