RenaissanceRe (RNR) 10-Q 30 Oct 19 2019 Q3 Quarterly report Financial data

Coverpage

Coverpage - shares	9 Months Ended
	Sep. 30, 2019	Oct. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-14428
Entity Central Index Key	0000913144
Current Fiscal Year End Date	--12-31
Entity Registrant Name	RENAISSANCERE HOLDINGS LTD
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-0141974
Entity Address, Address Line One	Renaissance House
Entity Address, Address Line Two	12 Crow Lane
Entity Address, City or Town	Pembroke
Entity Address, Country	BM
Entity Address, Postal Zip Code	HM 19
City Area Code	441
Local Phone Number	295-4513
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding (in shares)		44,151,949
Common shares
Entity Information [Line Items]
Title of 12(b) Security	Common Shares, Par Value $1.00 per share
Trading Symbol	RNR
Security Exchange Name	NYSE
Series C 6.08% Preference Shares, Par Value $1.00 per share
Entity Information [Line Items]
Title of 12(b) Security	Series C 6.08% Preference Shares, Par Value $1.00 per share
Trading Symbol	RNR PRC
Security Exchange Name	NYSE
Series E 5.375% Preference Shares, Par Value $1.00 per share
Entity Information [Line Items]
Title of 12(b) Security	Series E 5.375% Preference Shares, Par Value $1.00 per share
Trading Symbol	RNR PRE
Security Exchange Name	NYSE
Depositary Shares, each representing a 1/1,000th interest in a Series F 5.
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share
Trading Symbol	RNR PRF
Security Exchange Name	NYSE

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Fixed maturity investments trading, at fair value – amortized cost $11,214,394 at September 30, 2019 (December 31, 2018 – $8,163,962)	$ 11,386,228	$ 8,088,870
Short term investments, at fair value	4,116,156	2,586,520
Equity investments trading, at fair value	379,422	310,252
Other investments, at fair value	962,109	784,933
Investments in other ventures, under equity method	103,978	115,172
Total investments	16,947,893	11,885,747
Cash and cash equivalents	871,251	1,107,922
Premiums receivable	2,799,954	1,537,188
Prepaid reinsurance premiums	972,047	616,185
Reinsurance recoverable	2,438,299	2,372,221
Accrued investment income	73,509	51,311
Deferred acquisition costs and value of business acquired	708,258	476,661
Receivable for investments sold	225,147	256,416
Other assets	344,593	135,127
Goodwill and other intangible assets	263,259	237,418
Total assets	25,644,210	18,676,196
Liabilities
Reserve for claims and claim expenses	8,602,437	6,076,271
Unearned premiums	2,967,535	1,716,021
Debt	1,383,498	991,127
Reinsurance balances payable	2,910,601	1,902,056
Payable for investments purchased	654,685	380,332
Other liabilities	395,186	513,609
Total liabilities	16,913,942	11,579,416
Commitments and Contingencies
Redeemable noncontrolling interests	2,779,033	2,051,700
Shareholders’ Equity
Preference shares: $1.00 par value – 16,010,000 shares issued and outstanding at September 30, 2019 (December 31, 2018 – 16,010,000)	650,000	650,000
Common shares: $1.00 par value – 44,151,949 shares issued and outstanding at September 30, 2019 (December 31, 2018 – 42,207,390)	44,152	42,207
Additional paid-in capital	560,166	296,099
Accumulated other comprehensive income (loss)	4,988	(1,433)
Retained earnings	4,691,929	4,058,207
Total shareholders’ equity attributable to RenaissanceRe	5,951,235	5,045,080
Total liabilities, noncontrolling interests and shareholders’ equity	$ 25,644,210	$ 18,676,196

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 11,214,394	$ 8,163,962
Preference shares, par value (In dollars per share)	$ 1	$ 1
Preference shares, shares issued (In shares)	16,010,000	16,010,000
Preference shares, shares outstanding (In shares)	16,010,000	16,010,000
Common shares, par value (In dollars per share)	$ 1	$ 1
Common shares, shares issued (In shares)	44,151,949	42,207,390
Common shares, shares outstanding (In shares)	44,151,949	42,207,390

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Gross premiums written	$ 861,068	$ 625,677	$ 3,902,271	$ 2,762,672
Net premiums written	704,130	453,255	2,656,126	1,720,808
Decrease (increase) in unearned premiums	202,618	78,594	(287,848)	(319,292)
Net premiums earned	906,748	531,849	2,368,278	1,401,516
Net investment income	113,844	80,696	311,138	208,528
Net foreign exchange losses	(8,275)	(4,566)	(1,812)	(11,496)
Equity in earnings of other ventures	5,877	7,648	17,350	14,331
Other income	1,016	497	5,109	480
Net realized and unrealized gains (losses) on investments	31,938	13,630	396,586	(86,415)
Total revenues	1,051,148	629,754	3,096,649	1,526,944
Expenses
Net claims and claim expenses incurred	654,520	410,510	1,334,928	642,380
Acquisition expenses	202,181	109,761	553,614	312,524
Operational expenses	53,415	40,593	158,162	119,408
Corporate expenses	13,844	6,841	76,480	21,875
Interest expense	15,580	11,769	42,868	35,304
Total expenses	939,540	579,474	2,166,052	1,131,491
Income before taxes	111,608	50,280	930,597	395,453
Income tax expense	(3,664)	(1,451)	(20,670)	(2,550)
Net income	107,944	48,829	909,927	392,903
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Net income attributable to RenaissanceRe	45,887	42,389	705,836	302,081
Dividends on preference shares	(9,189)	(9,708)	(27,567)	(20,899)
Net income available to RenaissanceRe common shareholders	$ 36,698	$ 32,681	$ 678,269	$ 281,182
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 0.83	$ 0.82	$ 15.58	$ 7.02
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	0.83	0.82	15.57	7.02
Dividends per common share (in dollars per share)	$ 0.34	$ 0.33	$ 1.02	$ 0.99

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income
Net income	$ 107,944	$ 48,829	$ 909,927	$ 392,903
Change in net unrealized gains on investments, net of tax	608	(382)	1,880	(1,707)
Foreign currency translation adjustments, net of tax	8,249	0	4,541	0
Comprehensive income	116,801	48,447	916,348	391,196
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to RenaissanceRe	$ 54,744	$ 42,007	$ 712,257	$ 300,374

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 (loss)	Retained earnings
Beginning balance at Dec. 31, 2017		$ 400,000	$ 40,024	$ 37,355	$ 224	$ 3,913,772
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		250,000	0	0
Offering expenses				(7,883)
Change in redeemable noncontrolling interests				340
Exercise of options and issuance of restricted stock awards			242	12,583
Change in net unrealized gains on investments, net of tax	$ (1,707)				(1,707)
Foreign currency translation adjustments, net of tax	0				0
Net income	392,903					392,903
Net income attributable to redeemable noncontrolling interests	(90,822)					(90,822)
Dividends on common shares	(39,600)					(39,611)
Dividends on preference shares	(20,899)					(20,899)
Ending balance at Sep. 30, 2018	4,886,521	650,000	40,266	42,395	(1,483)	4,155,343
Beginning balance at Jun. 30, 2018		650,000	40,263	35,094	(1,101)	4,135,805
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		0	0	0
Offering expenses				615
Change in redeemable noncontrolling interests				13
Exercise of options and issuance of restricted stock awards			3	6,673
Change in net unrealized gains on investments, net of tax	(382)				(382)
Foreign currency translation adjustments, net of tax	0				0
Net income	48,829					48,829
Net income attributable to redeemable noncontrolling interests	(6,440)					(6,440)
Dividends on common shares						(13,143)
Dividends on preference shares	(9,708)					(9,708)
Ending balance at Sep. 30, 2018	4,886,521	650,000	40,266	42,395	(1,483)	4,155,343
Beginning balance at Dec. 31, 2018	5,045,080	650,000	42,207	296,099	(1,433)	4,058,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		0	1,739	248,259
Offering expenses				0
Change in redeemable noncontrolling interests				(361)
Exercise of options and issuance of restricted stock awards			206	16,169
Change in net unrealized gains on investments, net of tax	1,880				1,880
Foreign currency translation adjustments, net of tax	4,541				4,541
Net income	909,927					909,927
Net income attributable to redeemable noncontrolling interests	(204,091)					(204,091)
Dividends on common shares	(44,500)					(44,547)
Dividends on preference shares	(27,567)
Ending balance at Sep. 30, 2019	5,951,235	650,000	44,152	560,166	4,988	4,691,929
Beginning balance at Jun. 30, 2019		650,000	44,162	552,210	(3,869)	4,670,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares		0	0	0
Offering expenses				0
Change in redeemable noncontrolling interests				(145)
Exercise of options and issuance of restricted stock awards			(10)	8,101
Change in net unrealized gains on investments, net of tax	608				608
Foreign currency translation adjustments, net of tax	8,249				8,249
Net income	107,944					107,944
Net income attributable to redeemable noncontrolling interests	(62,057)					(62,057)
Dividends on common shares						(15,108)
Dividends on preference shares	(9,189)
Ending balance at Sep. 30, 2019	$ 5,951,235	$ 650,000	$ 44,152	$ 560,166	$ 4,988	$ 4,691,929

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided by operating activities
Net income	$ 909,927	$ 392,903
Adjustments to reconcile net income to net cash provided by operating activities
Amortization, accretion and depreciation	(27,239)	30,936
Equity in undistributed earnings of other ventures	1,754	(13,016)
Net realized and unrealized (gains) losses on investments	(396,586)	86,415
Net unrealized gains included in net investment income	(7,284)	(17,778)
Change in:
Premiums receivable	(625,031)	(482,473)
Prepaid reinsurance premiums	(216,064)	(261,950)
Reinsurance recoverable	482,663	382,571
Deferred acquisition costs	74,409	(71,182)
Reserve for claims and claim expenses	118,650	(127,910)
Unearned premiums	487,903	581,242
Reinsurance balances payable	738,442	981,823
Other	(277,112)	(593,055)
Net cash provided by operating activities	1,264,432	888,526
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	12,835,916	8,221,481
Purchases of fixed maturity investments trading	(13,403,711)	(8,692,688)
Net (purchases) sales of equity investments trading	(6,937)	15,490
Net purchases of short term investments	(1,362,151)	(1,465,451)
Net purchases of other investments	(130,476)	(130,649)
Net purchases of investments in other ventures	(2,341)	(20,952)
Return of investment from investment in other ventures	11,250	8,464
Net purchase of other assets	(4,108)	0
Net purchase of the TMR Group Entities	(276,206)	0
Net cash used in investing activities	(2,338,764)	(2,064,305)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(44,547)	(39,611)
Dividends paid – preference shares	(27,567)	(20,899)
Issuance of debt, net of expenses	396,411	0
Issuance of preference shares, net of expenses	0	242,371
Net third party redeemable noncontrolling interest share transactions	515,952	96,021
Taxes paid on withholding shares	(7,229)	(7,079)
Net cash provided by financing activities	833,020	270,803
Effect of exchange rate changes on foreign currency cash	4,641	(3,575)
Net decrease in cash and cash equivalents	(236,671)	(908,551)
Cash and cash equivalents, beginning of period	1,107,922	1,361,592
Cash and cash equivalents, end of period	$ 871,251	$ 453,041

Organization

Organization	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	ORGANIZATION This report on Form 10-Q should be read in conjunction with RenaissanceRe’s Annual Report on Form 10-K (“Form 10-K”) for the fiscal year ended December 31, 2018 . RenaissanceRe was formed under the laws of Bermuda on June 7, 1993. Together with its wholly owned and majority-owned subsidiaries and joint ventures, the Company provides property, casualty and specialty reinsurance and certain insurance solutions to its customers. • On March 22, 2019, the Company’s wholly owned subsidiary, RenaissanceRe Specialty Holdings (UK) Limited, completed its previously announced purchase of all of the share capital of Tokio Millennium Re AG (now known as RenaissanceRe Europe AG) (“RenaissanceRe Europe”), Tokio Millennium Re (UK) Limited (now known as RenaissanceRe (UK) Limited) (“RenaissanceRe UK”), and their respective subsidiaries (collectively, the “TMR Group Entities”) pursuant to a Stock Purchase Agreement by and among the Company, Tokio Marine & Nichido Fire Insurance Co. Ltd. (“Tokio”) and, with respect to certain sections only, Tokio Marine Holdings, Inc. entered into on October 30, 2018 (the “TMR Stock Purchase Agreement”) (the “TMR Stock Purchase”). See “Note 3 . Acquisition of Tokio Millennium Re” for additional information regarding the TMR Stock Purchase. • 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. • 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. RenaissanceRe Syndicate Management Ltd. (“RSML”), a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458. • RenaissanceRe Europe, a Swiss-domiciled reinsurance company, provides property, casualty and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis. • RenaissanceRe UK, a U.K.-domiciled reinsurance company in run-off, provided property, casualty and specialty reinsurance coverages on a worldwide basis. RenaissanceRe UK was placed into run-off effective July 1, 2015, from which date all new and renewal business was written by the U.K. branch of RenaissanceRe Europe. • The Company also manages property, casualty and specialty reinsurance business written on behalf of joint ventures, which 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 consolidated 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 consolidated 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. • Upsilon RFO Re Ltd., formerly known as Upsilon Reinsurance II Ltd. (“Upsilon RFO”), a Bermuda domiciled special purpose insurer (“SPI”), is a managed joint venture formed by the Company primarily 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. • RenaissanceRe Upsilon Fund Ltd. (“Upsilon Fund”), an exempted Bermuda segregated accounts company, was formed by the Company 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. • Fibonacci Reinsurance Ltd. ("Fibonacci Re"), a Bermuda-domiciled SPI, was formed to provide collateralized capacity to Renaissance Reinsurance and its affiliates. Fibonacci Re raises 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. • Effective December 17, 2018, the Company formed Vermeer Reinsurance Ltd. (“Vermeer”), an exempted Bermuda reinsurer, with PGGM, a Dutch pension fund manager. Vermeer provides capacity focused on risk remote layers in the U.S. property catastrophe market. Vermeer is managed by RUM in return for a management fee. The Company maintains a majority voting control of Vermeer, while PGGM retains economic benefits. Vermeer is considered a VIE, as it has voting rights that are not proportional to its participating rights and the Company is the primary beneficiary. As a result, the Company consolidates Vermeer and all significant inter-company transactions have been eliminated. The Company does not currently expect its voting or economic interest in Vermeer to fluctuate. • Effective December 22, 2017, the Company and Reinsurance Group of America, Incorporated closed an initiative (“Langhorne”) to source third party capital to support reinsurers targeting large in-force life and annuity blocks. Langhorne Holdings LLC (“Langhorne Holdings”) is a company that owns and manages certain reinsurance entities within Langhorne. Langhorne Partners LLC (“Langhorne Partners”) is the general partner for Langhorne and the entity which manages the third-parties investing in Langhorne Holdings. The Company concluded that Langhorne Holdings meets the definition of a VIE. The Company is not the primary beneficiary of Langhorne Holdings and as a result, the Company does not consolidate the financial position or results of operations of Langhorne Holdings. The Company concluded that Langhorne Partners is not a VIE. The Company will account for its investments in Langhorne Holdings and Langhorne Partners under the equity method of accounting, one quarter in arrears. • In connection with the acquisition of the TMR Group Entities, the Company manages Shima Reinsurance Ltd. (“Shima Re”), Norwood Re Ltd. (“Norwood Re”) and Blizzard Re Ltd. (“Blizzard Re”) (together, the “TMR third-party capital vehicles”), which provide third-party investors with access to reinsurance risk formerly managed by the TMR Group Entities. Following the closing of the acquisition, some of the TMR third-party capital vehicles’ legacy portfolios of in-force and expired contracts were transferred to other stop loss reinsurance providers.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
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, 2018 , except as described below. BASIS OF PRESENTATION These consolidated financial statements have been prepared on the basis of accounting principles generally accepted in the U.S. (“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. DERIVATIVES From time to time, the Company enters 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 to assume risk. The Company accounts for its derivatives in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic Derivatives and Hedging , which requires all derivatives to be recorded at fair value on the Company’s balance sheet as either assets or liabilities, depending on their rights or obligations, with changes in fair value reflected in current earnings. Commencing in the second quarter of 2019, the Company elected to adopt hedge accounting for certain of its derivative instruments used as hedges of a net investment in a foreign operation, as discussed below. The fair value of the Company’s derivatives is estimated by reference to quoted prices or broker quotes, where available, or in the absence of quoted prices or broker quotes, the use of industry or internal valuation models. Hedges of the Net Investment in a Foreign Operation Changes in the fair value of derivative instruments used to hedge the net investment in a foreign operation, to the extent effective as a hedge, are recorded as a component of accumulated other comprehensive income (loss) in foreign currency translation adjustments, net of tax. Cumulative changes in fair value recorded in accumulated other comprehensive income (loss) are reclassified into earnings upon the sale, or complete or substantially complete liquidation, of the foreign operation. Any hedge ineffectiveness is recorded immediately in current period earnings as net foreign exchange gains (losses). Hedge Documentation and Effectiveness Testing To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating the designated changes in value or cash flow of the hedged item. At the inception of a hedge, the Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking each hedge transaction. The documentation process includes linking derivatives that are designated as net investment hedges to specific assets or liabilities on the consolidated balance sheet. The Company also formally assesses, both at the hedge's inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in the net investment in a foreign operation. The Company will discontinue hedge accounting prospectively if it determines that the derivative is no longer highly effective in offsetting changes in the net investment in a foreign operation, the derivative is no longer designated as a hedging instrument, or the derivative expires or is sold, terminated or exercised. If hedge accounting is discontinued, the derivative continues to be carried at fair value on the consolidated balance sheet with changes in its fair value recognized in current period earnings through net realized and unrealized gains (losses) on investments. FOREIGN EXCHANGE Foreign Currency Revaluation and Translation Monetary assets and liabilities denominated in a currency other than the functional currency of the Company’s subsidiaries in which those monetary assets and liabilities reside are revalued into such subsidiary’s functional currency at the prevailing exchange rate on the balance sheet date. Revenues and expenses denominated in a currency other than the functional currency of the Company’s subsidiaries, are valued at the exchange rate on the date on which the underlying revenue or expense transaction occurred. The net effect of these revaluation adjustments are recognized in the Company’s consolidated statement of operations as part of net foreign exchange (gains) losses. The Company’s functional currency is the U.S. dollar. Certain of the Company’s subsidiaries have a functional currency other than the U.S. dollar. Assets and liabilities of foreign operations whose functional currency is not the U.S. dollar are translated into the Company's U.S. dollar reporting currency at prevailing balance sheet-date exchange rates, while revenue and expenses of such foreign operations are translated into the Company's U.S. dollar functional currency at monthly average exchange rates during the year. The net effect of these translation adjustments, as well as any gains or losses on intercompany balances for which settlement is not planned or anticipated in the foreseeable future, net of applicable deferred income taxes, is included in the Company’s consolidated balance sheet as currency translation adjustments and reflected within accumulated other comprehensive income (loss). RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Leases In February 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-02, Leases and subsequently issued a number of other ASUs to amend the guidance, each ultimately reflected in FASB ASC Topic Leases . FASB ASC Topic Leases requires, among other items, lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under the previous guidance. FASB ASC Topic Leases was effective for public business entities for annual and interim periods beginning after December 15, 2018. The Company has adopted FASB ASC Topic Leases through the application of the modified retrospective transition approach. In addition, the Company employed certain practical expedients permitted under the guidance and utilized its incremental borrowing rate in determining the present value of lease payments, not yet paid. The adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position. The Company determined it was not required to record a cumulative effect adjustment to opening retained earnings as of January 1, 2019. 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 was effective for public business entities for annual and interim periods beginning after December 15, 2018. The adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED 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 collectability 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. 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 two 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 (loss); 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. Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The ASU 2018-13 modifies the disclosure requirements of fair value measurements as part of the disclosure framework project with the objective to improve the effectiveness of disclosures in the notes to the financial statements. ASU 2018-13 allows for removal of the amount and reasons for transfer between Level 1 and Level 2 of the fair value hierarchy; the policy for transfers between levels; and the valuation processes for Level 3 fair value measurements. ASU 2018-13 is effective for all entities for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. 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.

