Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	$ (118,605)	$ 46,639
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	2,075,678	1,996,035
Purchases of fixed maturity investments trading	(1,490,123)	(1,768,996)
Proceeds from sales and maturities of fixed maturity investments available for sale	1,757	4,090
Net sales (purchases) of equity investments trading	50,627	(279)
Net sales of short term investments	112,795	67,313
Net (purchases) sales of other investments	(7,952)	2,116
Net (purchases) sales of investments in other ventures	(126)	915
Net purchases of other assets	(2,500)	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due to (from) subsidiary	0	0
Net purchase of Platinum	678,152	0
Net cash provided by investing activities	62,004	301,194
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(13,720)us-gaap_PaymentsOfDividendsCommonStock	(11,899)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid – preference shares	(5,595)	(5,595)
RenaissanceRe common share repurchases	(446)	(262,736)
Net (repayment) drawdown of debt	297,823us-gaap_ProceedsFromRepaymentsOfDebt	0us-gaap_ProceedsFromRepaymentsOfDebt
Net third party redeemable noncontrolling interest share transactions	(180,285)	(147,943)
Net cash provided by (used in) financing activities	97,777	(428,173)
Effect of exchange rate changes on foreign currency cash	(9,142)	(529)
Net increase (decrease) in cash and cash equivalents	32,034	(80,869)
Cash and cash equivalents, beginning of period	525,584	408,032
Cash and cash equivalents, end of period	557,618	327,163
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	(32,160)	(17,579)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	0	0
Purchases of fixed maturity investments trading	0	(74,733)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	0
Net sales (purchases) of equity investments trading	0	0
Net sales of short term investments	44,839	79,551
Net (purchases) sales of other investments	0	0
Net (purchases) sales of investments in other ventures	0	0
Net purchases of other assets	0
Dividends and return of capital from subsidiaries	641,434	142,423
Contributions to subsidiaries	(148,674)	(136,421)
Due to (from) subsidiary	3,306	8,630
Net purchase of Platinum	904,433
Net cash provided by investing activities	(66,180)	292,292
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	(13,720)	(11,899)
Dividends paid – preference shares	(5,595)	(5,595)
RenaissanceRe common share repurchases	(446)	(262,736)
Net (repayment) drawdown of debt	117,000
Net third party redeemable noncontrolling interest share transactions	0	0
Net cash provided by (used in) financing activities	97,239	(280,230)
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(1,101)	(5,517)
Cash and cash equivalents, beginning of period	5,986	8,796
Cash and cash equivalents, end of period	4,885	3,279
Platinum Underwriters Holdings, Ltd.
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	837
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	0
Purchases of fixed maturity investments trading	0
Proceeds from sales and maturities of fixed maturity investments available for sale	0
Net sales (purchases) of equity investments trading	0
Net sales of short term investments	0
Net (purchases) sales of other investments	0
Net (purchases) sales of investments in other ventures	0
Net purchases of other assets	0
Dividends and return of capital from subsidiaries	0
Contributions to subsidiaries	0
Due to (from) subsidiary	0
Net purchase of Platinum	(62,420)
Net cash provided by investing activities	62,420
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0
Dividends paid – preference shares	0
RenaissanceRe common share repurchases	0
Net (repayment) drawdown of debt	0
Net third party redeemable noncontrolling interest share transactions	0
Net cash provided by (used in) financing activities	0
Effect of exchange rate changes on foreign currency cash	0
Net increase (decrease) in cash and cash equivalents	63,257
Cash and cash equivalents, beginning of period	0
Cash and cash equivalents, end of period	63,257
RenRe North America Holdings Inc.
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	(13,573)	(8,334)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	5,007	5,353
Purchases of fixed maturity investments trading	0	0
Proceeds from sales and maturities of fixed maturity investments available for sale	0	0
Net sales (purchases) of equity investments trading	13,763	(370)
Net sales of short term investments	(5,848)	175
Net (purchases) sales of other investments	0	0
Net (purchases) sales of investments in other ventures	0	0
Net purchases of other assets	0
Dividends and return of capital from subsidiaries	0	2,701
Contributions to subsidiaries	1,753	1,950
Due to (from) subsidiary	1,700	(971)
Net purchase of Platinum	0
Net cash provided by investing activities	12,869	4,938
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Net (repayment) drawdown of debt	0
Net third party redeemable noncontrolling interest share transactions	0	0
