RenaissanceRe (RNR) 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	RENAISSANCERE HOLDINGS LTD.
Trading Symbol	RNR
Entity Central Index Key	913,144
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		40,029,116

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Fixed maturity investments trading, at fair value – amortized cost $7,061,487 at September 30, 2017 (December 31, 2016 – $6,920,690)	$ 7,092,969	$ 6,891,244
Short term investments, at fair value	1,497,262	1,368,379
Equity investments trading, at fair value	402,035	383,313
Other investments, at fair value	548,492	549,805
Investments in other ventures, under equity method	101,420	124,227
Total investments	9,642,178	9,316,968
Cash and cash equivalents	581,576	421,157
Premiums receivable	1,521,266	987,323
Prepaid reinsurance premiums	635,756	441,260
Reinsurance recoverable	1,588,304	279,564
Accrued investment income	38,366	38,076
Deferred acquisition costs	434,914	335,325
Receivable for investments sold	193,758	105,841
Other assets	164,019	175,382
Goodwill and other intangible assets	244,787	251,186
Total assets	15,044,924	12,352,082
Liabilities
Reserve for claims and claim expenses	5,192,313	2,848,294
Unearned premiums	1,713,069	1,231,573
Debt	989,245	948,663
Reinsurance balances payable	1,034,454	673,983
Payable for investments purchased	377,543	305,714
Other liabilities	301,559	301,684
Total liabilities	9,608,183	6,309,911
Commitments and Contingencies
Redeemable noncontrolling interests	1,033,729	1,175,594
Shareholders’ Equity
Preference shares: $1.00 par value – 16,000,000 shares issued and outstanding at September 30, 2017 (December 31, 2016 – 16,000,000)	400,000	400,000
Common shares: $1.00 par value – 40,029,116 shares issued and outstanding at September 30, 2017 (December 31, 2016 – 41,187,413)	40,029	41,187
Additional paid-in capital	32,852	216,558
Accumulated other comprehensive income	161	1,133
Retained earnings	3,929,970	4,207,699
Total shareholders’ equity attributable to RenaissanceRe	4,403,012	4,866,577
Total liabilities, noncontrolling interests and shareholders’ equity	$ 15,044,924	$ 12,352,082

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 7,061,487	$ 6,920,690
Preference shares, Par value (In dollars per share)	$ 1	$ 1
Preference shares, Shares issued (In shares)	16,000,000	16,000,000
Preference shares, Shares outstanding (In shares)	16,000,000	16,000,000
Common shares, Par value (In dollars per share)	$ 1	$ 1
Common shares, Shares issued (In shares)	40,029,116	41,187,413
Common shares, Shares outstanding (In shares)	40,029,116	41,187,413

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Gross premiums written	$ 640,269	$ 430,224	$ 2,389,774	$ 2,051,485
Net premiums written	483,221	284,222	1,583,102	1,315,813
Decrease (increase) in unearned premiums	64,571	62,299	(287,000)	(264,284)
Net premiums earned	547,792	346,521	1,296,102	1,051,529
Net investment income	40,257	51,423	148,745	134,410
Net foreign exchange (losses) gains	(156)	(5,986)	11,118	(8,368)
Equity in earnings (losses) of other ventures	1,794	(11,630)	5,830	(3,997)
Other income	2,996	2,268	7,053	9,001
Net realized and unrealized gains on investments	42,052	59,870	143,538	191,295
Total revenues	634,735	442,466	1,612,386	1,373,870
Expenses
Net claims and claim expenses incurred	1,221,696	112,575	1,557,364	406,930
Acquisition expenses	76,761	80,580	248,294	215,177
Operational expenses	42,537	40,493	131,586	147,801
Corporate expenses	4,413	11,537	14,335	25,514
Interest expense	11,799	10,536	32,416	31,610
Total expenses	1,357,206	255,721	1,983,995	827,032
(Loss) income before taxes	(722,471)	186,745	(371,609)	546,838
Income tax benefit (expense)	18,977	1,316	14,739	(8,040)
Net (loss) income	(703,494)	188,061	(356,870)	538,798
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Net (loss) income attributable to RenaissanceRe	(499,217)	152,420	(224,532)	427,931
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders	$ (504,812)	$ 146,825	$ (241,318)	$ 411,145
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ (12.75)	$ 3.58	$ (6.04)	$ 9.77
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	(12.75)	3.56	(6.04)	9.71
Dividends per common share (in dollars per share)	$ 0.32	$ 0.31	$ 0.96	$ 0.93

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive (loss) income
Net (loss) income	$ (703,494)	$ 188,061	$ (356,870)	$ 538,798
Change in net unrealized gains on investments	300	284	(972)	513
Comprehensive (loss) income	(703,194)	188,345	(357,842)	539,311
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive (loss) income attributable to RenaissanceRe	$ (498,917)	$ 152,704	$ (225,504)	$ 428,444

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Preference Shares	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Retained Earnings
Beginning of period at Dec. 31, 2015		$ 400,000	$ 43,701	$ 507,674	$ 2,108	$ 3,778,701
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares			(2,741)	(306,693)
Exercise of options and issuance of restricted stock awards			196	13,112
Change in redeemable noncontrolling interests				(1,040)
Change in net unrealized gains on investments					513
Cumulative effect of adoption of ASU 2016-09 (Note 2)						0
Net (loss) income	$ 538,798					538,798
Net loss (income) attributable to redeemable noncontrolling interests	(110,867)					(110,867)
Dividends on common shares						(38,886)
Dividends on preference shares	(16,786)					(16,786)
End of period at Sep. 30, 2016	4,807,790	400,000	41,156	213,053	2,621	4,150,960
Beginning of period at Dec. 31, 2016	4,866,577	400,000	41,187	216,558	1,133	4,207,699
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares			(1,322)	(187,269)
Exercise of options and issuance of restricted stock awards			164	3,870
Change in redeemable noncontrolling interests				(307)
Change in net unrealized gains on investments					(972)
Cumulative effect of adoption of ASU 2016-09 (Note 2)						2,213
Net (loss) income	(356,870)					(356,870)
Net loss (income) attributable to redeemable noncontrolling interests	132,338					132,338
Dividends on common shares						(38,624)
Dividends on preference shares	(16,786)					(16,786)
End of period at Sep. 30, 2017	$ 4,403,012	$ 400,000	$ 40,029	$ 32,852	$ 161	$ 3,929,970

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows provided by operating activities
Net (loss) income	$ (356,870)	$ 538,798
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Amortization, accretion and depreciation	18,586	18,343
Equity in undistributed losses of other ventures	19,559	10,173
Net realized and unrealized gains on investments	(143,538)	(191,295)
Net unrealized (gains) losses included in net investment income	(2,686)	17,608
Change in:
Premiums receivable	(533,943)	(403,322)
Prepaid reinsurance premiums	(194,496)	(280,750)
Reinsurance recoverable	(1,308,740)	(106,243)
Deferred acquisition costs	(99,589)	(152,461)
Reserve for claims and claim expenses	2,344,019	94,054
Unearned premiums	481,496	545,034
Reinsurance balances payable	360,471	250,686
Other	37,433	39,740
Net cash provided by operating activities	621,702	380,365
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	7,663,002	6,509,019
Purchases of fixed maturity investments trading	(7,798,285)	(6,744,838)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	5,931
Net sales of equity investments trading	61,571	183,112
Net (purchases) sales of short term investments	(146,326)	128,869
Net sales (purchases) of other investments	5,181	(56,765)
Net sales of other assets	0	400
Net cash (used in) provided by investing activities	(214,857)	25,728
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(38,624)	(38,886)
Dividends paid – preference shares	(16,786)	(16,786)
RenaissanceRe common share repurchases	(188,591)	(309,434)
Issuance of debt, net of expenses	295,866	0
Repayment of debt	(250,000)	0
Net third party redeemable noncontrolling interest share transactions	(44,193)	(45,496)
Taxes paid on withholding shares	(13,694)	(10,362)
Net cash used in financing activities	(256,022)	(420,964)
Effect of exchange rate changes on foreign currency cash	9,596	1,316
Net increase (decrease) in cash and cash equivalents	160,419	(13,555)
Cash and cash equivalents, beginning of period	421,157	506,885
Cash and cash equivalents, end of period	$ 581,576	$ 493,330

Organization

Organization	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	ORGANIZATION This report on Form 10-Q should be read in conjunction with the RenaissanceRe’s Annual Report on Form 10-K (“Form 10-K”) for the fiscal year ended December 31, 2016 . RenaissanceRe was formed under the laws of Bermuda on June 7, 1993 and is a global provider of reinsurance and insurance that specializes in matching well-structured risks with efficient sources of capital. Together with its wholly owned and majority-owned subsidiaries and DaVinciRe (as defined below), the Company provides property, casualty and specialty reinsurance and certain insurance solutions to customers, principally through intermediaries. The Company has offices in Bermuda, Ireland, Singapore, the United Kingdom, and the United States. • Renaissance Reinsurance, a Bermuda-domiciled reinsurance company, is the Company’s principal reinsurance subsidiary and provides property, casualty and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis. Effective October 1, 2016, each of Renaissance Reinsurance Specialty Risks Ltd. and Platinum Underwriters Bermuda, Ltd. merged into Renaissance Reinsurance, with Renaissance Reinsurance being the sole surviving entity. • Renaissance Reinsurance U.S. Inc. (“Renaissance Reinsurance U.S.”) is a reinsurance company domiciled in the state of Maryland that provides property, casualty and specialty reinsurance coverages to insurers and reinsurers, primarily in the Americas. • RenaissanceRe Underwriting Managers U.S. LLC, a specialty reinsurance agency domiciled in the state of Connecticut, provides specialty treaty reinsurance solutions on both a quota share and excess of loss basis; and writes business on behalf of RenaissanceRe Specialty U.S. Ltd. (“RenaissanceRe Specialty U.S.”), a Bermuda-domiciled reinsurer, which operates subject to U.S. federal income tax, and RenaissanceRe Syndicate 1458 (“Syndicate 1458”). • Syndicate 1458 is the Company’s Lloyd’s syndicate. RenaissanceRe Corporate Capital (UK) Limited (“RenaissanceRe CCL”), a wholly owned subsidiary of RenaissanceRe, is Syndicate 1458’s sole corporate member and RenaissanceRe Syndicate Management Ltd. (“RSML”), a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458. • The Company also manages property, casualty and specialty reinsurance business written on behalf of joint ventures, which principally include Top Layer Reinsurance Ltd. (“Top Layer Re”), recorded under the equity method of accounting, and DaVinci Reinsurance Ltd. (“DaVinci”). Because the Company owns a noncontrolling equity interest in, but controls a majority of the outstanding voting power of DaVinci’s parent, DaVinciRe Holdings Ltd. (“DaVinciRe”), the results of DaVinci and DaVinciRe are consolidated in the Company’s financial statements and all significant intercompany transactions have been eliminated. Redeemable noncontrolling interest - DaVinciRe represents the interests of external parties with respect to the net income and shareholders’ equity of DaVinciRe. Renaissance Underwriting Managers, Ltd. (“RUM”), a wholly owned subsidiary of RenaissanceRe, acts as exclusive underwriting manager for these joint ventures in return for fee-based income and profit participation. • RenaissanceRe Medici Fund Ltd. (“Medici”) is an exempted fund, incorporated under the laws of Bermuda. Medici’s objective is to seek to invest substantially all of its assets in various insurance based investment instruments that have returns primarily tied to property catastrophe risk. Third-party investors have subscribed for a portion of the participating, non-voting common shares of Medici. Because the Company owns a noncontrolling equity interest in, but controls a majority of the outstanding voting power of, Medici’s parent, RenaissanceRe Fund Holdings Ltd. (“Fund Holdings”), the results of Medici and Fund Holdings are consolidated in the Company’s financial statements and all significant inter-company transactions have been eliminated. Redeemable noncontrolling interest - Medici represents the interests of external parties with respect to the net income and shareholders’ equity of Medici. • Effective January 1, 2013, the Company formed and launched a managed joint venture, Upsilon RFO Re Ltd., formerly known as Upsilon Reinsurance II Ltd. (“Upsilon RFO”), a Bermuda domiciled special purpose insurer (“SPI”), to provide additional capacity to the worldwide aggregate and per-occurrence primary and retrocessional property catastrophe excess of loss market. Upsilon RFO is considered a variable interest entity (“VIE”) and the Company is considered the primary beneficiary. As a result, Upsilon RFO is consolidated by the Company and all significant inter-company transactions have been eliminated. • Effective November 13, 2014, the Company incorporated RenaissanceRe Upsilon Fund Ltd. (“Upsilon Fund”), an exempted Bermuda segregated accounts company. Upsilon Fund was formed to provide a fund structure through which third-party investors can invest in reinsurance risk managed by the Company. As a segregated accounts company, Upsilon Fund is permitted to establish segregated accounts to invest in and hold identified pools of assets and liabilities. Each pool of assets and liabilities in each segregated account is structured to be ring-fenced from any claims from the creditors of Upsilon Fund’s general account and from the creditors of other segregated accounts within Upsilon Fund. Third-party investors purchase redeemable, non-voting preference shares linked to specific segregated accounts of Upsilon Fund and own 100% of these shares. Upsilon Fund is an investment company and is considered a VIE. The Company is not considered the primary beneficiary of Upsilon Fund and, as a result, the Company does not consolidate the financial position and results of operations of Upsilon Fund. • Effective November 7, 2016, Fibonacci Reinsurance Ltd. ("Fibonacci Re"), a Bermuda-domiciled SPI, was formed to provide collateralized capacity to Renaissance Reinsurance and its affiliates. Fibonacci Re raised capital from third-party investors and the Company, via private placements of participating notes which are listed on the Bermuda Stock Exchange. Fibonacci Re is considered a VIE. The Company is not considered the primary beneficiary of Fibonacci Re and, as a result, the Company does not consolidate the financial position and results of operations of Fibonacci Re.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	SIGNIFICANT ACCOUNTING POLICIES There have been no material changes to the Company’s significant accounting policies as described in its Form 10-K for the year ended December 31, 2016 , except as noted below. BASIS OF PRESENTATION These consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, these unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position and results of operations as at the end of and for the periods presented. All significant intercompany accounts and transactions have been eliminated from these statements. Certain comparative information has been reclassified to conform to the current presentation. Because of the seasonality of the Company’s business, the results of operations and cash flows for any interim period will not necessarily be indicative of the results of operations and cash flows for the full fiscal year or subsequent quarters. USE OF ESTIMATES IN FINANCIAL STATEMENTS The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the reserve for claims and claim expenses; reinsurance recoverables, including allowances for reinsurance recoverables deemed uncollectible; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges; and the Company’s deferred tax valuation allowance. RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 was issued to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and the classification of taxes paid on the statements of cash flows. ASU 2016-09 became effective for the Company in annual and interim periods beginning after December 15, 2016. The cumulative effect of the adoption of ASU 2016-09 was a $2.2 million increase to opening retained earnings as of January 1, 2017. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED Revenue from Contracts with Customers In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 provides comprehensive guidance on the recognition of revenue from customers arising from the transfer of goods and services. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also provides guidance on accounting for certain contract costs and will also require new disclosures. ASU 2014-09 was to be effective for public business entities in annual and interim periods beginning after December 15, 2016, however in July 2015, the FASB decided to defer by one year the effective dates of ASU 2014-09, and as a result, ASU 2014-09 will be effective for public business entities in annual and interim periods beginning after December 15, 2017. Early adoption is permitted. ASU 2014-09 notably excludes the accounting for insurance contracts, leases, financial instruments and guarantees. The Company is currently evaluating the impact of this guidance, with its implementation efforts primarily focused on other income (loss) on its consolidated statements of operations. The adoption of ASU 2014-09 is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous guidance. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early application is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option, requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets. ASU 2016-01 is effective for public business entities in annual and interim periods beginning after December 15, 2017. Earlier adoption is generally not permitted, except for certain specific provisions of ASU 2016-01. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 modifies the recognition of credit losses by replacing the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is applicable to financial assets such as loans, debt securities, trade receivables, off-balance sheet credit exposures, reinsurance receivables, and other financial assets that have the contractual right to receive cash. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. The Company's invested assets are measured at fair value through net income, and therefore those invested assets would not be impacted by the adoption of ASU 2016-13. The Company has other financial assets, such as reinsurance recoverables, that could be impacted by the adoption of ASU 2016-13. ASU 2016-13 is effective for public business entities that are SEC filers for annual and interim periods beginning after December 15, 2019. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 clarifies the classification of receipts and payments in the statement of cash flows. ASU 2016-15 provides guidance related to (1) settlement and payment of zero coupon debt instruments, (2) contingent consideration, (3) proceeds from settlement of insurance claims, (4) proceeds from settlement of corporate and bank owned life insurance policies, (5) distributions from equity method investees, (6) cash receipts from beneficial interests obtained by a transferor, and (7) general guidelines for cash receipts and payments that have more than one aspect of classification. ASU 2016-15 is effective for public business entities for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of cash flows. Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). ASU 2016-16 requires entities to recognize the income tax consequences of intra-entity transfers of assets other than inventory when the transfers occur; this is a change from current guidance which prohibits the recognition of current and deferred income taxes until the underlying assets have been sold to outside entities. ASU 2016-16 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). Among other things, ASU 2017-04 requires the following: (1) the elimination of step 2 of the goodwill impairment test; entities will no longer utilize the implied fair value of their assets and liabilities for purposes of testing goodwill for impairment, (2) the quantitative portion of the goodwill impairment test will be performed by comparing the fair value of a reporting unit with its carrying amount; an impairment charge is to be recognized for the excess of carrying amount over fair value, but only to the extent of the amount of goodwill allocated to that reporting unit, and (3) foreign currency translation adjustments are not to be allocated to a reporting unit from an entity’s accumulated other comprehensive income; the reporting unit’s carrying amount should include only the currently translated balances of the assets and liabilities assigned to the reporting unit. ASU 2017-04 is effective for public business entities that are SEC filers for annual periods, or any interim goodwill impairment tests in annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Investments

Investments	9 Months Ended
	Sep. 30, 2017
Investments [Abstract]
Investments	INVESTMENTS Fixed Maturity Investments Trading The following table summarizes the fair value of fixed maturity investments trading: September 30, December 31, U.S. treasuries $ 2,956,952 $ 2,617,894 Agencies 41,109 90,972 Municipal 521,220 519,069 Non-U.S. government (Sovereign debt) 177,855 333,224 Non-U.S. government-backed corporate 121,892 133,300 Corporate 2,028,750 1,877,243 Agency mortgage-backed 499,310 462,493 Non-agency mortgage-backed 299,530 258,944 Commercial mortgage-backed 263,029 409,747 Asset-backed 183,322 188,358 Total fixed maturity investments trading $ 7,092,969 $ 6,891,244 Contractual maturities of fixed maturity investments trading are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2017 Amortized Cost Fair Value Due in less than one year $ 366,988 $ 367,091 Due after one through five years 4,326,788 4,324,948 Due after five through ten years 985,535 1,001,975 Due after ten years 151,964 153,764 Mortgage-backed 1,047,676 1,061,869 Asset-backed 182,536 183,322 Total $ 7,061,487 $ 7,092,969 Equity Investments Trading The following table summarizes the fair value of equity investments trading: September 30, December 31, Financials $ 275,373 $ 275,065 Communications and technology 45,592 36,770 Industrial, utilities and energy 32,922 30,303 Consumer 22,613 20,501 Healthcare 21,113 17,245 Basic materials 4,422 3,429 Total $ 402,035 $ 383,313 Pledged Investments At September 30, 2017 , $3.3 billion of cash and investments at fair value were on deposit with, or in trust accounts for the benefit of, various counterparties, including with respect to the Company’s letter of credit facilities ( December 31, 2016 - $2.7 billion ). Of this amount, $1.4 billion is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities ( December 31, 2016 - $842.6 million ). Reverse Repurchase Agreements At September 30, 2017 , the Company held $477.5 million ( December 31, 2016 - $78.7 million ) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of short term investments on the Company’s consolidated balance sheets. The required collateral for these loans typically includes high-quality, readily marketable instruments at a minimum amount of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. Net Investment Income The components of net investment income are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Fixed maturity investments $ 45,305 $ 39,959 $ 133,080 $ 122,056 Short term investments 2,771 1,174 7,476 3,401 Equity investments 930 797 2,630 3,325 Other investments Private equity investments 6,371 4,572 20,784 (430 ) Other (11,491 ) 8,765 (4,520 ) 17,109 Cash and cash equivalents 352 246 836 584 44,238 55,513 160,286 146,045 Investment expenses (3,981 ) (4,090 ) (11,541 ) (11,635 ) Net investment income $ 40,257 $ 51,423 $ 148,745 $ 134,410 Net Realized and Unrealized Gains on Investments Net realized and unrealized gains on investments are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Gross realized gains $ 16,343 $ 20,383 $ 43,053 $ 60,794 Gross realized losses (6,126 ) (3,363 ) (29,902 ) (25,832 ) Net realized gains on fixed maturity investments 10,217 17,020 13,151 34,962 Net unrealized gains (losses) on fixed maturity investments trading 5,545 (4,235 ) 48,940 125,501 Net realized and unrealized (losses) gains on investments-related derivatives (4,020 ) 1,727 (4,344 ) (26,873 ) Net realized gains on equity investments trading 13,675 127 49,736 14,038 Net unrealized gains (losses) on equity investments trading 16,635 45,231 36,055 43,667 Net realized and unrealized gains on investments $ 42,052 $ 59,870 $ 143,538 $ 191,295