Acquisition of Tokio Millennium

Acquisition of Tokio Millennium Re	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisition of Tokio Millennium Re	ACQUISITION OF TOKIO MILLENNIUM RE Overview The aggregate consideration for the TMR Stock Purchase, which closed on March 22, 2019, was $1.6 billion , consisting of cash, RenaissanceRe common shares and a special dividend from the TMR Group Entities, as described in more detail below. The aggregate consideration paid at closing for the TMR Stock Purchase was based on the closing tangible book value of the TMR Group Entities, subject to a post-closing adjustment under the terms of the TMR Stock Purchase Agreement. The parties determined that no closing adjustment was required. In connection with the closing of the TMR Stock Purchase, Tokio, RenaissanceRe Europe and RenaissanceRe UK entered into a reserve development agreement whereby RenaissanceRe Europe and RenaissanceRe UK agreed to cede to Tokio, and Tokio agreed to indemnify and reimburse RenaissanceRe Europe and RenaissanceRe UK for, substantially all of RenaissanceRe Europe and RenaissanceRe UK’s adverse development on stated reserves at time of the closing, including unearned premium reserves, subject to certain terms and conditions. The reserve development agreement provides the Company with indemnification on stated reserves, including unearned premium reserves, for RenaissanceRe Europe and RenaissanceRe UK, on a whole-account basis, and takes into consideration adverse performance across the Company’s reportable segments. To the extent the combined performance of acquired reserves for claims and claim expenses or unearned premiums is worse than expected on an aggregate basis across reportable segments, the Company is indemnified under the terms of the reserve development agreement and would expect to collect under the reserve development agreement. At closing, RenaissanceRe Europe and Tokio entered into a retrocessional agreement pursuant to which RenaissanceRe Europe ceded to Tokio all of its liabilities arising from certain stop loss reinsurance contracts RenaissanceRe Europe entered into with third party capital partners which were either in force as of the closing date or which incept prior to December 31, 2021. The Company recorded $4.0 million and $44.0 million of corporate expenses associated with the acquisition of the TMR Group Entities during the three and nine months ended September 30, 2019 , respectively. Included in these expenses are compensation, transaction and integration-related costs. Purchase Price The Company's total purchase price for the TMR Group Entities was calculated as follows: Special Dividend Special Dividend paid to common shareholders of Tokio and holders of Tokio equity awards $ 500,000 RenaissanceRe common shares Common shares issued by RenaissanceRe to Tokio 1,739,071 Common share price of RenaissanceRe (1) $ 143.75 Market value of RenaissanceRe common shares issued by RenaissanceRe to Tokio 249,998 Cash consideration Cash consideration paid by RenaissanceRe as acquisition consideration 813,595 Total purchase price 1,563,593 Less: Special Dividend paid to Tokio (500,000 ) Net purchase price $ 1,063,593 (1) RenaissanceRe common share price was based on the 30 -day trailing volume weighted average price of $143.7539 as of market close on March 15, 2019, which approximates fair value. Fair Value of Net Assets Acquired and Liabilities Assumed The purchase price was allocated to the acquired assets and liabilities of the Company based on estimated fair values on March 22, 2019, the date the transaction closed, as detailed below. During the quarter ended March 31, 2019, the Company recognized goodwill of $13.1 million , based on foreign exchange rates on March 22, 2019, attributable to the excess of the purchase price over the fair value of the net assets of the acquired TMR Group Entities. The Company recognized identifiable finite lived intangible assets of $11.2 million , which will be amortized over a weighted average period of 10.5 years , identifiable indefinite lived intangible assets of $6.8 million , and certain other adjustments to the fair values of the assets acquired, liabilities assumed and shareholders’ equity of the TMR Group Entities at March 22, 2019, based on foreign exchange rates on March 22, 2019, as summarized in the table below: Shareholders’ equity of the TMR Group Entities at March 22, 2019 $ 1,032,961 Adjustments for fair value, by applicable balance sheet caption: Net deferred acquisition costs and value of business acquired (56,788 ) Net reserve for claims and claim expenses 67,782 Goodwill and intangible assets at March 22, 2019 of the TMR Group Entities (6,569 ) Total adjustments for fair value by applicable balance sheet caption before tax impact 4,425 Other assets - net deferred tax liability related to fair value adjustments and value of business acquired (2,606 ) Total adjustments for fair value by applicable balance sheet caption, net of tax 1,819 Adjustments for fair value of the identifiable intangible assets: Identifiable indefinite lived intangible assets (insurance licenses) 6,800 Identifiable finite lived intangible assets (top broker relationships and renewal rights) 11,200 Identifiable intangible assets before tax impact 18,000 Other assets - deferred tax liability on identifiable intangible assets (2,281 ) Total adjustments for fair value of the identifiable intangible assets and value of business acquired, net of tax 15,719 Total adjustments for fair value by applicable balance sheet caption, identifiable intangible assets and value of business acquired, net of tax 17,538 Shareholders’ equity of the TMR Group Entities at fair value 1,050,499 Total net purchase price paid by RenaissanceRe 1,063,593 Excess purchase price over the fair value of net assets acquired assigned to goodwill $ 13,094 An explanation of the significant fair value adjustments and related future amortization is as follows: • Net deferred acquisition costs and value of business acquired (“VOBA”) - to reflect the elimination of the TMR Group Entities’ net deferred acquisition costs, partially offset by the establishment of the value of business acquired asset, which represents the present value of the expected underwriting profit within the unearned premiums liability, net of reinsurance, less costs to service the related policies and a risk premium. The adjustment for VOBA will be amortized to acquisition expenses over approximately two years , as the contracts for business in-force as of the acquisition date expire. VOBA at March 22, 2019 was $287.6 million ; • Reserve for claims and claim expenses - to reflect a decrease related to the present value of the net unpaid claims and claim expenses based on the estimated payout pattern, partially offset by an increase in net claims and claim expenses related to the estimated market based risk margin. The risk margin represents the estimated cost of capital required by a market participant to assume the net claims and claim expenses. This will be amortized using the projected discount and risk margin patterns of the net claims and claims expenses as of the acquisition date; • Identifiable indefinite lived and finite lived intangible assets - to establish the fair value of identifiable intangible assets related to the acquisition of the TMR Group Entities described in detail below; and • Other assets - to reflect the net deferred tax liability on identifiable intangible assets. Identifiable intangible assets and accumulated amortization at September 30, 2019 , consisted of the following, based on foreign exchange rates on March 22, 2019, and are included in goodwill and other intangible assets on the Company’s consolidated balance sheet: Amount Economic Useful Life Top broker relationships $ 10,000 10.0 years Renewal rights 1,200 15.0 years Insurance licenses 6,800 Indefinite Gross identifiable intangible assets related to the acquisition of the TMR Group Entities, at March 22, 2019 18,000 Accumulated amortization (from March 22, 2019 through September 30, 2019) 540 Net identifiable intangible assets related to the acquisition of the TMR Group Entities at September 30, 2019 $ 17,460 Amortization from the acquisition date, March 22, 2019, through September 30, 2019 was included in the Company's consolidated statements of operations for the three and nine months ended September 30, 2019 . An explanation of the identifiable intangible assets is as follows: • Top broker relationships - the value of the TMR Group Entities’ relationships with their top four brokers (Marsh & McLennan Companies, Inc., Aon plc, Willis Group Holdings Public Limited Company and Jardine Lloyd Thompson Group plc.) after taking into consideration the expectation of the renewal of these relationships and the associated expenses. These will be amortized on a straight-line basis over the economic useful life as of the acquisition date; • Renewal rights - the value of policy renewal rights after taking into consideration written premiums on assumed retention ratios and the insurance cash flows and the associated equity cash flows from these renewal policies over the expected life of the renewals. These will be amortized on a straight-line basis over the economic useful life as of the acquisition date; and • Insurance licenses - the value of acquired insurance licenses, which provide the ability to write reinsurance in all 50 states of the U.S. and the District of Columbia. As part of the allocation of the purchase price, included in the adjustment to other assets in the table above is a deferred tax liability of $2.3 million related to the estimated fair value of the intangible assets recorded, as well as a net deferred tax liability of $2.6 million related to certain other adjustments to the fair values of the assets acquired, VOBA, liabilities assumed and shareholders’ equity. Other net deferred tax liabilities recorded primarily relate to differences between financial reporting and tax bases of the acquired assets and liabilities as of the acquisition date, March 22, 2019. The Company estimates that none of the goodwill that was recorded will be deductible for income tax purposes. Financial Results The following table summarizes the net contribution from the acquisition of the TMR Group Entities since March 22, 2019 that has been included in the Company's consolidated statements of operations and comprehensive income for the three and nine months ended September 30, 2019 . The operating activities of the TMR Group Entities from the acquisition date, March 22, 2019, through September 30, 2019 are included in the Company’s consolidated statements of operations for the nine months ended September 30, 2019 . The unaudited net contribution of the acquisition and integration of the TMR Group Entities is provided for informational purposes only and is not necessarily, and should not be assumed to be, an indication of the results that may be achieved in the future. These results are not used as a part of management analysis of the financial performance of the Company’s business. These results primarily reflect items recorded directly by the TMR Group Entities, including: 1) net earned premium and net underwriting income on the in-force portfolio acquired with the acquisition of the TMR Group Entities and currently retained on the TMR Group Entities balance sheets; 2) net earned premium and net underwriting income for those contracts which have renewed post-acquisition on one of the acquired TMR Group Entities’ balance sheets; 3) net investment income and net realized and unrealized gains recorded directly by the TMR Group Entities; and 4) certain direct costs incurred directly by the TMR Group Entities. In addition, these results, where possible, are adjusted for transaction and integration related costs incurred by the Company. However, these results do not reflect on-going operating costs incurred by the Company in supporting the TMR Group Entities unless such costs are incurred directly by the TMR Group Entities. These results also do not give consideration to the impact of possible revenue enhancements, expense efficiencies, synergies or asset dispositions that may be achieved in the future. These results involve significant estimates and are not indicative of the future results of the acquired TMR Group Entities, which will be further impacted by potential changes in targeted business mix, investment management strategies, and synergies recognized from changes in the combined entity’s operating structure, as well as the impact of changes in other business and capital management strategies. Since the acquisition date, a growing number of underlying policies have been underwritten onto different legal entities, staffing has been allocated to new activities, and reinsurance has been purchased to cover combined risks, only some of which would have been reflected in the underlying legacy TMR Group Entities results. In future quarters, the summary results of the TMR Group Entities will become increasingly impracticable to produce, and even less indicative of the results of the acquired TMR Group Entities, given the significant estimates involved and the nature and pace of our integration activities, which are intended to integrate the TMR Group Entities as quickly as possible. Three months ended September 30, 2019 Nine months ended September 30, 2019 (1) Total revenues $ 313,250 $ 730,080 Net income available to RenaissanceRe common shareholders (2) $ 31,672 $ 97,068 (1) Includes the net contribution from the acquisition of the TMR Group Entities since March 22, 2019 that has been included in the Company’s consolidated statements of operations and comprehensive income through September 30, 2019. (2) Includes $4.0 million and $44.0 million of corporate expenses associated with the acquisition and integration of the TMR Group Entities for the three and nine months ended September 30, 2019 , respectively. Taxation At the date of acquisition and in conjunction with the acquisition of the TMR Group Entities, the Company established a net deferred tax liability of $5.7 million and recorded a valuation allowance against the TMR Group Entities’ deferred tax assets of $35.7 million in its consolidated financial statements. A predominant amount of the valuation allowance related to the TMR Group Entities’ U.S. operations and was recorded by the TMR Group Entities prior to the acquisition. Supplemental Pro Forma Information The following table presents unaudited pro forma consolidated financial information for the three and nine months ended September 30, 2019 and 2018 , respectively, and assumes the acquisition of the TMR Group Entities occurred on January 1, 2018. The unaudited pro forma consolidated financial information is provided for informational purposes only and is not necessarily, and should not be assumed to be, an indication of the results that would have been achieved had the transaction been completed as of January 1, 2018 or that may be achieved in the future. The unaudited pro forma consolidated financial information does not give consideration to the impact of possible revenue enhancements, expense efficiencies, synergies or asset dispositions that may result from the acquisition of the TMR Group Entities. In addition, unaudited pro forma consolidated financial information does not include the effects of costs associated with any restructuring or integration activities resulting from the acquisition of the TMR Group Entities, as they are nonrecurring. Three months ended Nine months ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Total revenues $ 1,051,148 $ 930,825 $ 3,437,674 $ 2,478,934 Net income available to RenaissanceRe common shareholders $ 36,698 $ 59,174 $ 734,946 $ 309,715 Among other adjustments, and in addition to the fair value adjustments and recognition of goodwill, VOBA and identifiable intangible assets noted above, other material nonrecurring pro forma adjustments directly attributable to the acquisition of the TMR Group Entities principally included certain adjustments to recognize transaction related costs, align accounting policies, and amortize fair value adjustments, VOBA, and identifiable definite lived intangible assets, net of related tax impacts. Defined Benefit Pension Plan The TMR Group Entities have a contributory defined benefit pension plan for certain employees, which was not material to RenaissanceRe’s results of operations, financial condition or cash flows. The plan offers mandatory benefits as prescribed by the applicable law, as well as voluntary benefits. The TMR Group Entities and the members of the plan contribute a defined percentage of salary to the pension arrangement. At retirement, the accumulated contributions are converted into a pension. At March 22, 2019, the net balance sheet liability was $6.1 million , comprising $21.2 million of projected benefit obligation and $15.1 million of plan assets at fair value.

