Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities	$ 660,657,000	$ 795,721,000	$ 716,929,000
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	7,682,573,000	8,251,405,000	8,192,867,000
Purchases of fixed maturity investments trading	(7,639,178,000)	(8,466,467,000)	(8,536,238,000)
Proceeds from sales and maturities of fixed maturity investments available for sale	7,088,000	45,178,000	65,168,000
Net (purchases) sales of equity investments trading	(20,003,000)	(33,055,000)	0
Net (purchases) sales of short term investments	45,023,000	(246,971,000)	68,777,000
Net sales of other investments	59,120,000	76,214,000	150,828,000
Net purchases of investments in other ventures	1,030,000	(4,000,000)	0
Net sales (purchases) of other assets	6,000,000	2,181,000	(4,079,000)
Dividends and return of capital from subsidiaries	0	0	0
Contributions to subsidiaries	0	0	0
Due (from) to subsidiary	0	0	0
Net proceeds (payments) related to sale of discontinued operations	0	60,000,000	(9,000,000)
Net cash provided by (used in) investing activities	141,653,000	(315,515,000)	(71,677,000)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(45,912,000)us-gaap_PaymentsOfDividendsCommonStock	(49,267,000)us-gaap_PaymentsOfDividendsCommonStock	(53,356,000)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid – preference shares	(22,381,000)	(24,948,000)	(34,895,000)
RenaissanceRe common share repurchases	(514,678,000)	(207,410,000)	(463,309,000)
Net repayment of debt	0us-gaap_ProceedsFromRepaymentsOfDebt	(102,436,000)us-gaap_ProceedsFromRepaymentsOfDebt	(1,937,000)us-gaap_ProceedsFromRepaymentsOfDebt
Redemption of preference shares		(125,000,000)	(150,000,000)
Contribution of capital from parent		0
Net third party redeemable noncontrolling interest share transactions	(111,707,000)	(5,750,000)	164,927,000
Net cash used in financing activities	(694,678,000)	(398,955,000)	(538,570,000)
Effect of exchange rate changes on foreign currency cash	9,920,000	1,423,000	1,692,000
Net increase in cash and cash equivalents	117,552,000	82,674,000	108,374,000
Net decrease in cash and cash equivalents of discontinued operations	0	21,213,000	13,946,000
Cash and cash equivalents, beginning of period	408,032,000	304,145,000	181,825,000
Cash and cash equivalents, end of period	525,584,000	408,032,000	304,145,000
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities	429,000	(37,966,000)	128,567,000
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	88,273,000	880,749,000	744,211,000
Purchases of fixed maturity investments trading	(88,341,000)	(491,768,000)	(692,783,000)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	0	0
Net (purchases) sales of equity investments trading	0	0
Net (purchases) sales of short term investments	73,717,000	21,217,000	(80,485,000)
Net sales of other investments	0	0	0
Net purchases of investments in other ventures	0	0
Net sales (purchases) of other assets	0	0	0
Dividends and return of capital from subsidiaries	1,259,224,000	504,241,000	979,311,000
Contributions to subsidiaries	(759,456,000)	(500,652,000)	(366,210,000)
Due (from) to subsidiary	6,315,000	17,446,000	(15,359,000)
Net proceeds (payments) related to sale of discontinued operations		0	0
Net cash provided by (used in) investing activities	579,732,000	431,233,000	568,685,000
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(45,912,000)	(49,267,000)	(53,356,000)
Dividends paid – preference shares	(22,381,000)	(24,948,000)	(34,895,000)
RenaissanceRe common share repurchases	(514,678,000)	(207,410,000)	(463,309,000)
Net repayment of debt	0	(100,000,000)	0
Redemption of preference shares		(125,000,000)	(150,000,000)
Contribution of capital from parent		0
Net third party redeemable noncontrolling interest share transactions	0	0	0
Net cash used in financing activities	(582,971,000)	(390,769,000)	(701,560,000)
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase in cash and cash equivalents	(2,810,000)	2,498,000	(4,308,000)
Net decrease in cash and cash equivalents of discontinued operations		0	0
Cash and cash equivalents, beginning of period	8,796,000	6,298,000	10,606,000
Cash and cash equivalents, end of period	5,986,000	8,796,000	6,298,000
RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows provided by (used in) operating activities:
Net cash provided by (used in) operating activities	(18,114,000)	(7,583,000)	(10,376,000)
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	20,487,000	185,143,000	140,626,000
Purchases of fixed maturity investments trading	(14,969,000)	(160,422,000)	(73,800,000)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	0	0
Net (purchases) sales of equity investments trading	13,761,000	(81,437,000)
Net (purchases) sales of short term investments	225,000	9,399,000	(10,624,000)
Net sales of other investments	0	0	0
Net purchases of investments in other ventures	0	0
Net sales (purchases) of other assets	0	0	0
Dividends and return of capital from subsidiaries	11,204,000	83,593,000	9,541,000
Contributions to subsidiaries	(12,625,000)	(38,117,000)	(50,000,000)
Due (from) to subsidiary	(2,963,000)	(3,761,000)	241,000
Net proceeds (payments) related to sale of discontinued operations		0	(9,000,000)
Net cash provided by (used in) investing activities	15,120,000	(5,602,000)	6,984,000
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0	0
Dividends paid – preference shares	0	0	0
RenaissanceRe common share repurchases	0	0	0
Net repayment of debt		0	0
Redemption of preference shares		0	0
Contribution of capital from parent		15,684,000
Net third party redeemable noncontrolling interest share transactions	0	0	0
Net cash used in financing activities	0	15,684,000	0
Effect of exchange rate changes on foreign currency cash	0	0	0
Net increase in cash and cash equivalents	(2,994,000)	2,499,000	(3,392,000)
Net decrease in cash and cash equivalents of discontinued operations		0	0