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The use of fair value to measure certain assets and liabilities with resulting unrealized gains or losses is pervasive within the Company’s consolidated financial statements. Fair value is defined under accounting guidance currently applicable to the Company to be the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between open market participants at the measurement date. The Company recognizes the change in unrealized gains and losses arising from changes in fair value in its consolidated statements of operations. FASB ASC Topic Fair Value Measurements and Disclosures prescribes a fair value hierarchy that prioritizes the inputs to the respective valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to valuation techniques that use at least one significant input that is unobservable (Level 3). The three levels of the fair value hierarchy are described below: • Fair values determined by Level 1 inputs utilize unadjusted quoted prices obtained from active markets for identical assets or liabilities for which the Company has access. The fair value is determined by multiplying the quoted price by the quantity held by the Company; • Fair values determined by Level 2 inputs utilize inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals, broker quotes and certain pricing indices; and • Level 3 inputs are based all or in part on significant unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. In these cases, significant management assumptions can be used to establish management’s best estimate of the assumptions used by other market participants in determining the fair value of the asset or liability. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement of the asset or liability. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and the Company considers factors specific to the asset or liability. In order to determine if a market is active or inactive for a security, the Company considers a number of factors, including, but not limited to, the spread between what a seller is asking for a security and what a buyer is bidding for the same security, the volume of trading activity for the security in question, the price of the security compared to its par value (for fixed maturity investments), and other factors that may be indicative of market activity. There have been no material changes in the Company’s valuation techniques, nor have there been any transfers between Level 1 and Level 2, or Level 2 and 3 during the period represented by these consolidated financial statements. Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets: At September 30, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,956,952 $ 2,956,952 $ — $ — Agencies 41,109 — 41,109 — Municipal 521,220 — 521,220 — Non-U.S. government (Sovereign debt) 177,855 — 177,855 — Non-U.S. government-backed corporate 121,892 — 121,892 — Corporate 2,028,750 — 2,028,750 — Agency mortgage-backed 499,310 — 499,310 — Non-agency mortgage-backed 299,530 — 299,530 — Commercial mortgage-backed 263,029 — 263,029 — Asset-backed 183,322 — 183,322 — Total fixed maturity investments 7,092,969 2,956,952 4,136,017 — Short term investments 1,497,262 — 1,497,262 — Equity investments trading 402,035 402,035 — — Other investments Catastrophe bonds 332,044 — 332,044 — Private equity partnerships (1) 196,280 — — — Senior secured bank loan funds (1) 19,572 — — — Hedge funds (1) 596 — — — Total other investments 548,492 — 332,044 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (3,493 ) — — (3,493 ) Derivatives (3) 1,944 (114 ) 2,058 — Other (8,777 ) — (8,777 ) — Total other assets and (liabilities) (10,326 ) (114 ) (6,719 ) (3,493 ) $ 9,530,432 $ 3,358,873 $ 5,958,604 $ (3,493 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at September 30, 2017 was $1.8 million and $5.3 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,617,894 $ 2,617,894 $ — $ — Agencies 90,972 — 90,972 — Municipal 519,069 — 519,069 — Non-U.S. government (Sovereign debt) 333,224 — 333,224 — Non-U.S. government-backed corporate 133,300 — 133,300 — Corporate 1,877,243 — 1,877,243 — Agency mortgage-backed 462,493 — 462,493 — Non-agency mortgage-backed 258,944 — 258,944 — Commercial mortgage-backed 409,747 — 409,747 — Asset-backed 188,358 — 188,358 — Total fixed maturity investments 6,891,244 2,617,894 4,273,350 — Short term investments 1,368,379 — 1,368,379 — Equity investments trading 383,313 383,313 — — Other investments Catastrophe bonds 335,209 — 335,209 — Private equity partnerships (1) 191,061 — — — Senior secured bank loan funds (1) 22,040 — — — Hedge funds (1) 1,495 — — — Total other investments 549,805 — 335,209 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (13,004 ) — — (13,004 ) Derivatives (3) (8,922 ) (646 ) (8,276 ) — Other (13,105 ) — (13,105 ) — Total other assets and (liabilities) (35,031 ) (646 ) (21,381 ) (13,004 ) $ 9,157,710 $ 3,000,561 $ 5,955,557 $ (13,004 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at December 31, 2016 was $4.4 million and $17.4 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. Level 1 and Level 2 Assets and Liabilities Measured at Fair Value Fixed Maturity Investments Fixed maturity investments included in Level 1 consist of the Company’s investments in U.S. treasuries. Fixed maturity investments included in Level 2 are agencies, municipal, non-U.S. government, non-U.S. government-backed corporate, corporate, agency mortgage-backed, non-agency mortgage-backed, commercial mortgage-backed and asset-backed. The Company’s fixed maturity investments are primarily priced using pricing services, such as index providers and pricing vendors, as well as broker quotations. In general, the pricing vendors provide pricing for a high volume of liquid securities that are actively traded. For securities that do not trade on an exchange, the pricing services generally utilize market data and other observable inputs in matrix pricing models to determine month end prices. Observable inputs include benchmark yields, reported trades, broker-dealer quotes, issuer spreads, bids, offers, reference data and industry and economic events. Index pricing generally relies on market traders as the primary source for pricing; however, models are also utilized to provide prices for all index eligible securities. The models use a variety of observable inputs such as benchmark yields, transactional data, dealer runs, broker-dealer quotes and corporate actions. Prices are generally verified using third-party data. Securities which are priced by an index provider are generally included in the index. In general, broker-dealers value securities through their trading desks based on observable inputs. The methodologies include mapping securities based on trade data, bids or offers, observed spreads, and performance on newly issued securities. Broker-dealers also determine valuations by observing secondary trading of similar securities. Prices obtained from broker quotations are considered non-binding, however they are based on observable inputs and by observing secondary trading of similar securities obtained from active, non-distressed markets. The Company considers these Level 2 inputs as they are corroborated with other market observable inputs. The techniques generally used to determine the fair value of the Company’s fixed maturity investments are detailed below by asset class. U.S. treasuries Level 1 - At September 30, 2017 , the Company’s U.S. treasuries fixed maturity investments were primarily priced by pricing services and had a weighted average effective yield of 1.6% and a weighted average credit quality of AA ( December 31, 2016 - 1.4% and AA, respectively). When pricing these securities, the pricing services utilize daily data from many real time market sources, including active broker dealers. Certain data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source is used for each issue and maturity date. Agencies Level 2 - At September 30, 2017 , the Company’s agency fixed maturity investments had a weighted average effective yield of 1.6% and a weighted average credit quality of AA ( December 31, 2016 - 2.0% and AA, respectively). The issuers of the Company’s agency fixed maturity investments primarily consist of the Federal National Mortgage Association, the Federal Home Loan Mortgage Corporation and other agencies. Fixed maturity investments included in agencies are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources and integrate other observations from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The fair value of each security is individually computed using analytical models which incorporate option adjusted spreads and other daily interest rate data. Municipal Level 2 - At September 30, 2017 , the Company’s municipal fixed maturity investments had a weighted average effective yield of 1.9% and a weighted average credit quality of AA ( December 31, 2016 - 2.4% and AA, respectively). The Company’s municipal fixed maturity investments are primarily priced by pricing services. When evaluating these securities, the pricing services gather information regarding the security from third-party sources such as trustees, paying agents or issuers. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The pricing services also consider the specific terms and conditions of the securities, including any specific features which may influence risk. In certain instances, securities are individually evaluated using a spread over widely accepted market benchmarks. Non-U.S. government (Sovereign debt) Level 2 - At September 30, 2017 , the Company’s non-U.S. government fixed maturity investments had a weighted average effective yield of 1.7% and a weighted average credit quality of AAA ( December 31, 2016 - 1.6% and AAA, respectively). The issuers of securities in this sector are non-U.S. governments and their respective agencies as well as supranational organizations. Securities held in these sectors are primarily priced by pricing services that employ proprietary discounted cash flow models to value the securities. Key quantitative inputs for these models are daily observed benchmark curves for treasury, swap and high issuance credits. The pricing services then apply a credit spread for each security which is developed by in-depth and real time market analysis. For securities in which trade volume is low, the pricing services utilize data from more frequently traded securities with similar attributes. These models may also be supplemented by daily market and credit research for international markets. Non-U.S. government-backed corporate Level 2 - At September 30, 2017 , the Company’s non-U.S. government-backed corporate fixed maturity investments had a weighted average effective yield of 1.9% and a weighted average credit quality of AA ( December 31, 2016 - 1.5% and AAA, respectively). Non-U.S. government-backed fixed maturity investments are primarily priced by pricing services that employ proprietary discounted cash flow models to value the securities. Key quantitative inputs for these models are daily observed benchmark curves for treasury, swap and high issuance credits. The pricing services then apply a credit spread to the respective curve for each security which is developed by in-depth and real time market analysis. For securities in which trade volume is low, the pricing services utilize data from more frequently traded securities with similar attributes. These models may also be supplemented by daily market and credit research for international markets. Corporate Level 2 - At September 30, 2017 , the Company’s corporate fixed maturity investments principally consisted of U.S. and international corporations and had a weighted average effective yield of 3.5% and a weighted average credit quality of BBB ( December 31, 2016 - 3.7% and BBB, respectively). The Company’s corporate fixed maturity investments are primarily priced by pricing services. When evaluating these securities, the pricing services gather information from market sources regarding the issuer of the security and obtain credit data, as well as other observations, from markets and sector news. Evaluations are updated by obtaining broker dealer quotes and other market information including actual trade volumes, when available. The pricing services also consider the specific terms and conditions of the securities, including any specific features which may influence risk. In certain instances, securities are individually evaluated using a spread which is added to the U.S. treasury curve or a security specific swap curve as appropriate. Agency mortgage-backed Level 2 - At September 30, 2017 , the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average effective yield of 2.9% , a weighted average credit quality of AA and a weighted average life of 6.3 years ( December 31, 2016 - 2.9% , AA and 6.9 years, respectively). The Company’s agency mortgage-backed fixed maturity investments are primarily priced by pricing services using a mortgage pool specific model which utilizes daily inputs from the active to be announced market which is very liquid, as well as the U.S. treasury market. The model also utilizes additional information, such as the weighted average maturity, weighted average coupon and other available pool level data which is provided by the sponsoring agency. Valuations are also corroborated with daily active market quotes. Non-agency mortgage-backed Level 2 - The Company’s non-agency mortgage-backed fixed maturity investments include non-agency prime residential mortgage-backed and non-agency Alt-A fixed maturity investments. The Company has no fixed maturity investments that were classified as sub-prime at the time of purchase held in its fixed maturity investments portfolio. At September 30, 2017 , the Company’s non-agency prime residential mortgage-backed fixed maturity investments had a weighted average effective yield of 3.8% , a weighted average credit quality of non-investment grade, and a weighted average life of 5.0 years ( December 31, 2016 - 4.3% , BBB and 5.1 years, respectively). The Company’s non-agency Alt-A fixed maturity investments held at September 30, 2017 had a weighted average effective yield of 3.7% , a weighted average credit quality of non-investment grade and a weighted average life of 6.2 years ( December 31, 2016 - 5.2% , non-investment grade and 6.0 years, respectively). Securities held in these sectors are primarily priced by pricing services using an option adjusted spread model or other relevant models, which principally utilize inputs including benchmark yields, available trade information or broker quotes, and issuer spreads. The pricing services also review collateral prepayment speeds, loss severity and delinquencies among other collateral performance indicators for the securities valuation, when applicable. Commercial mortgage-backed Level 2 - At September 30, 2017 , the Company’s commercial mortgage-backed fixed maturity investments had a weighted average effective yield of 3.1% , a weighted average credit quality of AAA, and a weighted average life of 4.5 years ( December 31, 2016 - 2.6% , AAA and 3.9 years, respectively). Securities held in these sectors are primarily priced by pricing services. The pricing services apply dealer quotes and other available trade information such as bids and offers, prepayment speeds which may be adjusted for the underlying collateral or current price data, the U.S. treasury curve and swap curve as well as cash settlement. The pricing services discount the expected cash flows for each security held in this sector using a spread adjusted benchmark yield based on the characteristics of the security. Asset-backed Level 2 - At September 30, 2017 , the Company’s asset-backed fixed maturity investments had a weighted average effective yield of 2.4% , a weighted average credit quality of AAA and a weighted average life of 2.8 years ( December 31, 2016 - 2.3% , AAA and 2.6 years, respectively). The underlying collateral for the Company’s asset-backed fixed maturity investments primarily consists of bank loans, student loans, credit card receivables, auto loans and other receivables. Securities held in these sectors are primarily priced by pricing services. The pricing services apply dealer quotes and other available trade information such as bids and offers, prepayment speeds which may be adjusted for the underlying collateral or current price data, the U.S. treasury curve and swap curve as well as cash settlement. The pricing services determine the expected cash flows for each security held in this sector using historical prepayment and default projections for the underlying collateral and current market data. In addition, a spread is applied to the relevant benchmark and used to discount the cash flows noted above to determine the fair value of the securities held in this sector. Short Term Investments Level 2 - At September 30, 2017 , the Company’s short term investments had a weighted average effective yield of 1.1% and a weighted average credit quality of AAA ( December 31, 2016 - 0.7% and AAA, respectively). The fair value of the Company’s portfolio of short term investments is generally determined using amortized cost which approximates fair value and, in certain cases, in a manner similar to the Company’s fixed maturity investments noted above. Equity Investments, Classified as Trading Level 1 - The fair value of the Company’s portfolio of equity investments, classified as trading is primarily priced by pricing services, reflecting the closing price quoted for the final trading day of the period. When pricing these securities, the pricing services utilize daily data from many real time market sources, including applicable securities exchanges. All data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source was used for each security. Other investments Catastrophe bonds Level 2 - The Company’s other investments include investments in catastrophe bonds which are recorded at fair value based on broker or underwriter bid indications. Other assets and liabilities Derivatives Level 1 and Level 2 - Other assets and liabilities include certain derivatives entered into by the Company. The fair value of these transactions includes certain exchange traded futures contracts which are considered Level 1, and foreign currency contracts and certain credit derivatives, determined using standard industry valuation models and considered Level 2, as the inputs to the valuation model are based on observable market inputs. For credit derivatives, these inputs include credit spreads, credit ratings of the underlying referenced security, the risk free rate and the contract term. For foreign currency contracts, these inputs include spot rates and interest rate curves. Other Level 2 - The liabilities measured at fair value and included in Level 2 at September 30, 2017 of $8.8 million are comprised of cash settled restricted stock units (“CSRSU”) that form part of the Company’s compensation program. The fair value of the Company’s CSRSUs is determined using observable exchange traded prices for the Company’s common shares. Level 3 Assets and Liabilities Measured at Fair Value Below is a summary of quantitative information regarding the significant observable and unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis: At September 30, 2017 Fair Value (Level 3) Valuation Technique Unobservable (U) and Observable (O) Inputs Low High Weighted Average or Actual Other assets and (liabilities) Assumed and ceded (re)insurance contracts $ 582 Internal valuation model Bond price (U) $ 101.28 $ 109.27 $ 105.64 Liquidity discount (U) n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (4,075 ) Internal valuation model Net undiscounted cash flows (U) n/a n/a $ (4,733 ) Expected loss ratio (U) n/a n/a 24.3 % Net acquisition expense ratio (O) n/a n/a 13.4 % Contract period (O) 2.0 years 4.7 years 4.1 years Discount rate (U) n/a n/a 1.9 % Total other assets and (liabilities) $ (3,493 ) Fixed Maturity Investments Corporate Level 3 - Previously, the Company’s corporate fixed maturity investments included an investment in the preferred equity of an insurance holding company. The Company measured the fair value of this investment using a discounted cash flow model and ultimately sold this investment during the year ended December 31, 2016. Other assets and liabilities Assumed and ceded (re)insurance contracts Level 3 - At September 30, 2017 , the Company had a $0.6 million net asset related to an assumed reinsurance contract accounted for at fair value, with the fair value obtained through the use of an internal valuation model. The inputs to the internal valuation model are principally based on indicative pricing obtained from independent brokers and pricing vendors for similarly structured marketable securities. The most significant unobservable inputs include prices for similar marketable securities and a liquidity premium. The Company considers the prices for similar securities to be unobservable, as there is little, if any market activity for these similar assets. In addition, the Company has estimated a liquidity premium that would be required if the Company attempted to effectively exit its position by executing a short sale of these securities. Generally, an increase in the prices for similar marketable securities or a decrease in the liquidity premium would result in an increase in the expected profit and ultimate fair value of this assumed reinsurance contract. Level 3 - At September 30, 2017 , the Company had a $4.1 million net liability related to assumed and ceded (re)insurance contracts accounted for at fair value, with the fair value obtained through the use of an internal valuation model. The inputs to the internal valuation model are principally based on proprietary data as observable market inputs are generally not available. The most significant unobservable inputs include the assumed and ceded expected net cash flows related to the contracts, including the expected premium, acquisition expenses and losses; the expected loss ratio and the relevant discount rate used to present value the net cash flows. The contract period and acquisition expense ratio are considered observable input as each is defined in the contract. The negative acquisition expense ratio used to determine the fair value of the contracts at September 30, 2017 is the result of override commissions on the contracts being higher than the gross acquisition expenses. Generally, an increase in the net expected cash flows and expected term of the contract and a decrease in the discount rate, expected loss ratio or acquisition expense ratio, would result in an increase in the expected profit and ultimate fair value of these assumed and ceded (re)insurance contracts. Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation. Other assets and (liabilities) Balance - July 1, 2017 $ (9,502 ) Total realized and unrealized gains Included in other income 135 Purchases (63 ) Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,525 Purchases 49 Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - July 1, 2016 $ — $ (2,680 ) $ (2,680 ) Total realized and unrealized gains Included in other income — 795 795 Purchases — (10,127 ) (10,127 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 4,587 4,587 Purchases — (10,700 ) (10,700 ) Settlements (7,500 ) — (7,500 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 ) Financial Instruments Disclosed, But Not Carried, at Fair Value The Company uses various financial instruments in the normal course of its business. The Company’s insurance contracts are excluded from the fair value of financial instruments accounting guidance, unless the Company elects the fair value option, and therefore, are not included in the amounts discussed herein. The carrying values of cash and cash equivalents, accrued investment income, receivables for investments sold, certain other assets, payables for investments purchased, certain other liabilities, and other financial instruments not included herein approximated their fair values. Debt Included on the Company’s consolidated balance sheet at September 30, 2017 were debt obligations of $989.2 million ( December 31, 2016 - $948.7 million ). At September 30, 2017 , the fair value of the Company’s debt obligations was $1,034.2 million ( December 31, 2016 – $964.8 million ). The fair value of the Company’s debt obligations is determined using indicative market pricing obtained from third-party service providers, which the Company considers Level 2 in the fair value hierarchy. There have been no changes during the period in the Company’s valuation technique used to determine the fair value of the Company’s debt obligations. The Fair Value Option for Financial Assets and Financial Liabilities The Company has elected to account for certain financial assets and financial liabilities at fair value using the guidance under FASB ASC Topic Financial Instruments as the Company believes it represents the most meaningful measurement basis for these assets and liabilities. Below is a summary of the balances the Company has elected to account for at fair value: September 30, December 31, Other investments $ 548,492 $ 549,805 Other assets $ 2,383 $ 4,379 Other liabilities $ 5,876 $ 17,383 Included in net investment income for the three and nine months ended September 30, 2017 were net unrealized losses of $9.8 million and gains of $2.7 million related to the changes in fair value of other investments ( 2016 – gains of $9.4 million and $6.1 million ). Included in other income for the three and nine months ended September 30, 2017 were net unrealized gains of $Nil and $Nil related to the changes in the fair value of other assets and liabilities ( 2016 - $Nil and $Nil ). Measuring the Fair Value of Other Investments Using Net Asset Valuations The table below shows the Company’s portfolio of other investments measured using net asset valuations as a practical expedient: At September 30, 2017 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity partnerships $ 196,280 $ 300,482 See below See below See below Senior secured bank loan funds 19,572 23,758 See below See below See below Hedge funds 596 — See below See below See below Total other investments measured using net asset valuations $ 216,448 $ 324,240 Private equity partnerships – The Company’s investments in private equity partnerships included alternative asset limited partnerships (or similar corporate structures) that invest in certain private equity asset classes, including U.S. and global leveraged buyouts, mezzanine investments, distressed securities, real estate, and oil, gas and power. The Company generally has no right to redeem its interest in any of these private equity partnerships in advance of dissolution of the applicable private equity partnership. Instead, the nature of these investments is that distributions are received by the Company in connection with the liquidation of the underlying assets of the respective private equity partnership. It is estimated that the majority of the underlying assets of the limited partnerships would liquidate over 7 to 10 years from inception of the respective limited partnership. Senior secured bank loan funds – At September 30, 2017 , the Company had $19.6 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. It is estimated that the majority of the underlying assets in these closed end funds would liquidate over 4 to 5 years from inception of the applicable fund. Hedge funds – The Company invests in hedge funds that pursue multiple strategies. The Company’s investments in hedge funds at September 30, 2017 were $0.6 million of so called “side pocket” investments which are not redeemable at the option of the shareholder. The Company will retain its interest in the side pocket investments until the underlying investments attributable to such side pockets are liquidated, realized or deemed realized at the discretion of the fund manager.

Reinsurance

Reinsurance	9 Months Ended
	Sep. 30, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]
Reinsurance	REINSURANCE The Company purchases reinsurance and other protection to manage its risk portfolio and to reduce its exposure to large losses. The Company currently has in place contracts that provide for recovery of a portion of certain claims and claim expenses, generally in excess of various retentions or on a proportional basis. In addition to loss recoveries, certain of the Company’s ceded reinsurance contracts provide for payments of additional premiums, for reinstatement premiums and for lost no-claims bonuses, which are incurred when losses are ceded to the respective reinsurance contracts. The Company remains liable to the extent that any reinsurance company fails to meet its obligations. The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred: Three months ended Nine months ended September 30, September 30, September 30, September 30, Premiums written Direct $ 64,040 $ 53,488 $ 205,253 $ 154,205 Assumed 576,229 376,736 2,184,521 1,897,280 Ceded (157,048 ) (146,002 ) (806,672 ) (735,672 ) Net premiums written $ 483,221 $ 284,222 $ 1,583,102 $ 1,315,813 Premiums earned Direct $ 61,908 $ 43,097 $ 176,433 $ 114,173 Assumed 712,499 471,097 1,731,845 1,392,278 Ceded (226,615 ) (167,673 ) (612,176 ) (454,922 ) Net premiums earned $ 547,792 $ 346,521 $ 1,296,102 $ 1,051,529 Claims and claim expenses Gross claims and claim expenses incurred $ 2,482,510 $ 153,846 $ 2,924,217 $ 540,696 Claims and claim expenses recovered (1,260,814 ) (41,271 ) (1,366,853 ) (133,766 ) Net claims and claim expenses incurred $ 1,221,696 $ 112,575 $ 1,557,364 $ 406,930

Reserve for Claims and Claim Ex

Reserve for Claims and Claim Expenses	9 Months Ended
	Sep. 30, 2017
Insurance Loss Reserves [Abstract]
Reserve for Claims and Claim Expenses	RESERVE FOR CLAIMS AND CLAIM EXPENSES The Company believes the most significant accounting judgment made by management is its estimate of claims and claim expense reserves. Claims and claim expense reserves represent estimates, including actuarial and statistical projections at a given point in time, of the ultimate settlement and administration costs for unpaid claims and claim expenses arising from the insurance and reinsurance contracts the Company sells. The Company establishes its claims and claim expense reserves by taking claims reported to the Company by insureds and ceding companies, but which have not yet been paid (“case reserves”), adding estimates for the anticipated cost of claims incurred but not yet reported to the Company, or incurred but not enough reported to the Company (collectively referred to as “IBNR”) and, if deemed necessary, adding costs for additional case reserves which represent the Company’s estimates for claims related to specific contracts previously reported to the Company which it believes may not be adequately estimated by the client as of that date, or adequately covered in the application of IBNR. The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR: At September 30, 2017 Case Reserves Additional Case Reserves IBNR Total Property $ 310,871 $ 416,758 $ 1,917,573 $ 2,645,202 Casualty and Specialty 655,328 132,755 1,734,475 2,522,558 Other 9,904 — 14,649 24,553 Total $ 976,103 $ 549,513 $ 3,666,697 $ 5,192,313 At December 31, 2016 Property $ 214,954 $ 186,308 $ 226,512 $ 627,774 Casualty and Specialty 591,705 105,419 1,498,002 2,195,126 Other 6,935 — 18,459 25,394 Total $ 813,594 $ 291,727 $ 1,742,973 $ 2,848,294 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Nine months ended September 30, 2017 2016 Net reserves as of January 1 $ 2,568,730 $ 2,632,519 Net incurred related to: Current year 1,561,027 483,574 Prior years (3,663 ) (76,644 ) Total net incurred 1,557,364 406,930 Net paid related to: Current year 158,685 39,971 Prior years 396,411 391,047 Total net paid 555,096 431,018 Foreign exchange 33,011 11,899 Net reserves as of September 30 3,604,009 2,620,330 Reinsurance recoverable as of September 30 1,588,304 240,769 Gross reserves as of September 30 $ 5,192,313 $ 2,861,099 Prior Year Development of the Reserve for Net Claims and Claim Expenses The Company’s estimates of claims and claim expense reserves are not precise in that, among other things, they are based on predictions of future developments and estimates of future trends and other variable factors. Some, but not all, of the Company’s reserves are further subject to the uncertainty inherent in actuarial methodologies and estimates. Because a reserve estimate is simply an insurer’s estimate at a point in time of its ultimate liability, and because there are numerous factors that affect reserves and claims payments that cannot be determined with certainty in advance, the Company’s ultimate payments will vary, perhaps materially, from its estimates of reserves. If the Company determines in a subsequent period that adjustments to its previously established reserves are appropriate, such adjustments are recorded in the period in which they are identified. On a net basis, the Company’s cumulative favorable or unfavorable development is generally reduced by offsetting changes in its reinsurance recoverables, as well as changes to loss related premiums such as reinstatement premiums and redeemable noncontrolling interest for changes in claims and claim expenses that impact DaVinciRe, all of which generally move in the opposite direction to changes in the Company’s ultimate claims and claim expenses. The following table details the Company’s prior year development by segment of its liability for unpaid claims and claim expenses: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Property $ (16,968 ) $ (37,512 ) Casualty and Specialty 14,015 (38,327 ) Other (710 ) (805 ) Total favorable development of prior accident years net claims and claim expenses $ (3,663 ) $ (76,644 ) Changes to prior year estimated claims reserves decreased the Company’s net loss by $3.7 million during the nine months ended September 30, 2017 , ( 2016 - increased the Company’s net income by $76.6 million ), excluding the consideration of changes in reinstatement, adjustment or other premium changes, profit commissions, redeemable noncontrolling interest - DaVinciRe and income tax. Property Segment The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events April and May U.S. Tornadoes (2011) $ (4,163 ) $ (3,396 ) Tohoku Earthquake and Tsunami (2011) — (5,894 ) New Zealand Earthquake (2010) 5,001 8,710 New Zealand Earthquake (2011) 5,807 — Other (3,881 ) (7,435 ) Total large catastrophe events 2,764 (8,015 ) Small catastrophe events Fort McMurray Wildfire (2016) (6,386 ) — Tianjin Explosion (2015) (4,896 ) (6,163 ) Other (9,293 ) (23,334 ) Total small catastrophe events (20,575 ) (29,497 ) Total catastrophe net claims and claim expenses (17,811 ) (37,512 ) Actuarial assumption changes 843 — Total net favorable development of prior accident years net claims and claim expenses $ (16,968 ) $ (37,512 ) The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the nine months ended September 30, 2017 of $17.0 million was comprised of net adverse development of $2.8 million related to large catastrophe events, net favorable development of $20.6 million related to small catastrophe events and $0.8 million of adverse development associated with actuarial assumption changes. Included in net adverse development of prior accident years net claims and claim expenses from large events was adverse development of $5.8 million related to the 2011 New Zealand Earthquake and $5.0 million related to the 2010 New Zealand Earthquake due to increases in the estimated expected losses associated with these events. Partially offsetting these events was favorable development of $4.2 million and $3.9 million related to the 2011 April and May U.S. Tornadoes and a number of other events, respectively, due to reductions in the estimated ultimate losses associated with these events. Included in net favorable development of prior accident years net claims and claims expenses from small events was a reduction in the estimated ultimate losses associated with the 2016 Fort McMurray Wildfire of $6.4 million and the 2015 Tianjin Explosion of $4.9 million . In addition, the Company’s Property segment experienced net favorable development of $9.3 million associated with a number of other small catastrophe events. The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the nine months ended September 30, 2016 of $37.5 million was principally comprised of net favorable development of $29.5 million associated with small catastrophe events related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods. In addition, the Company experienced net favorable development of $8.0 million from large catastrophe events due principally to a decrease in the estimated ultimate losses for the 2011 Tohoku Earthquake and the April and May 2011 Tornadoes of $5.9 million and $3.4 million , respectively, and net favorable development of $7.4 million associated with a number of other large catastrophe events. Partially offsetting this net favorable development of large catastrophe events was an increase in the estimated ultimate losses for the 2010 New Zealand Earthquake of $8.7 million . In addition, the Company’s Property segment experienced net favorable development due to reductions in the estimated ultimate losses from the 2015 Tianjin Explosion of $6.2 million and net favorable development of $23.3 million associated with a number of other small catastrophe events. Casualty and Specialty Segment The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Actuarial methods - actual reported claims lower than expected claims $ (17,004 ) $ (32,209 ) Ogden Rate change 33,481 — Actuarial assumption changes (2,462 ) (6,118 ) Total adverse (favorable) development of prior accident years net claims and claim expenses $ 14,015 $ (38,327 ) The net adverse development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment in the nine months ended September 30, 2017 of $14.0 million was driven by $33.5 million of adverse development associated with the change in the discount rate used to calculate lump sum awards in U.K. bodily injury cases (the “Ogden Rate”), from 2.5% , to minus 0.75% . Offsetting the adverse development due to the impact of the Ogden Rate change was $17.0 million of net favorable development in the first nine months of 2017 related to actual reported losses coming in lower than expected on attritional net claims and claim expenses across a number of lines of business and $2.5 million of net favorable development associated with actuarial assumption changes. The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment in the nine months ended September 30, 2016 of $38.3 million was driven by $32.2 million of favorable development related to actual reported net claims and claim expenses coming in lower than expected on prior accident years events and $6.1 million of favorable development associated with actuarial assumption changes.

Debt and Credit Facilities

Debt and Credit Facilities	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Debt and Credit Facilities	DEBT AND CREDIT FACILITIES Except as noted below, there have been no material changes to the Company’s debt and credit facilities as described in its Form 10-K for the year ended December 31, 2016 . Debt Obligations A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below: September 30, 2017 December 31, 2016 Fair Value Carrying Value Fair Value Carrying Value 3.450% Senior Notes due 2027 $ 296,589 $ 295,179 $ — $ — 3.700% Senior Notes due 2025 309,648 297,225 291,750 296,948 5.75% Senior Notes due 2020 269,265 249,188 270,875 248,941 Series B 7.50% Senior Notes due 2017 — — 257,500 255,352 4.750% Senior Notes due 2025 (DaVinciRe) (1) 158,742 147,653 144,675 147,422 $ 1,034,244 $ 989,245 $ 964,800 $ 948,663 (1) RenaissanceRe owns a noncontrolling economic interest in its joint venture DaVinciRe. Because RenaissanceRe controls a majority of DaVinciRe’s outstanding voting rights, the consolidated financial statements of DaVinciRe are included in the consolidated financial statements of RenaissanceRe. However, RenaissanceRe does not guarantee or provide credit support for DaVinciRe and RenaissanceRe’s financial exposure to DaVinciRe is limited to its investment in DaVinciRe’s shares and counterparty credit risk arising from reinsurance transactions. 3.450% Senior Notes due 2027 of RenaissanceRe Finance On June 29, 2017 , RenaissanceRe Finance issued $300.0 million of its 3.450% Senior Notes due July 1, 2027 , with interest on the notes payable on July 1 and January 1 of each year. The notes are fully and unconditionally guaranteed by RenaissanceRe and may be redeemed by RenaissanceRe Finance prior to maturity, subject to the payment of a “make-whole” premium if the notes are redeemed prior to April 1, 2027 . The notes contain various covenants, including limitations on mergers and consolidations, and restrictions as to the disposition of, and the placing of liens on, stock of designated subsidiaries. The net proceeds from the offering of the notes are to be used for general corporate purposes. Series B 7.50% Senior Notes due 2017 of Platinum Underwriters Finance, Inc. On June 1, 2017, the Company repaid in full at maturity an aggregate principal amount of $250.0 million , plus applicable accrued interest, of its Series B 7.50% Senior Notes due 2017 assumed in connection with the acquisition of Platinum and originally issued by Platinum Underwriters Finance, Inc. Credit Facilities The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below: At September 30, 2017 Issued or Drawn RenaissanceRe Revolving Credit Facility $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 99,168 Uncommitted Standby Letter of Credit Facility with NAB 4,356 Bilateral Letter of Credit Facility with Citibank Europe 192,715 Funds at Lloyd’s Letter of Credit Facilities Renaissance Reinsurance FAL Facility 180,000 Total credit facilities in U.S. dollars $ 476,239 Funds at Lloyd’s Letter of Credit Facilities Specialty Risks FAL Facility £ 10,000 Total credit facilities in British Pounds £ 10,000 Funds at Lloyd’s Letter of Credit Facilities Effective as of May 25, 2017, Renaissance Reinsurance entered into an amendment to its letter of credit facility with Bank of Montreal (“BMO”), Citibank Europe plc, (“CEP”), and ING Bank N.V. (“ING”) as lenders (the “Renaissance Reinsurance FAL Facility”), which provided for the issuance by the lenders of two letters of credit to support business written by Syndicate 1458 with stated amounts of $380.0 million and £90.0 million , respectively. Pursuant to the amendment, the stated amount of the $380.0 million letter of credit was reduced to $180.0 million and the £90.0 million letter of credit was cancelled. In addition, pursuant to the amendment, Renaissance Reinsurance may request that the Renaissance Reinsurance FAL Facility be amended to increase the stated amount of the letter of credit, or issue a new letter or credit denominated in Pounds, in an aggregate amount for all such increases or issuances not to exceed $75.0 million or the equivalent thereof. All other terms and conditions of the Renaissance Reinsurance FAL Facility remained the same.