Investments

Investments	9 Months Ended
	Sep. 30, 2019
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 $ 4,314,006 $ 3,331,411 Agencies 507,903 174,883 Municipal 1,629 6,854 Non-U.S. government 379,154 279,818 Non-U.S. government-backed corporate 263,170 160,063 Corporate 3,453,222 2,450,244 Agency mortgage-backed 1,248,722 817,880 Non-agency mortgage-backed 261,850 278,680 Commercial mortgage-backed 406,268 282,294 Asset-backed 550,304 306,743 Total fixed maturity investments trading $ 11,386,228 $ 8,088,870 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, 2019 Amortized Cost Fair Value Due in less than one year $ 605,595 $ 603,806 Due after one through five years 5,820,074 5,893,946 Due after five through ten years 2,170,132 2,232,264 Due after ten years 179,147 189,068 Mortgage-backed 1,888,719 1,916,840 Asset-backed 550,727 550,304 Total $ 11,214,394 $ 11,386,228 Equity Investments Trading The following table summarizes the fair value of equity investments trading: September 30, December 31, Financials $ 207,073 $ 200,357 Communications and technology 70,057 42,333 Industrial, utilities and energy 36,703 24,520 Consumer 34,384 20,639 Healthcare 26,051 18,925 Basic materials 5,154 3,478 Total $ 379,422 $ 310,252 Pledged Investments At September 30, 2019 , $7.1 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, 2018 - $5.7 billion ). Of this amount, $2.9 billion is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities ( December 31, 2018 - $2.0 billion ). Reverse Repurchase Agreements At September 30, 2019 , the Company held $188.2 million ( December 31, 2018 - $3.7 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 $ 82,977 $ 55,725 $ 232,566 $ 151,784 Short term investments 15,061 9,403 44,712 22,340 Equity investments 1,326 903 3,269 3,091 Other investments Private equity investments (4,597 ) 8,723 8,166 12,149 Other 22,538 8,665 30,413 27,346 Cash and cash equivalents 1,978 1,104 5,801 2,708 119,283 84,523 324,927 219,418 Investment expenses (5,439 ) (3,827 ) (13,789 ) (10,890 ) Net investment income $ 113,844 $ 80,696 $ 311,138 $ 208,528 Net Realized and Unrealized Gains (Losses) on Investments Net realized and unrealized gains (losses) on investments are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Gross realized gains $ 34,710 $ 5,229 $ 87,595 $ 14,945 Gross realized losses (4,609 ) (15,327 ) (34,769 ) (67,699 ) Net realized gains (losses) on fixed maturity investments 30,101 (10,098 ) 52,826 (52,754 ) Net unrealized gains (losses) on fixed maturity investments trading 17,226 (8,730 ) 243,139 (73,522 ) Net realized and unrealized gains (losses) on investments-related derivatives 11,134 2,563 62,103 (763 ) Net realized (losses) gains on equity investments trading sold during the period (72 ) 21,259 30,666 21,841 Net unrealized (losses) gains on equity investments trading still held at reporting date (26,451 ) 8,636 7,852 18,783 Net realized and unrealized (losses) gains on equity investments trading (26,523 ) 29,895 38,518 40,624 Net realized and unrealized gains (losses) on investments $ 31,938 $ 13,630 $ 396,586 $ (86,415 )

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
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 Level 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, 2019 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 $ 4,314,006 $ 4,314,006 $ — $ — Agencies 507,903 — 507,903 — Municipal 1,629 — 1,629 — Non-U.S. government 379,154 — 379,154 — Non-U.S. government-backed corporate 263,170 — 263,170 — Corporate 3,453,222 — 3,453,222 — Agency mortgage-backed 1,248,722 — 1,248,722 — Non-agency mortgage-backed 261,850 — 261,850 — Commercial mortgage-backed 406,268 — 406,268 — Asset-backed 550,304 — 550,304 — Total fixed maturity investments 11,386,228 4,314,006 7,072,222 — Short term investments 4,116,156 — 4,116,156 — Equity investments trading 379,422 379,422 — — Other investments Catastrophe bonds 659,466 — 659,466 — Private equity investments (1) 266,048 — — 74,210 Senior secured bank loan funds (1) 24,567 — — — Hedge funds (1) 12,028 — — — Total other investments 962,109 — 659,466 74,210 Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) 6,219 — — 6,219 Derivatives (3) 18,565 212 18,353 — Total other assets and (liabilities) 24,784 212 18,353 6,219 $ 16,868,699 $ 4,693,640 $ 11,866,197 $ 80,429 (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, 2019 was $37.8 million of other assets and $31.6 million of other liabilities. (3) See “Note 14 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2018 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 $ 3,331,411 $ 3,331,411 $ — $ — Agencies 174,883 — 174,883 — Municipal 6,854 — 6,854 — Non-U.S. government 279,818 — 279,818 — Non-U.S. government-backed corporate 160,063 — 160,063 — Corporate 2,450,244 — 2,450,244 — Agency mortgage-backed 817,880 — 817,880 — Non-agency mortgage-backed 278,680 — 278,680 — Commercial mortgage-backed 282,294 — 282,294 — Asset-backed 306,743 — 306,743 — Total fixed maturity investments 8,088,870 3,331,411 4,757,459 — Short term investments 2,586,520 — 2,586,520 — Equity investments trading 310,252 310,252 — — Other investments Catastrophe bonds 516,571 — 516,571 — Private equity investments (1) 242,647 — — 54,545 Senior secured bank loan funds (1) 14,482 — — — Hedge funds (1) 11,233 — — — Total other investments 784,933 — 516,571 54,545 Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (8,359 ) — — (8,359 ) Derivatives (3) 12,399 484 11,915 — Total other assets and (liabilities) 4,040 484 11,915 (8,359 ) $ 11,774,615 $ 3,642,147 $ 7,872,465 $ 46,186 (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, 2018 was $5.0 million of other assets and $13.3 million of other liabilities. (3) See “Note 14 . 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 broker quotations to be 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, 2019 , the Company’s U.S. treasuries fixed maturity investments were primarily priced by pricing services and had a weighted average yield to maturity of 1.7% and a weighted average credit quality of AA ( December 31, 2018 - 2.5% 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, 2019 , the Company’s agency fixed maturity investments had a weighted average yield to maturity of 2.0% and a weighted average credit quality of AA ( December 31, 2018 - 3.0% 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, 2019 , the Company’s municipal fixed maturity investments had a weighted average yield to maturity of 3.0% and a weighted average credit quality of AA ( December 31, 2018 - 4.8% and A, 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 Level 2 - At September 30, 2019 , the Company’s non-U.S. government fixed maturity investments had a weighted average yield to maturity of 1.7% and a weighted average credit quality of AAA ( December 31, 2018 - 2.7% 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, 2019 , the Company’s non-U.S. government-backed corporate fixed maturity investments had a weighted average yield to maturity of 2.0% and a weighted average credit quality of AA ( December 31, 2018 - 2.8% and AA, respectively). Non-U.S. government-backed corporate 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, 2019 , the Company’s corporate fixed maturity investments principally consisted of U.S. and international corporations and had a weighted average yield to maturity of 3.0% and a weighted average credit quality of A ( December 31, 2018 - 4.9% 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, 2019 , the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average yield to maturity of 2.5% , a weighted average credit quality of AA and a weighted average life of 4.7 years ( December 31, 2018 - 3.5% , AA and 7.1 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, non-agency Alt-A and other non-agency residential mortgage-backed securities. At September 30, 2019 , the Company’s non-agency prime residential mortgage-backed fixed maturity investments had a weighted average yield to maturity of 3.3% , a weighted average credit quality of non-investment grade and a weighted average life of 4.7 years ( December 31, 2018 - 4.4% , non-investment grade and 4.7 years, respectively). The Company’s non-agency Alt-A fixed maturity investments held at September 30, 2019 had a weighted average yield to maturity of 3.7% , a weighted average credit quality of non-investment grade and a weighted average life of 6.6 years ( December 31, 2018 - 4.7% , non-investment grade and 6.3 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, 2019 , the Company’s commercial mortgage-backed fixed maturity investments had a weighted average yield to maturity of 2.5% , a weighted average credit quality of AAA, and a weighted average life of 5.6 years ( December 31, 2018 - 3.6% , AAA and 5.0 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, 2019 , the Company’s asset-backed fixed maturity investments had a weighted average yield to maturity of 3.4% , a weighted average credit quality of AAA and a weighted average life of 3.3 years ( December 31, 2018 - 4.3% , AAA and 3.2 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, 2019 , the Company’s short term investments had a weighted average yield to maturity of 1.7% and a weighted average credit quality of AAA ( December 31, 2018 - 2.1% 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. Level 3 Assets and Liabilities Measured at Fair Value Below is a summary of quantitative information regarding the significant 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, 2019 Fair Value (Level 3) Valuation Technique Unobservable Low High Weighted Average or Actual Other investments Private equity investment $ 10,455 External valuation model Indicative pricing $ — $ 105.12 $ 104.55 Private equity investments 63,755 Internal valuation model Liquidity discount n/a n/a 12.5 % Total other investments 74,210 Other assets and (liabilities) Assumed and ceded (re)insurance contracts 484 Internal valuation model Bond price $ 100.32 $ 106.08 $ 103.49 Liquidity discount n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (9,242 ) Internal valuation model Net undiscounted cash flows n/a n/a $ (11,028 ) Expected loss ratio n/a n/a 34.9 % Discount rate n/a n/a 1.6 % Assumed and ceded (re)insurance contracts 14,977 Internal valuation model Expected loss ratio n/a n/a 0.0 % Total other assets and (liabilities) 6,219 Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs $ 80,429 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 investments Other assets and (liabilities) Total Balance - July 1, 2019 $ 74,810 $ 7,942 $ 82,752 Total realized and unrealized losses Included in other income (592 ) (1,188 ) (1,780 ) Total foreign exchange losses (8 ) — (8 ) Purchases — (535 ) (535 ) Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 Other investments Other assets and (liabilities) Total Balance - January 1, 2019 $ 54,545 $ (8,359 ) $ 46,186 Total realized and unrealized gains (losses) Included in other income 1,790 (1,030 ) 760 Total foreign exchange losses (16 ) — (16 ) Purchases 17,891 (4,382 ) 13,509 Settlements — 20 20 Amounts acquired (1) — 19,970 19,970 Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 (1) Represents the fair value of the other assets acquired from the TMR Group Entities, measured at fair value on a recurring basis using Level 3 inputs at March 22, 2019. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Other assets and (liabilities) Balance - July 1, 2018 $ (2,018 ) Total realized and unrealized gains Included in other income 1,754 Purchases (9,668 ) Settlements 983 Balance - September 30, 2018 $ (8,949 ) Other assets and (liabilities) Balance - January 1, 2018 $ (2,952 ) Total realized and unrealized gains Included in other income 2,399 Purchases (9,379 ) Settlements 983 Balance - September 30, 2018 $ (8,949 ) Other investments Private equity investments Level 3 - At September 30, 2019 , the Company’s other investments included a $10.5 million private equity investment which is recorded at fair value, with the fair value obtained through the receipt of an indicative pricing obtained from the insurance manager of the security. The Company considers the price obtained to be unobservable, as there is little, if any, market activity for this security. This unobservable input in isolation can cause significant increases or decreases in fair value. Generally, an increase in the indicative pricing would result in an increase in the fair value of this private equity investment. Level 3 - At September 30, 2019 , the Company’s other investments included $63.8 million of private equity investments which are recorded at fair value, with the fair value obtained through the use of internal valuation models. The Company measured the fair value of these investments using multiples of net tangible book value of the underlying entity. The significant unobservable inputs used in the fair value measurement of these investments are liquidity discount rates applied to each of the net tangible book value multiples used in the internal valuation models. These unobservable inputs in isolation can cause significant increases or decreases in fair value. The discount rates are applied to each of the comparable net tangible book value multiples which are used to determine fair value. The comparable net tangible book value multiples are observable and based on the trading multiples of public industry peers of the underlying entity. Generally, an increase in the liquidity discount rate would result in a decrease in the fair value of this private equity investment. Other assets and liabilities Assumed and ceded (re)insurance contracts Level 3 - At September 30, 2019 , the Company had a $0.5 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, 2019 , the Company had a $9.2 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 an observable input as each is defined in the contract. 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. Level 3 - At September 30, 2019 , the Company had a $15.0 million net asset related to assumed and ceded (re)insurance contracts accounted for at fair value, with the fair value obtained through the use of internal valuation models. The inputs to the models are primarily based on the unexpired period of risk and an evaluation of the probability of loss. The fair value of the contracts are sensitive to loss-triggering events. In the event of a loss, the Company would adjust the fair value of the contract to account for a recovery or liability in accordance with the contract terms and the estimate of exposure under the contract. The inputs for the contracts are based on management’s evaluation and are unobservable. 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, 2019 were debt obligations of $1.4 billion ( December 31, 2018 - $991.1 million ). At September 30, 2019 , the fair value of the Company’s debt obligations was $1.5 billion ( December 31, 2018 – $974.7 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 $ 962,109 $ 784,933 Other assets $ 37,820 $ 4,968 Other liabilities $ 31,601 $ 13,327 Included in net investment income for the three and nine months ended September 30, 2019 were net unrealized gains of $5.1 million and net unrealized gains of $7.3 million , respectively, related to the changes in fair value of other investments ( 2018 – net unrealized gains of $9.1 million and $17.8 million , respectively). Included in other income (loss) for the three and nine months ended September 30, 2019 were net unrealized gains of $Nil and $Nil , respectively, related to the changes in the fair value of other assets and liabilities ( 2018 - net unrealized gains of $Nil and $Nil , respectively). 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, 2019 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity investments $ 191,838 $ 359,470 See below See below See below Senior secured bank loan funds 24,567 7,400 See below See below See below Hedge funds 12,028 — See below See below See below Total other investments measured using net asset valuations $ 228,433 $ 366,870 Private equity investments – A significant portion of the Company’s investments in private equity investments include 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

Reinsurance

Reinsurance	9 Months Ended
	Sep. 30, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [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 reinsurer 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 $ 108,478 $ 74,635 $ 318,984 $ 250,375 Assumed 752,590 551,042 3,583,287 2,512,297 Ceded (156,938 ) (172,422 ) (1,246,145 ) (1,041,864 ) Net premiums written $ 704,130 $ 453,255 $ 2,656,126 $ 1,720,808 Premiums earned Direct $ 103,446 $ 73,356 $ 283,898 $ 213,292 Assumed 1,146,831 760,920 3,114,408 1,968,138 Ceded (343,529 ) (302,427 ) (1,030,028 ) (779,914 ) Net premiums earned $ 906,748 $ 531,849 $ 2,368,278 $ 1,401,516 Claims and claim expenses Gross claims and claim expenses incurred $ 714,714 $ 514,873 $ 1,804,889 $ 817,560 Claims and claim expenses recovered (60,194 ) (104,363 ) (469,961 ) (175,180 ) Net claims and claim expenses incurred $ 654,520 $ 410,510 $ 1,334,928 $ 642,380 At September 30, 2019 , the Company’s reinsurance recoverable balance was $2.4 billion ( December 31, 2018 - $2.4 billion ). Of the Company’s reinsurance recoverable balance at September 30, 2019 , 59.5% is fully collateralized by our reinsurers, 38.9% is recoverable from reinsurers rated A- or higher by major rating agencies and 1.6% is recoverable from reinsurers rated lower than A- by major rating agencies ( December 31, 2018 - 60.8% , 38.0% and 1.2% , respectively). The reinsurers with the three largest balances accounted for 14.6% , 8.2% and 8.0% , respectively, of the Company’s reinsurance recoverable balance at September 30, 2019 ( December 31, 2018 - 15.5% , 6.7% and 6.5% , respectively). The valuation allowance recorded against reinsurance recoverable was $7.1 million at September 30, 2019 ( December 31, 2018 - $9.0 million ). The three largest company-specific components of the valuation allowance represented 17.4% , 7.4% and 7.0% , respectively, of the Company’s total valuation allowance at September 30, 2019 ( December 31, 2018 - 16.2% , 14.8% and 12.3% , respectively).