Net cash provided by (used in) financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(704)	(3,396)
Cash and cash equivalents, beginning of period	1,033	4,027
Cash and cash equivalents, end of period	329	631
Platinum Underwriters Finance, Inc.
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	(295)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	45,029
Purchases of fixed maturity investments trading	0
Proceeds from sales and maturities of fixed maturity investments available for sale	0
Net sales (purchases) of equity investments trading	0
Net sales of short term investments	(45,042)
Net (purchases) sales of other investments	0
Net (purchases) sales of investments in other ventures	0
Net purchases of other assets	0
Dividends and return of capital from subsidiaries	0
Contributions to subsidiaries	0
Due to (from) subsidiary	0
Net purchase of Platinum	(1,537)
Net cash provided by investing activities	1,524
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0
Dividends paid – preference shares	0
RenaissanceRe common share repurchases	0
Net (repayment) drawdown of debt	0
Net third party redeemable noncontrolling interest share transactions	0
Net cash provided by (used in) financing activities	0
Effect of exchange rate changes on foreign currency cash	0
Net increase (decrease) in cash and cash equivalents	1,229
Cash and cash equivalents, beginning of period	0
Cash and cash equivalents, end of period	1,229
RenaissanceRe Finance, Inc.
Cash flows (used in) provided by operating activities:
Net cash (used in) provided by operating activities	(118,949)
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	0
Purchases of fixed maturity investments trading	0
Proceeds from sales and maturities of fixed maturity investments available for sale	0
Net sales (purchases) of equity investments trading	0
Net sales of short term investments	0
Net (purchases) sales of other investments	0
Net (purchases) sales of investments in other ventures	0
Net purchases of other assets	0
Dividends and return of capital from subsidiaries	0
Contributions to subsidiaries	180,000
Due to (from) subsidiary	0
Net purchase of Platinum	0
Net cash provided by investing activities	(180,000)
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0
Dividends paid – preference shares	0
RenaissanceRe common share repurchases	0
Net (repayment) drawdown of debt	299,400
Net third party redeemable noncontrolling interest share transactions	0
Net cash provided by (used in) financing activities	299,400
Effect of exchange rate changes on foreign currency cash	0
Net increase (decrease) in cash and cash equivalents	451
Cash and cash equivalents, beginning of period	0
Cash and cash equivalents, end of period	451
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	45,535	72,552
Cash flows provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	2,025,642	1,990,682
Purchases of fixed maturity investments trading	(1,490,123)	(1,694,263)
Proceeds from sales and maturities of fixed maturity investments available for sale	1,757	4,090
Net sales (purchases) of equity investments trading	36,864	91
Net sales of short term investments	118,846	(12,413)
Net (purchases) sales of other investments	(7,952)	2,116
Net (purchases) sales of investments in other ventures	(126)	915
Net purchases of other assets	(2,500)
Dividends and return of capital from subsidiaries	(641,434)	(145,124)
Contributions to subsidiaries	(33,079)	134,471
Due to (from) subsidiary	(5,006)	(7,659)
Net purchase of Platinum	(162,324)
Net cash provided by investing activities	231,371	3,964
Cash flows provided by (used in) financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Net (repayment) drawdown of debt	(118,577)
Net third party redeemable noncontrolling interest share transactions	(180,285)	(147,943)
Net cash provided by (used in) financing activities	(298,862)	(147,943)
Effect of exchange rate changes on foreign currency cash	(9,142)	(529)
Net increase (decrease) in cash and cash equivalents	(31,098)	(71,956)
Cash and cash equivalents, beginning of period	518,565	395,209
Cash and cash equivalents, end of period	$ 487,467	$ 323,253

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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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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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 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 noncontrolling interest during the period.

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

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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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-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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- 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.

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