Noncontrolling Interests

Noncontrolling Interests	9 Months Ended
	Sep. 30, 2017
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Noncontrolling Interests	NONCONTROLLING INTERESTS A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below: September 30, December 31, 2016 Redeemable noncontrolling interest - DaVinciRe $ 812,342 $ 994,458 Redeemable noncontrolling interest - Medici 221,387 181,136 Redeemable noncontrolling interests $ 1,033,729 $ 1,175,594 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations set forth below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Redeemable noncontrolling interest - DaVinciRe $ (195,508 ) $ 30,745 $ (127,167 ) $ 101,997 Redeemable noncontrolling interest - Medici (8,769 ) 4,896 (5,171 ) 8,870 Net (loss) income attributable to redeemable noncontrolling interests $ (204,277 ) $ 35,641 $ (132,338 ) $ 110,867 Redeemable Noncontrolling Interest – DaVinciRe In October 2001, the Company formed DaVinciRe and DaVinci with other equity investors. RenaissanceRe owns a noncontrolling economic interest in DaVinciRe; however, because RenaissanceRe controls a majority of DaVinciRe’s outstanding voting rights, the consolidated financial statements of DaVinciRe are included in the consolidated financial statements of the Company. The portion of DaVinciRe’s earnings owned by third parties is recorded in the consolidated statements of operations as net income attributable to redeemable noncontrolling interests. The Company’s noncontrolling economic ownership in DaVinciRe was 23.5% at September 30, 2017 ( December 31, 2016 - 24.0% ). DaVinciRe shareholders are party to a shareholders agreement which provides DaVinciRe shareholders, excluding RenaissanceRe, with certain redemption rights that enable each shareholder to notify DaVinciRe of such shareholder’s desire for DaVinciRe to repurchase up to half of such shareholder’s initial aggregate number of shares held, subject to certain limitations, such as limiting the aggregate of all share repurchase requests to 25% of DaVinciRe’s capital in any given year and satisfying all applicable regulatory requirements. If total shareholder requests exceed 25% of DaVinciRe’s capital, the number of shares repurchased will be reduced among the requesting shareholders pro-rata, based on the amounts desired to be repurchased. Shareholders desiring to have DaVinci repurchase their shares must notify DaVinciRe before March 1 of each year. The repurchase price will be based on GAAP book value as of the end of the year in which the shareholder notice is given, and the repurchase will be effective as of January 1 of the following year. The repurchase price is generally subject to a true-up for potential development on outstanding loss reserves after settlement of all claims relating to the applicable years. 2016 During January 2016, DaVinciRe redeemed a portion of its outstanding shares from certain existing DaVinciRe shareholders, including RenaissanceRe, while new DaVinciRe shareholders purchased shares in DaVinciRe from RenaissanceRe. The net redemption as a result of these transactions was $100.0 million . In connection with the redemption, DaVinciRe retained a $10.0 million holdback. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 24.0% , effective January 1, 2016. 2017 During January 2017, DaVinciRe redeemed $75.0 million of its outstanding shares from certain existing DaVinciRe shareholders, including RenaissanceRe. In connection with the redemption, DaVinciRe retained a $7.5 million holdback. In addition, RenaissanceRe sold an aggregate of $24.0 million of its shares in DaVinciRe to an existing shareholder and a new shareholder. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 22.6% , effective January 1, 2017. The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time. During July 2017, RenaissanceRe purchased $12.0 million of DaVinciRe’s outstanding shares from an existing third-party shareholder. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 23.5% , effective July 1, 2017. See “Note 16 . Subsequent Events” for additional information related to DaVinciRe share transactions subsequent to September 30, 2017 . The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 1,019,918 $ 953,443 $ 994,458 $ 930,955 Redemption of shares from redeemable noncontrolling interest (12,068 ) (400 ) (78,870 ) (92,204 ) Sale of shares to redeemable noncontrolling interests — — 23,921 43,040 Net (loss) attributable to redeemable noncontrolling interest (195,508 ) 30,745 (127,167 ) 101,997 Ending balance $ 812,342 $ 983,788 $ 812,342 $ 983,788 Redeemable Noncontrolling Interest - RenaissanceRe Medici Fund Ltd. (“Medici”) Medici is an exempted company incorporated under the laws of Bermuda and its objective is to seek to invest substantially all of its assets in various insurance-based investment instruments that have returns primarily tied to property catastrophe risk. RenaissanceRe owns a noncontrolling economic interest in Medici; however, because RenaissanceRe controls all of Medici’s outstanding voting rights, the financial statements of Medici are included in the consolidated financial statements of the Company. The portion of Medici’s earnings owned by third parties is recorded in the consolidated statements of operations as net income attributable to redeemable noncontrolling interests. Any shareholder may redeem all or any portion of its shares as of the last day of any calendar month, upon at least 30 calendar days’ prior irrevocable written notice to Medici. 2016 During 2016, third-party investors subscribed for $79.5 million and redeemed $21.7 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 36.5% , effective December 31, 2016 . 2017 During the nine months ended September 30, 2017 , third-party investors subscribed for $72.7 million and redeemed $27.3 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 31.6% at September 30, 2017 . The Company expects its noncontrolling economic ownership in Medici to fluctuate over time. The activity in redeemable noncontrolling interest – Medici is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 222,165 $ 168,960 $ 181,136 $ 115,009 Redemption of shares from redeemable noncontrolling interest (1,400 ) (14,389 ) (27,310 ) (21,729 ) Sale of shares to redeemable noncontrolling interests 9,391 21,298 72,732 78,615 Net (loss) income attributable to redeemable noncontrolling interest (8,769 ) 4,896 (5,171 ) 8,870 Ending balance $ 221,387 $ 180,765 $ 221,387 $ 180,765

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES Upsilon RFO Effective January 1, 2013, the Company formed and launched Upsilon RFO, a managed joint venture, and a Bermuda domiciled SPI, to provide additional capacity to the worldwide aggregate and per-occurrence retrocessional property catastrophe excess of loss market. The shareholders (other than the Class A shareholder) participate in substantially all of the profits or losses of Upsilon RFO while their shares remain outstanding. The shareholders (other than the Class A shareholder) indemnify Upsilon RFO against losses relating to insurance risk and therefore these shares have been accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance . Upsilon RFO is considered a VIE as it has insufficient equity capital to finance its activities without additional financial support. The Company is the primary beneficiary of Upsilon RFO as it has the power over the activities that most significantly impact the economic performance of Upsilon RFO and has the obligation to absorb expected losses and the right to receive expected benefits that could be significant to Upsilon RFO, in accordance with the accounting guidance. As a result, the Company consolidates Upsilon RFO and all significant inter-company transactions have been eliminated. Other than its equity investment in Upsilon RFO, the Company has not provided financial or other support to Upsilon RFO that it was not contractually required to provide. 2016 During 2016, Upsilon RFO returned $242.5 million of capital to its investors, including $59.8 million to the Company. In addition, during 2016, $166.6 million of Upsilon RFO non-voting preference shares were issued to existing investors therein, including $55.2 million to the Company. At December 31, 2016, the Company’s participation in the risks assumed by Upsilon RFO was 28.8% . 2017 During the nine months ended September 30, 2017 , Upsilon RFO returned $84.3 million of capital to its investors, including $33.0 million to the Company. In addition, during the nine months ended September 30, 2017 , $134.1 million of Upsilon RFO non-voting preference shares were issued to existing investors therein, including $9.5 million to the Company, and an existing third-party investor purchased $7.5 million of Upsilon RFO non-voting preference shares from the Company. At September 30, 2017 , the Company’s participation in the risks assumed by Upsilon RFO was 10.1% . See “Note 16 . Subsequent Events” for additional information related to Upsilon RFO’s non-voting preference shares subsequent to September 30, 2017 . At September 30, 2017 , the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $453.8 million and $453.9 million , respectively ( December 31, 2016 - $193.0 million and $193.0 million , respectively). Mona Lisa Re Ltd. (“Mona Lisa Re”) On March 14, 2013, Mona Lisa Re was licensed as a Bermuda domiciled special purpose insurer to provide reinsurance capacity to subsidiaries of RenaissanceRe, namely Renaissance Reinsurance and DaVinci, through reinsurance agreements which will be collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes to third-party investors. Upon issuance of a series of notes by Mona Lisa Re, all of the proceeds from the issuance were deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance and/or DaVinci underlying such series of notes. The outstanding principal amount of each series of notes generally will be returned to holders of such notes upon the expiration of the risk period underlying such notes, unless an event occurs which causes a loss under the applicable series of notes, in which case the amount returned will be reduced by such noteholder’s pro rata share of such loss, as specified in the applicable governing documents of such notes. In addition, holders of such notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of notes. The Company concluded that Mona Lisa Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. The Company evaluated its relationship with Mona Lisa Re and concluded it does not have a variable interest in Mona Lisa Re. As a result, the financial position and results of operations of Mona Lisa Re are not consolidated by the Company. The Company has not provided financial or other support to Mona Lisa Re that it was not contractually required to provide. At September 30, 2017 , the total assets and total liabilities of Mona Lisa Re were $26.1 million and $26.1 million , respectively ( December 31, 2016 - $184.2 million and $184.2 million , respectively). The only transactions related to Mona Lisa Re that are recorded in the Company’s consolidated financial statements are the ceded reinsurance agreements entered into by Renaissance Reinsurance and DaVinci which are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance. Renaissance Reinsurance and DaVinci have together entered into ceded reinsurance contracts with Mona Lisa Re with gross premiums ceded of $0.2 million and $0.2 million , respectively, during the nine months ended September 30, 2017 ( 2016 - $7.4 million and $5.1 million , respectively). In addition, Renaissance Reinsurance and DaVinci recognized ceded premiums earned related to the ceded reinsurance contracts with Mona Lisa Re of $4.0 million and $2.8 million , respectively, during the nine months ended September 30, 2017 ( 2016 - $5.4 million and $3.7 million , respectively). Fibonacci Re Effective November 7, 2016 , Fibonacci Re, a Bermuda-domiciled SPI, was formed to provide collateralized capacity to Renaissance Reinsurance and its affiliates. Upon issuance of a series of notes by Fibonacci Re, all of the proceeds from the issuance are deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance underlying such series of notes. The outstanding principal amount of each series of notes generally will be returned to holders of such notes upon the expiration of the risk period underlying such notes, unless an event occurs which causes a loss under the applicable series of notes, in which case the amount returned will be reduced by such noteholder’s pro rata share of such loss, as specified in the applicable governing documents of such notes. In addition, holders of such notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of notes. RUM receives an origination and structuring fee in connection with the formation and operation of Fibonacci Re. The Company concluded that Fibonacci Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. The Company evaluated its relationship with Fibonacci Re and concluded it is not the primary beneficiary of Fibonacci Re as it does not have power over the activities that most significantly impact the economic performance of Fibonacci Re. As a result, the Company does not consolidate the financial position or results of operations of Fibonacci Re. The only transactions related to Fibonacci Re that will be recorded in the Company’s consolidated financial statements will be the ceded reinsurance agreements entered into by Renaissance Reinsurance that are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance, and the fair value of the participating notes owned by the Company. Other than its investment in the participating notes of Fibonacci Re, the Company has not provided financial or other support to Fibonacci Re that it was not contractually required to provide. Effective with the risk periods incepting on January 1, 2017 and June 1, 2017, Fibonacci Re raised $140.0 million and $45.0 million , respectively, of capital from third-party investors and the Company, via private placements of participating notes which are listed on the Bermuda Stock Exchange. The fair value of the Company’s investment in the participating notes of Fibonacci Re is included in other investments. Net of third-party investors, the fair value of the Company’s investment in Fibonacci Re was $16.3 million at September 30, 2017 . Renaissance Reinsurance entered into ceded reinsurance contracts with Fibonacci Re with premiums ceded of $9.4 million during the nine months ended September 30, 2017 . In addition, Renaissance Reinsurance recognized ceded premiums earned related to the ceded reinsurance contracts with Fibonacci Re of $6.2 million during the nine months ended September 30, 2017 .

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Dividends The Board of Directors of RenaissanceRe declared dividends of $0.32 per common share to common shareholders of record on March 15, 2017, June 15, 2017 and September 15, 2017, respectively, and RenaissanceRe paid dividends of $0.32 per common share to common shareholders on March 31, 2017, June 30, 2017 and September 29, 2017, respectively. The Board of Directors approved the payment of quarterly dividends on the Series C 6.08% Preference Shares and Series E 5.375% Preference Shares to preference shareholders of record in the amounts and on the quarterly record dates and dividend payment dates set forth in the prospectus supplement and Certificate of Designation for the applicable series of preference shares, unless and until further action is taken by the Board of Directors. The dividend payment dates for the preference shares will be the first day of March, June, September and December of each year (or if this date is not a business day, on the business day immediately following this date). The record dates for the preference share dividends are one day prior to the dividend payment dates. The amount of the dividend on the Series C 6.08% Preference Shares is an amount per share equal to 6.08% of the liquidation preference per annum (the equivalent to $1.52 per share per annum, or $0.38 per share per quarter). The amount of the dividend on the Series E 5.375% Preference Shares is an amount per share equal to 5.375% of the liquidation preference per annum (the equivalent to $1.34375 per share per annum, or $0.3359375 per share per quarter). During the nine months ended September 30, 2017 , the Company paid $16.8 million in preference share dividends ( 2016 - $16.8 million ) and $38.6 million in common share dividends ( 2016 - $38.9 million ). Share Repurchases The Company’s share repurchase program may be effected from time to time, depending on market conditions and other factors, through open market purchases and privately negotiated transactions. On August 2, 2017 , RenaissanceRe’s Board of Directors approved a renewal of its authorized share repurchase program for an aggregate amount of up to $500.0 million . Unless terminated earlier by RenaissanceRe’s Board of Directors, the program will expire when the Company has repurchased the full value of the common shares authorized. The Company’s decision to repurchase common shares will depend on, among other matters, the market price of the common shares and the capital requirements of the Company. During the nine months ended September 30, 2017 , the Company repurchased an aggregate of 1.3 million common shares in open market transactions at an aggregate cost of $188.6 million and an average price of $142.67 per common share. At September 30, 2017 , $467.3 million remained available for repurchase under the share repurchase program.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per common share: Three months ended Nine months ended (common shares in thousands) September 30, September 30, September 30, September 30, Numerator: Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (504,812 ) $ 146,825 $ (241,318 ) $ 411,145 Amount allocated to participating common shareholders (1) (116 ) (1,770 ) (344 ) (4,939 ) Net (loss) income allocated to RenaissanceRe common shareholders $ (504,928 ) $ 145,055 $ (241,662 ) $ 406,206 Denominator: Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares 39,591 40,513 39,979 41,594 Per common share equivalents of employee stock options and restricted shares — 220 — 248 Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 39,591 40,733 39,979 41,842 Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic $ (12.75 ) $ 3.58 $ (6.04 ) $ 9.77 Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted $ (12.75 ) $ 3.56 $ (6.04 ) $ 9.71 (1) Represents earnings attributable to holders of unvested restricted shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2010 Performance-Based Equity Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2017
Segment Reporting, Measurement Disclosures [Abstract]
Segment Reporting	SEGMENT REPORTING The Company’s reportable segments are defined as follows: (1) Property, which is comprised of catastrophe and other property reinsurance and insurance written on behalf of the Company’s operating subsidiaries and certain joint ventures managed by the Company’s ventures unit, and (2) Casualty and Specialty, which is comprised of casualty and specialty reinsurance and insurance written on behalf of the Company’s operating subsidiaries and certain joint ventures managed by the Company’s ventures unit. In addition to its reportable segments, the Company has an Other category, which primarily includes its strategic investments, investments unit, corporate expenses, capital servicing costs, noncontrolling interests, certain expenses related to the acquisition of Platinum, and the remnants of its former Bermuda-based insurance operations. The Company’s Property segment is managed by the Chief Underwriting Officer - Property and the Casualty and Specialty segment is managed by the Chief Underwriting Officer - Casualty and Specialty. Each of the Chief Underwriting Officer - Property and Chief Underwriting Officer - Casualty and Specialty operate under the direction of the Company’s Group Chief Underwriting Officer, who in turn reports to the Company’s President and Chief Executive Officer. The Company does not manage its assets by segment; accordingly, net investment income and total assets are not allocated to the segments. A summary of the significant components of the Company’s revenues and expenses by segment is as follows: Three months ended September 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 325,395 $ 314,881 $ (7 ) $ 640,269 Net premiums written $ 269,393 $ 213,835 $ (7 ) $ 483,221 Net premiums earned $ 336,838 $ 210,961 $ (7 ) $ 547,792 Net claims and claim expenses incurred 1,044,418 177,433 (155 ) 1,221,696 Acquisition expenses 17,514 59,248 (1 ) 76,761 Operational expenses 25,123 17,389 25 42,537 Underwriting (loss) income $ (750,217 ) $ (43,109 ) $ 124 (793,202 ) Net investment income 40,257 40,257 Net foreign exchange losses (156 ) (156 ) Equity in earnings of other ventures 1,794 1,794 Other income 2,996 2,996 Net realized and unrealized gains on investments 42,052 42,052 Corporate expenses (4,413 ) (4,413 ) Interest expense (11,799 ) (11,799 ) Loss before taxes (722,471 ) Income tax benefit 18,977 18,977 Net loss attributable to redeemable noncontrolling interests 204,277 204,277 Dividends on preference shares (5,595 ) (5,595 ) Net loss attributable to RenaissanceRe common shareholders $ (504,812 ) Net claims and claim expenses incurred – current accident year $ 1,036,586 $ 172,675 $ — $ 1,209,261 Net claims and claim expenses incurred – prior accident years 7,832 4,758 (155 ) 12,435 Net claims and claim expenses incurred – total $ 1,044,418 $ 177,433 $ (155 ) $ 1,221,696 Net claims and claim expense ratio – current accident year 307.7 % 81.9 % 220.8 % Net claims and claim expense ratio – prior accident years 2.4 % 2.2 % 2.2 % Net claims and claim expense ratio – calendar year 310.1 % 84.1 % 223.0 % Underwriting expense ratio 12.6 % 36.3 % 21.8 % Combined ratio 322.7 % 120.4 % 244.8 % Nine months ended September 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 1,345,271 $ 1,044,510 $ (7 ) $ 2,389,774 Net premiums written $ 895,728 $ 687,381 $ (7 ) $ 1,583,102 Net premiums earned $ 716,024 $ 580,085 $ (7 ) $ 1,296,102 Net claims and claim expenses incurred 1,116,273 441,801 (710 ) 1,557,364 Acquisition expenses 75,117 173,179 (2 ) 248,294 Operational expenses 76,841 54,708 37 131,586 Underwriting (loss) income $ (552,207 ) $ (89,603 ) $ 668 (641,142 ) Net investment income 148,745 148,745 Net foreign exchange gains 11,118 11,118 Equity in earnings of other ventures 5,830 5,830 Other income 7,053 7,053 Net realized and unrealized gains on investments 143,538 143,538 Corporate expenses (14,335 ) (14,335 ) Interest expense (32,416 ) (32,416 ) Loss before taxes (371,609 ) Income tax benefit 14,739 14,739 Net income attributable to redeemable noncontrolling interests 132,338 132,338 Dividends on preference shares (16,786 ) (16,786 ) Net loss attributable to RenaissanceRe common shareholders $ (241,318 ) Net claims and claim expenses incurred – current accident year $ 1,133,241 $ 427,786 $ — $ 1,561,027 Net claims and claim expenses incurred – prior accident years (16,968 ) 14,015 (710 ) (3,663 ) Net claims and claim expenses incurred – total $ 1,116,273 $ 441,801 $ (710 ) $ 1,557,364 Net claims and claim expense ratio – current accident year 158.3 % 73.7 % 120.4 % Net claims and claim expense ratio – prior accident years (2.4 )% 2.5 % (0.2 )% Net claims and claim expense ratio – calendar year 155.9 % 76.2 % 120.2 % Underwriting expense ratio 21.2 % 39.2 % 29.3 % Combined ratio 177.1 % 115.4 % 149.5 % Three months ended September 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 119,904 $ 310,320 $ — $ 430,224 Net premiums written $ 90,909 $ 193,313 $ — $ 284,222 Net premiums earned $ 172,661 $ 173,860 $ — $ 346,521 Net claims and claim expenses incurred 23,539 89,844 (808 ) 112,575 Acquisition expenses 21,663 58,917 — 80,580 Operational expenses 24,258 16,217 18 40,493 Underwriting income $ 103,201 $ 8,882 $ 790 112,873 Net investment income 51,423 51,423 Net foreign exchange losses (5,986 ) (5,986 ) Equity in losses of other ventures (11,630 ) (11,630 ) Other income 2,268 2,268 Net realized and unrealized gains on investments 59,870 59,870 Corporate expenses (11,537 ) (11,537 ) Interest expense (10,536 ) (10,536 ) Income before taxes and noncontrolling interests 186,745 Income tax benefit 1,316 1,316 Net income attributable to noncontrolling interests (35,641 ) (35,641 ) Dividends on preference shares (5,595 ) (5,595 ) Net income available to RenaissanceRe common shareholders $ 146,825 Net claims and claim expenses incurred – current accident year $ 42,062 $ 116,298 $ — $ 158,360 Net claims and claim expenses incurred – prior accident years (18,523 ) (26,454 ) (808 ) (45,785 ) Net claims and claim expenses incurred – total $ 23,539 $ 89,844 $ (808 ) $ 112,575 Net claims and claim expense ratio – current accident year 24.4 % 66.9 % 45.7 % Net claims and claim expense ratio – prior accident years (10.8 )% (15.2 )% (13.2 )% Net claims and claim expense ratio – calendar year 13.6 % 51.7 % 32.5 % Underwriting expense ratio 26.6 % 43.2 % 34.9 % Combined ratio 40.2 % 94.9 % 67.4 % Nine months ended September 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 1,058,816 $ 992,669 $ — $ 2,051,485 Net premiums written $ 674,361 $ 641,452 $ — $ 1,315,813 Net premiums earned $ 538,953 $ 512,576 $ — $ 1,051,529 Net claims and claim expenses incurred 125,618 282,117 (805 ) 406,930 Acquisition expenses 71,176 144,001 — 215,177 Operational expenses 79,441 68,261 99 147,801 Underwriting income $ 262,718 $ 18,197 $ 706 281,621 Net investment income 134,410 134,410 Net foreign exchange losses (8,368 ) (8,368 ) Equity in losses of other ventures (3,997 ) (3,997 ) Other income 9,001 9,001 Net realized and unrealized gains on investments 191,295 191,295 Corporate expenses (25,514 ) (25,514 ) Interest expense (31,610 ) (31,610 ) Income before taxes and noncontrolling interests 546,838 Income tax expense (8,040 ) (8,040 ) Net income attributable to noncontrolling interests (110,867 ) (110,867 ) Dividends on preference shares (16,786 ) (16,786 ) Net income available to RenaissanceRe common shareholders $ 411,145 Net claims and claim expenses incurred – current accident year $ 163,130 $ 320,444 $ — $ 483,574 Net claims and claim expenses incurred – prior accident years (37,512 ) (38,327 ) (805 ) (76,644 ) Net claims and claim expenses incurred – total $ 125,618 $ 282,117 $ (805 ) $ 406,930 Net claims and claim expense ratio – current accident year 30.3 % 62.5 % 46.0 % Net claims and claim expense ratio – prior accident years (7.0 )% (7.5 )% (7.3 )% Net claims and claim expense ratio – calendar year 23.3 % 55.0 % 38.7 % Underwriting expense ratio 28.0 % 41.4 % 34.5 % Combined ratio 51.3 % 96.4 % 73.2 %

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2017
Summary of Derivative Instruments [Abstract]
Derivative Instruments	DERIVATIVE INSTRUMENTS From time to time, the Company may enter into derivative instruments such as futures, options, swaps, forward contracts and other derivative contracts primarily to manage its foreign currency exposure, obtain exposure to a particular financial market, for yield enhancement, or for trading and speculation. The Company’s derivative instruments are generally traded under International Swaps and Derivatives Association master agreements, which establish the terms of the transactions entered into with the Company’s derivative counterparties. In the event a party becomes insolvent or otherwise defaults on its obligations, a master agreement generally permits the non-defaulting party to accelerate and terminate all outstanding transactions and net the transactions’ marked-to-market values so that a single sum in a single currency will be owed by, or owed to, the non-defaulting party. Effectively, this contractual close-out netting reduces credit exposure from gross to net exposure. Where the Company has entered into master netting agreements with counterparties, or the Company has the legal and contractual right to offset positions, the derivative positions are generally netted by counterparty and are reported accordingly in other assets and other liabilities. The tables below show the gross and net amounts of recognized derivative assets and liabilities at fair value, including the location on the consolidated balance sheets of the Company’s principal derivative instruments: Derivative Assets At September 30, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Balance Sheet Location Collateral Net Amount Interest rate futures $ 740 614 $ 126 Other assets $ — $ 126 Interest rate swaps 551 277 274 Other assets — 274 Foreign currency forward contracts (1) 4,758 557 4,201 Other assets — 4,201 Foreign currency forward contracts (2) 43 14 29 Other assets — 29 Credit default swaps 956 308 648 Other assets — 648 Total $ 7,048 $ 1,770 $ 5,278 $ — $ 5,278 Derivative Liabilities At September 30, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet Balance Sheet Location Collateral Pledged Net Amount Interest rate futures $ 854 614 $ 240 Other liabilities $ 240 $ — Interest rate swaps 280 277 3 Other liabilities 3 — Foreign currency forward contracts (1) 2,996 — 2,996 Other liabilities — 2,996 Foreign currency forward contracts (2) 90 14 76 Other liabilities — 76 Credit default swaps 327 308 19 Other liabilities — 19 Total $ 4,547 $ 1,213 $ 3,334 $ 243 $ 3,091 (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations. Derivative Assets At December 31, 2016 Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Balance Sheet Location Collateral Net Amount Interest rate futures $ 1,384 1,235 $ 149 Other assets $ — $ 149 Foreign currency forward contracts (1) 774 — 774 Other assets — 774 Foreign currency forward contracts (2) 621 447 174 Other assets — 174 Credit default swaps 1,429 23 1,406 Other assets — 1,406 Total $ 4,208 $ 1,705 $ 2,503 $ — $ 2,503 Derivative Liabilities At December 31, 2016 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet Balance Sheet Location Collateral Pledged Net Amount Interest rate futures $ 2,030 1,235 $ 795 Other liabilities $ 789 $ 6 Foreign currency forward contracts (1) 10,550 397 10,153 Other liabilities — 10,153 Foreign currency forward contracts (2) 766 447 319 Other liabilities — 319 Credit default swaps 181 23 158 Other liabilities — 158 Total $ 13,527 $ 2,102 $ 11,425 $ 789 $ 10,636 (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations. Refer to “Note 3 . Investments” for information on reverse repurchase agreements. The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its principal derivative instruments are shown in the following table: Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Three months ended September 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (3,016 ) $ 1,040 Interest rate swaps Net realized and unrealized gains on investments 271 — Foreign currency forward contracts (1) Net foreign exchange (losses) gains 2,056 5,097 Foreign currency forward contracts (2) Net foreign exchange (losses) gains (40 ) (489 ) Credit default swaps Net realized and unrealized gains on investments (1,275 ) 687 Total $ (2,004 ) $ 6,335 Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Nine months ended September 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (4,064 ) $ (27,775 ) Interest rate swaps Net realized and unrealized gains on investments 271 — Foreign currency forward contracts (1) Net foreign exchange (losses) gains 8,339 (92 ) Foreign currency forward contracts (2) Net foreign exchange (losses) gains (940 ) (3,706 ) Credit default swaps Net realized and unrealized gains on investments (551 ) 902 Total $ 3,055 $ (30,671 ) (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations. The Company is not aware of the existence of any credit-risk related contingent features that it believes would be triggered in its derivative instruments that are in a net liability position at September 30, 2017 . Interest Rate Derivatives The Company uses interest rate futures and swaps within its portfolio of fixed maturity investments to manage its exposure to interest rate risk, which may result in increasing or decreasing its exposure to this risk. Interest Rate Futures The fair value of interest rate futures is determined using exchange traded prices. At September 30, 2017 , the Company had $1.1 billion of notional long positions and $399.7 million of notional short positions of primarily Eurodollar, U.S. treasury and non-U.S. dollar futures contracts ( December 31, 2016 - $1.2 billion and $727.9 million , respectively). Interest Rate Swaps During the three months ended September 30, 2017, the Company entered into interest rate swaps. The fair value of interest rate swaps is determined using the relevant exchange traded price where available or a discounted cash flow model based on the terms of the contract and inputs, including, where applicable, observable yield curves. At September 30, 2017 , the Company had $51.3 million of notional positions paying a fixed rate and $5.3 million receiving a fixed rate denominated in U.S. dollars. Foreign Currency Derivatives The Company’s functional currency is the U.S. dollar. The Company writes a portion of its business in currencies other than U.S. dollars and may, from time to time, experience foreign exchange gains and losses in the Company’s consolidated financial statements. All changes in exchange rates, with the exception of non-monetary assets and liabilities, are recognized in the Company’s consolidated statements of operations. Underwriting Operations Related Foreign Currency Contracts The Company’s foreign currency policy with regard to its underwriting operations is generally to hold foreign currency assets, including cash, investments and receivables that approximate the foreign currency liabilities, including claims and claim expense reserves and reinsurance balances payable. When necessary, the Company may use foreign currency forward and option contracts to minimize the effect of fluctuating foreign currencies on the value of non-U.S. dollar denominated assets and liabilities associated with its underwriting operations. The fair value of the Company’s underwriting operations related foreign currency contracts is determined using indicative pricing obtained from counterparties or broker quotes. At September 30, 2017 , the Company had outstanding underwriting related foreign currency contracts of $191.1 million in notional long positions and $68.5 million in notional short positions, denominated in U.S. dollars ( December 31, 2016 - $184.2 million and $91.4 million , respectively). Investment Portfolio Related Foreign Currency Forward Contracts The Company’s investment operations are exposed to currency fluctuations through its investments in non-U.S. dollar fixed maturity investments, short term investments and other investments. From time to time, the Company may employ foreign currency forward contracts in its investment portfolio to either assume foreign currency risk or to economically hedge its exposure to currency fluctuations from these investments. The fair value of the Company’s investment portfolio related foreign currency forward contracts is determined using an interpolated rate based on closing forward market rates. At September 30, 2017 , the Company had outstanding investment portfolio related foreign currency contracts of $17.6 million in notional long positions and $4.5 million in notional short positions, denominated in U.S. dollars ( December 31, 2016 - $26.9 million and $57.3 million , respectively). Credit Derivatives The Company’s exposure to credit risk is primarily due to its fixed maturity investments, short term investments, premiums receivable and reinsurance recoverable. From time to time, the Company purchases credit derivatives to hedge its exposures in the insurance industry, and to assist in managing the credit risk associated with ceded reinsurance. The Company also employs credit derivatives in its investment portfolio to either assume credit risk or hedge its credit exposure. The fair value of credit derivatives is determined using industry valuation models, broker bid indications or internal pricing valuation techniques. The fair value of these credit derivatives can change based on a variety of factors including changes in credit spreads, default rates and recovery rates, the correlation of credit risk between the referenced credit and the counterparty, and market rate inputs such as interest rates. At September 30, 2017 , the Company had outstanding credit derivatives of $15.5 million in notional positions to hedge credit risk and $13.3 million in notional positions to assume credit risk, denominated in U.S. dollars ( December 31, 2016 - $Nil and $75.2 million , respectively).