Reserve for Claims and Claim Ex

Reserve for Claims and Claim Expenses	9 Months Ended
	Sep. 30, 2019
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, 2019 Case Reserves Additional Case Reserves IBNR Total Property $ 1,170,009 $ 1,493,600 $ 916,314 $ 3,579,923 Casualty and Specialty 1,475,505 151,555 3,389,344 5,016,404 Other 2,944 — 3,166 6,110 Total $ 2,648,458 $ 1,645,155 $ 4,308,824 $ 8,602,437 At December 31, 2018 Property $ 690,718 $ 1,308,307 $ 1,087,229 $ 3,086,254 Casualty and Specialty 771,537 116,877 2,096,979 2,985,393 Other 1,458 — 3,166 4,624 Total $ 1,463,713 $ 1,425,184 $ 3,187,374 $ 6,076,271 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Nine months ended September 30, 2019 2018 Net reserves as of beginning of period $ 3,704,050 $ 3,493,778 Net incurred related to: Current year 1,349,448 839,360 Prior years (14,520 ) (196,980 ) Total net incurred 1,334,928 642,380 Net paid related to: Current year 128,471 48,075 Prior years 563,539 326,692 Total net paid 692,010 374,767 Amounts acquired (1) 1,858,775 — Foreign exchange (2) (41,605 ) (12,952 ) Net reserves as of end of period 6,164,138 3,748,439 Reinsurance recoverable as of end of period 2,438,299 1,204,059 Gross reserves as of end of period $ 8,602,437 $ 4,952,498 (1) Represents the fair value of the TMR Group Entities reserves for claims and claim expenses, net of reinsurance recoverables, acquired at March 22, 2019. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. (2) Reflects the impact of the foreign exchange revaluation of net reserves denominated in non-U.S. dollars as at the balance sheet date. 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, 2019 2018 (Favorable) adverse development (Favorable) adverse development Property $ 5,020 $ (172,872 ) Casualty and Specialty (19,718 ) (24,020 ) Other 178 (88 ) Total net favorable development of prior accident years net claims and claim expenses $ (14,520 ) $ (196,980 ) Changes to prior year estimated claims reserves increased net income by $14.5 million during the nine months ended September 30, 2019 ( 2018 - increased net income by $197.0 million ), excluding the consideration of changes in reinstatement, adjustment or other premium items, profit commissions, redeemable noncontrolling interest - DaVinciRe and income tax. Property Segment The following tables detail 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, 2019 (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events 2017 Large Loss Events $ (90,817 ) New Zealand Earthquake (2011) (7,497 ) Tohoku Earthquake and Tsunami (2011) (4,693 ) New Zealand Earthquake (2010) 46,741 2018 Large Loss Events 61,592 Other (10,717 ) Total large catastrophe events (5,391 ) Small catastrophe events and attritional loss movements Other small catastrophe events and attritional loss movements 1,166 Total small catastrophe events and attritional loss movements 1,166 Total catastrophe and attritional net claims and claim expenses (4,225 ) Actuarial assumption changes 9,245 Total net adverse development of prior accident years net claims and claim expenses $ 5,020 The net adverse development of prior accident years net claims and claim expenses within the Company’s Property segment in the nine months ended September 30, 2019 of $5.0 million was comprised of net favorable development of $5.4 million related to large catastrophe events, net adverse development of $1.2 million related to small catastrophe events and attritional loss movements and net adverse development of $9.2 million related to actuarial assumption changes. Included in net favorable development of prior accident years net claims and claim expenses from large catastrophe events was $90.8 million of net decreases in the estimated ultimate losses associated with Hurricanes Harvey, Irma and Maria, the Mexico City Earthquake, the wildfires in California during the fourth quarter of 2017 and certain losses associated with aggregate loss contracts (collectively, the “ 2017 Large Loss Events ”), partially offset by $61.6 million of net increases in the estimated ultimate losses associated with Typhoons Jebi, Mangkhut and Trami, Hurricane Florence, the wildfires in California during the third and fourth quarters of 2018 and Hurricane Michael (collectively, the “2018 Large Loss Events”) and $46.7 million of net increases in the estimated ultimate losses associated with the 2010 New Zealand Earthquake. Nine months ended September 30, 2018 (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events 2017 Large Loss Events $ (151,155 ) Other (7,313 ) Total large catastrophe events (158,468 ) Small catastrophe events and attritional loss movements Other small catastrophe events and attritional loss movements (8,722 ) Total small catastrophe events and attritional loss movements (8,722 ) Total catastrophe and attritional net claims and claim expenses (167,190 ) Actuarial assumption changes (5,682 ) Total net favorable development of prior accident years net claims and claim expenses $ (172,872 ) 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, 2018 of $172.9 million was principally comprised of net favorable development of $151.2 million related to the 2017 Large Loss Events and net favorable development of $8.7 million related to small catastrophe events and attritional loss movements. In addition, the Company’s Property segment experienced net favorable development of $5.7 million related to actuarial assumption changes associated with the other property class of business. 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, 2019 2018 (Favorable) adverse development (Favorable) adverse development Actuarial methods $ (54,527 ) $ (16,234 ) Actuarial assumption changes 34,809 (7,786 ) Total net favorable development of prior accident years net claims and claim expenses $ (19,718 ) $ (24,020 ) The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment of $19.7 million in the nine months ended September 30, 2019 was comprised of net favorable development of $54.5 million related to reported losses generally coming in lower than expected on attritional net claims and claim expenses across a number of lines of business, partially offset by net adverse development of $34.8 million associated with certain actuarial assumption changes. The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment was $24.0 million in the nine months ended September 30, 2018 driven by reported losses generally coming in lower than expected on attritional net claims and claim expenses and certain assumption changes across a number of lines of business.

Debt and Credit Facilities

Debt and Credit Facilities	9 Months Ended
	Sep. 30, 2019
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 obligations and credit facilities as described in its Form 10-K for the year ended December 31, 2018 . Debt Obligations A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below: September 30, 2019 December 31, 2018 Fair Value Carrying Value Fair Value Carrying Value 3.600% Senior Notes due 2029 $ 419,000 $ 391,245 $ — $ — 3.450% Senior Notes due 2027 309,480 296,167 283,680 295,797 3.700% Senior Notes due 2025 315,837 297,964 292,557 297,688 5.750% Senior Notes due 2020 259,600 249,850 255,938 249,602 4.750% Senior Notes due 2025 (DaVinciRe) (1) 156,267 148,272 142,539 148,040 Total debt $ 1,460,184 $ 1,383,498 $ 974,714 $ 991,127 (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. 3.600% Senior Notes Due 2029 On April 2, 2019, the Company issued $400.0 million of its 3.600% Senior Notes due April 15, 2029 , with interest on the notes payable on April 15 and October 15 of each year, commencing on October 15, 2019. The notes are redeemable at the applicable redemption price, subject to the terms described in the indenture for the notes. However, the notes may not be redeemed prior to April 15, 2022 without approval from the Bermuda Monetary Authority (the “BMA”) and may not be redeemed at any time prior to their maturity if enhanced capital requirements, as established by the BMA, would be breached immediately before or after giving effect to the redemption of such notes, unless, in each case, the Company replaces the capital represented by the notes to be redeemed with capital having equal or better capital treatment as the notes under applicable BMA rules. The notes contain various covenants including limitations on mergers and consolidations, and restrictions as to the disposition of, and the placing of liens on, the stock of designated subsidiaries. The net proceeds from this offering were used to repay, in full, the $200.0 million outstanding under the Company’s revolving credit facility at March 31, 2019, which the Company used to partially fund the purchase price for the TMR Stock Purchase, and the remainder of the net proceeds will be used for general corporate purposes. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Credit Facilities The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below: At September 30, 2019 Issued or Drawn RenaissanceRe Revolving Credit Facility (1) $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 31,820 Secured Letter of Credit Facility with Citibank Europe 234,606 Renaissance Reinsurance FAL Facility 255,000 Mizuho Letters of Credit (2) 139,379 Mitsubishi Letters of Credit (2) 77,637 Credit Suisse Letter of Credit Facility 110,051 Uncommitted, Unsecured Letter of Credit Facility with Citibank Europe 218,684 Total credit facilities in U.S. dollars $ 1,067,177 Specialty Risks FAL Facility (1) £ — Total credit facilities in pound sterling £ — (1) At September 30, 2019 , no amounts were issued or drawn under these facilities. (2) These letters of credit were transferred to the Company in connection with the acquisition of the TMR Group Entities. See below under “TMR Group Entities Letters of Credit” for additional information and “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Uncommitted, Unsecured Letter of Credit Facility with Citibank Europe On March 22, 2019, Renaissance Reinsurance, RenaissanceRe Specialty U.S., Renaissance Reinsurance U.S. and RenaissanceRe Europe and Citibank Europe Plc (“CEP”) entered into a Master Agreement for Issuance of Payment Instruments (the “Master Agreement”) and a Facility Letter for Issuance of Payment Instruments (the “Facility Letter” and, together with the Master Agreement, the “Citi Unsecured Facility”). On April 26, 2019, RenaissanceRe UK Limited (together with Renaissance Reinsurance, RenaissanceRe Specialty U.S., Renaissance Reinsurance U.S. and RenaissanceRe Europe, the “Citi Unsecured Applicants”) became a party to the Citi Unsecured Facility. The Citi Unsecured Facility is an uncommitted, unsecured letter of credit facility pursuant to which CEP or one of its correspondents may issue standby letters of credit or similar instruments in multiple currencies for the account of one or more of the Citi Unsecured Applicants. The obligations of the Citi Unsecured Applicants under the Citi Unsecured Facility are guaranteed by the Company. In the Master Agreement, each Citi Unsecured Applicant makes representations and warranties that are customary for facilities of this type and agrees that it will comply with certain informational and other customary undertakings. The Master Agreement contains events of default customary for facilities of this type. In the case of an event of default under the Citi Unsecured Facility, CEP may exercise certain remedies, including requiring that the relevant Citi Unsecured Applicant pledge cash collateral in an amount equal to the maximum actual and contingent liability of the issuing bank under the letters of credit and similar instruments issued for such Citi Unsecured Applicant under the Citi Unsecured Facility , and taking certain actions with respect to the collateral pledged by such Citi Unsecured Applicant (including the sale thereof). In addition, CEP may require that the relevant Citi Unsecured Applicant pledge cash collateral if certain minimum ratings are not satisfied. Credit Suisse Letter of Credit Facility On March 22, 2019, RenaissanceRe Europe, the Company and Credit Suisse (Switzerland) Ltd. (“CS”) entered into an amended and restated letter of credit facility agreement (the “CS A&R LC Agreement”). The CS A&R LC Agreement is a $125 million committed, unsecured letter of credit facility pursuant to which CS (or any other fronting bank acting on behalf of CS) may issue letters of credit or similar instruments in multiple currencies for the account of RenaissanceRe Europe. The obligations of RenaissanceRe Europe under the CS A&R LC Agreement are guaranteed by the Company. In the CS A&R LC Agreement, RenaissanceRe Europe and the Company make representations, warranties and covenants that are customary for facilities of this type, and agree to comply with certain informational and other customary undertakings. The CS A&R LC Agreement also contains certain financial covenants applicable to the Company, including the requirement to maintain the ratio of consolidated debt to capital of not more than 0.35 :1, to maintain a minimum consolidated net worth initially of approximately $3.0 billion , subject to an annual adjustment, and to maintain the Company’s credit rating with S&P and A.M. Best of at least A-. The CS A&R LC Agreement contains events of default customary for facilities of this type. At any time on or after the occurrence of an event of default, CS may exercise remedies, including canceling the commitment, requiring that RenaissanceRe Europe pledge cash collateral in an amount equal to the maximum liability of the issuing bank under the letters of credit and similar instruments issued under the CS A&R LC Agreement, and demanding that RenaissanceRe Europe procure the release by the beneficiaries of the letters of credit and similar instruments issued under the CS A&R LC Agreement. Uncommitted Standby Letter of Credit Facility with Wells Fargo Effective June 21, 2019, the Company, and certain of its affiliates, Renaissance Reinsurance, Renaissance Reinsurance U.S., DaVinci and RenaissanceRe Europe (such affiliates, collectively, the “Wells Fargo Applicants”) entered into an Amended and Restated Standby Letter of Credit Agreement with Wells Fargo Bank, National Association (“Wells Fargo”) which amended and restated the Standby Letter of Credit Agreement, dated as of December 23, 2014 (as amended, the “Wells Fargo A&R LC Agreement”). The Wells Fargo A&R LC Agreement provides for an uncommitted facility under which letters of credit may be issued from time to time for the respective accounts of the Wells Fargo Applicants. As of the effective date of the Wells Fargo A&R LC Agreement, all letters of credit that were issued and outstanding under the prior agreement were deemed issued under and governed by the terms and conditions of the Wells Fargo A&R LC Agreement and RenaissanceRe Europe was added as a new Wells Fargo Applicant. The obligations of the Wells Fargo Applicants other than DaVinci are guaranteed by the Company. The Wells Fargo A&R LC Agreement provides the Wells Fargo Applicants with the ability to request secured letter of credit issuances, and also includes an option for Wells Fargo Applicants to request the issuance of up to $25 million of unsecured letters of credit (outstanding on such request date).The Wells Fargo A&R LC Agreement contains representations, warranties and covenants in respect of the Company and the Wells Fargo Applicants that are customary for facilities of this type. Under the Wells Fargo A&R LC Agreement, each Wells Fargo Applicant is required to pledge eligible collateral having a value sufficient to cover all of its obligations under the Wells Fargo A&R LC Agreement with respect to secured letters of credit issued for its account. In the case of an event of default under the Wells Fargo A&R LC Agreement, Wells Fargo may exercise certain remedies, including conversion of collateral into cash. RenaissanceRe Revolving Credit Facility and Secured Letter of Credit Facility with Citibank Europe In June 2019, the Second Amended and Restated Credit Agreement, dated as of November 9, 2018, between Wells Fargo, the Company, Renaissance Reinsurance, RenaissanceRe Specialty U.S., Renaissance Reinsurance U.S., RenaissanceRe Finance Inc., RenRe North America Holdings Inc., and various financial institutions party thereto and the Facility Letter, dated of September 17, 2010, as amended, between CEP, Renaissance Reinsurance, DaVinci, RenaissanceRe Specialty U.S., Renaissance Reinsurance U.S. and Renaissance Reinsurance of Europe were amended to add RenaissanceRe Europe as a party. Renaissance Reinsurance Funds at Lloyd’s Letter of Credit Facility Effective March 7, 2019, the stated amount of the Funds at Lloyd’s letter of credit issued to Renaissance Reinsurance pursuant to the letter of credit facility with Bank of Montreal, CEP and ING Bank N.V., London Branch as lenders, evidenced by a letter of credit reimbursement agreement dated as of November 23, 2015 (the “Renaissance Reinsurance FAL Facility”), was increased from $180.0 million to $255.0 million . TMR Group Entities Letters of Credit In connection with the acquisition of the TMR Group Entities, certain letters of credit were transferred to the Company, as follows: (a) Mizuho Bank, Ltd. issued certain letters of credit for the account of RenaissanceRe Europe pursuant to a Letter of Credit and Reimbursement Agreement, dated as of May 14, 2012, as previously amended, (b) The Bank of Tokyo-Mitsubishi UFJ Ltd., Düsseldorf Branch, issued certain letters of credit for the account of RenaissanceRe Europe pursuant to a Committed Revolving Standby Letter of Credit Agreement, dated as of September 29, 2017, and (c) The Bank of Tokyo-Mitsubishi UFJ, Ltd. issued certain letters of credit for the account of RenaissanceRe UK pursuant to a Facility Letter, dated as of December 21, 2006. The parties have agreed that no new letters of credit will be issued under these facilities.

Noncontrolling Interests

Noncontrolling Interests	9 Months Ended
	Sep. 30, 2019
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, 2018 Redeemable noncontrolling interest - DaVinciRe $ 1,462,677 $ 1,034,946 Redeemable noncontrolling interest - Medici 534,618 416,765 Redeemable noncontrolling interest - Vermeer 781,738 599,989 Redeemable noncontrolling interests $ 2,779,033 $ 2,051,700 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations is set forth below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Redeemable noncontrolling interest - DaVinciRe $ 30,558 $ 3,730 $ 152,946 $ 74,935 Redeemable noncontrolling interest - Medici 15,211 2,710 19,396 15,887 Redeemable noncontrolling interest - Vermeer 16,288 — 31,749 — Net income attributable to redeemable noncontrolling interests $ 62,057 $ 6,440 $ 204,091 $ 90,822 Redeemable Noncontrolling Interest – DaVinciRe 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 21.9% at September 30, 2019 ( December 31, 2018 - 22.1% ). 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. 2019 Effective June 1, 2019, DaVinciRe completed an equity capital raise of $349.2 million , comprised of $263.1 million from third-party investors and $86.1 million from RenaissanceRe. In addition, RenaissanceRe sold an aggregate of $11.6 million of its shares in DaVinciRe to a third-party investor. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 21.9% , effective June 1, 2019. The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time. 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 $ 1,431,101 $ 1,082,425 $ 1,034,946 $ 1,011,659 Redemption of shares from redeemable noncontrolling interest, net of adjustments 1,018 (170 ) 86 (609 ) Sale of shares to redeemable noncontrolling interests — — 274,699 — Net income attributable to redeemable noncontrolling interest 30,558 3,730 152,946 74,935 Ending balance $ 1,462,677 $ 1,085,985 $ 1,462,677 $ 1,085,985 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. 2019 During the nine months ended September 30, 2019 , third-party investors subscribed for $142.9 million and redeemed $44.4 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 13.7% at September 30, 2019 . 2018 During the nine months ended September 30, 2018 , third-party investors subscribed for $199.5 million and redeemed $52.2 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 15.8% at September 30, 2018 . 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 $ 515,915 $ 411,003 $ 416,765 $ 284,847 Redemption of shares from redeemable noncontrolling interest, net of adjustments (7,008 ) (8,720 ) (44,448 ) (52,223 ) Sale of shares to redeemable noncontrolling interests 10,500 43,000 142,905 199,482 Net income attributable to redeemable noncontrolling interest 15,211 2,710 19,396 15,887 Ending balance $ 534,618 $ 447,993 $ 534,618 $ 447,993 Redeemable Noncontrolling Interest – Vermeer Vermeer is an exempted Bermuda reinsurer that provides capacity focused on risk remote layers in the U.S. property catastrophe market. Vermeer is managed by RUM in return for a management fee. The Company maintains majority voting control of Vermeer, while the sole third-party investor, PGGM, retains all of the economic benefits. The Company concluded that Vermeer is a VIE as it has voting rights that are not proportional to its participating rights, and the Company is the primary beneficiary. As a result, the Company consolidates Vermeer and all significant inter-company transactions have been eliminated. The portion of Vermeer’s earnings owned by PGGM is recorded in the consolidated statements of operations as net income attributable to redeemable noncontrolling interests. The Company has not provided any financial or other support to Vermeer that it was not contractually required to provide. 2019 During the nine months ended September 30, 2019 , PGGM subscribed for $150.0 million of the participating, non-voting common shares of Vermeer. 2018 During the three months ended December 31, 2018, PGGM subscribed for $600.0 million of the participating, non-voting common shares of Vermeer and the Company subscribed for $1 thousand of all the voting, non-participating shares of Vermeer. The activity in redeemable noncontrolling interest – Vermeer is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 765,450 $ — $ 599,989 $ — Sale of shares to redeemable noncontrolling interest — — 150,000 — Net income attributable to redeemable noncontrolling interest 16,288 — 31,749 — Ending balance $ 781,738 $ — $ 781,738 $ —