Cash and cash equivalents, beginning of period	4,027,000	1,528,000	4,920,000
Cash and cash equivalents, end of period	1,033,000	4,027,000	1,528,000
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	678,342,000	841,270,000	598,738,000
Cash flows provided by (used in) investing activities
Proceeds from sales and maturities of fixed maturity investments trading	7,573,813,000	7,185,513,000	7,308,030,000
Purchases of fixed maturity investments trading	(7,535,868,000)	(7,814,277,000)	(7,769,655,000)
Proceeds from sales and maturities of fixed maturity investments available for sale	7,088,000	45,178,000	65,168,000
Net (purchases) sales of equity investments trading	(33,764,000)	48,382,000
Net (purchases) sales of short term investments	(28,919,000)	(277,587,000)	159,886,000
Net sales of other investments	59,120,000	76,214,000	150,828,000
Net purchases of investments in other ventures	1,030,000	(4,000,000)
Net sales (purchases) of other assets	6,000,000	2,181,000	(4,079,000)
Dividends and return of capital from subsidiaries	(1,270,428,000)	(587,834,000)	(988,852,000)
Contributions to subsidiaries	772,081,000	538,769,000	416,210,000
Due (from) to subsidiary	(3,352,000)	(13,685,000)	15,118,000
Net proceeds (payments) related to sale of discontinued operations		60,000,000	0
Net cash provided by (used in) investing activities	(453,199,000)	(741,146,000)	(647,346,000)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0	0
Dividends paid – preference shares	0	0	0
RenaissanceRe common share repurchases	0	0	0
Net repayment of debt		(2,436,000)	(1,937,000)
Redemption of preference shares		0	0
Contribution of capital from parent		(15,684,000)
Net third party redeemable noncontrolling interest share transactions	(111,707,000)	(5,750,000)	164,927,000
Net cash used in financing activities	(111,707,000)	(23,870,000)	162,990,000
Effect of exchange rate changes on foreign currency cash	9,920,000	1,423,000	1,692,000
Net increase in cash and cash equivalents	123,356,000	77,677,000	116,074,000
Net decrease in cash and cash equivalents of discontinued operations		21,213,000	13,946,000
Cash and cash equivalents, beginning of period	395,209,000	296,319,000	166,299,000
Cash and cash equivalents, end of period	518,565,000	395,209,000	296,319,000
Series C Preferred Stock
Cash flows provided by (used in) financing activities
Redemption of preference shares	0	(125,000,000)	0
Series C Preferred Stock \| RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) financing activities
Redemption of preference shares	0	(125,000,000)	0
Series D Preferred Stock
Cash flows provided by (used in) financing activities
Redemption of preference shares	0	(150,000,000)	(150,000,000)
Series D Preferred Stock \| RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) financing activities
Redemption of preference shares	0	(150,000,000)	(150,000,000)
Series D Preferred Stock \| RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows provided by (used in) financing activities
Redemption of preference shares		0
Series D Preferred Stock \| Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows provided by (used in) financing activities
Redemption of preference shares		0
Series E Preferred Stock
Cash flows provided by (used in) financing activities
Issuance of 5.375% Series E preference shares, net of expenses	0	265,856,000	0
Series E Preferred Stock \| RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows provided by (used in) financing activities
Issuance of 5.375% Series E preference shares, net of expenses	0	265,856,000	0
Series E Preferred Stock \| RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows provided by (used in) financing activities
Issuance of 5.375% Series E preference shares, net of expenses		0
Series E Preferred Stock \| Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows provided by (used in) financing activities
Issuance of 5.375% Series E preference shares, net of expenses		$ 0

The net cash inflow (outflow) associated with the acquisition or disposal of other investments during the period.

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The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is one year or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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The increase (decrease) during the reporting period in the aggregate amount of obligations to be paid to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management; an entity and its principal owners, management, or member of their immediate families; affiliates; or other parties with the ability to exert significant influence.

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Increase (decrease) in cash associated with the entity's discontinued operations.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow to reacquire common stock during the period.

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The cash outflow to reacquire preferred stock during the period.

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The cash outflow during the period for redemption of redeemable noncontrolling interests.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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

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- Definition

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).

+ References

No definition available.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

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- Definition

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).

+ References

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- Definition

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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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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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