Commitments, Contingencies and

Commitments, Contingencies and Other Items	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Other Items	COMMITMENTS, CONTINGENCIES AND OTHER ITEMS There are no material changes from the commitments and contingencies previously disclosed in the Company’s Form 10-K for the year ended December 31, 2016 . Legal Proceedings The Company and its subsidiaries are subject to lawsuits and regulatory actions in the normal course of business that do not arise from or directly relate to claims on reinsurance treaties or contracts or direct surplus lines insurance policies. In the Company’s industry, business litigation may involve allegations of underwriting or claims-handling errors or misconduct, disputes relating to the scope of, or compliance with, the terms of delegated underwriting agreements, employment claims, regulatory actions or disputes arising from the Company’s business ventures. The Company’s operating subsidiaries are subject to claims litigation involving, among other things, disputed interpretations of policy coverages. Generally, the Company’s direct surplus lines insurance operations are subject to greater frequency and diversity of claims and claims-related litigation than its reinsurance operations and, in some jurisdictions, may be subject to direct actions by allegedly injured persons or entities seeking damages from policyholders. These lawsuits, involving or arising out of claims on policies issued by the Company’s subsidiaries which are typical to the insurance industry in general and in the normal course of business, are considered in its loss and loss expense reserves. In addition, the Company may from time to time engage in litigation or arbitration related to its claims for payment in respect of ceded reinsurance, including disputes that challenge the Company’s ability to enforce its underwriting intent. Such matters could result, directly or indirectly, in providers of protection not meeting their obligations to the Company or not doing so on a timely basis. The Company may also be subject to other disputes from time to time, relating to operational or other matters distinct from insurance or reinsurance claims. Any litigation or arbitration, or regulatory process, contains an element of uncertainty, and the value of an exposure or a gain contingency related to a dispute is difficult to estimate accordingly. Currently, the Company believes that no individual litigation or arbitration to which it is presently a party is likely to have a material adverse effect on its financial condition, business or operations.

Condensed Consolidating Financi

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries	9 Months Ended
	Sep. 30, 2017
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries	CONDENSED CONSOLIDATING FINANCIAL INFORMATION PROVIDED IN CONNECTION WITH OUTSTANDING DEBT OF SUBSIDIARIES The following tables present condensed consolidating balance sheets at September 30, 2017 and December 31, 2016 , condensed consolidating statements of operations and condensed consolidating statements of comprehensive (loss) income for the three and nine months ended September 30, 2017 and 2016 , and condensed consolidating statements of cash flows for the nine months ended September 30, 2017 . Each of RenRe North America Holdings Inc., Platinum Underwriters Finance, Inc. and RenaissanceRe Finance is a 100% owned subsidiary of RenaissanceRe. For additional information related to the terms of the Company’s outstanding debt securities, see “Note 9. Debt and Credit Facilities” in the “Notes to Consolidated Financial Statements” in the Company’s Form 10-K for the year ended December 31, 2016 and “Note 7 . Debt and Credit Facilities” in the “Notes to Consolidated Financial Statements” included herein. Condensed Consolidating Balance Sheet at September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 193,268 $ 130,802 $ — $ 35,098 $ 9,283,010 $ — $ 9,642,178 Cash and cash equivalents 12,370 226 10 7,663 561,307 — 581,576 Investments in subsidiaries 3,968,721 37,834 — 1,152,247 — (5,158,802 ) — Due from subsidiaries and affiliates 107,746 91,891 — — — (199,637 ) — Premiums receivable — — — — 1,521,266 — 1,521,266 Prepaid reinsurance premiums — — — — 635,756 — 635,756 Reinsurance recoverable — — — — 1,588,304 — 1,588,304 Accrued investment income 125 197 — 59 37,985 — 38,366 Deferred acquisition costs — — — — 434,914 — 434,914 Receivable for investments sold 9,042 13,472 — 101 171,143 — 193,758 Other assets 429,594 36,825 — 435,815 98,023 (836,238 ) 164,019 Goodwill and other intangible assets 126,246 — — — 118,541 — 244,787 Total assets $ 4,847,112 $ 311,247 $ 10 $ 1,630,983 $ 14,450,249 $ (6,194,677 ) $ 15,044,924 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 5,192,313 $ — $ 5,192,313 Unearned premiums — — — — 1,713,069 — 1,713,069 Debt 417,000 — — 841,592 147,653 (417,000 ) 989,245 Amounts due to subsidiaries and affiliates 2,950 55 — 97,365 — (100,370 ) — Reinsurance balances payable — — — — 1,034,454 — 1,034,454 Payable for investments purchased 8,989 17,938 — — 350,616 — 377,543 Other liabilities 15,161 927 — 9,926 282,647 (7,102 ) 301,559 Total liabilities 444,100 18,920 — 948,883 8,720,752 (524,472 ) 9,608,183 Redeemable noncontrolling interests — — — — 1,033,729 — 1,033,729 Shareholders’ Equity Total shareholders’ equity 4,403,012 292,327 10 682,100 4,695,768 (5,670,205 ) 4,403,012 Total liabilities, noncontrolling interests and shareholders’ equity $ 4,847,112 $ 311,247 $ 10 $ 1,630,983 $ 14,450,249 $ (6,194,677 ) $ 15,044,924 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Balance Sheet at December 31, 2016 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 387,274 $ 119,163 $ 267,556 $ 45,027 $ 8,497,948 $ — $ 9,316,968 Cash and cash equivalents 7,067 162 6,671 9,397 397,860 — 421,157 Investments in subsidiaries 4,074,769 34,761 843,089 1,165,413 — (6,118,032 ) — Due from subsidiaries and affiliates 7,413 91,892 — — — (99,305 ) — Premiums receivable — — — — 987,323 — 987,323 Prepaid reinsurance premiums — — — — 441,260 — 441,260 Reinsurance recoverable — — — — 279,564 — 279,564 Accrued investment income 105 289 551 106 37,025 — 38,076 Deferred acquisition costs — — — — 335,325 — 335,325 Receivable for investments sold 136 2 99 45 105,559 — 105,841 Other assets 410,757 37,204 4,689 127,572 118,098 (522,938 ) 175,382 Goodwill and other intangible assets 130,407 — — — 120,779 — 251,186 Total assets $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,848,294 $ — $ 2,848,294 Unearned premiums — — — — 1,231,573 — 1,231,573 Debt 117,000 — 255,352 545,889 147,422 (117,000 ) 948,663 Amounts due to subsidiaries and affiliates 14,644 42 123 96,061 — (110,870 ) — Reinsurance balances payable — — — — 673,983 — 673,983 Payable for investments purchased — — — — 305,714 — 305,714 Other liabilities 19,707 10,544 — 13,350 270,610 (12,527 ) 301,684 Total liabilities 151,351 10,586 255,475 655,300 5,477,596 (240,397 ) 6,309,911 Redeemable noncontrolling interests — — — — 1,175,594 — 1,175,594 Shareholders’ Equity Total shareholders’ equity 4,866,577 272,887 867,180 692,260 4,667,551 (6,499,878 ) 4,866,577 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 547,792 $ — $ 547,792 Net investment income (loss) 5,725 544 (3 ) 1,335 39,342 (6,686 ) 40,257 Net foreign exchange losses — — — — (156 ) — (156 ) Equity in earnings of other ventures — — — 38 1,756 — 1,794 Other income 1 — — — 2,995 — 2,996 Net realized and unrealized gains on investments 110 2,186 — 51 39,705 — 42,052 Total revenues 5,836 2,730 (3 ) 1,424 631,434 (6,686 ) 634,735 Expenses Net claims and claim expenses incurred — — — — 1,221,696 — 1,221,696 Acquisition expenses — — — — 76,761 — 76,761 Operational expenses 2,910 17 1 6,266 37,752 (4,409 ) 42,537 Corporate expenses 4,634 — — — (221 ) — 4,413 Interest expense 183 — — 9,258 2,541 (183 ) 11,799 Total expenses 7,727 17 1 15,524 1,338,529 (4,592 ) 1,357,206 (Loss) income before equity in net (loss) income of subsidiaries and taxes (1,891 ) 2,713 (4 ) (14,100 ) (707,095 ) (2,094 ) (722,471 ) (Loss) equity in net (loss) income of subsidiaries (499,408 ) 928 — (16,352 ) — 514,832 — (Loss) Income before taxes (501,299 ) 3,641 (4 ) (30,452 ) (707,095 ) 512,738 (722,471 ) Income tax benefit (expense) 2,082 (890 ) 29 3,307 14,449 — 18,977 Net (loss) income (499,217 ) 2,751 25 (27,145 ) (692,646 ) 512,738 (703,494 ) Net loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Net (loss) income attributable to RenaissanceRe (499,217 ) 2,751 25 (27,145 ) (488,369 ) 512,738 (499,217 ) Dividends on preference shares (5,595 ) — — — — — (5,595 ) Net (loss) income (attributable) available attributable to RenaissanceRe common shareholders $ (504,812 ) $ 2,751 $ 25 $ (27,145 ) $ (488,369 ) $ 512,738 $ (504,812 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive (Loss) Income for the three months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive (loss) income Net (loss) income $ (499,217 ) $ 2,751 $ 25 $ (27,145 ) $ (692,646 ) $ 512,738 $ (703,494 ) Change in net unrealized gains on investments — — — — 300 — 300 Comprehensive (loss) income (499,217 ) 2,751 25 (27,145 ) (692,346 ) 512,738 (703,194 ) Net loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Comprehensive loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Comprehensive (loss) income attributable to RenaissanceRe $ (499,217 ) $ 2,751 $ 25 $ (27,145 ) $ (488,069 ) $ 512,738 $ (498,917 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 1,296,102 $ — $ 1,296,102 Net investment income 16,466 1,436 1,373 1,843 146,816 (19,189 ) 148,745 Net foreign exchange (losses) gains (1 ) — — — 11,119 — 11,118 Equity in (losses) earnings of other ventures — — — (412 ) 6,242 — 5,830 Other income — — — — 7,053 — 7,053 Net realized and unrealized gains (losses) on investments 155 6,528 4,916 (217 ) 132,156 — 143,538 Total revenues 16,620 7,964 6,289 1,214 1,599,488 (19,189 ) 1,612,386 Expenses Net claims and claim expenses incurred — — — — 1,557,364 — 1,557,364 Acquisition expenses — — — — 248,294 — 248,294 Operational expenses 9,398 57 86 20,892 116,212 (15,059 ) 131,586 Corporate expenses 14,640 — — — (305 ) — 14,335 Interest expense 464 — 2,461 22,401 7,554 (464 ) 32,416 Total expenses 24,502 57 2,547 43,293 1,929,119 (15,523 ) 1,983,995 (Loss) income before equity in net (loss) income of subsidiaries and taxes (7,882 ) 7,907 3,742 (42,079 ) (329,631 ) (3,666 ) (371,609 ) Equity in net (loss) income of subsidiaries (219,309 ) 3,234 28,028 20,584 — 167,463 — (Loss) Income before taxes (227,191 ) 11,141 31,770 (21,495 ) (329,631 ) 163,797 (371,609 ) Income tax benefit (expense) 2,659 (2,572 ) (1,175 ) 9,281 6,546 — 14,739 Net (loss) income (224,532 ) 8,569 30,595 (12,214 ) (323,085 ) 163,797 (356,870 ) Net loss attributable to redeemable noncontrolling interests — — — — 132,338 — 132,338 Net (loss) income attributable to RenaissanceRe (224,532 ) 8,569 30,595 (12,214 ) (190,747 ) 163,797 (224,532 ) Dividends on preference shares (16,786 ) — — — — — (16,786 ) Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (241,318 ) $ 8,569 $ 30,595 $ (12,214 ) $ (190,747 ) $ 163,797 $ (241,318 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive (Loss) Income for the nine months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive (loss) income Net (loss) income $ (224,532 ) $ 8,569 $ 30,595 $ (12,214 ) $ (323,085 ) $ 163,797 $ (356,870 ) Change in net unrealized gains on investments — — — — (972 ) — (972 ) Comprehensive (loss) income (224,532 ) 8,569 30,595 (12,214 ) (324,057 ) 163,797 (357,842 ) Net loss attributable to redeemable noncontrolling interests — — — — 132,338 — 132,338 Comprehensive loss attributable to noncontrolling interests — — — — 132,338 — 132,338 Comprehensive (loss) income attributable to RenaissanceRe $ (224,532 ) $ 8,569 $ 30,595 $ (12,214 ) $ (191,719 ) $ 163,797 $ (225,504 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 346,521 $ — $ 346,521 Net investment income 5,892 441 795 140 50,406 (6,251 ) 51,423 Net foreign exchange losses — — — — (5,986 ) — (5,986 ) Equity in losses of other ventures — — — — (11,630 ) — (11,630 ) Other income 21 — — — 2,247 — 2,268 Net realized and unrealized (losses) gains on investments (336 ) 1,397 2,105 — 56,704 — 59,870 Total revenues 5,577 1,838 2,900 140 438,262 (6,251 ) 442,466 Expenses Net claims and claim expenses incurred — — — — 112,575 — 112,575 Acquisition expenses — — — — 80,580 — 80,580 Operational expenses (1,233 ) 36 60 5,021 40,018 (3,409 ) 40,493 Corporate expenses 11,617 — — — (80 ) — 11,537 Interest expense 140 — 1,476 6,545 2,515 (140 ) 10,536 Total expenses 10,524 36 1,536 11,566 235,608 (3,549 ) 255,721 Income (loss) before equity in net income of subsidiaries and taxes (4,947 ) 1,802 1,364 (11,426 ) 202,654 (2,702 ) 186,745 Equity in net income of subsidiaries 158,862 1,463 (2,694 ) 1,130 — (158,761 ) — Income (loss) before taxes 153,915 3,265 (1,330 ) (10,296 ) 202,654 (161,463 ) 186,745 Income tax (expense) benefit (1,495 ) (324 ) (401 ) 2,785 751 — 1,316 Net income (loss) 152,420 2,941 (1,731 ) (7,511 ) 203,405 (161,463 ) 188,061 Net income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Net income (loss) attributable to RenaissanceRe 152,420 2,941 (1,731 ) (7,511 ) 167,764 (161,463 ) 152,420 Dividends on preference shares (5,595 ) — — — — — (5,595 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 146,825 $ 2,941 $ (1,731 ) $ (7,511 ) $ 167,764 $ (161,463 ) $ 146,825 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended September 30, 2016 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 152,420 $ 2,941 $ (1,731 ) $ (7,511 ) $ 203,405 $ (161,463 ) $ 188,061 Change in net unrealized gains on investments — — — — 284 — 284 Comprehensive income (loss) 152,420 2,941 (1,731 ) (7,511 ) 203,689 (161,463 ) 188,345 Net income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Comprehensive income (loss) attributable to RenaissanceRe $ 152,420 $ 2,941 $ (1,731 ) $ (7,511 ) $ 168,048 $ (161,463 ) $ 152,704 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 1,051,529 $ — $ 1,051,529 Net investment income 18,499 1,395 3,074 421 129,038 (18,017 ) 134,410 Net foreign exchange losses (2 ) — — — (8,366 ) — (8,368 ) Equity in losses of other ventures — — — — (3,997 ) — (3,997 ) Other (loss) income (770 ) — — — 9,771 — 9,001 Net realized and unrealized gains on investments 4,951 3,651 7,483 — 175,210 — 191,295 Total revenues 22,678 5,046 10,557 421 1,353,185 (18,017 ) 1,373,870 Expenses Net claims and claim expenses incurred — — — — 406,930 — 406,930 Acquisition expenses — — — — 215,177 — 215,177 Operational expenses (3,038 ) (61 ) 176 16,603 145,466 (11,345 ) 147,801 Corporate expenses 22,411 203 — 7 2,893 — 25,514 Interest expense 421 — 4,429 19,632 7,549 (421 ) 31,610 Total expenses 19,794 142 4,605 36,242 778,015 (11,766 ) 827,032 Income before equity in net income of subsidiaries and taxes 2,884 4,904 5,952 (35,821 ) 575,170 (6,251 ) 546,838 Equity in net income of subsidiaries 424,077 2,996 31,727 42,774 — (501,574 ) — Income before taxes 426,961 7,900 37,679 6,953 575,170 (507,825 ) 546,838 Income tax benefit (expense) 970 (1,791 ) (1,583 ) 8,456 (14,092 ) — (8,040 ) Net income 427,931 6,109 36,096 15,409 561,078 (507,825 ) 538,798 Net income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Net income attributable to RenaissanceRe 427,931 6,109 36,096 15,409 450,211 (507,825 ) 427,931 Dividends on preference shares (16,786 ) — — — — — (16,786 ) Net income available to RenaissanceRe common shareholders $ 411,145 $ 6,109 $ 36,096 $ 15,409 $ 450,211 $ (507,825 ) $ 411,145 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 427,931 $ 6,109 $ 36,096 $ 15,409 $ 561,078 $ (507,825 ) $ 538,798 Change in net unrealized gains on investments — — — — 513 — 513 Comprehensive income 427,931 6,109 36,096 15,409 561,591 (507,825 ) 539,311 Net income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Comprehensive income available to RenaissanceRe $ 427,931 $ 6,109 $ 36,096 $ 15,409 $ 450,724 $ (507,825 ) $ 428,444 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (6,870 ) $ (8,209 ) $ (2,262 ) $ (343,093 ) $ 982,136 $ 621,702 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 106,761 74,455 289,741 279,830 6,912,215 7,663,002 Purchases of fixed maturity investments trading (118,402 ) (69,168 ) (143,991 ) (270,785 ) (7,195,939 ) (7,798,285 ) Net (purchases) sales of equity investments trading — (1,708 ) 85,324 — (22,045 ) 61,571 Net sales (purchases) of short term investments 205,864 (4,495 ) 41,299 (305 ) (388,689 ) (146,326 ) Net sales of other investments — — — — 5,181 5,181 Dividends and return of capital from subsidiaries 285,515 9,175 — 41,866 (336,556 ) — Contributions to subsidiaries (500,000 ) — (26,649 ) (9,175 ) 535,824 — Due to (from) subsidiary 290,130 14 (123 ) 4,062 (294,083 ) — Net cash provided by (used in) investing activities 269,868 8,273 245,601 45,493 (784,092 ) (214,857 ) Cash flows (used in) provided by financing activities Dividends paid – RenaissanceRe common shares (38,624 ) — — — — (38,624 ) Dividends paid – preference shares (16,786 ) — — — — (16,786 ) RenaissanceRe common share repurchases (188,591 ) — — — — (188,591 ) Issuance of debt, net of expenses — — — 295,866 — 295,866 Repayment of debt — — (250,000 ) — — (250,000 ) Net third party redeemable noncontrolling interest share transactions — — — — (44,193 ) (44,193 ) Taxes paid on withholding shares (13,694 ) — — — — (13,694 ) Net cash (used in) provided by financing activities (257,695 ) — (250,000 ) 295,866 (44,193 ) (256,022 ) Effect of exchange rate changes on foreign currency cash — — — — 9,596 9,596 Net increase (decrease) in cash and cash equivalents 5,303 64 (6,661 ) (1,734 ) 163,447 160,419 Cash and cash equivalents, beginning of period 7,067 162 6,671 9,397 397,860 421,157 Cash and cash equivalents, end of period $ 12,370 $ 226 $ 10 $ 7,663 $ 561,307 $ 581,576 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (7,644 ) $ 1,847 $ (11,062 ) $ (35,171 ) $ 432,395 $ 380,365 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 272,710 62,959 113,947 — 6,059,403 6,509,019 Purchases of fixed maturity investments trading (336,345 ) (115,849 ) (259,165 ) — (6,033,479 ) (6,744,838 ) Proceeds from sales and maturities of fixed maturity investments available for sale — — — — 5,931 5,931 Net (purchases) sales of equity investments trading — (2,392 ) 192,911 — (7,407 ) 183,112 Net sales (purchases) of short term investments 122,656 67,986 (41,881 ) — (19,892 ) 128,869 Net purchases of other investments — — — — (56,765 ) (56,765 ) Net sales of other assets — — — — 400 400 Dividends and return of capital from subsidiaries 408,189 2,900 — 9,300 (420,389 ) — Contributions to subsidiaries (91,001 ) — — — 91,001 — Due to (from) subsidiaries (3,497 ) (22,502 ) (108 ) 27,724 (1,617 ) — Net cash provided by (used in) investing activities 372,712 (6,898 ) 5,704 37,024 (382,814 ) 25,728 Cash flows used in financing activities Dividends paid – RenaissanceRe common shares (38,886 ) — — — — (38,886 ) Dividends paid – preference shares (16,786 ) — — — — (16,786 ) RenaissanceRe common share repurchases (309,434 ) — — — — (309,434 ) Net third party redeemable noncontrolling interest share transactions — — — — (45,496 ) (45,496 ) Taxes paid on withholding shares — — — — (10,362 ) (10,362 ) Net cash used in financing activities (365,106 ) — — — (55,858 ) (420,964 ) Effect of exchange rate changes on foreign currency cash — — — — 1,316 1,316 Net (decrease) increase in cash and cash equivalents (38 ) (5,051 ) (5,358 ) 1,853 (4,961 ) (13,555 ) Cash and cash equivalents, beginning of period 10,185 5,908 7,103 677 483,012 506,885 Cash and cash equivalents, end of period $ 10,147 $ 857 $ 1,745 $ 2,530 $ 478,051 $ 493,330 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Effective October 1, 2017, DaVinciRe completed an equity capital raise of $248.6 million from third-party investors and RenaissanceRe. In addition, RenaissanceRe sold an aggregate of $49.7 million of its shares in DaVinciRe to third-party shareholders. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 22.1% , effective October 1, 2017. The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time. Effective October 1, 2017, Upsilon RFO issued $46.5 million of non-voting preference shares to investors, including $17.7 million to the Company. Effective October 1, 2017, the Company’s participation in the risks assumed by Upsilon RFO was 16.0% . Commencing in early October 2017, devastating wildfires impacted many areas of the state of California (the “California Wildfires”). Based on the Company’s initial assessment of the California Wildfires, it is anticipated that the impact on the Company’s financial results will be significant and could be material. In addition, it is possible that the Company will be impacted by other events that have occurred thus far in the fourth quarter. The Company’s assessment of the impact from the California Wildfires and such other events, which remains at a very preliminary stage, is based on, among other things, initial industry insured loss estimates, market share analysis, the application of its modeling techniques, a review of its in-force contracts and potential uncertainties relating to reinsurance recoveries. It is difficult at this time to provide an accurate estimate of the financial impact of these events, including as a result of the preliminary nature of the information available, the preliminary nature of the information provided thus far by industry participants, the magnitude and recent occurrence of the events, and other factors.