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	VARIABLE INTEREST ENTITIES Upsilon RFO Upsilon RFO is a managed joint venture and a Bermuda domiciled SPI that was formed by the Company primarily 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. 2019 During the nine months ended September 30, 2019 , Upsilon RFO returned $97.1 million of capital to its investors. In addition, during the nine months ended September 30, 2019 , $604.8 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $100.0 million to the Company. At September 30, 2019 , the Company’s participation in the risks assumed by Upsilon RFO was 16.7% . At September 30, 2019 , the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $2.8 billion and $2.8 billion , respectively ( December 31, 2018 - $2.2 billion and $2.2 billion , respectively). 2018 During 2018, $856.7 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $109.8 million to the Company. At December 31, 2018, the Company’s participation in the risks assumed by Upsilon RFO was 14.0% . Payments for certain of the shares issued during 2018 that were received by the Company prior to January 1, 2018 and were included in other liabilities on the Company’s consolidated balance sheet at December 31, 2017, and in other operating cash flows on the Company’s consolidated statements of cash flows for 2017. During 2018, in connection with the issuance of the non-voting preference shares of Upsilon RFO, other liabilities were reduced by this amount, and reinsurance balances payable were increased by an offsetting amount, with corresponding impacts to other operating cash flows and the change in reinsurance balances payable on the Company consolidated statements of cash flows for 2018. Vermeer Vermeer is an exempted Bermuda reinsurer that provides capacity focused on risk remote layers in the U.S. property catastrophe market. Vermeer is considered a VIE as it has voting rights that are not proportional to its participating rights. The Company is the primary beneficiary of Vermeer as it has power over the activities that most significantly impact the economic performance of Vermeer and has the obligation to absorb expected losses and the right to receive expected benefits that could be significant to Vermeer, in accordance with the accounting guidance. The portion of Vermeer’s earnings owned by PGGM is recorded in the consolidated statements of operations as net income attributable to redeemable noncontrolling interests. See “Note 9 . Noncontrolling Interests” for additional information regarding Vermeer. Other than the Company’s minimal equity investment, it has not provided any financial or other support to Vermeer that it was not contractually required to provide. At September 30, 2019 , the Company’s consolidated balance sheet included total assets and total liabilities of Vermeer of $820.4 million and $38.7 million , respectively ( December 31, 2018 - $600.4 million and $0.4 million , respectively). In addition, the Company’s consolidated balance sheet included redeemable noncontrolling interests associated with Vermeer of $781.7 million at September 30, 2019 ( December 31, 2018 - $600.0 million ). Fibonacci Re 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 is expected to 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 is expected to 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. 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 $1.0 million at September 30, 2019 ( December 31, 2018 - $6.0 million ). Renaissance Reinsurance entered into ceded reinsurance contracts with Fibonacci Re with ceded premiums written of $87 thousand and ceded premiums earned of $87 thousand during the nine months ended September 30, 2019 ( 2018 - $9.1 million and $6.8 million , respectively). During the nine months ended September 30, 2019 , Renaissance Reinsurance ceded $7.5 million of net claims and claim expenses to Fibonacci Re ( 2018 - $Nil ) and as of September 30, 2019 had a net reinsurance recoverable of $7.5 million from Fibonacci Re ( December 31, 2018 - $Nil ). Langhorne The Company and Reinsurance Group of America, Incorporated formed Langhorne, an initiative to source third party capital to support reinsurers targeting large in-force life and annuity blocks. In connection with Langhorne, as of September 30, 2019 the Company has invested $1.7 million in Langhorne Holdings ( December 31, 2018 - $1.3 million ), a company that owns and manages certain reinsurance entities within Langhorne. In addition, as of September 30, 2019 the Company has invested $0.1 million in Langhorne Partners ( December 31, 2018 - $0.1 million ), the general partner for Langhorne and the entity which manages the third-party investors investing into Langhorne Holdings. The Company concluded that Langhorne Holdings meets the definition of a VIE as the voting rights are not proportional with the obligations to absorb losses and rights to receive residual returns. The Company evaluated its relationship with Langhorne Holdings and concluded it is not the primary beneficiary of Langhorne Holdings, as it does not have power over the activities that most significantly impact the economic performance of Langhorne Holdings. As a result, the Company does not consolidate the financial position or results of operations of Langhorne Holdings. The Company separately evaluated Langhorne Partners and concluded that it was not a VIE. The Company accounts for its investments in Langhorne Holdings and Langhorne Partners under the equity method of accounting, one quarter in arrears. The Company anticipates that its absolute investment in Langhorne will increase, perhaps materially, as in-force life and annuity blocks of businesses are written. The Company expects its absolute and relative ownership in Langhorne Partners to remain stable. Other than its current and committed future equity investment in Langhorne, the Company has not provided financial or other support to Langhorne that it was not contractually required to provide. Shima Re and Norwood Re Shima Re and Norwood Re were acquired on March 22, 2019 in connection with the acquisition of the TMR Group Entities. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Shima Re is a Bermuda domiciled Class 3 insurer. Norwood Re is a Bermuda domiciled SPI and is wholly owned by the Norwood Re Purpose Trust. Shima Re and Norwood Re are each registered as a segregated accounts company and each provides third-party investors with access to reinsurance risk formerly managed by the TMR Group Entities. Following the closing of the acquisition, some of the TMR third-party capital vehicles’ legacy portfolios of in-force and expired contracts were transferred to other stop loss reinsurance providers. The maximum remaining exposure of each segregated account is fully collateralized and is funded by cash and term deposits or investments as prescribed by the participant thereto. Shima Re and Norwood Re are considered VIEs as they have voting rights that are not proportional to their participating rights. The Company evaluated its relationships with Shima Re and Norwood Re and concluded it is not the primary beneficiary of any segregated account, as it does not have power over the activities that most significantly impact the economic performance of any segregated account. As a result, the Company does not consolidate the financial position or results of operations of Shima Re, Norwood Re or their segregated accounts. The Company has not provided any financial or other support to any segregated account of Shima Re or Norwood Re that it was not contractually required to provide.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2019
Stockholders' Equity Note [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Dividends The Board of Directors of RenaissanceRe declared dividends of $0.34 per common share, payable to common shareholders of record on March 15, 2019, June 14, 2019 and September 13, 2019, respectively, and the Company paid the dividends on March 29, 2019, June 28, 2019 and September 30, 2019, respectively. The Board of Directors approved the payment of quarterly dividends on the Series C 6.08% Preference Shares, Series E 5.375% Preference Shares and 5.750% Series F 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). The amount of the dividend on the 5.750% Series F Preference Shares is an amount per share equal to 5.750% of the liquidation preference per annum (the equivalent to $1,437.50 per 5.750% Series F Preference Share per annum, or $359.375 per 5.750% Series F Preference Share per quarter, or $1.4375 per Depositary Share per annum, or $0.359375 per Depositary Share per quarter). During the nine months ended September 30, 2019 , the Company paid $27.6 million in preference share dividends ( 2018 - $20.9 million ) and $44.5 million in common share dividends ( 2018 - $39.6 million ). TMR Stock Purchase On March 22, 2019, in connection with the closing of the TMR Stock Purchase, the Company issued 1,739,071 of its common shares to Tokio as part of the aggregate consideration payable to Tokio under the TMR Stock Purchase Agreement. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. 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 November 10, 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, 2019 , the Company did no t repurchase any of its common shares. At September 30, 2019 , $500.0 million remained available for repurchase under the share repurchase program.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
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 income available to RenaissanceRe common shareholders $ 36,698 $ 32,681 $ 678,269 $ 281,182 Amount allocated to participating common shareholders (1) (446 ) (294 ) (8,074 ) (2,977 ) Net income allocated to RenaissanceRe common shareholders $ 36,252 $ 32,387 $ 670,195 $ 278,205 Denominator: Denominator for basic income per RenaissanceRe common share - weighted average common shares 43,462 39,624 43,003 39,606 Per common share equivalents of employee stock options and non-vested shares 75 13 46 21 Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 43,537 39,637 43,049 39,627 Net income available to RenaissanceRe common shareholders per common share – basic $ 0.83 $ 0.82 $ 15.58 $ 7.02 Net income available to RenaissanceRe common shareholders per common share – diluted $ 0.83 $ 0.82 $ 15.57 $ 7.02 (1) Represents earnings attributable to holders of non-vested shares issued pursuant to the Company’s 2001 Stock Incentive Plan, 2016 Long-Term Incentive Plan and to the Company’s non-employee directors.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2019
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 acquisitions and the remnants of its former Bermuda-based insurance operations. The results of operations of the TMR Group Entities from March 22, 2019, through September 30, 2019 , are reflected in the Company’s existing reportable segments for the three and nine months ended September 30, 2019 . 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 whom 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, 2019 Property Casualty and Specialty Other Total Gross premiums written $ 314,400 $ 546,668 $ — $ 861,068 Net premiums written $ 302,982 $ 401,148 $ — $ 704,130 Net premiums earned $ 444,332 $ 462,416 $ — $ 906,748 Net claims and claim expenses incurred 338,260 316,099 161 654,520 Acquisition expenses 79,521 122,654 6 202,181 Operational expenses 34,238 19,198 (21 ) 53,415 Underwriting (loss) income $ (7,687 ) $ 4,465 $ (146 ) (3,368 ) Net investment income 113,844 113,844 Net foreign exchange losses (8,275 ) (8,275 ) Equity in earnings of other ventures 5,877 5,877 Other income 1,016 1,016 Net realized and unrealized gains on investments 31,938 31,938 Corporate expenses (13,844 ) (13,844 ) Interest expense (15,580 ) (15,580 ) Income before taxes and redeemable noncontrolling interests 111,608 Income tax expense (3,664 ) (3,664 ) Net income attributable to redeemable noncontrolling interests (62,057 ) (62,057 ) Dividends on preference shares (9,189 ) (9,189 ) Net income available to RenaissanceRe common shareholders $ 36,698 Net claims and claim expenses incurred – current accident year $ 345,880 $ 319,087 $ — $ 664,967 Net claims and claim expenses incurred – prior accident years (7,620 ) (2,988 ) 161 (10,447 ) Net claims and claim expenses incurred – total $ 338,260 $ 316,099 $ 161 $ 654,520 Net claims and claim expense ratio – current accident year 77.8 % 69.0 % 73.3 % Net claims and claim expense ratio – prior accident years (1.7 )% (0.6 )% (1.1 )% Net claims and claim expense ratio – calendar year 76.1 % 68.4 % 72.2 % Underwriting expense ratio 25.6 % 30.6 % 28.2 % Combined ratio 101.7 % 99.0 % 100.4 % Nine months ended September 30, 2019 Property Casualty and Specialty Other Total Gross premiums written $ 2,185,984 $ 1,716,287 $ — $ 3,902,271 Net premiums written $ 1,411,327 $ 1,244,799 $ — $ 2,656,126 Net premiums earned $ 1,160,090 $ 1,208,188 $ — $ 2,368,278 Net claims and claim expenses incurred 541,217 793,533 178 1,334,928 Acquisition expenses 222,971 330,829 (186 ) 553,614 Operational expenses 99,546 58,603 13 158,162 Underwriting income (loss) $ 296,356 $ 25,223 $ (5 ) 321,574 Net investment income 311,138 311,138 Net foreign exchange losses (1,812 ) (1,812 ) Equity in earnings of other ventures 17,350 17,350 Other income 5,109 5,109 Net realized and unrealized gains on investments 396,586 396,586 Corporate expenses (76,480 ) (76,480 ) Interest expense (42,868 ) (42,868 ) Income before taxes and redeemable noncontrolling interests 930,597 Income tax expense (20,670 ) (20,670 ) Net income attributable to redeemable noncontrolling interests (204,091 ) (204,091 ) Dividends on preference shares (27,567 ) (27,567 ) Net income available to RenaissanceRe common shareholders $ 678,269 Net claims and claim expenses incurred – current accident year $ 536,197 $ 813,251 $ — $ 1,349,448 Net claims and claim expenses incurred – prior accident years 5,020 (19,718 ) 178 (14,520 ) Net claims and claim expenses incurred – total $ 541,217 $ 793,533 $ 178 $ 1,334,928 Net claims and claim expense ratio – current accident year 46.2 % 67.3 % 57.0 % Net claims and claim expense ratio – prior accident years 0.5 % (1.6 )% (0.6 )% Net claims and claim expense ratio – calendar year 46.7 % 65.7 % 56.4 % Underwriting expense ratio 27.8 % 32.2 % 30.0 % Combined ratio 74.5 % 97.9 % 86.4 % Three months ended September 30, 2018 Property Casualty and Specialty Other Total Gross premiums written $ 301,413 $ 324,264 $ — $ 625,677 Net premiums written $ 232,632 $ 220,623 $ — $ 453,255 Net premiums earned $ 293,059 $ 238,791 $ (1 ) $ 531,849 Net claims and claim expenses incurred 265,857 144,671 (18 ) 410,510 Acquisition expenses 45,524 64,238 (1 ) 109,761 Operational expenses 25,577 14,976 40 40,593 Underwriting (loss) income $ (43,899 ) $ 14,906 $ (22 ) (29,015 ) Net investment income 80,696 80,696 Net foreign exchange losses (4,566 ) (4,566 ) Equity in earnings of other ventures 7,648 7,648 Other income 497 497 Net realized and unrealized gains on investments 13,630 13,630 Corporate expenses (6,841 ) (6,841 ) Interest expense (11,769 ) (11,769 ) Income before taxes and redeemable noncontrolling interests 50,280 Income tax expense (1,451 ) (1,451 ) Net income attributable to redeemable noncontrolling interests (6,440 ) (6,440 ) Dividends on preference shares (9,708 ) (9,708 ) Net income available to RenaissanceRe common shareholders $ 32,681 Net claims and claim expenses incurred – current accident year $ 268,022 $ 151,904 $ — $ 419,926 Net claims and claim expenses incurred – prior accident years (2,165 ) (7,233 ) (18 ) (9,416 ) Net claims and claim expenses incurred – total $ 265,857 $ 144,671 $ (18 ) $ 410,510 Net claims and claim expense ratio – current accident year 91.5 % 63.6 % 79.0 % Net claims and claim expense ratio – prior accident years (0.8 )% (3.0 )% (1.8 )% Net claims and claim expense ratio – calendar year 90.7 % 60.6 % 77.2 % Underwriting expense ratio 24.3 % 33.2 % 28.3 % Combined ratio 115.0 % 93.8 % 105.5 % Nine months ended September 30, 2018 Property Casualty and Specialty Other Total Gross premiums written $ 1,561,008 $ 1,201,664 $ — $ 2,762,672 Net premiums written $ 884,541 $ 836,267 $ — $ 1,720,808 Net premiums earned $ 722,246 $ 679,271 $ (1 ) $ 1,401,516 Net claims and claim expenses incurred 222,195 420,273 (88 ) 642,380 Acquisition expenses 127,095 185,429 — 312,524 Operational expenses 75,933 43,121 354 119,408 Underwriting income (loss) $ 297,023 $ 30,448 $ (267 ) 327,204 Net investment income 208,528 208,528 Net foreign exchange losses (11,496 ) (11,496 ) Equity in earnings of other ventures 14,331 14,331 Other income 480 480 Net realized and unrealized losses on investments (86,415 ) (86,415 ) Corporate expenses (21,875 ) (21,875 ) Interest expense (35,304 ) (35,304 ) Income before taxes and redeemable noncontrolling interests 395,453 Income tax expense (2,550 ) (2,550 ) Net income attributable to redeemable noncontrolling interests (90,822 ) (90,822 ) Dividends on preference shares (20,899 ) (20,899 ) Net income available to RenaissanceRe common shareholders $ 281,182 Net claims and claim expenses incurred – current accident year $ 395,067 $ 444,293 $ — $ 839,360 Net claims and claim expenses incurred – prior accident years (172,872 ) (24,020 ) (88 ) (196,980 ) Net claims and claim expenses incurred – total $ 222,195 $ 420,273 $ (88 ) $ 642,380 Net claims and claim expense ratio – current accident year 54.7 % 65.4 % 59.9 % Net claims and claim expense ratio – prior accident years (23.9 )% (3.5 )% (14.1 )% Net claims and claim expense ratio – calendar year 30.8 % 61.9 % 45.8 % Underwriting expense ratio 28.1 % 33.6 % 30.9 % Combined ratio 58.9 % 95.5 % 76.7 %

