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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, 2019	Jun. 30, 2018
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$ 783,969	$ 349,111
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	9,405,348	4,813,208
Purchases of fixed maturity investments trading	(9,230,000)	(5,014,011)
Net (purchases) sales of equity investments trading	125,597	(34,298)
Net purchases of short term investments	(1,972,717)	(1,062,422)
Net purchases of other investments	(133,889)	(111,921)
Net purchases of investments in other ventures	(2,249)	(20,952)
Return of investment from investment in other ventures	11,250	8,464
Net purchase of other assets	(4,108)	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	(2,076,974)	(1,421,932)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(29,439)	(26,468)
Dividends paid – preference shares	(18,378)	(11,191)
Issuance of debt, net of expenses	396,411	0
Issuance of preference shares, net of expenses	0	242,371
Net third party redeemable noncontrolling interest share transactions	514,732	64,534
Taxes paid on withholding shares	(7,083)	(7,044)
Net cash provided by financing activities	856,243	262,202
Effect of exchange rate changes on foreign currency cash	(534)	(2,501)
Net decrease in cash and cash equivalents	(437,296)	(813,120)
Cash and cash equivalents, beginning of period	1,107,922	1,361,592
Cash and cash equivalents, end of period	670,626	548,472
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	2,691	1,213
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	15,655	62,334
Purchases of fixed maturity investments trading	(15,726)	(46,047)
Net (purchases) sales of equity investments trading	(2,450)	(675)
Net purchases of short term investments	305	(154)
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	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	(16,848)
Due (from) to subsidiary	(149)	50
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	(2,365)	(1,340)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, 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 financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	326	(127)
Cash and cash equivalents, beginning of period	3,350	139
Cash and cash equivalents, end of period	3,676	12
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(33,592)	(32,605)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	43,746	35,946
Purchases of fixed maturity investments trading	(14,098)	(16,397)
Net (purchases) sales of equity investments trading	0	0
Net purchases of short term investments	(8,544)	(5,001)
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	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	7,340	21,333
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	28,444	35,881
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, 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 financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	(5,148)	3,276
Cash and cash equivalents, beginning of period	9,604	1,469
Cash and cash equivalents, end of period	4,456	4,745
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(359,699)	(7,183)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	277,030	120,555
Purchases of fixed maturity investments trading	(36,905)	(246,764)
Net (purchases) sales of equity investments trading	0	0
Net purchases of short term investments	4,212	56,048
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	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	587,264	278,864
Contributions to subsidiaries	(850,807)	(250,238)
Due (from) to subsidiary	39,056	(161,104)
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	19,850	(202,639)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(29,439)	(26,468)
Dividends paid – preference shares	(18,378)	(11,191)
Issuance of debt, net of expenses	396,411
Issuance of preference shares, net of expenses		242,371
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(7,083)	(7,044)
Net cash provided by financing activities	341,511	197,668
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	1,662	(12,154)
Cash and cash equivalents, beginning of period	3,534	14,656
Cash and cash equivalents, end of period	5,196	2,502
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	1,174,569	387,686
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	9,068,917	4,594,373
Purchases of fixed maturity investments trading	(9,163,271)	(4,704,803)
Net (purchases) sales of equity investments trading	128,047	(33,623)
Net purchases of short term investments	(1,968,690)	(1,113,315)
Net purchases of other investments	(133,889)	(111,921)
Net purchases of investments in other ventures	(2,249)	(20,952)
Return of investment from investment in other ventures	11,250	8,464
Net purchase of other assets	(4,108)
Dividends and return of capital from subsidiaries	(587,264)	(278,864)
Contributions to subsidiaries	850,807	267,086
Due (from) to subsidiary	(46,247)	139,721
Net purchase of the TMR Group Entities	(276,206)
Net cash used in investing activities	(2,122,903)	(1,253,834)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	514,732	64,534
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	514,732	64,534
Effect of exchange rate changes on foreign currency cash	(534)	(2,501)
Net decrease in cash and cash equivalents	(434,136)	(804,115)
Cash and cash equivalents, beginning of period	1,091,434	1,345,328
Cash and cash equivalents, end of period	$ 657,298	$ 541,213

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Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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X

- 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=118932676&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=118932676&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=118932676&loc=d3e3213-108585

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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.

+ Details

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