Significant Accounting Polici24

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation	BASIS OF PRESENTATION These consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the United States (“GAAP”) for interim financial information and in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete consolidated financial statements. In the opinion of management, these unaudited consolidated financial statements reflect all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position and results of operations as at the end of and for the periods presented. All significant intercompany accounts and transactions have been eliminated from these statements. Certain comparative information has been reclassified to conform to the current presentation. Because of the seasonality of the Company’s business, the results of operations and cash flows for any interim period will not necessarily be indicative of the results of operations and cash flows for the full fiscal year or subsequent quarters.
Use of Estimates in Financial Statements	USE OF ESTIMATES IN FINANCIAL STATEMENTS The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported and disclosed amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ materially from those estimates. The major estimates reflected in the Company’s consolidated financial statements include, but are not limited to, the reserve for claims and claim expenses; reinsurance recoverables, including allowances for reinsurance recoverables deemed uncollectible; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges; and the Company’s deferred tax valuation allowance.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 was issued to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and the classification of taxes paid on the statements of cash flows. ASU 2016-09 became effective for the Company in annual and interim periods beginning after December 15, 2016. The cumulative effect of the adoption of ASU 2016-09 was a $2.2 million increase to opening retained earnings as of January 1, 2017. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED Revenue from Contracts with Customers In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 provides comprehensive guidance on the recognition of revenue from customers arising from the transfer of goods and services. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also provides guidance on accounting for certain contract costs and will also require new disclosures. ASU 2014-09 was to be effective for public business entities in annual and interim periods beginning after December 15, 2016, however in July 2015, the FASB decided to defer by one year the effective dates of ASU 2014-09, and as a result, ASU 2014-09 will be effective for public business entities in annual and interim periods beginning after December 15, 2017. Early adoption is permitted. ASU 2014-09 notably excludes the accounting for insurance contracts, leases, financial instruments and guarantees. The Company is currently evaluating the impact of this guidance, with its implementation efforts primarily focused on other income (loss) on its consolidated statements of operations. The adoption of ASU 2014-09 is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Leases In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 requires lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous guidance. ASU 2016-02 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early application is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”). ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting or those that result in the consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income, simplifies the impairment assessment of equity investments without readily determinable values by requiring a qualitative assessment to identify impairment, eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value for financial instruments measured at amortized cost, requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, requires separate presentation in other comprehensive income of the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the organization has elected to measure the liabilities in accordance with the fair value option, requires the separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and clarifies that the reporting organization should evaluate the need for a valuation allowance on a deferred tax asset related to available for sale securities in combination with the organization’s other deferred tax assets. ASU 2016-01 is effective for public business entities in annual and interim periods beginning after December 15, 2017. Earlier adoption is generally not permitted, except for certain specific provisions of ASU 2016-01. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 modifies the recognition of credit losses by replacing the incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. ASU 2016-13 is applicable to financial assets such as loans, debt securities, trade receivables, off-balance sheet credit exposures, reinsurance receivables, and other financial assets that have the contractual right to receive cash. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. The Company's invested assets are measured at fair value through net income, and therefore those invested assets would not be impacted by the adoption of ASU 2016-13. The Company has other financial assets, such as reinsurance recoverables, that could be impacted by the adoption of ASU 2016-13. ASU 2016-13 is effective for public business entities that are SEC filers for annual and interim periods beginning after December 15, 2019. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU No. 2016-15, Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”). ASU 2016-15 clarifies the classification of receipts and payments in the statement of cash flows. ASU 2016-15 provides guidance related to (1) settlement and payment of zero coupon debt instruments, (2) contingent consideration, (3) proceeds from settlement of insurance claims, (4) proceeds from settlement of corporate and bank owned life insurance policies, (5) distributions from equity method investees, (6) cash receipts from beneficial interests obtained by a transferor, and (7) general guidelines for cash receipts and payments that have more than one aspect of classification. ASU 2016-15 is effective for public business entities for annual periods beginning after December 15, 2018, and interim periods within annual periods beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of cash flows. Intra-Entity Transfers of Assets Other Than Inventory In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory (“ASU 2016-16”). ASU 2016-16 requires entities to recognize the income tax consequences of intra-entity transfers of assets other than inventory when the transfers occur; this is a change from current guidance which prohibits the recognition of current and deferred income taxes until the underlying assets have been sold to outside entities. ASU 2016-16 is effective for public business entities for annual and interim periods beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). Among other things, ASU 2017-04 requires the following: (1) the elimination of step 2 of the goodwill impairment test; entities will no longer utilize the implied fair value of their assets and liabilities for purposes of testing goodwill for impairment, (2) the quantitative portion of the goodwill impairment test will be performed by comparing the fair value of a reporting unit with its carrying amount; an impairment charge is to be recognized for the excess of carrying amount over fair value, but only to the extent of the amount of goodwill allocated to that reporting unit, and (3) foreign currency translation adjustments are not to be allocated to a reporting unit from an entity’s accumulated other comprehensive income; the reporting unit’s carrying amount should include only the currently translated balances of the assets and liabilities assigned to the reporting unit. ASU 2017-04 is effective for public business entities that are SEC filers for annual periods, or any interim goodwill impairment tests in annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact of this guidance; however, it is not expected to have a material impact on the Company’s consolidated statements of operations and financial position.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2017
Investments [Abstract]
Schedule of Fair Value of Fixed Maturity Investments Trading	The following table summarizes the fair value of fixed maturity investments trading: September 30, December 31, U.S. treasuries $ 2,956,952 $ 2,617,894 Agencies 41,109 90,972 Municipal 521,220 519,069 Non-U.S. government (Sovereign debt) 177,855 333,224 Non-U.S. government-backed corporate 121,892 133,300 Corporate 2,028,750 1,877,243 Agency mortgage-backed 499,310 462,493 Non-agency mortgage-backed 299,530 258,944 Commercial mortgage-backed 263,029 409,747 Asset-backed 183,322 188,358 Total fixed maturity investments trading $ 7,092,969 $ 6,891,244
Schedule of Contractual Maturities of Fixed Maturity Investments	Contractual maturities of fixed maturity investments trading are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2017 Amortized Cost Fair Value Due in less than one year $ 366,988 $ 367,091 Due after one through five years 4,326,788 4,324,948 Due after five through ten years 985,535 1,001,975 Due after ten years 151,964 153,764 Mortgage-backed 1,047,676 1,061,869 Asset-backed 182,536 183,322 Total $ 7,061,487 $ 7,092,969
Schedule of Fair Value of Equity Investments Trading	The following table summarizes the fair value of equity investments trading: September 30, December 31, Financials $ 275,373 $ 275,065 Communications and technology 45,592 36,770 Industrial, utilities and energy 32,922 30,303 Consumer 22,613 20,501 Healthcare 21,113 17,245 Basic materials 4,422 3,429 Total $ 402,035 $ 383,313
Schedule of Net Investment Income	The components of net investment income are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Fixed maturity investments $ 45,305 $ 39,959 $ 133,080 $ 122,056 Short term investments 2,771 1,174 7,476 3,401 Equity investments 930 797 2,630 3,325 Other investments Private equity investments 6,371 4,572 20,784 (430 ) Other (11,491 ) 8,765 (4,520 ) 17,109 Cash and cash equivalents 352 246 836 584 44,238 55,513 160,286 146,045 Investment expenses (3,981 ) (4,090 ) (11,541 ) (11,635 ) Net investment income $ 40,257 $ 51,423 $ 148,745 $ 134,410
Schedule of Net Realized and Unrealized Gains On Investments	Net realized and unrealized gains on investments are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Gross realized gains $ 16,343 $ 20,383 $ 43,053 $ 60,794 Gross realized losses (6,126 ) (3,363 ) (29,902 ) (25,832 ) Net realized gains on fixed maturity investments 10,217 17,020 13,151 34,962 Net unrealized gains (losses) on fixed maturity investments trading 5,545 (4,235 ) 48,940 125,501 Net realized and unrealized (losses) gains on investments-related derivatives (4,020 ) 1,727 (4,344 ) (26,873 ) Net realized gains on equity investments trading 13,675 127 49,736 14,038 Net unrealized gains (losses) on equity investments trading 16,635 45,231 36,055 43,667 Net realized and unrealized gains on investments $ 42,052 $ 59,870 $ 143,538 $ 191,295

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets: At September 30, 2017 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,956,952 $ 2,956,952 $ — $ — Agencies 41,109 — 41,109 — Municipal 521,220 — 521,220 — Non-U.S. government (Sovereign debt) 177,855 — 177,855 — Non-U.S. government-backed corporate 121,892 — 121,892 — Corporate 2,028,750 — 2,028,750 — Agency mortgage-backed 499,310 — 499,310 — Non-agency mortgage-backed 299,530 — 299,530 — Commercial mortgage-backed 263,029 — 263,029 — Asset-backed 183,322 — 183,322 — Total fixed maturity investments 7,092,969 2,956,952 4,136,017 — Short term investments 1,497,262 — 1,497,262 — Equity investments trading 402,035 402,035 — — Other investments Catastrophe bonds 332,044 — 332,044 — Private equity partnerships (1) 196,280 — — — Senior secured bank loan funds (1) 19,572 — — — Hedge funds (1) 596 — — — Total other investments 548,492 — 332,044 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (3,493 ) — — (3,493 ) Derivatives (3) 1,944 (114 ) 2,058 — Other (8,777 ) — (8,777 ) — Total other assets and (liabilities) (10,326 ) (114 ) (6,719 ) (3,493 ) $ 9,530,432 $ 3,358,873 $ 5,958,604 $ (3,493 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at September 30, 2017 was $1.8 million and $5.3 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2016 Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fixed maturity investments U.S. treasuries $ 2,617,894 $ 2,617,894 $ — $ — Agencies 90,972 — 90,972 — Municipal 519,069 — 519,069 — Non-U.S. government (Sovereign debt) 333,224 — 333,224 — Non-U.S. government-backed corporate 133,300 — 133,300 — Corporate 1,877,243 — 1,877,243 — Agency mortgage-backed 462,493 — 462,493 — Non-agency mortgage-backed 258,944 — 258,944 — Commercial mortgage-backed 409,747 — 409,747 — Asset-backed 188,358 — 188,358 — Total fixed maturity investments 6,891,244 2,617,894 4,273,350 — Short term investments 1,368,379 — 1,368,379 — Equity investments trading 383,313 383,313 — — Other investments Catastrophe bonds 335,209 — 335,209 — Private equity partnerships (1) 191,061 — — — Senior secured bank loan funds (1) 22,040 — — — Hedge funds (1) 1,495 — — — Total other investments 549,805 — 335,209 — Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (13,004 ) — — (13,004 ) Derivatives (3) (8,922 ) (646 ) (8,276 ) — Other (13,105 ) — (13,105 ) — Total other assets and (liabilities) (35,031 ) (646 ) (21,381 ) (13,004 ) $ 9,157,710 $ 3,000,561 $ 5,955,557 $ (13,004 ) (1) Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet. (2) Included in assumed and ceded (re)insurance contracts at December 31, 2016 was $4.4 million and $17.4 million of other assets and other liabilities, respectively. (3) See “Note 13 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
Schedule Of Quantitative Information Used As Level 3 Inputs	Below is a summary of quantitative information regarding the significant observable and unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis: At September 30, 2017 Fair Value (Level 3) Valuation Technique Unobservable (U) and Observable (O) Inputs Low High Weighted Average or Actual Other assets and (liabilities) Assumed and ceded (re)insurance contracts $ 582 Internal valuation model Bond price (U) $ 101.28 $ 109.27 $ 105.64 Liquidity discount (U) n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (4,075 ) Internal valuation model Net undiscounted cash flows (U) n/a n/a $ (4,733 ) Expected loss ratio (U) n/a n/a 24.3 % Net acquisition expense ratio (O) n/a n/a 13.4 % Contract period (O) 2.0 years 4.7 years 4.1 years Discount rate (U) n/a n/a 1.9 % Total other assets and (liabilities) $ (3,493 )
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs	Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation. Other assets and (liabilities) Balance - July 1, 2017 $ (9,502 ) Total realized and unrealized gains Included in other income 135 Purchases (63 ) Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,525 Purchases 49 Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - July 1, 2016 $ — $ (2,680 ) $ (2,680 ) Total realized and unrealized gains Included in other income — 795 795 Purchases — (10,127 ) (10,127 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 4,587 4,587 Purchases — (10,700 ) (10,700 ) Settlements (7,500 ) — (7,500 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 )
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs	Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation. Other assets and (liabilities) Balance - July 1, 2017 $ (9,502 ) Total realized and unrealized gains Included in other income 135 Purchases (63 ) Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Other assets and (liabilities) Balance - January 1, 2017 $ (13,004 ) Total realized and unrealized gains Included in other income 3,525 Purchases 49 Settlements 5,937 Balance - September 30, 2017 $ (3,493 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - July 1, 2016 $ — $ (2,680 ) $ (2,680 ) Total realized and unrealized gains Included in other income — 795 795 Purchases — (10,127 ) (10,127 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 ) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Fixed maturity investments trading Other assets and (liabilities) Total Balance - January 1, 2016 $ 7,618 $ (5,899 ) $ 1,719 Total realized and unrealized (losses) gains Included in net investment income (118 ) — (118 ) Included in other income — 4,587 4,587 Purchases — (10,700 ) (10,700 ) Settlements (7,500 ) — (7,500 ) Balance - September 30, 2016 $ — $ (12,012 ) $ (12,012 )
Schedule Of Balances Elected To Account For At Fair Value	Below is a summary of the balances the Company has elected to account for at fair value: September 30, December 31, Other investments $ 548,492 $ 549,805 Other assets $ 2,383 $ 4,379 Other liabilities $ 5,876 $ 17,383
Schedule Of Other Investments Measured Using Net Asset Valuations	The table below shows the Company’s portfolio of other investments measured using net asset valuations as a practical expedient: At September 30, 2017 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity partnerships $ 196,280 $ 300,482 See below See below See below Senior secured bank loan funds 19,572 23,758 See below See below See below Hedge funds 596 — See below See below See below Total other investments measured using net asset valuations $ 216,448 $ 324,240

Reinsurance (Tables)

Reinsurance (Tables)	9 Months Ended
	Sep. 30, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]
Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses Incurred	The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred: Three months ended Nine months ended September 30, September 30, September 30, September 30, Premiums written Direct $ 64,040 $ 53,488 $ 205,253 $ 154,205 Assumed 576,229 376,736 2,184,521 1,897,280 Ceded (157,048 ) (146,002 ) (806,672 ) (735,672 ) Net premiums written $ 483,221 $ 284,222 $ 1,583,102 $ 1,315,813 Premiums earned Direct $ 61,908 $ 43,097 $ 176,433 $ 114,173 Assumed 712,499 471,097 1,731,845 1,392,278 Ceded (226,615 ) (167,673 ) (612,176 ) (454,922 ) Net premiums earned $ 547,792 $ 346,521 $ 1,296,102 $ 1,051,529 Claims and claim expenses Gross claims and claim expenses incurred $ 2,482,510 $ 153,846 $ 2,924,217 $ 540,696 Claims and claim expenses recovered (1,260,814 ) (41,271 ) (1,366,853 ) (133,766 ) Net claims and claim expenses incurred $ 1,221,696 $ 112,575 $ 1,557,364 $ 406,930

Reserve for Claims and Claim 28

Reserve for Claims and Claim Expenses (Tables)	9 Months Ended
	Sep. 30, 2017
Insurance Loss Reserves [Abstract]
Schedule of Liability for Unpaid Claims and Claim Expenses	The following table details the Company’s prior year development by segment of its liability for unpaid claims and claim expenses: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Property $ (16,968 ) $ (37,512 ) Casualty and Specialty 14,015 (38,327 ) Other (710 ) (805 ) Total favorable development of prior accident years net claims and claim expenses $ (3,663 ) $ (76,644 ) The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Actuarial methods - actual reported claims lower than expected claims $ (17,004 ) $ (32,209 ) Ogden Rate change 33,481 — Actuarial assumption changes (2,462 ) (6,118 ) Total adverse (favorable) development of prior accident years net claims and claim expenses $ 14,015 $ (38,327 ) The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Property segment, allocated between large and small catastrophe net claims and claim expenses and attritional net claims and claim expenses, included in the other line item: Nine months ended September 30, 2017 2016 (Favorable) adverse development (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events April and May U.S. Tornadoes (2011) $ (4,163 ) $ (3,396 ) Tohoku Earthquake and Tsunami (2011) — (5,894 ) New Zealand Earthquake (2010) 5,001 8,710 New Zealand Earthquake (2011) 5,807 — Other (3,881 ) (7,435 ) Total large catastrophe events 2,764 (8,015 ) Small catastrophe events Fort McMurray Wildfire (2016) (6,386 ) — Tianjin Explosion (2015) (4,896 ) (6,163 ) Other (9,293 ) (23,334 ) Total small catastrophe events (20,575 ) (29,497 ) Total catastrophe net claims and claim expenses (17,811 ) (37,512 ) Actuarial assumption changes 843 — Total net favorable development of prior accident years net claims and claim expenses $ (16,968 ) $ (37,512 ) The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR: At September 30, 2017 Case Reserves Additional Case Reserves IBNR Total Property $ 310,871 $ 416,758 $ 1,917,573 $ 2,645,202 Casualty and Specialty 655,328 132,755 1,734,475 2,522,558 Other 9,904 — 14,649 24,553 Total $ 976,103 $ 549,513 $ 3,666,697 $ 5,192,313 At December 31, 2016 Property $ 214,954 $ 186,308 $ 226,512 $ 627,774 Casualty and Specialty 591,705 105,419 1,498,002 2,195,126 Other 6,935 — 18,459 25,394 Total $ 813,594 $ 291,727 $ 1,742,973 $ 2,848,294 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Nine months ended September 30, 2017 2016 Net reserves as of January 1 $ 2,568,730 $ 2,632,519 Net incurred related to: Current year 1,561,027 483,574 Prior years (3,663 ) (76,644 ) Total net incurred 1,557,364 406,930 Net paid related to: Current year 158,685 39,971 Prior years 396,411 391,047 Total net paid 555,096 431,018 Foreign exchange 33,011 11,899 Net reserves as of September 30 3,604,009 2,620,330 Reinsurance recoverable as of September 30 1,588,304 240,769 Gross reserves as of September 30 $ 5,192,313 $ 2,861,099

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below: September 30, 2017 December 31, 2016 Fair Value Carrying Value Fair Value Carrying Value 3.450% Senior Notes due 2027 $ 296,589 $ 295,179 $ — $ — 3.700% Senior Notes due 2025 309,648 297,225 291,750 296,948 5.75% Senior Notes due 2020 269,265 249,188 270,875 248,941 Series B 7.50% Senior Notes due 2017 — — 257,500 255,352 4.750% Senior Notes due 2025 (DaVinciRe) (1) 158,742 147,653 144,675 147,422 $ 1,034,244 $ 989,245 $ 964,800 $ 948,663 (1) RenaissanceRe owns a noncontrolling economic interest in its joint venture DaVinciRe. Because RenaissanceRe controls a majority of DaVinciRe’s outstanding voting rights, the consolidated financial statements of DaVinciRe are included in the consolidated financial statements of RenaissanceRe. However, RenaissanceRe does not guarantee or provide credit support for DaVinciRe and RenaissanceRe’s financial exposure to DaVinciRe is limited to its investment in DaVinciRe’s shares and counterparty credit risk arising from reinsurance transactions.
Schedule of Line of Credit Facilities	The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below: At September 30, 2017 Issued or Drawn RenaissanceRe Revolving Credit Facility $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 99,168 Uncommitted Standby Letter of Credit Facility with NAB 4,356 Bilateral Letter of Credit Facility with Citibank Europe 192,715 Funds at Lloyd’s Letter of Credit Facilities Renaissance Reinsurance FAL Facility 180,000 Total credit facilities in U.S. dollars $ 476,239 Funds at Lloyd’s Letter of Credit Facilities Specialty Risks FAL Facility £ 10,000 Total credit facilities in British Pounds £ 10,000

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Schedule Of Redeemable Noncontrolling Interest	The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 1,019,918 $ 953,443 $ 994,458 $ 930,955 Redemption of shares from redeemable noncontrolling interest (12,068 ) (400 ) (78,870 ) (92,204 ) Sale of shares to redeemable noncontrolling interests — — 23,921 43,040 Net (loss) attributable to redeemable noncontrolling interest (195,508 ) 30,745 (127,167 ) 101,997 Ending balance $ 812,342 $ 983,788 $ 812,342 $ 983,788 A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below: September 30, December 31, 2016 Redeemable noncontrolling interest - DaVinciRe $ 812,342 $ 994,458 Redeemable noncontrolling interest - Medici 221,387 181,136 Redeemable noncontrolling interests $ 1,033,729 $ 1,175,594 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations set forth below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Redeemable noncontrolling interest - DaVinciRe $ (195,508 ) $ 30,745 $ (127,167 ) $ 101,997 Redeemable noncontrolling interest - Medici (8,769 ) 4,896 (5,171 ) 8,870 Net (loss) income attributable to redeemable noncontrolling interests $ (204,277 ) $ 35,641 $ (132,338 ) $ 110,867 The activity in redeemable noncontrolling interest – Medici is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 222,165 $ 168,960 $ 181,136 $ 115,009 Redemption of shares from redeemable noncontrolling interest (1,400 ) (14,389 ) (27,310 ) (21,729 ) Sale of shares to redeemable noncontrolling interests 9,391 21,298 72,732 78,615 Net (loss) income attributable to redeemable noncontrolling interest (8,769 ) 4,896 (5,171 ) 8,870 Ending balance $ 221,387 $ 180,765 $ 221,387 $ 180,765

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share	The following table sets forth the computation of basic and diluted earnings per common share: Three months ended Nine months ended (common shares in thousands) September 30, September 30, September 30, September 30, Numerator: Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (504,812 ) $ 146,825 $ (241,318 ) $ 411,145 Amount allocated to participating common shareholders (1) (116 ) (1,770 ) (344 ) (4,939 ) Net (loss) income allocated to RenaissanceRe common shareholders $ (504,928 ) $ 145,055 $ (241,662 ) $ 406,206 Denominator: Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares 39,591 40,513 39,979 41,594 Per common share equivalents of employee stock options and restricted shares — 220 — 248 Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 39,591 40,733 39,979 41,842 Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic $ (12.75 ) $ 3.58 $ (6.04 ) $ 9.77 Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted $ (12.75 ) $ 3.56 $ (6.04 ) $ 9.71 (1) Represents earnings attributable to holders of unvested restricted shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2010 Performance-Based Equity Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting, Measurement Disclosures [Abstract]
Schedule Of Significant Components Of The Company's Revenues And Expenses By Segment	A summary of the significant components of the Company’s revenues and expenses by segment is as follows: Three months ended September 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 325,395 $ 314,881 $ (7 ) $ 640,269 Net premiums written $ 269,393 $ 213,835 $ (7 ) $ 483,221 Net premiums earned $ 336,838 $ 210,961 $ (7 ) $ 547,792 Net claims and claim expenses incurred 1,044,418 177,433 (155 ) 1,221,696 Acquisition expenses 17,514 59,248 (1 ) 76,761 Operational expenses 25,123 17,389 25 42,537 Underwriting (loss) income $ (750,217 ) $ (43,109 ) $ 124 (793,202 ) Net investment income 40,257 40,257 Net foreign exchange losses (156 ) (156 ) Equity in earnings of other ventures 1,794 1,794 Other income 2,996 2,996 Net realized and unrealized gains on investments 42,052 42,052 Corporate expenses (4,413 ) (4,413 ) Interest expense (11,799 ) (11,799 ) Loss before taxes (722,471 ) Income tax benefit 18,977 18,977 Net loss attributable to redeemable noncontrolling interests 204,277 204,277 Dividends on preference shares (5,595 ) (5,595 ) Net loss attributable to RenaissanceRe common shareholders $ (504,812 ) Net claims and claim expenses incurred – current accident year $ 1,036,586 $ 172,675 $ — $ 1,209,261 Net claims and claim expenses incurred – prior accident years 7,832 4,758 (155 ) 12,435 Net claims and claim expenses incurred – total $ 1,044,418 $ 177,433 $ (155 ) $ 1,221,696 Net claims and claim expense ratio – current accident year 307.7 % 81.9 % 220.8 % Net claims and claim expense ratio – prior accident years 2.4 % 2.2 % 2.2 % Net claims and claim expense ratio – calendar year 310.1 % 84.1 % 223.0 % Underwriting expense ratio 12.6 % 36.3 % 21.8 % Combined ratio 322.7 % 120.4 % 244.8 % Nine months ended September 30, 2017 Property Casualty and Specialty Other Total Gross premiums written $ 1,345,271 $ 1,044,510 $ (7 ) $ 2,389,774 Net premiums written $ 895,728 $ 687,381 $ (7 ) $ 1,583,102 Net premiums earned $ 716,024 $ 580,085 $ (7 ) $ 1,296,102 Net claims and claim expenses incurred 1,116,273 441,801 (710 ) 1,557,364 Acquisition expenses 75,117 173,179 (2 ) 248,294 Operational expenses 76,841 54,708 37 131,586 Underwriting (loss) income $ (552,207 ) $ (89,603 ) $ 668 (641,142 ) Net investment income 148,745 148,745 Net foreign exchange gains 11,118 11,118 Equity in earnings of other ventures 5,830 5,830 Other income 7,053 7,053 Net realized and unrealized gains on investments 143,538 143,538 Corporate expenses (14,335 ) (14,335 ) Interest expense (32,416 ) (32,416 ) Loss before taxes (371,609 ) Income tax benefit 14,739 14,739 Net income attributable to redeemable noncontrolling interests 132,338 132,338 Dividends on preference shares (16,786 ) (16,786 ) Net loss attributable to RenaissanceRe common shareholders $ (241,318 ) Net claims and claim expenses incurred – current accident year $ 1,133,241 $ 427,786 $ — $ 1,561,027 Net claims and claim expenses incurred – prior accident years (16,968 ) 14,015 (710 ) (3,663 ) Net claims and claim expenses incurred – total $ 1,116,273 $ 441,801 $ (710 ) $ 1,557,364 Net claims and claim expense ratio – current accident year 158.3 % 73.7 % 120.4 % Net claims and claim expense ratio – prior accident years (2.4 )% 2.5 % (0.2 )% Net claims and claim expense ratio – calendar year 155.9 % 76.2 % 120.2 % Underwriting expense ratio 21.2 % 39.2 % 29.3 % Combined ratio 177.1 % 115.4 % 149.5 % Three months ended September 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 119,904 $ 310,320 $ — $ 430,224 Net premiums written $ 90,909 $ 193,313 $ — $ 284,222 Net premiums earned $ 172,661 $ 173,860 $ — $ 346,521 Net claims and claim expenses incurred 23,539 89,844 (808 ) 112,575 Acquisition expenses 21,663 58,917 — 80,580 Operational expenses 24,258 16,217 18 40,493 Underwriting income $ 103,201 $ 8,882 $ 790 112,873 Net investment income 51,423 51,423 Net foreign exchange losses (5,986 ) (5,986 ) Equity in losses of other ventures (11,630 ) (11,630 ) Other income 2,268 2,268 Net realized and unrealized gains on investments 59,870 59,870 Corporate expenses (11,537 ) (11,537 ) Interest expense (10,536 ) (10,536 ) Income before taxes and noncontrolling interests 186,745 Income tax benefit 1,316 1,316 Net income attributable to noncontrolling interests (35,641 ) (35,641 ) Dividends on preference shares (5,595 ) (5,595 ) Net income available to RenaissanceRe common shareholders $ 146,825 Net claims and claim expenses incurred – current accident year $ 42,062 $ 116,298 $ — $ 158,360 Net claims and claim expenses incurred – prior accident years (18,523 ) (26,454 ) (808 ) (45,785 ) Net claims and claim expenses incurred – total $ 23,539 $ 89,844 $ (808 ) $ 112,575 Net claims and claim expense ratio – current accident year 24.4 % 66.9 % 45.7 % Net claims and claim expense ratio – prior accident years (10.8 )% (15.2 )% (13.2 )% Net claims and claim expense ratio – calendar year 13.6 % 51.7 % 32.5 % Underwriting expense ratio 26.6 % 43.2 % 34.9 % Combined ratio 40.2 % 94.9 % 67.4 % Nine months ended September 30, 2016 Property Casualty and Specialty Other Total Gross premiums written $ 1,058,816 $ 992,669 $ — $ 2,051,485 Net premiums written $ 674,361 $ 641,452 $ — $ 1,315,813 Net premiums earned $ 538,953 $ 512,576 $ — $ 1,051,529 Net claims and claim expenses incurred 125,618 282,117 (805 ) 406,930 Acquisition expenses 71,176 144,001 — 215,177 Operational expenses 79,441 68,261 99 147,801 Underwriting income $ 262,718 $ 18,197 $ 706 281,621 Net investment income 134,410 134,410 Net foreign exchange losses (8,368 ) (8,368 ) Equity in losses of other ventures (3,997 ) (3,997 ) Other income 9,001 9,001 Net realized and unrealized gains on investments 191,295 191,295 Corporate expenses (25,514 ) (25,514 ) Interest expense (31,610 ) (31,610 ) Income before taxes and noncontrolling interests 546,838 Income tax expense (8,040 ) (8,040 ) Net income attributable to noncontrolling interests (110,867 ) (110,867 ) Dividends on preference shares (16,786 ) (16,786 ) Net income available to RenaissanceRe common shareholders $ 411,145 Net claims and claim expenses incurred – current accident year $ 163,130 $ 320,444 $ — $ 483,574 Net claims and claim expenses incurred – prior accident years (37,512 ) (38,327 ) (805 ) (76,644 ) Net claims and claim expenses incurred – total $ 125,618 $ 282,117 $ (805 ) $ 406,930 Net claims and claim expense ratio – current accident year 30.3 % 62.5 % 46.0 % Net claims and claim expense ratio – prior accident years (7.0 )% (7.5 )% (7.3 )% Net claims and claim expense ratio – calendar year 23.3 % 55.0 % 38.7 % Underwriting expense ratio 28.0 % 41.4 % 34.5 % Combined ratio 51.3 % 96.4 % 73.2 %