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2019
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 to assume risk. The Company’s derivative instruments can be exchange traded or over-the-counter, with over-the-counter derivatives 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. Commencing in the second quarter of 2019, the Company elected to adopt hedge accounting for certain of its derivative instruments used as hedges of a net investment in a foreign operation. 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, 2019 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 Derivative instruments not designated as hedges Interest rate futures $ 175 $ 145 $ 30 Other assets $ — $ 30 Interest rate swaps 5 — 5 Other assets — 5 Foreign currency forward contracts (1) 21,822 — 21,822 Other assets — 21,822 Foreign currency forward contracts (2) 1,105 368 737 Other assets — 737 Credit default swaps 209 — 209 Other assets — 209 Total return swaps 1,177 — 1,177 Other assets — 1,177 Equity futures 555 — 555 Other assets — 555 Total derivative instruments not designated as hedges 25,048 513 24,535 — 24,535 Derivative instruments designated as hedges Foreign currency forward contracts (3) 1,072 — 1,072 Other assets — 1,072 Total derivative instruments designated as hedges 1,072 — 1,072 — 1,072 Total $ 26,120 $ 513 $ 25,607 $ — $ 25,607 Derivative Liabilities At September 30, 2019 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 Derivative instruments not designated as hedges Interest rate futures $ 518 $ 145 $ 373 Other liabilities $ 373 $ — Interest rate swaps 16 — 16 Other liabilities 16 — Foreign currency forward contracts (1) 6,676 497 6,179 Other liabilities — 6,179 Foreign currency forward contracts (2) 1,078 368 710 Other liabilities — 710 Total return swaps 180 — 180 Other liabilities — 180 Total derivative instruments not designated as hedges 8,468 1,010 7,458 389 7,069 Derivative instruments designated as hedges Foreign currency forward contracts (3) — 416 (416 ) Other liabilities — (416 ) Total $ 8,468 $ 1,426 $ 7,042 $ 389 $ 6,653 (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. (3) Contracts designated as hedges of a net investment in a foreign operation. Derivative Assets At December 31, 2018 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 Derivative instruments not designated as hedges Interest rate futures $ 971 $ 636 $ 335 Other assets $ — $ 335 Interest rate swaps 860 — 860 Other assets — 860 Foreign currency forward contracts (1) 16,459 2,260 14,199 Other assets — 14,199 Foreign currency forward contracts (2) 3,194 71 3,123 Other assets — 3,123 Equity futures 1,390 977 413 Other assets — 413 Total $ 22,874 $ 3,944 $ 18,930 $ — $ 18,930 Derivative Liabilities At December 31, 2018 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 Derivative instruments not designated as hedges Interest rate futures $ 910 $ 636 $ 273 Other liabilities $ 273 $ — Interest rate swaps 506 — 506 Other liabilities 254 252 Foreign currency forward contracts (1) 4,154 — 4,154 Other liabilities — 4,154 Foreign currency forward contracts (2) 72 71 1 Other liabilities — 1 Credit default swaps 1,606 — 1,606 Other liabilities 1,605 1 Equity futures 977 977 — Other liabilities — — Total $ 8,225 $ 1,684 $ 6,540 $ 2,132 $ 4,408 (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. See “Note 4 . 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, 2019 2018 Derivative instruments not designated as hedges Interest rate futures Net realized and unrealized gains (losses) on investments $ 7,199 $ 2,731 Interest rate swaps Net realized and unrealized gains (losses) on investments 887 (6 ) Foreign currency forward contracts (1) Net foreign exchange losses (5,912 ) (2,596 ) Foreign currency forward contracts (2) Net foreign exchange losses 911 650 Credit default swaps Net realized and unrealized gains (losses) on investments 65 (191 ) Total return swaps Net realized and unrealized gains (losses) on investments 1,960 — Equity futures Net realized and unrealized gains (losses) on investments 1,023 29 Total derivative instruments not designated as hedges 6,133 617 Derivative instruments designated as hedges Foreign currency forward contracts (3) Accumulated other comprehensive income (loss) 3,264 — Total $ 9,397 $ 617 Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Nine months ended September 30, 2019 2018 Derivative instruments not designated as hedges Interest rate futures Net realized and unrealized gains (losses) on investments $ 35,136 $ 292 Interest rate swaps Net realized and unrealized gains (losses) on investments 2,071 129 Foreign currency forward contracts (1) Net foreign exchange losses (13,086 ) (2,227 ) Foreign currency forward contracts (2) Net foreign exchange losses (1,370 ) 1,302 Credit default swaps Net realized and unrealized gains (losses) on investments 5,521 (1,228 ) Total return swaps Net realized and unrealized gains (losses) on investments 6,995 — Equity futures Net realized and unrealized gains (losses) on investments 12,380 44 Total derivative instruments not designated as hedges 47,647 (1,688 ) Derivative instruments designated as hedges Foreign currency forward contracts (3) Accumulated other comprehensive income (loss) 4,108 — Total $ 51,755 $ (1,688 ) (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. (3) Contracts designated as hedges of a net investment in a foreign operation. 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, 2019 . Derivative Instruments Not Designated as Hedges 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, 2019 , the Company had $2.2 billion of notional long positions and $456.9 million of notional short positions of primarily Eurodollar and U.S. treasury futures contracts ( December 31, 2018 - $1.9 billion and $545.8 million , respectively). 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, 2019 , the Company had $25.9 million of notional positions paying a fixed rate and $23.5 million receiving a fixed rate denominated in U.S. dollar swap contracts ( December 31, 2018 - $78.4 million and $32.1 million , respectively). 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 and Non-Investments 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, 2019 , the Company had outstanding underwriting related foreign currency contracts of $536.1 million in notional long positions and $1.0 billion in notional short positions, denominated in U.S. dollars ( December 31, 2018 - $354.1 million and $601.2 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, 2019 , the Company had outstanding investment portfolio related foreign currency contracts of $145.5 million in notional long positions and $42.9 million in notional short positions, denominated in U.S. dollars ( December 31, 2018 - $121.3 million and $42.9 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 may purchase 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. Credit Default Swaps The fair value of the Company’s credit default swaps is determined using industry valuation models, broker bid indications or internal pricing valuation techniques. The fair value of these credit default swaps 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, 2019 , the Company had outstanding credit default swaps of $0.5 million in notional positions to hedge credit risk and $146.4 million in notional positions to assume credit risk, denominated in U.S. dollars ( December 31, 2018 - $1.0 million and $126.2 million , respectively). Total Return Swaps During the nine months ended September 30, 2019 , the Company entered into certain total return swap contracts. The Company uses total return swaps as a means to manage spread duration and credit exposure in its investment portfolio. The fair value of the Company’s total return swaps is determined using broker-dealer bid quotations, market-based prices from pricing vendors or valuation models. At September 30, 2019 , the Company had $230.2 million of notional long positions (long credit) and $Nil of notional short positions (short credit), denominated in U.S. dollars. Equity Derivatives Equity Futures The Company uses equity derivatives in its investment portfolio from time to time to either assume equity risk or hedge its equity exposure. The fair value of the Company’s equity futures is determined using market-based prices from pricing vendors. At September 30, 2019 , the Company had $112.4 million notional long position and $Nil notional short position of equity futures, denominated in U.S. dollars (December 31, 2018 - $44.7 million and $Nil , respectively). Derivative Instruments Designated as Hedges of a Net Investment in a Foreign Operation Foreign Currency Derivatives Hedges of a Net Investment in a Foreign Operation In connection with the acquisition of the TMR Group Entities, the Company acquired certain entities with non-U.S. dollar functional currencies, including RenaissanceRe Europe, Australia Branch, which has an Australian dollar functional currency. The Company has entered into foreign exchange forwards to hedge the Australian dollar net investment in foreign operations, on an after-tax basis, from changes in the exchange rate between the U.S. dollar and the Australian dollar. The Company utilizes foreign exchange forward contracts to hedge the fair value of its net investment in a foreign operation. During the three and nine months ended September 30, 2019 , the Company entered into foreign exchange forward contracts that were formally designated as hedges of its investment in RenaissanceRe Europe, Australia Branch. There was no ineffectiveness in these transactions. The table below provides a summary of derivative instruments designated as hedges of a net investment in a foreign operation, including the weighted average U.S. dollar equivalent of foreign denominated net assets that were hedged and the resulting derivative gain that was recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive loss on the Company’s consolidated statements of changes in shareholders’ equity: Three months ended Nine months ended September 30, September 30, September 30, September 30, Weighted average of U.S. dollar equivalent of foreign denominated net assets $ 79,538 $ — $ 80,303 $ — Derivative gains (1) $ 3,264 $ — $ 4,108 $ — (1) Derivative gains from derivative instruments designated as hedges of the net investment in a foreign operation are recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive loss on the Company’s consolidated statements of changes in shareholders’ equity.

