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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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows (used in) provided by operating activities
Net cash provided by operating activities	$ 2,137,195	$ 1,221,701	$ 1,025,787
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	17,313,940	11,585,576	9,490,669
Purchases of fixed maturity investments trading	(17,919,343)	(12,489,972)	(10,093,532)
Net (purchases) sales of equity investments trading	(7,841)	14,156	115,837
Net sales (purchases) of short term investments	(1,900,741)	(1,436,389)	364,011
Net purchases of other investments	(202,878)	(199,475)	(19,419)
Net purchases of investments in other ventures	(2,717)	(21,473)	0
Return of investment from investment in other ventures	11,250	8,464	20,000
Net (purchases) sales of other assets	(4,108)	2,500	0
Dividends and return of capital from subsidiaries	0	0	0
Contributions to subsidiaries	0	0	0
Due to (from) subsidiaries	0	0	0
Net purchase of TMR	(276,206)	0	0
Net cash used in investing activities	(2,988,644)	(2,536,613)	(122,434)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(59,368)	(52,841)	(51,370)
Dividends paid – preference shares	(36,756)	(30,088)	(22,381)
RenaissanceRe common share repurchases	0	0	(188,591)
RenaissanceRe common share issuance	0	250,000	0
Issuance of preference shares, net of expenses	0	241,448	0
Issuance of debt, net of expenses	396,411	0	295,866
Repayment of debt	0	0	(250,000)
Net third-party redeemable noncontrolling interest share transactions	827,083	665,683	260,475
Taxes paid on withholding shares	(7,253)	(7,862)	(15,139)
Net cash provided by financing activities	1,120,117	1,066,340	28,860
Effect of exchange rate changes on foreign currency cash	2,478	(5,098)	8,222
Net increase (decrease) in cash and cash equivalents	271,146	(253,670)	940,435
Cash and cash equivalents, beginning of year	1,107,922	1,361,592	421,157
Cash and cash equivalents, end of year	1,379,068	1,107,922	1,361,592
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash provided by operating activities	(2,861)	17,187	21,118
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	306,579	384,818	261,601
Purchases of fixed maturity investments trading	(66,740)	(520,935)	(344,463)
Net sales (purchases) of short term investments	(116,499)	48,600	243,571
Dividends and return of capital from subsidiaries	1,400,944	672,098	478,496
Net cash used in investing activities	(267,247)	(428,966)	263,952
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(59,368)	(52,841)	(51,370)
Dividends paid – preference shares	(36,756)	(30,088)	(22,381)
RenaissanceRe common share repurchases	0	0	(188,591)
RenaissanceRe common share issuance	0	250,000	0
Issuance of preference shares, net of expenses	0	241,448	0
Issuance of debt, net of expenses	396,411	0	0
Repayment of debt			0
Taxes paid on withholding shares	(7,253)	(7,862)	(15,139)
Net cash provided by financing activities	293,034	400,657	(277,481)
Cash and cash equivalents, beginning of year	3,534	14,656	7,067
Cash and cash equivalents, end of year	26,460	3,534	14,656
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows provided by financing activities
Repayment of debt			0
RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows provided by financing activities
Repayment of debt			0
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash provided by operating activities	(2,861)	17,187	21,118
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	306,579	384,818	261,601
Purchases of fixed maturity investments trading	(66,740)	(520,935)	(344,463)
Net (purchases) sales of equity investments trading	0	0	0
Net sales (purchases) of short term investments	(116,499)	48,600	243,571
Net purchases of other investments	0	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0	0
Net (purchases) sales of other assets	0	0
Dividends and return of capital from subsidiaries	1,400,944	672,098	478,496
Contributions to subsidiaries	(1,165,607)	(785,785)	(669,672)
Due to (from) subsidiaries	(625,924)	(227,762)	294,419
Net purchase of TMR	0
Net cash used in investing activities	(267,247)	(428,966)	263,952
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(59,368)	(52,841)	(51,370)
Dividends paid – preference shares	(36,756)	(30,088)	(22,381)
RenaissanceRe common share repurchases			(188,591)
RenaissanceRe common share issuance		250,000
Issuance of preference shares, net of expenses		241,448
Issuance of debt, net of expenses	396,411		0
Net third-party redeemable noncontrolling interest share transactions	0	0	0
Taxes paid on withholding shares	(7,253)	(7,862)	(15,139)
Net cash provided by financing activities	293,034	400,657	(277,481)
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase (decrease) in cash and cash equivalents	22,926	(11,122)	7,589
Cash and cash equivalents, beginning of year	3,534	14,656	7,067
Cash and cash equivalents, end of year	26,460	3,534	14,656
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 operating activities	1,769,250	1,135,554	1,363,084
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	16,868,826	11,046,968	8,550,179
Purchases of fixed maturity investments trading	(17,741,881)	(11,840,813)	(9,229,732)
Net (purchases) sales of equity investments trading	(4,483)	15,464	32,265
Net sales (purchases) of short term investments	(1,501,264)	(1,485,040)	79,520
Net purchases of other investments	(202,878)	(199,475)	(19,419)
Net purchases of investments in other ventures	(2,717)	(21,473)
Return of investment from investment in other ventures	11,250	8,464	20,000
Net (purchases) sales of other assets	(4,108)	2,500