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Summary of Derivative Instruments [Abstract]
Schedule of Location on Consolidated Balance Sheets and Fair Value Of Principal Derivative Instruments	The tables below show the gross and net amounts of recognized derivative assets and liabilities at fair value, including the location on the consolidated balance sheets of the Company’s principal derivative instruments: Derivative Assets At September 30, 2017 Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Balance Sheet Location Collateral Net Amount Interest rate futures $ 740 614 $ 126 Other assets $ — $ 126 Interest rate swaps 551 277 274 Other assets — 274 Foreign currency forward contracts (1) 4,758 557 4,201 Other assets — 4,201 Foreign currency forward contracts (2) 43 14 29 Other assets — 29 Credit default swaps 956 308 648 Other assets — 648 Total $ 7,048 $ 1,770 $ 5,278 $ — $ 5,278 Derivative Liabilities At September 30, 2017 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet Balance Sheet Location Collateral Pledged Net Amount Interest rate futures $ 854 614 $ 240 Other liabilities $ 240 $ — Interest rate swaps 280 277 3 Other liabilities 3 — Foreign currency forward contracts (1) 2,996 — 2,996 Other liabilities — 2,996 Foreign currency forward contracts (2) 90 14 76 Other liabilities — 76 Credit default swaps 327 308 19 Other liabilities — 19 Total $ 4,547 $ 1,213 $ 3,334 $ 243 $ 3,091 (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations. Derivative Assets At December 31, 2016 Gross Amounts of Recognized Assets Gross Amounts Offset in the Balance Sheet Net Amounts of Assets Presented in the Balance Sheet Balance Sheet Location Collateral Net Amount Interest rate futures $ 1,384 1,235 $ 149 Other assets $ — $ 149 Foreign currency forward contracts (1) 774 — 774 Other assets — 774 Foreign currency forward contracts (2) 621 447 174 Other assets — 174 Credit default swaps 1,429 23 1,406 Other assets — 1,406 Total $ 4,208 $ 1,705 $ 2,503 $ — $ 2,503 Derivative Liabilities At December 31, 2016 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Balance Sheet Net Amounts of Liabilities Presented in the Balance Sheet Balance Sheet Location Collateral Pledged Net Amount Interest rate futures $ 2,030 1,235 $ 795 Other liabilities $ 789 $ 6 Foreign currency forward contracts (1) 10,550 397 10,153 Other liabilities — 10,153 Foreign currency forward contracts (2) 766 447 319 Other liabilities — 319 Credit default swaps 181 23 158 Other liabilities — 158 Total $ 13,527 $ 2,102 $ 11,425 $ 789 $ 10,636 (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations.
Schedule of Gain (Loss) Recognized In Consolidated Statements Of Operations Related To Principal Derivative Instruments	The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its principal derivative instruments are shown in the following table: Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Three months ended September 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (3,016 ) $ 1,040 Interest rate swaps Net realized and unrealized gains on investments 271 — Foreign currency forward contracts (1) Net foreign exchange (losses) gains 2,056 5,097 Foreign currency forward contracts (2) Net foreign exchange (losses) gains (40 ) (489 ) Credit default swaps Net realized and unrealized gains on investments (1,275 ) 687 Total $ (2,004 ) $ 6,335 Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Nine months ended September 30, 2017 2016 Interest rate futures Net realized and unrealized gains on investments $ (4,064 ) $ (27,775 ) Interest rate swaps Net realized and unrealized gains on investments 271 — Foreign currency forward contracts (1) Net foreign exchange (losses) gains 8,339 (92 ) Foreign currency forward contracts (2) Net foreign exchange (losses) gains (940 ) (3,706 ) Credit default swaps Net realized and unrealized gains on investments (551 ) 902 Total $ 3,055 $ (30,671 ) (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2) Contracts used to manage foreign currency risks in investment operations.

Condensed Consolidating Finan34

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2017
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheet at September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 193,268 $ 130,802 $ — $ 35,098 $ 9,283,010 $ — $ 9,642,178 Cash and cash equivalents 12,370 226 10 7,663 561,307 — 581,576 Investments in subsidiaries 3,968,721 37,834 — 1,152,247 — (5,158,802 ) — Due from subsidiaries and affiliates 107,746 91,891 — — — (199,637 ) — Premiums receivable — — — — 1,521,266 — 1,521,266 Prepaid reinsurance premiums — — — — 635,756 — 635,756 Reinsurance recoverable — — — — 1,588,304 — 1,588,304 Accrued investment income 125 197 — 59 37,985 — 38,366 Deferred acquisition costs — — — — 434,914 — 434,914 Receivable for investments sold 9,042 13,472 — 101 171,143 — 193,758 Other assets 429,594 36,825 — 435,815 98,023 (836,238 ) 164,019 Goodwill and other intangible assets 126,246 — — — 118,541 — 244,787 Total assets $ 4,847,112 $ 311,247 $ 10 $ 1,630,983 $ 14,450,249 $ (6,194,677 ) $ 15,044,924 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 5,192,313 $ — $ 5,192,313 Unearned premiums — — — — 1,713,069 — 1,713,069 Debt 417,000 — — 841,592 147,653 (417,000 ) 989,245 Amounts due to subsidiaries and affiliates 2,950 55 — 97,365 — (100,370 ) — Reinsurance balances payable — — — — 1,034,454 — 1,034,454 Payable for investments purchased 8,989 17,938 — — 350,616 — 377,543 Other liabilities 15,161 927 — 9,926 282,647 (7,102 ) 301,559 Total liabilities 444,100 18,920 — 948,883 8,720,752 (524,472 ) 9,608,183 Redeemable noncontrolling interests — — — — 1,033,729 — 1,033,729 Shareholders’ Equity Total shareholders’ equity 4,403,012 292,327 10 682,100 4,695,768 (5,670,205 ) 4,403,012 Total liabilities, noncontrolling interests and shareholders’ equity $ 4,847,112 $ 311,247 $ 10 $ 1,630,983 $ 14,450,249 $ (6,194,677 ) $ 15,044,924 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Balance Sheet at December 31, 2016 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 387,274 $ 119,163 $ 267,556 $ 45,027 $ 8,497,948 $ — $ 9,316,968 Cash and cash equivalents 7,067 162 6,671 9,397 397,860 — 421,157 Investments in subsidiaries 4,074,769 34,761 843,089 1,165,413 — (6,118,032 ) — Due from subsidiaries and affiliates 7,413 91,892 — — — (99,305 ) — Premiums receivable — — — — 987,323 — 987,323 Prepaid reinsurance premiums — — — — 441,260 — 441,260 Reinsurance recoverable — — — — 279,564 — 279,564 Accrued investment income 105 289 551 106 37,025 — 38,076 Deferred acquisition costs — — — — 335,325 — 335,325 Receivable for investments sold 136 2 99 45 105,559 — 105,841 Other assets 410,757 37,204 4,689 127,572 118,098 (522,938 ) 175,382 Goodwill and other intangible assets 130,407 — — — 120,779 — 251,186 Total assets $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ — $ 2,848,294 $ — $ 2,848,294 Unearned premiums — — — — 1,231,573 — 1,231,573 Debt 117,000 — 255,352 545,889 147,422 (117,000 ) 948,663 Amounts due to subsidiaries and affiliates 14,644 42 123 96,061 — (110,870 ) — Reinsurance balances payable — — — — 673,983 — 673,983 Payable for investments purchased — — — — 305,714 — 305,714 Other liabilities 19,707 10,544 — 13,350 270,610 (12,527 ) 301,684 Total liabilities 151,351 10,586 255,475 655,300 5,477,596 (240,397 ) 6,309,911 Redeemable noncontrolling interests — — — — 1,175,594 — 1,175,594 Shareholders’ Equity Total shareholders’ equity 4,866,577 272,887 867,180 692,260 4,667,551 (6,499,878 ) 4,866,577 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,017,928 $ 283,473 $ 1,122,655 $ 1,347,560 $ 11,320,741 $ (6,740,275 ) $ 12,352,082 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statements of Operations	Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 1,296,102 $ — $ 1,296,102 Net investment income 16,466 1,436 1,373 1,843 146,816 (19,189 ) 148,745 Net foreign exchange (losses) gains (1 ) — — — 11,119 — 11,118 Equity in (losses) earnings of other ventures — — — (412 ) 6,242 — 5,830 Other income — — — — 7,053 — 7,053 Net realized and unrealized gains (losses) on investments 155 6,528 4,916 (217 ) 132,156 — 143,538 Total revenues 16,620 7,964 6,289 1,214 1,599,488 (19,189 ) 1,612,386 Expenses Net claims and claim expenses incurred — — — — 1,557,364 — 1,557,364 Acquisition expenses — — — — 248,294 — 248,294 Operational expenses 9,398 57 86 20,892 116,212 (15,059 ) 131,586 Corporate expenses 14,640 — — — (305 ) — 14,335 Interest expense 464 — 2,461 22,401 7,554 (464 ) 32,416 Total expenses 24,502 57 2,547 43,293 1,929,119 (15,523 ) 1,983,995 (Loss) income before equity in net (loss) income of subsidiaries and taxes (7,882 ) 7,907 3,742 (42,079 ) (329,631 ) (3,666 ) (371,609 ) Equity in net (loss) income of subsidiaries (219,309 ) 3,234 28,028 20,584 — 167,463 — (Loss) Income before taxes (227,191 ) 11,141 31,770 (21,495 ) (329,631 ) 163,797 (371,609 ) Income tax benefit (expense) 2,659 (2,572 ) (1,175 ) 9,281 6,546 — 14,739 Net (loss) income (224,532 ) 8,569 30,595 (12,214 ) (323,085 ) 163,797 (356,870 ) Net loss attributable to redeemable noncontrolling interests — — — — 132,338 — 132,338 Net (loss) income attributable to RenaissanceRe (224,532 ) 8,569 30,595 (12,214 ) (190,747 ) 163,797 (224,532 ) Dividends on preference shares (16,786 ) — — — — — (16,786 ) Net (loss) income (attributable) available to RenaissanceRe common shareholders $ (241,318 ) $ 8,569 $ 30,595 $ (12,214 ) $ (190,747 ) $ 163,797 $ (241,318 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 547,792 $ — $ 547,792 Net investment income (loss) 5,725 544 (3 ) 1,335 39,342 (6,686 ) 40,257 Net foreign exchange losses — — — — (156 ) — (156 ) Equity in earnings of other ventures — — — 38 1,756 — 1,794 Other income 1 — — — 2,995 — 2,996 Net realized and unrealized gains on investments 110 2,186 — 51 39,705 — 42,052 Total revenues 5,836 2,730 (3 ) 1,424 631,434 (6,686 ) 634,735 Expenses Net claims and claim expenses incurred — — — — 1,221,696 — 1,221,696 Acquisition expenses — — — — 76,761 — 76,761 Operational expenses 2,910 17 1 6,266 37,752 (4,409 ) 42,537 Corporate expenses 4,634 — — — (221 ) — 4,413 Interest expense 183 — — 9,258 2,541 (183 ) 11,799 Total expenses 7,727 17 1 15,524 1,338,529 (4,592 ) 1,357,206 (Loss) income before equity in net (loss) income of subsidiaries and taxes (1,891 ) 2,713 (4 ) (14,100 ) (707,095 ) (2,094 ) (722,471 ) (Loss) equity in net (loss) income of subsidiaries (499,408 ) 928 — (16,352 ) — 514,832 — (Loss) Income before taxes (501,299 ) 3,641 (4 ) (30,452 ) (707,095 ) 512,738 (722,471 ) Income tax benefit (expense) 2,082 (890 ) 29 3,307 14,449 — 18,977 Net (loss) income (499,217 ) 2,751 25 (27,145 ) (692,646 ) 512,738 (703,494 ) Net loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Net (loss) income attributable to RenaissanceRe (499,217 ) 2,751 25 (27,145 ) (488,369 ) 512,738 (499,217 ) Dividends on preference shares (5,595 ) — — — — — (5,595 ) Net (loss) income (attributable) available attributable to RenaissanceRe common shareholders $ (504,812 ) $ 2,751 $ 25 $ (27,145 ) $ (488,369 ) $ 512,738 $ (504,812 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 1,051,529 $ — $ 1,051,529 Net investment income 18,499 1,395 3,074 421 129,038 (18,017 ) 134,410 Net foreign exchange losses (2 ) — — — (8,366 ) — (8,368 ) Equity in losses of other ventures — — — — (3,997 ) — (3,997 ) Other (loss) income (770 ) — — — 9,771 — 9,001 Net realized and unrealized gains on investments 4,951 3,651 7,483 — 175,210 — 191,295 Total revenues 22,678 5,046 10,557 421 1,353,185 (18,017 ) 1,373,870 Expenses Net claims and claim expenses incurred — — — — 406,930 — 406,930 Acquisition expenses — — — — 215,177 — 215,177 Operational expenses (3,038 ) (61 ) 176 16,603 145,466 (11,345 ) 147,801 Corporate expenses 22,411 203 — 7 2,893 — 25,514 Interest expense 421 — 4,429 19,632 7,549 (421 ) 31,610 Total expenses 19,794 142 4,605 36,242 778,015 (11,766 ) 827,032 Income before equity in net income of subsidiaries and taxes 2,884 4,904 5,952 (35,821 ) 575,170 (6,251 ) 546,838 Equity in net income of subsidiaries 424,077 2,996 31,727 42,774 — (501,574 ) — Income before taxes 426,961 7,900 37,679 6,953 575,170 (507,825 ) 546,838 Income tax benefit (expense) 970 (1,791 ) (1,583 ) 8,456 (14,092 ) — (8,040 ) Net income 427,931 6,109 36,096 15,409 561,078 (507,825 ) 538,798 Net income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Net income attributable to RenaissanceRe 427,931 6,109 36,096 15,409 450,211 (507,825 ) 427,931 Dividends on preference shares (16,786 ) — — — — — (16,786 ) Net income available to RenaissanceRe common shareholders $ 411,145 $ 6,109 $ 36,096 $ 15,409 $ 450,211 $ (507,825 ) $ 411,145 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ — $ 346,521 $ — $ 346,521 Net investment income 5,892 441 795 140 50,406 (6,251 ) 51,423 Net foreign exchange losses — — — — (5,986 ) — (5,986 ) Equity in losses of other ventures — — — — (11,630 ) — (11,630 ) Other income 21 — — — 2,247 — 2,268 Net realized and unrealized (losses) gains on investments (336 ) 1,397 2,105 — 56,704 — 59,870 Total revenues 5,577 1,838 2,900 140 438,262 (6,251 ) 442,466 Expenses Net claims and claim expenses incurred — — — — 112,575 — 112,575 Acquisition expenses — — — — 80,580 — 80,580 Operational expenses (1,233 ) 36 60 5,021 40,018 (3,409 ) 40,493 Corporate expenses 11,617 — — — (80 ) — 11,537 Interest expense 140 — 1,476 6,545 2,515 (140 ) 10,536 Total expenses 10,524 36 1,536 11,566 235,608 (3,549 ) 255,721 Income (loss) before equity in net income of subsidiaries and taxes (4,947 ) 1,802 1,364 (11,426 ) 202,654 (2,702 ) 186,745 Equity in net income of subsidiaries 158,862 1,463 (2,694 ) 1,130 — (158,761 ) — Income (loss) before taxes 153,915 3,265 (1,330 ) (10,296 ) 202,654 (161,463 ) 186,745 Income tax (expense) benefit (1,495 ) (324 ) (401 ) 2,785 751 — 1,316 Net income (loss) 152,420 2,941 (1,731 ) (7,511 ) 203,405 (161,463 ) 188,061 Net income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Net income (loss) attributable to RenaissanceRe 152,420 2,941 (1,731 ) (7,511 ) 167,764 (161,463 ) 152,420 Dividends on preference shares (5,595 ) — — — — — (5,595 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 146,825 $ 2,941 $ (1,731 ) $ (7,511 ) $ 167,764 $ (161,463 ) $ 146,825 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statement of Comprehensive Income	Condensed Consolidating Statement of Comprehensive (Loss) Income for the nine months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive (loss) income Net (loss) income $ (224,532 ) $ 8,569 $ 30,595 $ (12,214 ) $ (323,085 ) $ 163,797 $ (356,870 ) Change in net unrealized gains on investments — — — — (972 ) — (972 ) Comprehensive (loss) income (224,532 ) 8,569 30,595 (12,214 ) (324,057 ) 163,797 (357,842 ) Net loss attributable to redeemable noncontrolling interests — — — — 132,338 — 132,338 Comprehensive loss attributable to noncontrolling interests — — — — 132,338 — 132,338 Comprehensive (loss) income attributable to RenaissanceRe $ (224,532 ) $ 8,569 $ 30,595 $ (12,214 ) $ (191,719 ) $ 163,797 $ (225,504 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended September 30, 2016 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 152,420 $ 2,941 $ (1,731 ) $ (7,511 ) $ 203,405 $ (161,463 ) $ 188,061 Change in net unrealized gains on investments — — — — 284 — 284 Comprehensive income (loss) 152,420 2,941 (1,731 ) (7,511 ) 203,689 (161,463 ) 188,345 Net income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (35,641 ) — (35,641 ) Comprehensive income (loss) attributable to RenaissanceRe $ 152,420 $ 2,941 $ (1,731 ) $ (7,511 ) $ 168,048 $ (161,463 ) $ 152,704 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive Income for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 427,931 $ 6,109 $ 36,096 $ 15,409 $ 561,078 $ (507,825 ) $ 538,798 Change in net unrealized gains on investments — — — — 513 — 513 Comprehensive income 427,931 6,109 36,096 15,409 561,591 (507,825 ) 539,311 Net income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Comprehensive income attributable to redeemable noncontrolling interests — — — — (110,867 ) — (110,867 ) Comprehensive income available to RenaissanceRe $ 427,931 $ 6,109 $ 36,096 $ 15,409 $ 450,724 $ (507,825 ) $ 428,444 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments. Condensed Consolidating Statement of Comprehensive (Loss) Income for the three months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive (loss) income Net (loss) income $ (499,217 ) $ 2,751 $ 25 $ (27,145 ) $ (692,646 ) $ 512,738 $ (703,494 ) Change in net unrealized gains on investments — — — — 300 — 300 Comprehensive (loss) income (499,217 ) 2,751 25 (27,145 ) (692,346 ) 512,738 (703,194 ) Net loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Comprehensive loss attributable to redeemable noncontrolling interests — — — — 204,277 — 204,277 Comprehensive (loss) income attributable to RenaissanceRe $ (499,217 ) $ 2,751 $ 25 $ (27,145 ) $ (488,069 ) $ 512,738 $ (498,917 ) (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Condensed Consolidating Statements Of Cash Flows	Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2017 RenaissanceRe RenRe North Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (6,870 ) $ (8,209 ) $ (2,262 ) $ (343,093 ) $ 982,136 $ 621,702 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 106,761 74,455 289,741 279,830 6,912,215 7,663,002 Purchases of fixed maturity investments trading (118,402 ) (69,168 ) (143,991 ) (270,785 ) (7,195,939 ) (7,798,285 ) Net (purchases) sales of equity investments trading — (1,708 ) 85,324 — (22,045 ) 61,571 Net sales (purchases) of short term investments 205,864 (4,495 ) 41,299 (305 ) (388,689 ) (146,326 ) Net sales of other investments — — — — 5,181 5,181 Dividends and return of capital from subsidiaries 285,515 9,175 — 41,866 (336,556 ) — Contributions to subsidiaries (500,000 ) — (26,649 ) (9,175 ) 535,824 — Due to (from) subsidiary 290,130 14 (123 ) 4,062 (294,083 ) — Net cash provided by (used in) investing activities 269,868 8,273 245,601 45,493 (784,092 ) (214,857 ) Cash flows (used in) provided by financing activities Dividends paid – RenaissanceRe common shares (38,624 ) — — — — (38,624 ) Dividends paid – preference shares (16,786 ) — — — — (16,786 ) RenaissanceRe common share repurchases (188,591 ) — — — — (188,591 ) Issuance of debt, net of expenses — — — 295,866 — 295,866 Repayment of debt — — (250,000 ) — — (250,000 ) Net third party redeemable noncontrolling interest share transactions — — — — (44,193 ) (44,193 ) Taxes paid on withholding shares (13,694 ) — — — — (13,694 ) Net cash (used in) provided by financing activities (257,695 ) — (250,000 ) 295,866 (44,193 ) (256,022 ) Effect of exchange rate changes on foreign currency cash — — — — 9,596 9,596 Net increase (decrease) in cash and cash equivalents 5,303 64 (6,661 ) (1,734 ) 163,447 160,419 Cash and cash equivalents, beginning of period 7,067 162 6,671 9,397 397,860 421,157 Cash and cash equivalents, end of period $ 12,370 $ 226 $ 10 $ 7,663 $ 561,307 $ 581,576 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2016 RenaissanceRe RenRe North Inc. Platinum Underwriters Finance, Inc. (Subsidiary Issuer) RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (7,644 ) $ 1,847 $ (11,062 ) $ (35,171 ) $ 432,395 $ 380,365 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 272,710 62,959 113,947 — 6,059,403 6,509,019 Purchases of fixed maturity investments trading (336,345 ) (115,849 ) (259,165 ) — (6,033,479 ) (6,744,838 ) Proceeds from sales and maturities of fixed maturity investments available for sale — — — — 5,931 5,931 Net (purchases) sales of equity investments trading — (2,392 ) 192,911 — (7,407 ) 183,112 Net sales (purchases) of short term investments 122,656 67,986 (41,881 ) — (19,892 ) 128,869 Net purchases of other investments — — — — (56,765 ) (56,765 ) Net sales of other assets — — — — 400 400 Dividends and return of capital from subsidiaries 408,189 2,900 — 9,300 (420,389 ) — Contributions to subsidiaries (91,001 ) — — — 91,001 — Due to (from) subsidiaries (3,497 ) (22,502 ) (108 ) 27,724 (1,617 ) — Net cash provided by (used in) investing activities 372,712 (6,898 ) 5,704 37,024 (382,814 ) 25,728 Cash flows used in financing activities Dividends paid – RenaissanceRe common shares (38,886 ) — — — — (38,886 ) Dividends paid – preference shares (16,786 ) — — — — (16,786 ) RenaissanceRe common share repurchases (309,434 ) — — — — (309,434 ) Net third party redeemable noncontrolling interest share transactions — — — — (45,496 ) (45,496 ) Taxes paid on withholding shares — — — — (10,362 ) (10,362 ) Net cash used in financing activities (365,106 ) — — — (55,858 ) (420,964 ) Effect of exchange rate changes on foreign currency cash — — — — 1,316 1,316 Net (decrease) increase in cash and cash equivalents (38 ) (5,051 ) (5,358 ) 1,853 (4,961 ) (13,555 ) Cash and cash equivalents, beginning of period 10,185 5,908 7,103 677 483,012 506,885 Cash and cash equivalents, end of period $ 10,147 $ 857 $ 1,745 $ 2,530 $ 478,051 $ 493,330 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Organization (Details)

Organization (Details)	Nov. 13, 2014
RenaissanceRe Upsilon Fund Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Percent of segregated funds owned by third party investors	100.00%

Significant Accounting Polici36

Significant Accounting Policies Significant Accounting Policies (Details) $ in Millions	Jan. 01, 2017USD ($)
Retained Earnings | Cumulative effect of adoption of ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 2.2

Investments (Schedule of Fair V

Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Total fixed maturity investments trading	$ 7,092,969	$ 6,891,244
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	2,956,952	2,617,894
Agencies
Investment [Line Items]
Total fixed maturity investments trading	41,109	90,972
Municipal
Investment [Line Items]
Total fixed maturity investments trading	521,220	519,069
Non-U.S. government (Sovereign debt)
Investment [Line Items]
Total fixed maturity investments trading	177,855	333,224
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	121,892	133,300
Corporate
Investment [Line Items]
Total fixed maturity investments trading	2,028,750	1,877,243
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	499,310	462,493
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	299,530	258,944
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	263,029	409,747
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 183,322	$ 188,358

Investments (Schedule of Contra

Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Trading Securities [Abstract]
Amortized Cost, Due in less than one year	$ 366,988
Amortized Cost, Due after one through five years	4,326,788
Amortized Cost, Due after five through ten years	985,535
Amortized Cost, Due after ten years	151,964
Amortized Cost	7,061,487
Fair Value, Due in less than one year	367,091
Fair Value, Due after one through five years	4,324,948
Fair Value, Due after five through ten years	1,001,975
Fair Value, Due after ten years	153,764
Fair Value	7,092,969
Mortgage-backed
Trading Securities [Abstract]
Amortized Cost	1,047,676
Fair Value	1,061,869
Asset-backed
Trading Securities [Abstract]
Amortized Cost	182,536
Fair Value	$ 183,322

Investments (Schedule of Fair39

Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 402,035	$ 383,313
Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	275,373	275,065
Communications and technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	45,592	36,770
Industrial, utilities and energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	32,922	30,303
Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	22,613	20,501
Healthcare
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	21,113	17,245
Basic materials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 4,422	$ 3,429

Investments (Pledged Investment

Investments (Pledged Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments [Abstract]
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties	$ 3,300	$ 2,700
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities	$ 1,400	$ 842.6

Investments (Reverse Purchase A

Investments (Reverse Purchase Agreements) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 477.5	$ 78.7
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

Investments (Schedule of Net In

Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 44,238	$ 55,513	$ 160,286	$ 146,045
Investment expenses	(3,981)	(4,090)	(11,541)	(11,635)
Net investment income	40,257	51,423	148,745	134,410
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	45,305	39,959	133,080	122,056
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	2,771	1,174	7,476	3,401
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	930	797	2,630	3,325
Private equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	6,371	4,572	20,784	(430)
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	(11,491)	8,765	(4,520)	17,109
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 352	$ 246	$ 836	$ 584

Investments (Schedule of Net Re

Investments (Schedule of Net Realized and Unrealized Gains on Investments and Net Other-Than-Temporary Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gain (Loss) on Investments [Line Items]
Net realized and unrealized gains on investments	$ 42,052	$ 59,870	$ 143,538	$ 191,295
Fixed maturity investments
Gain (Loss) on Investments [Line Items]
Gross realized gains	16,343	20,383	43,053	60,794
Gross realized losses	(6,126)	(3,363)	(29,902)	(25,832)
Net realized gains on fixed maturity investments	10,217	17,020	13,151	34,962
Net unrealized gains (losses) on investments trading	5,545	(4,235)	48,940	125,501
Derivatives
Gain (Loss) on Investments [Line Items]
Net realized and unrealized (losses) gains on investments-related derivatives	(4,020)	1,727	(4,344)	(26,873)
Equity investments
Gain (Loss) on Investments [Line Items]
Net realized gains on fixed maturity investments	13,675	127	49,736	14,038
Net unrealized gains (losses) on investments trading	$ 16,635	$ 45,231	$ 36,055	$ 43,667