Commitments, Contingencies and

Commitments, Contingencies and Other Items	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Other Items	COMMITMENTS, CONTINGENCIES AND OTHER ITEMS There are no material changes from the commitments, contingencies and other items previously disclosed in the Company’s Form 10-K for the year ended December 31, 2018 , other than disclosures associated with the adoption of FASB ASC Topic Leases as outlined below. See “Note 2 . Significant Accounting Policies” for additional information related to the adoption of FASB ASC Topic Leases. Leases The Company’s operating leases primarily relate to office space for its global underwriting platforms, principally in Bermuda, Australia, Ireland, Singapore, Switzerland, the U.K. and the U.S. These leases expire at various dates through 2027 with a weighted average lease term of 2.3 years . Included in other assets and other liabilities at September 30, 2019 is a right-to-use asset of $20.8 million and a lease liability of $20.9 million , respectively, associated with the Company’s operating leases and reflected as a result of the Company’s adoption of FASB ASC Topic Leases ( December 31, 2018 - $Nil and $Nil , respectively). For the three and nine months ended September 30, 2019 , the Company recorded an operating lease expense of $3.4 million and $7.6 million , respectively, included in other income ( 2018 - $Nil and $Nil , respectively). The Company’s financing leases primarily relate to office space in Bermuda with an initial lease term of 20 years, ending in 2028 , and a bargain renewal option for an additional 30 years. Included in other assets and other liabilities at September 30, 2019 is a right-to-use asset of $20.0 million and a lease liability of $25.3 million , respectively, associated with the Company’s finance leases and reflected as a result of the Company’s adoption of FASB ASC Topic Leases ( December 31, 2018 - $20.6 million and $25.6 million , respectively). For the three and nine months ended September 30, 2019 , the Company recorded interest expense of $0.6 million and $1.9 million , respectively, associated with its finance leases ( 2018 - $0.7 million and $2.0 million , respectively) and amortization of its finance leases right-to-use asset of $0.2 million and $0.7 million , respectively, included in other income ( 2018 - $0.2 million and $0.7 million , respectively). Future minimum lease payments under existing operating and finance leases are detailed below, excluding the bargain renewal option on the finance lease related to office space in Bermuda: Future minimum lease payments Operating leases Finance leases 2019 (remaining) $ 2,256 $ 833 2020 6,625 3,336 2021 6,397 3,336 2022 5,681 3,336 2023 2,690 2,830 2024 1,301 2,661 After 2024 923 10,129 Future minimum lease payments under existing leases $ 25,873 $ 26,461 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. 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, 2019
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 are provided in connection with outstanding debt of the Company’s subsidiaries and present condensed consolidating balance sheets at September 30, 2019 and December 31, 2018 , condensed consolidating statements of operations and condensed consolidating statements of comprehensive income for the three and nine months ended September 30, 2019 and 2018 , and condensed consolidating statements of cash flows for the nine months ended September 30, 2019 and 2018 . Each of RenRe North America Holdings Inc. and RenaissanceRe Finance Inc. is a 100% owned subsidiary of RenaissanceRe and has outstanding debt securities. For additional information related to the terms of the Company’s outstanding debt securities, see “Note 8. Debt and Credit Facilities” in the “Notes to the Consolidated Financial Statements” in the Company’s Form 10-K for the year ended December 31, 2018 and “Note 8 . Debt and Credit Facilities” in the “Notes to the Consolidated Financial Statements” included herein. Condensed Consolidating Balance Sheet at September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 138,084 $ 117,077 $ 18,987 $ 16,673,745 $ — $ 16,947,893 Cash and cash equivalents 5,099 3,691 3,324 859,137 — 871,251 Investments in subsidiaries 5,579,191 50,786 1,279,042 — (6,909,019 ) — Due from subsidiaries and affiliates 8,595 101,579 — — (110,174 ) — Premiums receivable — — — 2,799,954 — 2,799,954 Prepaid reinsurance premiums — — — 972,047 — 972,047 Reinsurance recoverable — — — 2,438,299 — 2,438,299 Accrued investment income 39 208 9 73,253 — 73,509 Deferred acquisition costs — — — 708,258 — 708,258 Receivable for investments sold 482 1 — 224,664 — 225,147 Other assets 795,636 13,853 295,885 (1,806,661 ) 1,045,880 344,593 Goodwill and other intangible assets 117,278 — — 145,981 — 263,259 Total assets $ 6,644,404 $ 287,195 $ 1,597,247 $ 23,088,677 $ (5,973,313 ) $ 25,644,210 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ 8,602,437 $ — $ 8,602,437 Unearned premiums — — — 2,967,535 — 2,967,535 Debt 691,245 — 843,981 148,272 (300,000 ) 1,383,498 Amounts due to subsidiaries and affiliates 2,803 92 101,827 — (104,722 ) — Reinsurance balances payable — — — 2,910,601 — 2,910,601 Payable for investments purchased — 10 — 654,675 — 654,685 Other liabilities (879 ) 328 9,381 375,211 11,145 395,186 Total liabilities 693,169 430 955,189 15,658,731 (393,577 ) 16,913,942 Redeemable noncontrolling interests — — — 2,779,033 — 2,779,033 Shareholders’ Equity Total shareholders’ equity 5,951,235 286,765 642,058 4,650,913 (5,579,736 ) 5,951,235 Total liabilities, noncontrolling interests and shareholders’ equity $ 6,644,404 $ 287,195 $ 1,597,247 $ 23,088,677 $ (5,973,313 ) $ 25,644,210 (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, 2018 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 313,360 $ 77,842 $ 28,885 $ 11,465,660 $ — $ 11,885,747 Cash and cash equivalents 3,534 3,350 9,604 1,091,434 — 1,107,922 Investments in subsidiaries 4,414,475 58,458 1,215,663 — (5,688,596 ) — Due from subsidiaries and affiliates 57,039 101,579 — — (158,618 ) — Premiums receivable — — — 1,537,188 — 1,537,188 Prepaid reinsurance premiums — — — 616,185 — 616,185 Reinsurance recoverable — — — 2,372,221 — 2,372,221 Accrued investment income 1,046 310 127 49,828 — 51,311 Deferred acquisition costs — — — 476,661 — 476,661 Receivable for investments sold 203 23,885 — 232,328 — 256,416 Other assets 458,842 22,571 313,636 (1,403,636 ) 743,714 135,127 Goodwill and other intangible assets 120,476 — — 116,942 — 237,418 Total assets $ 5,368,975 $ 287,995 $ 1,567,915 $ 16,554,811 $ (5,103,500 ) $ 18,676,196 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ 6,076,271 $ — $ 6,076,271 Unearned premiums — — — 1,716,021 — 1,716,021 Debt 300,000 — 843,086 148,041 (300,000 ) 991,127 Amounts due to subsidiaries and affiliates 6,453 217 102,243 — (108,913 ) — Reinsurance balances payable — — — 1,902,056 — 1,902,056 Payable for investments purchased — 24 — 380,308 — 380,332 Other liabilities 17,442 5,362 13,918 482,422 (5,535 ) 513,609 Total liabilities 323,895 5,603 959,247 10,705,119 (414,448 ) 11,579,416 Redeemable noncontrolling interests — — — 2,051,700 — 2,051,700 Shareholders’ Equity Total shareholders’ equity 5,045,080 282,392 608,668 3,797,992 (4,689,052 ) 5,045,080 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,368,975 $ 287,995 $ 1,567,915 $ 16,554,811 $ (5,103,500 ) $ 18,676,196 (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 RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 906,748 $ — $ 906,748 Net investment income 10,263 570 1,906 113,705 (12,600 ) 113,844 Net foreign exchange (losses) gains (14,786 ) — — 6,511 — (8,275 ) Equity in earnings of other ventures — — 1,298 4,579 — 5,877 Other income (loss) 1,234 — — (218 ) — 1,016 Net realized and unrealized gains on investments 1,983 1,147 20 28,788 — 31,938 Total revenues (1,306 ) 1,717 3,224 1,060,113 (12,600 ) 1,051,148 Expenses Net claims and claim expenses incurred — — — 654,520 — 654,520 Acquisition expenses — — — 202,181 — 202,181 Operational expenses 2,039 11 9,018 34,814 7,533 53,415 Corporate expenses 6,948 — 7 5,010 1,879 13,844 Interest expense 5,708 — 9,257 615 — 15,580 Total expenses 14,695 11 18,282 897,140 9,412 939,540 (Loss) income before equity in net income of subsidiaries and taxes (16,001 ) 1,706 (15,058 ) 162,973 (22,012 ) 111,608 Equity in net income of subsidiaries 61,021 1,456 14,365 — (76,842 ) — Income (loss) before taxes 45,020 3,162 (693 ) 162,973 (98,854 ) 111,608 Income tax benefit (expense) 867 (319 ) 1,562 (5,774 ) — (3,664 ) Net income 45,887 2,843 869 157,199 (98,854 ) 107,944 Net income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Net income attributable to RenaissanceRe 45,887 2,843 869 95,142 (98,854 ) 45,887 Dividends on preference shares (9,189 ) — — — — (9,189 ) Net income available attributable to RenaissanceRe common shareholders $ 36,698 $ 2,843 $ 869 $ 95,142 $ (98,854 ) $ 36,698 (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 three months ended September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 45,887 $ 2,843 $ 869 $ 157,199 $ (98,854 ) $ 107,944 Change in net unrealized gains on investments — — — 608 — 608 Foreign currency translation adjustments, net of tax — — — 8,249 — 8,249 Comprehensive income 45,887 2,843 869 166,056 (98,854 ) 116,801 Net income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to RenaissanceRe $ 45,887 $ 2,843 $ 869 $ 103,999 $ (98,854 ) $ 54,744 (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 RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 2,368,278 $ — $ 2,368,278 Net investment income 29,216 1,689 5,983 308,001 (33,751 ) 311,138 Net foreign exchange (losses) gains (20,846 ) — — 19,034 — (1,812 ) Equity in earnings of other ventures — — 2,915 14,435 — 17,350 Other income 1,234 — — 3,875 — 5,109 Net realized and unrealized gains on investments 7,501 15,369 231 373,485 — 396,586 Total revenues 17,105 17,058 9,129 3,087,108 (33,751 ) 3,096,649 Expenses Net claims and claim expenses incurred — — — 1,334,928 — 1,334,928 Acquisition expenses — — — 553,614 — 553,614 Operational expenses 4,643 38 29,958 98,613 24,910 158,162 Corporate expenses 49,618 — 16 21,172 5,674 76,480 Interest expense 13,284 — 27,763 1,821 — 42,868 Total expenses 67,545 38 57,737 2,010,148 30,584 2,166,052 (Loss) income before equity in net income of subsidiaries and taxes (50,440 ) 17,020 (48,608 ) 1,076,960 (64,335 ) 930,597 Equity in net income of subsidiaries 754,634 4,001 76,552 — (835,187 ) — Income before taxes 704,194 21,021 27,944 1,076,960 (899,522 ) 930,597 Income tax benefit (expense) 1,642 (3,472 ) 4,956 (23,796 ) — (20,670 ) Net income 705,836 17,549 32,900 1,053,164 (899,522 ) 909,927 Net income attributable to redeemable noncontrolling interests — — — (204,091 ) — (204,091 ) Net income attributable to RenaissanceRe 705,836 17,549 32,900 849,073 (899,522 ) 705,836 Dividends on preference shares (27,567 ) — — — — (27,567 ) Net income available to RenaissanceRe common shareholders $ 678,269 $ 17,549 $ 32,900 $ 849,073 $ (899,522 ) $ 678,269 (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 for the nine months ended September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 705,836 $ 17,549 $ 32,900 $ 1,053,164 $ (899,522 ) $ 909,927 Change in net unrealized gains on investments — — — 1,880 — 1,880 Foreign currency translation adjustments, net of tax — — — 4,541 — 4,541 Comprehensive income 705,836 17,549 32,900 1,059,585 (899,522 ) 916,348 Net income attributable to redeemable noncontrolling interests — — — (204,091 ) — (204,091 ) Comprehensive income attributable to noncontrolling interests — — — (204,091 ) — (204,091 ) Comprehensive income attributable to RenaissanceRe $ 705,836 $ 17,549 $ 32,900 $ 855,494 $ (899,522 ) $ 712,257 (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 RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 531,849 $ — $ 531,849 Net investment income 6,542 539 1,541 80,472 (8,398 ) 80,696 Net foreign exchange gains (losses) 3 — — (4,569 ) — (4,566 ) Equity in earnings of other ventures — — 290 7,358 — 7,648 Other income — — — 497 — 497 Net realized and unrealized (losses) gains on investments (176 ) 4,479 (73 ) 9,400 — 13,630 Total revenues 6,369 5,018 1,758 625,007 (8,398 ) 629,754 Expenses Net claims and claim expenses incurred — — — 410,510 — 410,510 Acquisition expenses — — — 109,761 — 109,761 Operational expenses 3,570 29 7,493 42,682 (13,181 ) 40,593 Corporate expenses 3,778 — — 3,063 — 6,841 Interest expense 1,478 — 9,257 2,512 (1,478 ) 11,769 Total expenses 8,826 29 16,750 568,528 (14,659 ) 579,474 (Loss) income before equity in net income of subsidiaries and taxes (2,457 ) 4,989 (14,992 ) 56,479 6,261 50,280 Equity in net income of subsidiaries 45,130 2,735 11,666 — (59,531 ) — Income before taxes 42,673 7,724 (3,326 ) 56,479 (53,270 ) 50,280 Income tax (expense) benefit (284 ) (1,026 ) 1,840 (1,981 ) — (1,451 ) Net income (loss) 42,389 6,698 (1,486 ) 54,498 (53,270 ) 48,829 Net income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Net income (loss) attributable to RenaissanceRe 42,389 6,698 (1,486 ) 48,058 (53,270 ) 42,389 Dividends on preference shares (9,708 ) — — — — (9,708 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 32,681 $ 6,698 $ (1,486 ) $ 48,058 $ (53,270 ) $ 32,681 (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, 2018 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 42,389 $ 6,698 $ (1,486 ) $ 54,498 $ (53,270 ) $ 48,829 Change in net unrealized gains on investments — — — (382 ) — (382 ) Comprehensive income (loss) 42,389 6,698 (1,486 ) 54,116 (53,270 ) 48,447 Net income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income (loss) attributable to RenaissanceRe $ 42,389 $ 6,698 $ (1,486 ) $ 47,676 $ (53,270 ) $ 42,007 (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, 2018 RenaissanceRe RenRe North Inc. RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 1,401,516 $ — $ 1,401,516 Net investment income 18,504 1,629 3,981 208,034 (23,620 ) 208,528 Net foreign exchange losses (1 ) — — (11,495 ) — (11,496 ) Equity in earnings of other ventures — — 2,045 12,286 — 14,331 Other income — — — 480 — 480 Net realized and unrealized (losses) gains on investments (821 ) 4,906 (399 ) (90,101 ) — (86,415 ) Total revenues 17,682 6,535 5,627 1,520,720 (23,620 ) 1,526,944 Expenses Net claims and claim expenses incurred — — — 642,380 — 642,380 Acquisition expenses — — — 312,524 — 312,524 Operational expenses 7,551 60 26,737 113,721 (28,661 ) 119,408 Corporate expenses 12,498 — 7 9,370 — 21,875 Interest expense 3,694 — 27,763 7,541 (3,694 ) 35,304 Total expenses 23,743 60 54,507 1,085,536 (32,355 ) 1,131,491 (Loss) income before equity in net income of subsidiaries and taxes (6,061 ) 6,475 (48,880 ) 435,184 8,735 395,453 Equity in net income of subsidiaries 310,081 4,285 29,005 — (343,371 ) — Income (loss) before taxes 304,020 10,760 (19,875 ) 435,184 (334,636 ) 395,453 Income tax (expense) benefit (1,939 ) (1,273 ) 5,677 (5,015 ) — (2,550 ) Net income (loss) 302,081 9,487 (14,198 ) 430,169 (334,636 ) 392,903 Net income attributable to redeemable noncontrolling interests — — — (90,822 ) — (90,822 ) Net income (loss) attributable to RenaissanceRe 302,081 9,487 (14,198 ) 339,347 (334,636 ) 302,081 Dividends on preference shares (20,899 ) — — — — (20,899 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 281,182 $ 9,487 $ (14,198 ) $ 339,347 $ (334,636 ) $ 281,182 (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 nine months ended September 30, 2018 RenaissanceRe RenRe North Inc. RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 302,081 $ 9,487 $ (14,198 ) $ 430,169 $ (334,636 ) $ 392,903 Change in net unrealized gains on investments — — — (1,707 ) — (1,707 ) Comprehensive income (loss) 302,081 9,487 (14,198 ) 428,462 (334,636 ) 391,196 Net income attributable to redeemable noncontrolling interests — — — (90,822 ) — (90,822 ) Comprehensive income attributable to noncontrolling interests — — — (90,822 ) — (90,822 ) Comprehensive income (loss) attributable to RenaissanceRe $ 302,081 $ 9,487 $ (14,198 ) $ 337,640 $ (334,636 ) $ 300,374 (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, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (381,508 ) $ 1,316 $ (30,943 ) $ 1,675,567 $ 1,264,432 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 277,030 51,669 43,746 12,463,471 12,835,916 Purchases of fixed maturity investments trading (66,740 ) (50,549 ) (15,910 ) (13,270,512 ) (13,403,711 ) Net purchases of equity investments trading — (2,476 ) — (4,461 ) (6,937 ) Net (purchases) sales of short term investments (34,209 ) 506 (16,257 ) (1,312,191 ) (1,362,151 ) Net purchases of other investments — — — (130,476 ) (130,476 ) Net purchases of investments in other ventures — — — (2,341 ) (2,341 ) Return of investment from investments in other ventures — — — 11,250 11,250 Net purchases of other assets — — — (4,108 ) (4,108 ) Dividends and return of capital from subsidiaries 855,396 — 13,500 (868,896 ) — Contributions to subsidiaries (1,013,916 ) — — 1,013,916 — Due (from) to subsidiary 48,444 (125 ) (416 ) (47,903 ) — Net purchase of the TMR Group Entities — — — (276,206 ) (276,206 ) Net cash provided by (used in) investing activities 66,005 (975 ) 24,663 (2,428,457 ) (2,338,764 ) Cash flows provided by financing activities Dividends paid – RenaissanceRe common shares (44,547 ) — — — (44,547 ) Dividends paid – preference shares (27,567 ) — — — (27,567 ) Issuance of debt, net of expenses 396,411 — — — 396,411 Net third party redeemable noncontrolling interest share transactions — — — 515,952 515,952 Taxes paid on withholding shares (7,229 ) — — — (7,229 ) Net cash provided by financing activities 317,068 — — 515,952 833,020 Effect of exchange rate changes on foreign currency cash — — — 4,641 4,641 Net increase (decrease) in cash and cash equivalents 1,565 341 (6,280 ) (232,297 ) (236,671 ) Cash and cash equivalents, beginning of period 3,534 3,350 9,604 1,091,434 1,107,922 Cash and cash equivalents, end of period $ 5,099 $ 3,691 $ 3,324 $ 859,137 $ 871,251 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2018 RenaissanceRe RenRe North Inc. 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 $ (5,869 ) $ 1,496 $ 16,194 $ 876,705 $ 888,526 Cash flows used in investing activities Proceeds from sales and maturities of fixed maturity investments trading 384,818 91,118 45,459 7,700,086 8,221,481 Purchases of fixed maturity investments trading (281,994 ) (65,988 ) (20,806 ) (8,323,900 ) (8,692,688 ) Net (purchases) sales of equity investments trading — (624 ) — 16,114 15,490 Net sales (purchases) of short term investments 85,598 360 (9,206 ) (1,542,203 ) (1,465,451 ) Net purchases of other investments — — — (130,649 ) (130,649 ) Net purchases of investments in other ventures — — — (20,952 ) (20,952 ) Return of investment from investment in other ventures — — — 8,464 8,464 Dividends and return of capital from subsidiaries 511,098 — — (511,098 ) — Contributions to subsidiaries (686,106 ) (16,847 ) (65,000 ) 767,953 — Due (from) to subsidiaries (193,249 ) (9,598 ) 36,262 166,585 — Net cash used in investing activities (179,835 ) (1,579 ) (13,291 ) (1,869,600 ) (2,064,305 ) Cash flows provided by financing activities Dividends paid – RenaissanceRe common shares (39,611 ) — — — (39,611 ) Dividends paid – preference shares (20,899 ) — — — (20,899 ) Issuance of preference shares, net of expenses 242,371 — — — 242,371 Net third party redeemable noncontrolling interest share transactions — — — 96,021 96,021 Taxes paid on withholding shares (7,079 ) — — — (7,079 ) Net cash provided by financing activities 174,782 — — 96,021 270,803 Effect of exchange rate changes on foreign currency cash — — — (3,575 ) (3,575 ) Net (decrease) increase in cash and cash equivalents (10,922 ) (83 ) 2,903 (900,449 ) (908,551 ) Cash and cash equivalents, beginning of period 14,656 139 1,469 1,345,328 1,361,592 Cash and cash equivalents, end of period $ 3,734 $ 56 $ 4,372 $ 444,879 $ 453,041 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Typhoon Hagibis The Company currently estimates, on a preliminary basis, that losses from Typhoon Hagibis will have an estimated net negative impact on net income (loss) available (attributable) to RenaissanceRe common shareholders of approximately $175 million on its fourth quarter 2019 results of operations. Net negative impact includes the sum of estimates of net claims and claim expenses incurred, earned reinstatement premiums assumed and ceded, lost profit commissions and redeemable noncontrolling interest. The Company’s estimates of net negative impact are based on a review of its potential exposures, preliminary discussions with certain counterparties and catastrophe modeling techniques. The Company’s actual net negative impact, both individually and in the aggregate, may vary from these estimates, perhaps materially. Meaningful uncertainty regarding the estimates and the nature and extent of the losses from this event remains, driven by the magnitude and recent occurrence of the event, the geographic area in which the event occurred, relatively limited claims data received to date, the contingent nature of business interruption and other exposures, potential uncertainties relating to reinsurance recoveries and other factors inherent in loss estimation, among other things. Updated estimates related to this event will be reflected in RenaissanceRe’s fourth quarter 2019 results of operations, when reported, and changes in these estimates will be recorded in the period in which they occur. Other Fourth Quarter 2019 Catastrophe Events Other catastrophe events in the fourth quarter of 2019, including the ongoing wildfires in California and the tornadoes in North Texas in October 2019, may have an impact on the Company’s financial results. The wildfires in California, including the Kincade Fire in Sonoma County and the Getty and Tick Fires in Los Angeles County, have already forced widespread evacuations and caused extensive power outages. The Company’s assessment of the impact from these other catastrophe events remains at a very preliminary stage. It is difficult at this time to provide an accurate estimate of the financial impact of these events as a result of the ongoing nature of the wildfires and the preliminary nature of the information available and provided thus far by industry participants, among other factors.

Significant Accounting Polici_2

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2019
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 U.S. (“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.
Derivatives	DERIVATIVES From time to time, the Company enters 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 to assume risk. The Company accounts for its derivatives in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic Derivatives and Hedging , which requires all derivatives to be recorded at fair value on the Company’s balance sheet as either assets or liabilities, depending on their rights or obligations, with changes in fair value reflected in current earnings. Commencing in the second quarter of 2019, the Company elected to adopt hedge accounting for certain of its derivative instruments used as hedges of a net investment in a foreign operation, as discussed below. The fair value of the Company’s derivatives is estimated by reference to quoted prices or broker quotes, where available, or in the absence of quoted prices or broker quotes, the use of industry or internal valuation models. Hedges of the Net Investment in a Foreign Operation Changes in the fair value of derivative instruments used to hedge the net investment in a foreign operation, to the extent effective as a hedge, are recorded as a component of accumulated other comprehensive income (loss) in foreign currency translation adjustments, net of tax. Cumulative changes in fair value recorded in accumulated other comprehensive income (loss) are reclassified into earnings upon the sale, or complete or substantially complete liquidation, of the foreign operation. Any hedge ineffectiveness is recorded immediately in current period earnings as net foreign exchange gains (losses). Hedge Documentation and Effectiveness Testing To qualify for hedge accounting treatment, a derivative must be highly effective in mitigating the designated changes in value or cash flow of the hedged item. At the inception of a hedge, the Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking each hedge transaction. The documentation process includes linking derivatives that are designated as net investment hedges to specific assets or liabilities on the consolidated balance sheet. The Company also formally assesses, both at the hedge's inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in the net investment in a foreign operation. The Company will discontinue hedge accounting prospectively if it determines that the derivative is no longer highly effective in offsetting changes in the net investment in a foreign operation, the derivative is no longer designated as a hedging instrument, or the derivative expires or is sold, terminated or exercised. If hedge accounting is discontinued, the derivative continues to be carried at fair value on the consolidated balance sheet with changes in its fair value recognized in current period earnings through net realized and unrealized gains (losses) on investments.
Foreign Exchange	FOREIGN EXCHANGE Foreign Currency Revaluation and Translation Monetary assets and liabilities denominated in a currency other than the functional currency of the Company’s subsidiaries in which those monetary assets and liabilities reside are revalued into such subsidiary’s functional currency at the prevailing exchange rate on the balance sheet date. Revenues and expenses denominated in a currency other than the functional currency of the Company’s subsidiaries, are valued at the exchange rate on the date on which the underlying revenue or expense transaction occurred. The net effect of these revaluation adjustments are recognized in the Company’s consolidated statement of operations as part of net foreign exchange (gains) losses. The Company’s functional currency is the U.S. dollar. Certain of the Company’s subsidiaries have a functional currency other than the U.S. dollar. Assets and liabilities of foreign operations whose functional currency is not the U.S. dollar are translated into the Company's U.S. dollar reporting currency at prevailing balance sheet-date exchange rates, while revenue and expenses of such foreign operations are translated into the Company's U.S. dollar functional currency at monthly average exchange rates during the year. The net effect of these translation adjustments, as well as any gains or losses on intercompany balances for which settlement is not planned or anticipated in the foreseeable future, net of applicable deferred income taxes, is included in the Company’s consolidated balance sheet as currency translation adjustments and reflected within accumulated other comprehensive income (loss).
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements Not Yet Adopted	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Leases In February 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-02, Leases and subsequently issued a number of other ASUs to amend the guidance, each ultimately reflected in FASB ASC Topic Leases . FASB ASC Topic Leases requires, among other items, lessees to recognize lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under the previous guidance. FASB ASC Topic Leases was effective for public business entities for annual and interim periods beginning after December 15, 2018. The Company has adopted FASB ASC Topic Leases through the application of the modified retrospective transition approach. In addition, the Company employed certain practical expedients permitted under the guidance and utilized its incremental borrowing rate in determining the present value of lease payments, not yet paid. The adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position. The Company determined it was not required to record a cumulative effect adjustment to opening retained earnings as of January 1, 2019. 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 was effective for public business entities for annual and interim periods beginning after December 15, 2018. The adoption of this guidance did not have a material impact on the Company’s consolidated statements of operations and financial position. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS NOT YET ADOPTED 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 collectability 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. 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 two 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 (loss); 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. Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement (“ASU 2018-13”). The ASU 2018-13 modifies the disclosure requirements of fair value measurements as part of the disclosure framework project with the objective to improve the effectiveness of disclosures in the notes to the financial statements. ASU 2018-13 allows for removal of the amount and reasons for transfer between Level 1 and Level 2 of the fair value hierarchy; the policy for transfers between levels; and the valuation processes for Level 3 fair value measurements. ASU 2018-13 is effective for all entities for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. 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.