Dividends and return of capital from subsidiaries	(1,418,794)	(672,098)	(529,537)
Contributions to subsidiaries	1,290,607	867,632	706,211
Due to (from) subsidiaries	625,840	227,838	(293,800)
Net purchase of TMR	(276,206)
Net cash used in investing activities	(2,355,808)	(2,050,033)	(684,313)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0	0
Dividends paid – preference shares	0	0	0
RenaissanceRe common share repurchases			0
RenaissanceRe common share issuance		0
Issuance of preference shares, net of expenses		0
Issuance of debt, net of expenses	0		0
Net third-party redeemable noncontrolling interest share transactions	827,083	665,683	260,475
Taxes paid on withholding shares	0	0	0
Net cash provided by financing activities	827,083	665,683	260,475
Effect of exchange rate changes on foreign currency cash	2,478	(5,098)	8,222
Net increase (decrease) in cash and cash equivalents	243,003	(253,894)	947,468
Cash and cash equivalents, beginning of year	1,091,434	1,345,328	397,860
Cash and cash equivalents, end of year	1,334,437	1,091,434	1,345,328
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by operating activities	3,872	6,315	(8,253)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	77,798	97,272	100,248
Purchases of fixed maturity investments trading	(77,145)	(72,292)	(99,568)
Net (purchases) sales of equity investments trading	(3,358)	(1,308)	(1,752)
Net sales (purchases) of short term investments	739	(404)	114
Net purchases of other investments	0	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0	0
Net (purchases) sales of other assets	0	0
Dividends and return of capital from subsidiaries	4,350	0	9,175
Contributions to subsidiaries		(16,847)	0
Contributions to subsidiaries	0
Due to (from) subsidiaries	(166)	(9,525)	13
Net purchase of TMR	0
Net cash used in investing activities	2,218	(3,104)	8,230
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0	0
Dividends paid – preference shares	0	0	0
RenaissanceRe common share repurchases			0
RenaissanceRe common share issuance		0
Issuance of preference shares, net of expenses		0
Issuance of debt, net of expenses	0		0
Net third-party redeemable noncontrolling interest share transactions	0	0	0
Taxes paid on withholding shares	0	0	0
Net cash provided by financing activities	0	0	0
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase (decrease) in cash and cash equivalents	6,090	3,211	(23)
Cash and cash equivalents, beginning of year	3,350	139	162
Cash and cash equivalents, end of year	9,440	3,350	139
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by operating activities			(2,272)
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 sales (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 to (from) subsidiaries			(123)
Net cash used in investing activities			245,601
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares			0
Dividends paid – preference shares			0
RenaissanceRe common share repurchases			0
Issuance of debt, net of expenses			0
Repayment of debt			(250,000)
Net third-party redeemable noncontrolling interest share transactions			0
Taxes paid on withholding shares			0
Net cash provided by financing activities			(250,000)
Effect of exchange rate changes on foreign currency cash			0
Net increase (decrease) in cash and cash equivalents			(6,671)
Cash and cash equivalents, beginning of year		0	6,671
Cash and cash equivalents, end of year			0
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash provided by operating activities	366,934	62,645	(347,890)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	60,737	56,518	288,900
Purchases of fixed maturity investments trading	(33,577)	(55,932)	(275,778)
Net (purchases) sales of equity investments trading	0	0	0
Net sales (purchases) of short term investments	(283,717)	455	(493)
Net purchases of other investments	0	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0	0
Net (purchases) sales of other assets	0	0
Dividends and return of capital from subsidiaries	13,500	0	41,866
Contributions to subsidiaries	(125,000)	(65,000)	(9,890)
Due to (from) subsidiaries	250	9,449	(509)
Net purchase of TMR	0
Net cash used in investing activities	(367,807)	(54,510)	44,096
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0	0
Dividends paid – preference shares	0	0	0
RenaissanceRe common share repurchases			0
RenaissanceRe common share issuance		0
Issuance of preference shares, net of expenses		0
Issuance of debt, net of expenses	0		295,866
Repayment of debt			0
Net third-party redeemable noncontrolling interest share transactions	0	0	0
Taxes paid on withholding shares	0	0	0
Net cash provided by financing activities	0	0	295,866
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase (decrease) in cash and cash equivalents	(873)	8,135	(7,928)
Cash and cash equivalents, beginning of year	9,604	1,469	9,397
Cash and cash equivalents, end of year	$ 8,731	$ 9,604	$ 1,469

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for 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).

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The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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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.

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

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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.

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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.

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

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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.

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