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity investments trading	$ 402,035	$ 383,313
Other investments	548,492	549,805
Other assets and (liabilities)	(5,876)	(17,383)
Other assets	2,383	4,379
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	7,092,969	6,891,244
Short term investments	1,497,262	1,368,379
Equity investments trading		383,313
Other investments	548,492	549,805
Other assets and (liabilities)	(10,326)	(35,031)
Total assets and liabilities measured on recurring basis	9,530,432	9,157,710
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,956,952	2,617,894
Short term investments	0	0
Equity investments trading	402,035	383,313
Other investments	0	0
Other assets and (liabilities)	(114)	(646)
Total assets and liabilities measured on recurring basis	3,358,873	3,000,561
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	4,136,017	4,273,350
Short term investments	1,497,262	1,368,379
Equity investments trading	0	0
Other investments	332,044	335,209
Other assets and (liabilities)	(6,719)	(21,381)
Total assets and liabilities measured on recurring basis	5,958,604	5,955,557
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Short term investments	0	0
Equity investments trading	0	0
Other investments	0	0
Other assets and (liabilities)	(3,493)	(13,004)
Total assets and liabilities measured on recurring basis	(3,493)	(13,004)
Fair Value, Measurements, Recurring | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,956,952	2,617,894
Fair Value, Measurements, Recurring | U.S. treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,956,952	2,617,894
Fair Value, Measurements, Recurring | U.S. treasuries | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | U.S. treasuries | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	41,109	90,972
Fair Value, Measurements, Recurring | Agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agencies | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	41,109	90,972
Fair Value, Measurements, Recurring | Agencies | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	521,220	519,069
Fair Value, Measurements, Recurring | Municipal | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Municipal | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	521,220	519,069
Fair Value, Measurements, Recurring | Municipal | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	177,855	333,224
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	177,855	333,224
Fair Value, Measurements, Recurring | Non-U.S. government (Sovereign debt) | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	121,892	133,300
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	121,892	133,300
Fair Value, Measurements, Recurring | Non-U.S. government-backed corporate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,028,750	1,877,243
Fair Value, Measurements, Recurring | Corporate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Corporate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	2,028,750	1,877,243
Fair Value, Measurements, Recurring | Corporate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	499,310	462,493
Fair Value, Measurements, Recurring | Agency mortgage-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Agency mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	499,310	462,493
Fair Value, Measurements, Recurring | Agency mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-agency mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	299,530	258,944
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	299,530	258,944
Fair Value, Measurements, Recurring | Non-agency mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Commercial mortgage-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	263,029	409,747
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	263,029	409,747
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Asset-backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	183,322	188,358
Fair Value, Measurements, Recurring | Asset-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Asset-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	183,322	188,358
Fair Value, Measurements, Recurring | Asset-backed | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Fair Value, Measurements, Recurring | Catastrophe bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	332,044	335,209
Fair Value, Measurements, Recurring | Catastrophe bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	332,044	335,209
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	196,280	191,061
Fair Value, Measurements, Recurring | Private equity partnerships | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Private equity partnerships | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	19,572	22,040
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Senior secured bank loan funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	596	1,495
Fair Value, Measurements, Recurring | Hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Hedge funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(3,493)	(13,004)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(3,493)	(13,004)
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	1,800	4,400
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(5,300)	(17,400)
Fair Value, Measurements, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	1,944	(8,922)
Fair Value, Measurements, Recurring | Derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(114)	(646)
Fair Value, Measurements, Recurring | Derivatives | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	2,058	(8,276)
Fair Value, Measurements, Recurring | Derivatives | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(8,777)	(13,105)
Fair Value, Measurements, Recurring | Other | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	0	0
Fair Value, Measurements, Recurring | Other | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	(8,777)	(13,105)
Fair Value, Measurements, Recurring | Other | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets and (liabilities)	$ 0	$ 0

Reinsurance (Effect Of Reinsura

Reinsurance (Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Premiums written
Direct	$ 64,040	$ 53,488	$ 205,253	$ 154,205
Assumed	576,229	376,736	2,184,521	1,897,280
Ceded	(157,048)	(146,002)	(806,672)	(735,672)
Net premiums written	483,221	284,222	1,583,102	1,315,813
Premiums earned
Direct	61,908	43,097	176,433	114,173
Assumed	712,499	471,097	1,731,845	1,392,278
Ceded	(226,615)	(167,673)	(612,176)	(454,922)
Net premiums earned	547,792	346,521	1,296,102	1,051,529
Claims and claim expenses
Gross claims and claim expenses incurred	2,482,510	153,846	2,924,217	540,696
Claims and claim expenses recovered	(1,260,814)	(41,271)	(1,366,853)	(133,766)
Net claims and claim expenses incurred	$ 1,221,696	$ 112,575	$ 1,557,364	$ 406,930

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	$ 5,876		$ 5,876		$ 17,383
Debt	989,245		989,245		948,663
Debt, Fair value	1,034,200		1,034,200		964,800
Net unrealized gains (losses) recognized in earnings			2,686	$ (17,608)
Net investment income | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	(9,800)	$ 9,400	2,700	$ 6,100
Other income (loss) | Other assets and (liabilities)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings	0	$ 0	0		$ 0
Significant Unobservable Inputs (Level 3) | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	3,493		3,493
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	582		582
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contract | Internal Valuation Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 4,075		$ 4,075
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.60%		1.60%		1.40%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.60%		1.60%		2.00%
Municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.90%		1.90%		2.40%
Non-U.S. government (Sovereign debt)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.70%		1.60%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.90%		1.90%		1.50%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.50%		3.50%		3.70%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.90%		2.90%		2.90%
Weighted average life			6 years 3 months 18 days		6 years 10 months 24 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.80%		3.80%		4.30%
Weighted average life			5 years		5 years 1 month 6 days
AltA non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.70%		3.70%		5.20%
Weighted average life			6 years 2 months 12 days		6 years
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.10%		3.10%		2.60%
Weighted average life			4 years 6 months		3 years 10 months 24 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.40%		2.40%		2.30%
Weighted average life			2 years 9 months 18 days		2 years 7 months 6 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.10%		1.10%		0.70%
Restricted stock units | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	$ 8,800		$ 8,800
Private equity partnerships | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			7 years
Private equity partnerships | High
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in closed end fund	19,600		$ 19,600
Senior secured bank loan funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			4 years
Senior secured bank loan funds | High
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Hedge fund side pocket investments	$ 600		$ 600

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - Internal Valuation Model - Significant Unobservable Inputs (Level 3) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)$ / shares
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets and (liabilities)	$ (3,493)
Assumed reinsurance contract
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	$ 582
Assumed reinsurance contract | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share) | $ / shares	$ 101.28
Assumed reinsurance contract | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share) | $ / shares	109.27
Assumed reinsurance contract | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price (in dollars per share) | $ / shares	$ 105.64
Liquidity discount	1.30%
Assumed and ceded (re)insurance contract
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets and (liabilities)	$ (4,075)
Assumed and ceded (re)insurance contract | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period	2 years
Assumed and ceded (re)insurance contract | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period	4 years 8 months 12 days
Assumed and ceded (re)insurance contract | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net undiscounted cash flows	$ (4,733)
Expected loss ratio	24.30%
Net acquisition expense ratio	13.40%
Contract period	4 years 1 month 6 days
Discount rate	1.90%

Fair Value Measurements (Asse48

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period		$ (2,680)		$ 1,719
Total realized and unrealized gains
Purchases		(10,127)		(10,700)
Settlements				(7,500)
Balance at end of the period		(12,012)		(12,012)
Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)				(118)
Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)		795		4,587
Other assets and (liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ (9,502)	(2,680)	$ (13,004)	(5,899)
Total realized and unrealized gains
Purchases	(63)	(10,127)	49	(10,700)
Settlements	5,937		5,937	0
Balance at end of the period	(3,493)	(12,012)	(3,493)	(12,012)
Other assets and (liabilities) | Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)				0
Other assets and (liabilities) | Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)	$ 135	795	$ 3,525	4,587
Fixed maturity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period		0		7,618
Total realized and unrealized gains
Purchases		0		0
Settlements				(7,500)
Balance at end of the period		0		0
Fixed maturity investments | Net investment income
Total realized and unrealized gains
Total realized and unrealized gains (losses)				(118)
Fixed maturity investments | Other income (loss)
Total realized and unrealized gains
Total realized and unrealized gains (losses)		$ 0		$ 0

Fair Value Measurements (Summar

Fair Value Measurements (Summary Of The Balances Company Has Elected To Account For At Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Other investments	$ 548,492	$ 549,805
Other assets	2,383	4,379
Other liabilities	$ 5,876	$ 17,383

Fair Value Measurements (Compan

Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 216,448
Unfunded Commitments	324,240
Private equity partnerships
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	196,280
Unfunded Commitments	300,482
Senior secured bank loan funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	19,572
Unfunded Commitments	23,758
Hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	596
Unfunded Commitments	$ 0

Reserve for Claims and Claim 51

Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 976,103	$ 813,594
Additional Case Reserves	549,513	291,727
IBNR	3,666,697	1,742,973
Net reserve for claims and claim expenses	5,192,313	2,848,294	$ 2,861,099
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	9,904	6,935
Additional Case Reserves	0	0
IBNR	14,649	18,459
Net reserve for claims and claim expenses	24,553	25,394
Property
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	310,871	214,954
Additional Case Reserves	416,758	186,308
IBNR	1,917,573	226,512
Net reserve for claims and claim expenses	2,645,202	627,774
Casualty and Specialty
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	655,328	591,705
Additional Case Reserves	132,755	105,419
IBNR	1,734,475	1,498,002
Net reserve for claims and claim expenses	$ 2,522,558	$ 2,195,126

Reserve for Claims and Claim 52

Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves as of January 1			$ 2,568,730	$ 2,632,519
Net incurred related to:
Current year	$ 1,209,261	$ 158,360	1,561,027	483,574
Prior years	12,435	(45,785)	(3,663)	(76,644)
Total net incurred	1,221,696	112,575	1,557,364	406,930
Net paid related to:
Current year			158,685	39,971
Prior years			396,411	391,047
Total net paid			555,096	431,018
Foreign exchange			33,011	11,899
Net reserves as of September 30	3,604,009	2,620,330	3,604,009	2,620,330
Reinsurance recoverable as of September 30	1,588,304	240,769	1,588,304	240,769
Gross reserves as of September 30	$ 5,192,313	$ 2,861,099	$ 5,192,313	$ 2,861,099

Reserve for Claims and Claim 53

Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ 12,435	$ (45,785)	$ (3,663)	$ (76,644)
Ogden Rate
Liability for Catastrophe Claims [Line Items]
Discount rate			(0.75%)		2.50%
Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (155)	$ (808)	$ (710)	(805)
Property
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(16,968)	(37,512)
Property | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(843)	0
Property | Large and Small Catastrophe Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(17,811)	(37,512)
Property | Large catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			2,764	(8,015)
Property | April and May U.S. Tornadoes (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,163)	(3,396)
Property | Tohoku Earthquake and Tsunami (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			0	(5,894)
Property | New Zealand Earthquake (2010)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			5,001	8,710
Property | New Zealand Earthquake (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			5,807	0
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(3,881)	(7,435)
Property | Small catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(20,575)	(29,497)
Property | Fort McMurray Wildfire (2016)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(6,386)	0
Property | Tianjin Explosion (2015)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,896)	(6,163)
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(9,293)	(23,334)
Casualty and Specialty
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			14,015	(38,327)
Casualty and Specialty | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(2,462)	(6,118)
Casualty and Specialty | Actuarial methods - actual reported claims lower than expected claims
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(17,004)	(32,209)
Casualty and Specialty | Ogden Rate change
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			$ 33,481	$ 0

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 29, 2017	Jun. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, Fair value	$ 1,034,200			$ 964,800
Debt	$ 989,245			$ 948,663
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.70%
5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument, Interest rate	5.75%
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Debt instrument, Interest rate				7.50%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Debt instrument, Interest rate	4.75%
Senior Notes
Debt Instrument [Line Items]
Long-term debt, Fair value	$ 1,034,244			$ 964,800
Debt	989,245			948,663
Senior Notes | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, Fair value	309,648			291,750
Debt	297,225			296,948
Senior Notes | 5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, Fair value	269,265			270,875
Debt	249,188			248,941
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term debt, Fair value	296,589			0
Debt	295,179			0
Debt instrument, Interest rate		3.45%
Senior Notes | Platinum Underwriters Finance, Inc | Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Long-term debt, Fair value	0			257,500
Debt	0			255,352
Debt instrument, Interest rate			7.50%
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Long-term debt, Fair value	158,742			144,675
Debt	$ 147,653			$ 147,422

Debt and Credit Facilities (Nar

Debt and Credit Facilities (Narrative) (Details)	May 24, 2017USD ($)letter_of_credit	Sep. 30, 2017	Jun. 29, 2017USD ($)	Jun. 01, 2017USD ($)	May 25, 2017USD ($)	May 25, 2017GBP (£)	Dec. 31, 2016
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Senior notes interest rate		3.45%
3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate			3.45%
Debt instrument, Face amount			$ 300,000,000
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Senior notes interest rate							7.50%
Series B 7.50% Senior Notes due 2017 | Platinum Underwriters Finance, Inc | Senior Notes
Debt Instrument [Line Items]
Senior notes interest rate				7.50%
Debt instrument, Face amount				$ 250,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank
Debt Instrument [Line Items]
Number of letters of credit | letter_of_credit	2
Maximum increases in or issuances of borrowing capacity					$ 75,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit
Debt Instrument [Line Items]
Letter of credit aggregate commitment	$ 380,000,000				$ 180,000,000
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Line of Credit | Bank Of Montreal, Citibank Europe and ING Bank | Line Of Credit Two
Debt Instrument [Line Items]
Letter of credit aggregate commitment | £						£ 90,000,000

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Sep. 30, 2017 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 476,239	£ 10,000
Wells Fargo | Uncommitted Standby Letter of Credit Facility | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Credit facilities outstanding	99,168
National Australia Bank Limited | Uncommitted Standby Letter of Credit Facility | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Credit facilities outstanding	4,356
Citibank Europe PLC | Bilateral Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	192,715
Bank Of Montreal, Citibank Europe and ING Bank | Renaissance Reinsurance FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	180,000
Bank Of Montreal, Citibank Europe and ING Bank | Specialty Risks FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding | £		£ 10,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 0

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jul. 01, 2017	Jun. 30, 2017	Jan. 01, 2017	Jun. 30, 2016	Jan. 01, 2016	Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests				$ 1,033,729		$ 1,033,729		$ 1,175,594
Net (loss) income attributable to redeemable noncontrolling interests				(204,277)	$ 35,641	(132,338)	$ 110,867
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests				812,342	983,788	812,342	983,788	$ 994,458		$ 1,019,918		$ 953,443		$ 930,955
Net (loss) income attributable to redeemable noncontrolling interests				$ (195,508)	30,745	$ (127,167)	101,997
Parent company ownership in redeemable noncontrolling interest				23.50%		23.50%		24.00%	23.50%		22.60%		24.00%
Redeemable noncontrolling interest, Net redemptions		$ 75,000	$ 100,000
Redeemable noncontrolling interest, Reserve holdback		7,500	$ 10,000
Noncontrolling interest, change from purchase or sale of interests	$ 12,000	$ 24,000
Sale of shares to redeemable noncontrolling interest				$ 0	0	$ 23,921	43,040
Redemption of shares from redeemable noncontrolling interest				$ 12,068	400	$ 78,870	92,204
DaVinciRe Holdings Ltd. | High
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, Limit				25.00%		25.00%
RenaissanceRe Medici Fund Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests				$ 221,387	180,765	$ 221,387	180,765	$ 181,136		$ 222,165		$ 168,960		$ 115,009
Net (loss) income attributable to redeemable noncontrolling interests				$ (8,769)	4,896	$ (5,171)	8,870
Parent company ownership in redeemable noncontrolling interest				31.60%		31.60%		36.50%
Redemption provision, Notice period						30 days
Sale of shares to redeemable noncontrolling interest				$ 9,391	21,298	$ 72,732	78,615	$ 79,500
Redemption of shares from redeemable noncontrolling interest				$ 1,400	$ 14,389	$ 27,310	$ 21,729	$ 21,700

Noncontrolling Interests (Sched

Noncontrolling Interests (Schedule Of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Activity in redeemable noncontrolling interest
Beginning balance			$ 1,175,594
Net (loss) income attributable to redeemable noncontrolling interest	$ (204,277)	$ 35,641	(132,338)	$ 110,867
Ending balance	1,033,729		1,033,729		$ 1,175,594
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,019,918	953,443	994,458	930,955	930,955
Redemption of shares from redeemable noncontrolling interest	(12,068)	(400)	(78,870)	(92,204)
Sale of shares to redeemable noncontrolling interests	0	0	23,921	43,040
Net (loss) income attributable to redeemable noncontrolling interest	(195,508)	30,745	(127,167)	101,997
Ending balance	812,342	983,788	812,342	983,788	994,458
RenaissanceRe Medici Fund Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	222,165	168,960	181,136	115,009	115,009
Redemption of shares from redeemable noncontrolling interest	(1,400)	(14,389)	(27,310)	(21,729)	(21,700)
Sale of shares to redeemable noncontrolling interests	9,391	21,298	72,732	78,615	79,500
Net (loss) income attributable to redeemable noncontrolling interest	(8,769)	4,896	(5,171)	8,870
Ending balance	$ 221,387	$ 180,765	$ 221,387	$ 180,765	$ 181,136

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 01, 2017	Jan. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Assets			$ 15,044,924		$ 15,044,924		$ 12,352,082
Liabilities			9,608,183		9,608,183		6,309,911
Ceded premiums written			157,048	$ 146,002	806,672	$ 735,672
Ceded premiums earned			226,615	$ 167,673	612,176	454,922
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.
Variable Interest Entity [Line Items]
Return of capital					84,300		242,500
Assets			453,800		453,800		193,000
Liabilities			453,900		453,900		193,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Issuance of equity to third party investors					134,100		166,600
Contributions to subsidiaries					9,500		55,200
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Return of capital					$ 33,000		$ 59,800
Variable interest entity, ownership percentage					10.10%		28.80%
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries					$ 7,500
Variable Interest Entity, Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					9,400
Ceded premiums earned					6,200
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Issuance of equity to third party investors	$ 45,000	$ 140,000
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other Investments
Variable Interest Entity [Line Items]
Investment in participating notes			16,300		16,300
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd
Variable Interest Entity [Line Items]
Assets			26,100		26,100		$ 184,200
Liabilities			$ 26,100		26,100		$ 184,200
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					200	7,400
Ceded premiums earned					4,000	5,400
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | DaVinci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					224	5,100
Ceded premiums earned					$ 2,800	$ 3,700

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions	Sep. 29, 2017	Sep. 15, 2017	Jun. 30, 2017	Jun. 15, 2017	Mar. 31, 2017	Mar. 15, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 02, 2017
Class of Stock [Line Items]
Dividends per common share (in dollars per share)							$ 0.32	$ 0.31	$ 0.96	$ 0.93
Dividends declared and paid, Preference shares							$ 5,595,000	$ 5,595,000	$ 16,786,000	$ 16,786,000
Retained Earnings
Class of Stock [Line Items]
Dividends declared and paid, Preference shares									16,786,000	16,786,000
Dividends declared and paid, Common shares									$ 38,624,000	$ 38,886,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.32		$ 0.32		$ 0.32
Dividends paid per common share (in dollars per share)	$ 0.32		$ 0.32		$ 0.32
Share repurchase program, Authorized amount											$ 500,000,000
Common shares repurchased during period, Number of shares (in shares)									1.3
Common shares repurchased during period, Aggregate amount									$ 188,600,000
Common shares repurchased during period, Average cost (in dollars per share)									$ 142.67
Share repurchase program, Remaining authorized aggregate amount							$ 467,300,000		$ 467,300,000
Series C Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage									6.08%
Liquidation preference per annum (in dollars per share)							$ 1.52		$ 1.52
Liquidation preference quarterly (in dollars per share)							0.38		$ 0.38
Series E Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage									5.375%
Liquidation preference per annum (in dollars per share)							1.34375		$ 1.34375
Liquidation preference quarterly (in dollars per share)							$ 0.3359375		$ 0.3359375

Earnings Per Share (Computation

Earnings Per Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net (loss) income (attributable) available to RenaissanceRe common shareholders	$ (504,812)	$ 146,825	$ (241,318)	$ 411,145
Amount allocated to participating common shareholders	(116)	(1,770)	(344)	(4,939)
Net (loss) income allocated to RenaissanceRe common shareholders	$ (504,928)	$ 145,055	$ (241,662)	$ 406,206
Denominator:
Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares	39,591	40,513	39,979	41,594
Per common share equivalents of employee stock options and restricted shares (in shares)	0	220	0	248
Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	39,591	40,733	39,979	41,842
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ (12.75)	$ 3.58	$ (6.04)	$ 9.77
Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ (12.75)	$ 3.56	$ (6.04)	$ 9.71

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Significant Components Of The Company's Revenues And Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Gross premiums written	$ 640,269	$ 430,224	$ 2,389,774	$ 2,051,485
Net premiums written	483,221	284,222	1,583,102	1,315,813
Net premiums earned	547,792	346,521	1,296,102	1,051,529
Net claims and claim expenses incurred	1,221,696	112,575	1,557,364	406,930
Acquisition expenses	76,761	80,580	248,294	215,177
Operational expenses	42,537	40,493	131,586	147,801
Underwriting (loss) income	(793,202)	112,873	(641,142)	281,621
Net investment income	40,257	51,423	148,745	134,410
Net foreign exchange (losses) gains	(156)	(5,986)	11,118	(8,368)
Equity in earnings (losses) of other ventures	1,794	(11,630)	5,830	(3,997)
Other income	2,996	2,268	7,053	9,001
Net realized and unrealized gains on investments	42,052	59,870	143,538	191,295
Corporate expenses	(4,413)	(11,537)	(14,335)	(25,514)
Interest expense	(11,799)	(10,536)	(32,416)	(31,610)
(Loss) income before taxes	(722,471)	186,745	(371,609)	546,838
Income tax benefit (expense)	18,977	1,316	14,739	(8,040)
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders	(504,812)	146,825	(241,318)	411,145
Net claims and claim expenses incurred – current accident year	1,209,261	158,360	1,561,027	483,574
Net claims and claim expenses incurred – prior accident years	12,435	(45,785)	(3,663)	(76,644)
Total net incurred	$ 1,221,696	$ 112,575	$ 1,557,364	$ 406,930
Net claims and claim expense ratio – current accident year	220.80%	45.70%	120.40%	46.00%
Net claims and claim expense ratio – prior accident years	2.20%	(13.20%)	(0.20%)	(7.30%)
Net claims and claim expense ratio – calendar year	223.00%	32.50%	120.20%	38.70%
Underwriting expense ratio	21.80%	34.90%	29.30%	34.50%
Combined ratio	244.80%	67.40%	149.50%	73.20%
Other
Segment Reporting Information [Line Items]
Gross premiums written	$ (7)	$ 0	$ (7)	$ 0
Net premiums written	(7)	0	(7)	0
Net premiums earned	(7)	0	(7)	0
Net claims and claim expenses incurred	(155)	(808)	(710)	(805)
Acquisition expenses	(1)	0	(2)	0
Operational expenses	25	18	37	99
Underwriting (loss) income	124	790	668	706
Net investment income	40,257	51,423	148,745	134,410
Net foreign exchange (losses) gains	(156)	(5,986)	11,118	(8,368)
Equity in earnings (losses) of other ventures	1,794	(11,630)	5,830	(3,997)
Other income	2,996	2,268	7,053	9,001
Net realized and unrealized gains on investments	42,052	59,870	143,538	191,295
Corporate expenses	(4,413)	(11,537)	(14,335)	(25,514)
Interest expense	(11,799)	(10,536)	(32,416)	(31,610)
Income tax benefit (expense)	18,977	1,316	14,739	(8,040)
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net claims and claim expenses incurred – current accident year	0	0	0	0
Net claims and claim expenses incurred – prior accident years	(155)	(808)	(710)	(805)
Total net incurred	(155)	(808)	(710)	(805)
Property
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			(16,968)	(37,512)
Property | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	325,395	119,904	1,345,271	1,058,816
Net premiums written	269,393	90,909	895,728	674,361
Net premiums earned	336,838	172,661	716,024	538,953
Net claims and claim expenses incurred	1,044,418	23,539	1,116,273	125,618
Acquisition expenses	17,514	21,663	75,117	71,176
Operational expenses	25,123	24,258	76,841	79,441
Underwriting (loss) income	(750,217)	103,201	(552,207)	262,718
Net claims and claim expenses incurred – current accident year	1,036,586	42,062	1,133,241	163,130
Net claims and claim expenses incurred – prior accident years	7,832	(18,523)	(16,968)	(37,512)
Total net incurred	$ 1,044,418	$ 23,539	$ 1,116,273	$ 125,618
Net claims and claim expense ratio – current accident year	307.70%	24.40%	158.30%	30.30%
Net claims and claim expense ratio – prior accident years	2.40%	(10.80%)	(2.40%)	(7.00%)
Net claims and claim expense ratio – calendar year	310.10%	13.60%	155.90%	23.30%
Underwriting expense ratio	12.60%	26.60%	21.20%	28.00%
Combined ratio	322.70%	40.20%	177.10%	51.30%
Casualty and Specialty
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			$ 14,015	$ (38,327)
Casualty and Specialty | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	$ 314,881	$ 310,320	1,044,510	992,669
Net premiums written	213,835	193,313	687,381	641,452
Net premiums earned	210,961	173,860	580,085	512,576
Net claims and claim expenses incurred	177,433	89,844	441,801	282,117
Acquisition expenses	59,248	58,917	173,179	144,001
Operational expenses	17,389	16,217	54,708	68,261
Underwriting (loss) income	(43,109)	8,882	(89,603)	18,197
Net claims and claim expenses incurred – current accident year	172,675	116,298	427,786	320,444
Net claims and claim expenses incurred – prior accident years	4,758	(26,454)	14,015	(38,327)
Total net incurred	$ 177,433	$ 89,844	$ 441,801	$ 282,117
Net claims and claim expense ratio – current accident year	81.90%	66.90%	73.70%	62.50%
Net claims and claim expense ratio – prior accident years	2.20%	(15.20%)	2.50%	(7.50%)
Net claims and claim expense ratio – calendar year	84.10%	51.70%	76.20%	55.00%
Underwriting expense ratio	36.30%	43.20%	39.20%	41.40%
Combined ratio	120.40%	94.90%	115.40%	96.40%

Derivative Instruments (Consoli

Derivative Instruments (Consolidated Balance Sheets And Fair Value Of The Principal Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other assets
Derivative Assets
Gross Amounts of Recognized Assets	$ 7,048	$ 4,208
Gross Amounts Offset in the Balance Sheet	1,770	1,705
Net Amounts of Assets Presented in the Balance Sheet	5,278	2,503
Collateral	0	0
Net Amount	5,278	2,503
Other assets | Interest rate futures
Derivative Assets
Gross Amounts of Recognized Assets	740	1,384
Gross Amounts Offset in the Balance Sheet	614	1,235
Net Amounts of Assets Presented in the Balance Sheet	126	149
Collateral	0	0
Net Amount	126	149
Other assets | Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	551
Gross Amounts Offset in the Balance Sheet	277
Net Amounts of Assets Presented in the Balance Sheet	274
Collateral	0
Net Amount	274
Other assets | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
Derivative Assets
Gross Amounts of Recognized Assets	4,758	774
Gross Amounts Offset in the Balance Sheet	557	0
Net Amounts of Assets Presented in the Balance Sheet	4,201	774
Collateral	0	0
Net Amount	4,201	774
Other assets | Foreign Currency Forward Contracts, Investment Operations
Derivative Assets
Gross Amounts of Recognized Assets	43	621
Gross Amounts Offset in the Balance Sheet	14	447
Net Amounts of Assets Presented in the Balance Sheet	29	174
Collateral	0	0
Net Amount	29	174
Other assets | Credit default swaps
Derivative Assets
Gross Amounts of Recognized Assets	956	1,429
Gross Amounts Offset in the Balance Sheet	308	23
Net Amounts of Assets Presented in the Balance Sheet	648	1,406
Collateral	0	0
Net Amount	648	1,406
Other liabilities
Derivative Liabilities
Gross Amounts of Recognized Liabilities	4,547	13,527
Gross Amounts Offset in the Balance Sheet	1,213	2,102
Net Amounts of Liabilities Presented in the Balance Sheet	3,334	11,425
Collateral Pledged	243	789
Net Amount	3,091	10,636
Other liabilities | Interest rate futures
Derivative Liabilities
Gross Amounts of Recognized Liabilities	854	2,030
Gross Amounts Offset in the Balance Sheet	614	1,235
Net Amounts of Liabilities Presented in the Balance Sheet	240	795
Collateral Pledged	240	789
Net Amount	0	6
Other liabilities | Interest rate swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	280
Gross Amounts Offset in the Balance Sheet	277
Net Amounts of Liabilities Presented in the Balance Sheet	3
Collateral Pledged	3
Net Amount	0
Other liabilities | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	2,996	10,550
Gross Amounts Offset in the Balance Sheet	0	397
Net Amounts of Liabilities Presented in the Balance Sheet	2,996	10,153
Collateral Pledged	0	0
Net Amount	2,996	10,153
Other liabilities | Foreign Currency Forward Contracts, Investment Operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	90	766
Gross Amounts Offset in the Balance Sheet	14	447
Net Amounts of Liabilities Presented in the Balance Sheet	76	319
Collateral Pledged	0	0
Net Amount	76	319
Other liabilities | Credit default swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	327	181
Gross Amounts Offset in the Balance Sheet	308	23
Net Amounts of Liabilities Presented in the Balance Sheet	19	158
Collateral Pledged	0	0
Net Amount	$ 19	$ 158

Derivative Instruments (Gain (L

Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ (2,004)	$ 6,335	$ 3,055	$ (30,671)
Net realized and unrealized gains on investments | Interest rate futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(3,016)	1,040	(4,064)	(27,775)
Net realized and unrealized gains on investments | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	271	0	271	0
Net realized and unrealized gains on investments | Credit default swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(1,275)	687	(551)	902
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	2,056	5,097	8,339	(92)
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ (40)	$ (489)	$ (940)	$ (3,706)

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Interest rate futures | Long
Derivative [Line Items]
Notional amount	$ 1,100,000,000	$ 1,200,000,000
Interest rate futures | Short
Derivative [Line Items]
Notional amount	399,700,000	727,900,000
Interest rate swaps | Paying a Fixed Rate | US Dollars
Derivative [Line Items]
Notional amount	51,300,000
Interest rate swaps | Receiving a Fixed Rate | US Dollars
Derivative [Line Items]
Notional amount	5,300,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Long
Derivative [Line Items]
Notional amount	191,100,000	184,200,000
Foreign Currency Forward Contracts, Underwriting and Non-investment Operations | Short
Derivative [Line Items]
Notional amount	68,500,000	91,400,000
Foreign Currency Forward Contracts, Investment Operations | Long
Derivative [Line Items]
Notional amount	17,600,000	26,900,000
Foreign Currency Forward Contracts, Investment Operations | Short
Derivative [Line Items]
Notional amount	4,500,000	57,300,000
Credit default swaps | Long
Derivative [Line Items]
Notional amount	15,500,000	0
Credit default swaps | Short
Derivative [Line Items]
Notional amount	$ 13,300,000	$ 75,200,000

Condensed Consolidating Finan66

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Assets
Total investments	$ 9,642,178	$ 9,316,968
Cash and cash equivalents	581,576	421,157	$ 493,330	$ 506,885
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,521,266	987,323
Prepaid reinsurance premiums	635,756	441,260
Reinsurance recoverable	1,588,304	279,564	240,769
Accrued investment income	38,366	38,076
Deferred acquisition costs	434,914	335,325
Receivable for investments sold	193,758	105,841
Other assets	164,019	175,382
Goodwill and other intangible assets	244,787	251,186
Total assets	15,044,924	12,352,082
Liabilities
Reserve for claims and claim expenses	5,192,313	2,848,294	2,861,099
Unearned premiums	1,713,069	1,231,573
Debt	989,245	948,663
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	1,034,454	673,983
Payable for investments purchased	377,543	305,714
Other liabilities	301,559	301,684
Total liabilities	9,608,183	6,309,911
Redeemable noncontrolling interests	1,033,729	1,175,594
Shareholders’ Equity
Total shareholders’ equity	4,403,012	4,866,577	4,807,790
Total liabilities, noncontrolling interests and shareholders’ equity	15,044,924	12,352,082
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Assets
Total investments	130,802	119,163
Cash and cash equivalents	226	162	857	5,908
Investments in subsidiaries	37,834	34,761
Due from subsidiaries and affiliates	91,891	91,892
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	197	289
Deferred acquisition costs	0	0
Receivable for investments sold	13,472	2
Other assets	36,825	37,204
Goodwill and other intangible assets	0	0
Total assets	311,247	283,473
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	55	42
Reinsurance balances payable	0	0
Payable for investments purchased	17,938	0
Other liabilities	927	10,544
Total liabilities	18,920	10,586
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	292,327	272,887
Total liabilities, noncontrolling interests and shareholders’ equity	311,247	283,473
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	0	267,556
Cash and cash equivalents	10	6,671	1,745	7,103
Investments in subsidiaries	0	843,089
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	551
Deferred acquisition costs	0	0
Receivable for investments sold	0	99
Other assets	0	4,689
Goodwill and other intangible assets	0	0
Total assets	10	1,122,655
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	255,352
Amounts due to subsidiaries and affiliates	0	123
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	0	0
Total liabilities	0	255,475
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	10	867,180
Total liabilities, noncontrolling interests and shareholders’ equity	10	1,122,655
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Assets
Total investments	35,098	45,027
Cash and cash equivalents	7,663	9,397	2,530	677
Investments in subsidiaries	1,152,247	1,165,413
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	59	106
Deferred acquisition costs	0	0
Receivable for investments sold	101	45
Other assets	435,815	127,572
Goodwill and other intangible assets	0	0
Total assets	1,630,983	1,347,560
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	841,592	545,889
Amounts due to subsidiaries and affiliates	97,365	96,061
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	9,926	13,350
Total liabilities	948,883	655,300
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	682,100	692,260
Total liabilities, noncontrolling interests and shareholders’ equity	1,630,983	1,347,560
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	193,268	387,274
Cash and cash equivalents	12,370	7,067	10,147	10,185
Investments in subsidiaries	3,968,721	4,074,769
Due from subsidiaries and affiliates	107,746	7,413
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	125	105
Deferred acquisition costs	0	0
Receivable for investments sold	9,042	136
Other assets	429,594	410,757
Goodwill and other intangible assets	126,246	130,407
Total assets	4,847,112	5,017,928
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	417,000	117,000
Amounts due to subsidiaries and affiliates	2,950	14,644
Reinsurance balances payable	0	0
Payable for investments purchased	8,989	0
Other liabilities	15,161	19,707
Total liabilities	444,100	151,351
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	4,403,012	4,866,577
Total liabilities, noncontrolling interests and shareholders’ equity	4,847,112	5,017,928
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	9,283,010	8,497,948
Cash and cash equivalents	561,307	397,860	$ 478,051	$ 483,012
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	1,521,266	987,323
Prepaid reinsurance premiums	635,756	441,260
Reinsurance recoverable	1,588,304	279,564
Accrued investment income	37,985	37,025
Deferred acquisition costs	434,914	335,325
Receivable for investments sold	171,143	105,559
Other assets	98,023	118,098
Goodwill and other intangible assets	118,541	120,779
Total assets	14,450,249	11,320,741
Liabilities
Reserve for claims and claim expenses	5,192,313	2,848,294
Unearned premiums	1,713,069	1,231,573
Debt	147,653	147,422
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	1,034,454	673,983
Payable for investments purchased	350,616	305,714
Other liabilities	282,647	270,610
Total liabilities	8,720,752	5,477,596
Redeemable noncontrolling interests	1,033,729	1,175,594
Shareholders’ Equity
Total shareholders’ equity	4,695,768	4,667,551
Total liabilities, noncontrolling interests and shareholders’ equity	14,450,249	11,320,741
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(5,158,802)	(6,118,032)
Due from subsidiaries and affiliates	(199,637)	(99,305)
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	0	0
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	(836,238)	(522,938)
Goodwill and other intangible assets	0	0
Total assets	(6,194,677)	(6,740,275)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	(417,000)	(117,000)
Amounts due to subsidiaries and affiliates	(100,370)	(110,870)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(7,102)	(12,527)
Total liabilities	(524,472)	(240,397)
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	(5,670,205)	(6,499,878)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (6,194,677)	$ (6,740,275)

Condensed Consolidating Finan67

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Net premiums earned	$ 547,792	$ 346,521	$ 1,296,102	$ 1,051,529
Net investment income (loss)	40,257	51,423	148,745	134,410
Net foreign exchange (losses) gains	(156)	(5,986)	11,118	(8,368)
Equity in earnings (losses) of other ventures	1,794	(11,630)	5,830	(3,997)
Other income (loss)	2,996	2,268	7,053	9,001
Net realized and unrealized gains (losses) on investments	42,052	59,870	143,538	191,295
Total revenues	634,735	442,466	1,612,386	1,373,870
Expenses
Net claims and claim expenses incurred	1,221,696	112,575	1,557,364	406,930
Acquisition expenses	76,761	80,580	248,294	215,177
Operational expenses	42,537	40,493	131,586	147,801
Corporate expenses	4,413	11,537	14,335	25,514
Interest expense	11,799	10,536	32,416	31,610
Total expenses	1,357,206	255,721	1,983,995	827,032
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(722,471)	186,745	(371,609)	546,838
Equity in net income (loss) of subsidiaries	0	0	0	0
(Loss) income before taxes	(722,471)	186,745	(371,609)	546,838
Income tax benefit (expense)	18,977	1,316	14,739	(8,040)
Net (loss) income	(703,494)	188,061	(356,870)	538,798
Net loss attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Net (loss) income attributable to RenaissanceRe	(499,217)	152,420	(224,532)	427,931
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders	(504,812)	146,825	(241,318)	411,145
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income (loss)	544	441	1,436	1,395
Net foreign exchange (losses) gains	0	0	0	0
Equity in earnings (losses) of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	2,186	1,397	6,528	3,651
Total revenues	2,730	1,838	7,964	5,046
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	17	36	57	(61)
Corporate expenses	0	0	0	203
Interest expense	0	0	0	0
Total expenses	17	36	57	142
(Loss) income before equity in net income (loss) of subsidiaries and taxes	2,713	1,802	7,907	4,904
Equity in net income (loss) of subsidiaries	928	1,463	3,234	2,996
(Loss) income before taxes	3,641	3,265	11,141	7,900
Income tax benefit (expense)	(890)	(324)	(2,572)	(1,791)
Net (loss) income	2,751	2,941	8,569	6,109
Net loss attributable to redeemable noncontrolling interests	0	0	0	0
Net (loss) income attributable to RenaissanceRe	2,751	2,941	8,569	6,109
Dividends on preference shares	0	0	0	0
Net (loss) income (attributable) available to RenaissanceRe common shareholders	2,751	2,941	8,569	6,109
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income (loss)	(3)	795	1,373	3,074
Net foreign exchange (losses) gains	0	0	0	0
Equity in earnings (losses) of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	0	2,105	4,916	7,483
Total revenues	(3)	2,900	6,289	10,557
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	1	60	86	176
Corporate expenses	0	0	0	0
Interest expense	0	1,476	2,461	4,429
Total expenses	1	1,536	2,547	4,605
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(4)	1,364	3,742	5,952
Equity in net income (loss) of subsidiaries	0	(2,694)	28,028	31,727
(Loss) income before taxes	(4)	(1,330)	31,770	37,679
Income tax benefit (expense)	29	(401)	(1,175)	(1,583)
Net (loss) income	25	(1,731)	30,595	36,096
Net loss attributable to redeemable noncontrolling interests	0	0	0	0
Net (loss) income attributable to RenaissanceRe	25	(1,731)	30,595	36,096
Dividends on preference shares	0	0	0	0
Net (loss) income (attributable) available to RenaissanceRe common shareholders	25	(1,731)	30,595	36,096
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income (loss)	1,335	140	1,843	421
Net foreign exchange (losses) gains	0	0	0	0
Equity in earnings (losses) of other ventures	38	0	(412)	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	51	0	(217)	0
Total revenues	1,424	140	1,214	421
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	6,266	5,021	20,892	16,603
Corporate expenses	0	0	0	7
Interest expense	9,258	6,545	22,401	19,632
Total expenses	15,524	11,566	43,293	36,242
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(14,100)	(11,426)	(42,079)	(35,821)
Equity in net income (loss) of subsidiaries	(16,352)	1,130	20,584	42,774
(Loss) income before taxes	(30,452)	(10,296)	(21,495)	6,953
Income tax benefit (expense)	3,307	2,785	9,281	8,456
Net (loss) income	(27,145)	(7,511)	(12,214)	15,409
Net loss attributable to redeemable noncontrolling interests	0	0	0	0
Net (loss) income attributable to RenaissanceRe	(27,145)	(7,511)	(12,214)	15,409
Dividends on preference shares	0	0	0	0
Net (loss) income (attributable) available to RenaissanceRe common shareholders	(27,145)	(7,511)	(12,214)	15,409
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Revenues
Net premiums earned	0	0	0	0
Net investment income (loss)	5,725	5,892	16,466	18,499
Net foreign exchange (losses) gains	0	0	(1)	(2)
Equity in earnings (losses) of other ventures	0	0	0	0
Other income (loss)	1	21	0	(770)
Net realized and unrealized gains (losses) on investments	110	(336)	155	4,951
Total revenues	5,836	5,577	16,620	22,678
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	2,910	(1,233)	9,398	(3,038)
Corporate expenses	4,634	11,617	14,640	22,411
Interest expense	183	140	464	421
Total expenses	7,727	10,524	24,502	19,794
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(1,891)	(4,947)	(7,882)	2,884
Equity in net income (loss) of subsidiaries	(499,408)	158,862	(219,309)	424,077
(Loss) income before taxes	(501,299)	153,915	(227,191)	426,961
Income tax benefit (expense)	2,082	(1,495)	2,659	970
Net (loss) income	(499,217)	152,420	(224,532)	427,931
Net loss attributable to redeemable noncontrolling interests	0	0	0	0
Net (loss) income attributable to RenaissanceRe	(499,217)	152,420	(224,532)	427,931
Dividends on preference shares	(5,595)	(5,595)	(16,786)	(16,786)
Net (loss) income (attributable) available to RenaissanceRe common shareholders	(504,812)	146,825	(241,318)	411,145
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Revenues
Net premiums earned	547,792	346,521	1,296,102	1,051,529
Net investment income (loss)	39,342	50,406	146,816	129,038
Net foreign exchange (losses) gains	(156)	(5,986)	11,119	(8,366)
Equity in earnings (losses) of other ventures	1,756	(11,630)	6,242	(3,997)
Other income (loss)	2,995	2,247	7,053	9,771
Net realized and unrealized gains (losses) on investments	39,705	56,704	132,156	175,210
Total revenues	631,434	438,262	1,599,488	1,353,185
Expenses
Net claims and claim expenses incurred	1,221,696	112,575	1,557,364	406,930
Acquisition expenses	76,761	80,580	248,294	215,177
Operational expenses	37,752	40,018	116,212	145,466
Corporate expenses	(221)	(80)	(305)	2,893
Interest expense	2,541	2,515	7,554	7,549
Total expenses	1,338,529	235,608	1,929,119	778,015
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(707,095)	202,654	(329,631)	575,170
Equity in net income (loss) of subsidiaries	0	0	0	0
(Loss) income before taxes	(707,095)	202,654	(329,631)	575,170
Income tax benefit (expense)	14,449	751	6,546	(14,092)
Net (loss) income	(692,646)	203,405	(323,085)	561,078
Net loss attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Net (loss) income attributable to RenaissanceRe	(488,369)	167,764	(190,747)	450,211
Dividends on preference shares	0	0	0	0
Net (loss) income (attributable) available to RenaissanceRe common shareholders	(488,369)	167,764	(190,747)	450,211
Consolidating Adjustments
Revenues
Net premiums earned	0	0	0	0
Net investment income (loss)	(6,686)	(6,251)	(19,189)	(18,017)
Net foreign exchange (losses) gains	0	0	0	0
Equity in earnings (losses) of other ventures	0	0	0	0
Other income (loss)	0	0	0	0
Net realized and unrealized gains (losses) on investments	0	0	0	0
Total revenues	(6,686)	(6,251)	(19,189)	(18,017)
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	(4,409)	(3,409)	(15,059)	(11,345)
Corporate expenses	0	0	0	0
Interest expense	(183)	(140)	(464)	(421)
Total expenses	(4,592)	(3,549)	(15,523)	(11,766)
(Loss) income before equity in net income (loss) of subsidiaries and taxes	(2,094)	(2,702)	(3,666)	(6,251)
Equity in net income (loss) of subsidiaries	514,832	(158,761)	167,463	(501,574)
(Loss) income before taxes	512,738	(161,463)	163,797	(507,825)
Income tax benefit (expense)	0	0	0	0
Net (loss) income	512,738	(161,463)	163,797	(507,825)
Net loss attributable to redeemable noncontrolling interests	0	0	0	0
Net (loss) income attributable to RenaissanceRe	512,738	(161,463)	163,797	(507,825)
Dividends on preference shares	0	0	0	0
Net (loss) income (attributable) available to RenaissanceRe common shareholders	$ 512,738	$ (161,463)	$ 163,797	$ (507,825)

Condensed Consolidating Finan68

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	$ (703,494)	$ 188,061	$ (356,870)	$ 538,798
Change in net unrealized gains on investments	300	284	(972)	513
Comprehensive (loss) income	(703,194)	188,345	(357,842)	539,311
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive loss attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive (loss) income attributable to RenaissanceRe	(498,917)	152,704	(225,504)	428,444
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	2,751	2,941	8,569	6,109
Change in net unrealized gains on investments	0	0	0	0
Comprehensive (loss) income	2,751	2,941	8,569	6,109
Net loss (income) attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (loss) income attributable to RenaissanceRe	2,751	2,941	8,569	6,109
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	25	(1,731)	30,595	36,096
Change in net unrealized gains on investments	0	0	0	0
Comprehensive (loss) income	25	(1,731)	30,595	36,096
Net loss (income) attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (loss) income attributable to RenaissanceRe	25	(1,731)	30,595	36,096
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	(27,145)	(7,511)	(12,214)	15,409
Change in net unrealized gains on investments	0	0	0	0
Comprehensive (loss) income	(27,145)	(7,511)	(12,214)	15,409
Net loss (income) attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (loss) income attributable to RenaissanceRe	(27,145)	(7,511)	(12,214)	15,409
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	(499,217)	152,420	(224,532)	427,931
Change in net unrealized gains on investments	0	0	0	0
Comprehensive (loss) income	(499,217)	152,420	(224,532)	427,931
Net loss (income) attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (loss) income attributable to RenaissanceRe	(499,217)	152,420	(224,532)	427,931
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	(692,646)	203,405	(323,085)	561,078
Change in net unrealized gains on investments	300	284	(972)	513
Comprehensive (loss) income	(692,346)	203,689	(324,057)	561,591
Net loss (income) attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive loss attributable to redeemable noncontrolling interests	204,277	(35,641)	132,338	(110,867)
Comprehensive (loss) income attributable to RenaissanceRe	(488,069)	168,048	(191,719)	450,724
Consolidating Adjustments
Condensed Financial Statements, Captions [Line Items]
Net (loss) income	512,738	(161,463)	163,797	(507,825)
Change in net unrealized gains on investments	0	0	0	0
Comprehensive (loss) income	512,738	(161,463)	163,797	(507,825)
Net loss (income) attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive (loss) income attributable to RenaissanceRe	$ 512,738	$ (161,463)	$ 163,797	$ (507,825)

Condensed Consolidating Finan69

Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$ 621,702	$ 380,365
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	7,663,002	6,509,019
Purchases of fixed maturity investments trading	(7,798,285)	(6,744,838)
Proceeds from sales and maturities of fixed maturity investments available for sale	0	5,931
Net sales of equity investments trading	61,571	183,112
Net (purchases) sales of short term investments	(146,326)	128,869
Net sales (purchases) of other investments	5,181	(56,765)
Net sales of other assets	0	400
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due to (from) subsidiary	0	0
Net cash (used in) provided by investing activities	(214,857)	25,728
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(38,624)	(38,886)
Dividends paid – preference shares	(16,786)	(16,786)
RenaissanceRe common share repurchases	(188,591)	(309,434)
Issuance of debt, net of expenses	295,866	0
Repayment of debt	(250,000)	0
Net third party redeemable noncontrolling interest share transactions	(44,193)	(45,496)
Taxes paid on withholding shares	(13,694)	(10,362)
Net cash used in financing activities	(256,022)	(420,964)
Effect of exchange rate changes on foreign currency cash	9,596	1,316
Net increase (decrease) in cash and cash equivalents	160,419	(13,555)
Cash and cash equivalents, beginning of period	421,157	506,885
Cash and cash equivalents, end of period	581,576	493,330
RenRe North America Holdings Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	0
Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	(250,000)
RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows used in financing activities
Repayment of debt	0
RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows used in financing activities
Repayment of debt	0
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)
Cash flows used in financing activities
Repayment of debt	0
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	(8,209)	1,847
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	74,455	62,959
Purchases of fixed maturity investments trading	(69,168)	(115,849)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	(1,708)	(2,392)
Net (purchases) sales of short term investments	(4,495)	67,986
Net sales (purchases) of other investments	0	0
Net sales of other assets		0
Dividends and return of capital from subsidiaries	9,175	2,900
Contributions to subsidiaries	0	0
Due to (from) subsidiary	14	(22,502)
Net cash (used in) provided by investing activities	8,273	(6,898)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash 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	64	(5,051)
Cash and cash equivalents, beginning of period	162	5,908
Cash and cash equivalents, end of period	226	857
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(2,262)	(11,062)
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	289,741	113,947
Purchases of fixed maturity investments trading	(143,991)	(259,165)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	85,324	192,911
Net (purchases) sales of short term investments	41,299	(41,881)
Net sales (purchases) of other investments	0	0
Net sales of other assets		0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	(26,649)	0
Due to (from) subsidiary	(123)	(108)
Net cash (used in) provided by investing activities	245,601	5,704
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash used in financing activities	(250,000)	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(6,661)	(5,358)
Cash and cash equivalents, beginning of period	6,671	7,103
Cash and cash equivalents, end of period	10	1,745
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(343,093)	(35,171)
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	279,830	0
Purchases of fixed maturity investments trading	(270,785)	0
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	0	0
Net (purchases) sales of short term investments	(305)	0
Net sales (purchases) of other investments	0	0
Net sales of other assets		0
Dividends and return of capital from subsidiaries	41,866	9,300
Contributions to subsidiaries	(9,175)	0
Due to (from) subsidiary	4,062	27,724
Net cash (used in) provided by investing activities	45,493	37,024
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	295,866
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash used in financing activities	295,866	0
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	(1,734)	1,853
Cash and cash equivalents, beginning of period	9,397	677
Cash and cash equivalents, end of period	7,663	2,530
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(6,870)	(7,644)
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	106,761	272,710
Purchases of fixed maturity investments trading	(118,402)	(336,345)
Proceeds from sales and maturities of fixed maturity investments available for sale		0
Net sales of equity investments trading	0	0
Net (purchases) sales of short term investments	205,864	122,656
Net sales (purchases) of other investments	0	0
Net sales of other assets		0
Dividends and return of capital from subsidiaries	285,515	408,189
Contributions to subsidiaries	(500,000)	(91,001)
Due to (from) subsidiary	290,130	(3,497)
Net cash (used in) provided by investing activities	269,868	372,712
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(38,624)	(38,886)
Dividends paid – preference shares	(16,786)	(16,786)
RenaissanceRe common share repurchases	(188,591)	(309,434)
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(13,694)	0
Net cash used in financing activities	(257,695)	(365,106)
Effect of exchange rate changes on foreign currency cash	0	0
Net increase (decrease) in cash and cash equivalents	5,303	(38)
Cash and cash equivalents, beginning of period	7,067	10,185
Cash and cash equivalents, end of period	12,370	10,147
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	982,136	432,395
Cash flows (used in) provided by investing activities
Proceeds from sales and maturities of fixed maturity investments trading	6,912,215	6,059,403
Purchases of fixed maturity investments trading	(7,195,939)	(6,033,479)
Proceeds from sales and maturities of fixed maturity investments available for sale		5,931
Net sales of equity investments trading	(22,045)	(7,407)
Net (purchases) sales of short term investments	(388,689)	(19,892)
Net sales (purchases) of other investments	5,181	(56,765)
Net sales of other assets		400
Dividends and return of capital from subsidiaries	(336,556)	(420,389)
Contributions to subsidiaries	535,824	91,001
Due to (from) subsidiary	(294,083)	(1,617)
Net cash (used in) provided by investing activities	(784,092)	(382,814)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
RenaissanceRe common share repurchases	0	0
Issuance of debt, net of expenses	0
Net third party redeemable noncontrolling interest share transactions	(44,193)	(45,496)
Taxes paid on withholding shares	0	(10,362)
Net cash used in financing activities	(44,193)	(55,858)
Effect of exchange rate changes on foreign currency cash	9,596	1,316
Net increase (decrease) in cash and cash equivalents	163,447	(4,961)
Cash and cash equivalents, beginning of period	397,860	483,012
Cash and cash equivalents, end of period	$ 561,307	$ 478,051

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Millions	Oct. 01, 2017	Jul. 31, 2017	Jan. 31, 2017	Sep. 30, 2017	Dec. 31, 2016	Jul. 01, 2017	Jan. 01, 2017	Jan. 01, 2016
DaVinciRe Holdings Ltd.
Subsequent Event [Line Items]
Noncontrolling interest, change from purchase or sale of interests		$ 12	$ 24
Parent company ownership in redeemable noncontrolling interest				23.50%	24.00%	23.50%	22.60%	24.00%
DaVinciRe Holdings Ltd. | Subsequent Event
Subsequent Event [Line Items]
Issuance of equity to third party investors	$ 248.6
Noncontrolling interest, change from purchase or sale of interests	$ 49.7
Parent company ownership in redeemable noncontrolling interest	22.10%
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.
Subsequent Event [Line Items]
Variable interest entity, ownership percentage				10.10%	28.80%
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Preference Shares
Subsequent Event [Line Items]
Issuance of equity to third party investors				$ 134.1	$ 166.6
Contributions to subsidiaries				$ 9.5	$ 55.2
Upsilon RFO Re Ltd. | Subsequent Event | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.
Subsequent Event [Line Items]
Variable interest entity, ownership percentage	16.00%
Upsilon RFO Re Ltd. | Subsequent Event | Variable Interest Entity, Primary Beneficiary | Preference Shares
Subsequent Event [Line Items]
Issuance of equity to third party investors	$ 46.5
Contributions to subsidiaries	$ 17.7