Acquisition of Tokio Millenni_2

Acquisition of Tokio Millennium Re (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Schedule of Acquisition Purchase Price and Financial Results	The following table summarizes the net contribution from the acquisition of the TMR Group Entities since March 22, 2019 that has been included in the Company's consolidated statements of operations and comprehensive income for the three and nine months ended September 30, 2019 . The operating activities of the TMR Group Entities from the acquisition date, March 22, 2019, through September 30, 2019 are included in the Company’s consolidated statements of operations for the nine months ended September 30, 2019 . The unaudited net contribution of the acquisition and integration of the TMR Group Entities is provided for informational purposes only and is not necessarily, and should not be assumed to be, an indication of the results that may be achieved in the future. These results are not used as a part of management analysis of the financial performance of the Company’s business. These results primarily reflect items recorded directly by the TMR Group Entities, including: 1) net earned premium and net underwriting income on the in-force portfolio acquired with the acquisition of the TMR Group Entities and currently retained on the TMR Group Entities balance sheets; 2) net earned premium and net underwriting income for those contracts which have renewed post-acquisition on one of the acquired TMR Group Entities’ balance sheets; 3) net investment income and net realized and unrealized gains recorded directly by the TMR Group Entities; and 4) certain direct costs incurred directly by the TMR Group Entities. In addition, these results, where possible, are adjusted for transaction and integration related costs incurred by the Company. However, these results do not reflect on-going operating costs incurred by the Company in supporting the TMR Group Entities unless such costs are incurred directly by the TMR Group Entities. These results also do not give consideration to the impact of possible revenue enhancements, expense efficiencies, synergies or asset dispositions that may be achieved in the future. These results involve significant estimates and are not indicative of the future results of the acquired TMR Group Entities, which will be further impacted by potential changes in targeted business mix, investment management strategies, and synergies recognized from changes in the combined entity’s operating structure, as well as the impact of changes in other business and capital management strategies. Since the acquisition date, a growing number of underlying policies have been underwritten onto different legal entities, staffing has been allocated to new activities, and reinsurance has been purchased to cover combined risks, only some of which would have been reflected in the underlying legacy TMR Group Entities results. In future quarters, the summary results of the TMR Group Entities will become increasingly impracticable to produce, and even less indicative of the results of the acquired TMR Group Entities, given the significant estimates involved and the nature and pace of our integration activities, which are intended to integrate the TMR Group Entities as quickly as possible. Three months ended September 30, 2019 Nine months ended September 30, 2019 (1) Total revenues $ 313,250 $ 730,080 Net income available to RenaissanceRe common shareholders (2) $ 31,672 $ 97,068 (1) Includes the net contribution from the acquisition of the TMR Group Entities since March 22, 2019 that has been included in the Company’s consolidated statements of operations and comprehensive income through September 30, 2019. (2) Includes $4.0 million and $44.0 million of corporate expenses associated with the acquisition and integration of the TMR Group Entities for the three and nine months ended September 30, 2019 , respectively. The Company's total purchase price for the TMR Group Entities was calculated as follows: Special Dividend Special Dividend paid to common shareholders of Tokio and holders of Tokio equity awards $ 500,000 RenaissanceRe common shares Common shares issued by RenaissanceRe to Tokio 1,739,071 Common share price of RenaissanceRe (1) $ 143.75 Market value of RenaissanceRe common shares issued by RenaissanceRe to Tokio 249,998 Cash consideration Cash consideration paid by RenaissanceRe as acquisition consideration 813,595 Total purchase price 1,563,593 Less: Special Dividend paid to Tokio (500,000 ) Net purchase price $ 1,063,593 (1) RenaissanceRe common share price was based on the 30 -day trailing volume weighted average price of $143.7539 as of market close on March 15, 2019, which approximates fair value.
Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed	The Company recognized identifiable finite lived intangible assets of $11.2 million , which will be amortized over a weighted average period of 10.5 years , identifiable indefinite lived intangible assets of $6.8 million , and certain other adjustments to the fair values of the assets acquired, liabilities assumed and shareholders’ equity of the TMR Group Entities at March 22, 2019, based on foreign exchange rates on March 22, 2019, as summarized in the table below: Shareholders’ equity of the TMR Group Entities at March 22, 2019 $ 1,032,961 Adjustments for fair value, by applicable balance sheet caption: Net deferred acquisition costs and value of business acquired (56,788 ) Net reserve for claims and claim expenses 67,782 Goodwill and intangible assets at March 22, 2019 of the TMR Group Entities (6,569 ) Total adjustments for fair value by applicable balance sheet caption before tax impact 4,425 Other assets - net deferred tax liability related to fair value adjustments and value of business acquired (2,606 ) Total adjustments for fair value by applicable balance sheet caption, net of tax 1,819 Adjustments for fair value of the identifiable intangible assets: Identifiable indefinite lived intangible assets (insurance licenses) 6,800 Identifiable finite lived intangible assets (top broker relationships and renewal rights) 11,200 Identifiable intangible assets before tax impact 18,000 Other assets - deferred tax liability on identifiable intangible assets (2,281 ) Total adjustments for fair value of the identifiable intangible assets and value of business acquired, net of tax 15,719 Total adjustments for fair value by applicable balance sheet caption, identifiable intangible assets and value of business acquired, net of tax 17,538 Shareholders’ equity of the TMR Group Entities at fair value 1,050,499 Total net purchase price paid by RenaissanceRe 1,063,593 Excess purchase price over the fair value of net assets acquired assigned to goodwill $ 13,094
Schedule of Identifiable Intangible Assets Acquired	Identifiable intangible assets and accumulated amortization at September 30, 2019 , consisted of the following, based on foreign exchange rates on March 22, 2019, and are included in goodwill and other intangible assets on the Company’s consolidated balance sheet: Amount Economic Useful Life Top broker relationships $ 10,000 10.0 years Renewal rights 1,200 15.0 years Insurance licenses 6,800 Indefinite Gross identifiable intangible assets related to the acquisition of the TMR Group Entities, at March 22, 2019 18,000 Accumulated amortization (from March 22, 2019 through September 30, 2019) 540 Net identifiable intangible assets related to the acquisition of the TMR Group Entities at September 30, 2019 $ 17,460
Schedule of Business Acquisition, Pro Forma Information	The following table presents unaudited pro forma consolidated financial information for the three and nine months ended September 30, 2019 and 2018 , respectively, and assumes the acquisition of the TMR Group Entities occurred on January 1, 2018. The unaudited pro forma consolidated financial information is provided for informational purposes only and is not necessarily, and should not be assumed to be, an indication of the results that would have been achieved had the transaction been completed as of January 1, 2018 or that may be achieved in the future. The unaudited pro forma consolidated financial information does not give consideration to the impact of possible revenue enhancements, expense efficiencies, synergies or asset dispositions that may result from the acquisition of the TMR Group Entities. In addition, unaudited pro forma consolidated financial information does not include the effects of costs associated with any restructuring or integration activities resulting from the acquisition of the TMR Group Entities, as they are nonrecurring. Three months ended Nine months ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Total revenues $ 1,051,148 $ 930,825 $ 3,437,674 $ 2,478,934 Net income available to RenaissanceRe common shareholders $ 36,698 $ 59,174 $ 734,946 $ 309,715

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2019
Investments [Abstract]
Schedule of Fair Value of Fixed Maturity and Equity Investments Trading	The following table summarizes the fair value of equity investments trading: September 30, December 31, Financials $ 207,073 $ 200,357 Communications and technology 70,057 42,333 Industrial, utilities and energy 36,703 24,520 Consumer 34,384 20,639 Healthcare 26,051 18,925 Basic materials 5,154 3,478 Total $ 379,422 $ 310,252 The following table summarizes the fair value of fixed maturity investments trading: September 30, December 31, U.S. treasuries $ 4,314,006 $ 3,331,411 Agencies 507,903 174,883 Municipal 1,629 6,854 Non-U.S. government 379,154 279,818 Non-U.S. government-backed corporate 263,170 160,063 Corporate 3,453,222 2,450,244 Agency mortgage-backed 1,248,722 817,880 Non-agency mortgage-backed 261,850 278,680 Commercial mortgage-backed 406,268 282,294 Asset-backed 550,304 306,743 Total fixed maturity investments trading $ 11,386,228 $ 8,088,870
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, 2019 Amortized Cost Fair Value Due in less than one year $ 605,595 $ 603,806 Due after one through five years 5,820,074 5,893,946 Due after five through ten years 2,170,132 2,232,264 Due after ten years 179,147 189,068 Mortgage-backed 1,888,719 1,916,840 Asset-backed 550,727 550,304 Total $ 11,214,394 $ 11,386,228
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 $ 82,977 $ 55,725 $ 232,566 $ 151,784 Short term investments 15,061 9,403 44,712 22,340 Equity investments 1,326 903 3,269 3,091 Other investments Private equity investments (4,597 ) 8,723 8,166 12,149 Other 22,538 8,665 30,413 27,346 Cash and cash equivalents 1,978 1,104 5,801 2,708 119,283 84,523 324,927 219,418 Investment expenses (5,439 ) (3,827 ) (13,789 ) (10,890 ) Net investment income $ 113,844 $ 80,696 $ 311,138 $ 208,528
Schedule of Net Realized and Unrealized Gains (Losses)	Net realized and unrealized gains (losses) on investments are as follows: Three months ended Nine months ended September 30, September 30, September 30, September 30, Gross realized gains $ 34,710 $ 5,229 $ 87,595 $ 14,945 Gross realized losses (4,609 ) (15,327 ) (34,769 ) (67,699 ) Net realized gains (losses) on fixed maturity investments 30,101 (10,098 ) 52,826 (52,754 ) Net unrealized gains (losses) on fixed maturity investments trading 17,226 (8,730 ) 243,139 (73,522 ) Net realized and unrealized gains (losses) on investments-related derivatives 11,134 2,563 62,103 (763 ) Net realized (losses) gains on equity investments trading sold during the period (72 ) 21,259 30,666 21,841 Net unrealized (losses) gains on equity investments trading still held at reporting date (26,451 ) 8,636 7,852 18,783 Net realized and unrealized (losses) gains on equity investments trading (26,523 ) 29,895 38,518 40,624 Net realized and unrealized gains (losses) on investments $ 31,938 $ 13,630 $ 396,586 $ (86,415 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
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, 2019 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 $ 4,314,006 $ 4,314,006 $ — $ — Agencies 507,903 — 507,903 — Municipal 1,629 — 1,629 — Non-U.S. government 379,154 — 379,154 — Non-U.S. government-backed corporate 263,170 — 263,170 — Corporate 3,453,222 — 3,453,222 — Agency mortgage-backed 1,248,722 — 1,248,722 — Non-agency mortgage-backed 261,850 — 261,850 — Commercial mortgage-backed 406,268 — 406,268 — Asset-backed 550,304 — 550,304 — Total fixed maturity investments 11,386,228 4,314,006 7,072,222 — Short term investments 4,116,156 — 4,116,156 — Equity investments trading 379,422 379,422 — — Other investments Catastrophe bonds 659,466 — 659,466 — Private equity investments (1) 266,048 — — 74,210 Senior secured bank loan funds (1) 24,567 — — — Hedge funds (1) 12,028 — — — Total other investments 962,109 — 659,466 74,210 Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) 6,219 — — 6,219 Derivatives (3) 18,565 212 18,353 — Total other assets and (liabilities) 24,784 212 18,353 6,219 $ 16,868,699 $ 4,693,640 $ 11,866,197 $ 80,429 (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, 2019 was $37.8 million of other assets and $31.6 million of other liabilities. (3) See “Note 14 . Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company. At December 31, 2018 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 $ 3,331,411 $ 3,331,411 $ — $ — Agencies 174,883 — 174,883 — Municipal 6,854 — 6,854 — Non-U.S. government 279,818 — 279,818 — Non-U.S. government-backed corporate 160,063 — 160,063 — Corporate 2,450,244 — 2,450,244 — Agency mortgage-backed 817,880 — 817,880 — Non-agency mortgage-backed 278,680 — 278,680 — Commercial mortgage-backed 282,294 — 282,294 — Asset-backed 306,743 — 306,743 — Total fixed maturity investments 8,088,870 3,331,411 4,757,459 — Short term investments 2,586,520 — 2,586,520 — Equity investments trading 310,252 310,252 — — Other investments Catastrophe bonds 516,571 — 516,571 — Private equity investments (1) 242,647 — — 54,545 Senior secured bank loan funds (1) 14,482 — — — Hedge funds (1) 11,233 — — — Total other investments 784,933 — 516,571 54,545 Other assets and (liabilities) Assumed and ceded (re)insurance contracts (2) (8,359 ) — — (8,359 ) Derivatives (3) 12,399 484 11,915 — Total other assets and (liabilities) 4,040 484 11,915 (8,359 ) $ 11,774,615 $ 3,642,147 $ 7,872,465 $ 46,186 (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, 2018 was $5.0 million of other assets and $13.3 million of other liabilities. (3) See “Note 14 . 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 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, 2019 Fair Value (Level 3) Valuation Technique Unobservable Low High Weighted Average or Actual Other investments Private equity investment $ 10,455 External valuation model Indicative pricing $ — $ 105.12 $ 104.55 Private equity investments 63,755 Internal valuation model Liquidity discount n/a n/a 12.5 % Total other investments 74,210 Other assets and (liabilities) Assumed and ceded (re)insurance contracts 484 Internal valuation model Bond price $ 100.32 $ 106.08 $ 103.49 Liquidity discount n/a n/a 1.3 % Assumed and ceded (re)insurance contracts (9,242 ) Internal valuation model Net undiscounted cash flows n/a n/a $ (11,028 ) Expected loss ratio n/a n/a 34.9 % Discount rate n/a n/a 1.6 % Assumed and ceded (re)insurance contracts 14,977 Internal valuation model Expected loss ratio n/a n/a 0.0 % Total other assets and (liabilities) 6,219 Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs $ 80,429
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 investments Other assets and (liabilities) Total Balance - July 1, 2019 $ 74,810 $ 7,942 $ 82,752 Total realized and unrealized losses Included in other income (592 ) (1,188 ) (1,780 ) Total foreign exchange losses (8 ) — (8 ) Purchases — (535 ) (535 ) Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 Other investments Other assets and (liabilities) Total Balance - January 1, 2019 $ 54,545 $ (8,359 ) $ 46,186 Total realized and unrealized gains (losses) Included in other income 1,790 (1,030 ) 760 Total foreign exchange losses (16 ) — (16 ) Purchases 17,891 (4,382 ) 13,509 Settlements — 20 20 Amounts acquired (1) — 19,970 19,970 Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 (1) Represents the fair value of the other assets acquired from the TMR Group Entities, measured at fair value on a recurring basis using Level 3 inputs at March 22, 2019. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Other assets and (liabilities) Balance - July 1, 2018 $ (2,018 ) Total realized and unrealized gains Included in other income 1,754 Purchases (9,668 ) Settlements 983 Balance - September 30, 2018 $ (8,949 ) Other assets and (liabilities) Balance - January 1, 2018 $ (2,952 ) Total realized and unrealized gains Included in other income 2,399 Purchases (9,379 ) Settlements 983 Balance - September 30, 2018 $ (8,949 )
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 investments Other assets and (liabilities) Total Balance - July 1, 2019 $ 74,810 $ 7,942 $ 82,752 Total realized and unrealized losses Included in other income (592 ) (1,188 ) (1,780 ) Total foreign exchange losses (8 ) — (8 ) Purchases — (535 ) (535 ) Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 Other investments Other assets and (liabilities) Total Balance - January 1, 2019 $ 54,545 $ (8,359 ) $ 46,186 Total realized and unrealized gains (losses) Included in other income 1,790 (1,030 ) 760 Total foreign exchange losses (16 ) — (16 ) Purchases 17,891 (4,382 ) 13,509 Settlements — 20 20 Amounts acquired (1) — 19,970 19,970 Balance - September 30, 2019 $ 74,210 $ 6,219 $ 80,429 (1) Represents the fair value of the other assets acquired from the TMR Group Entities, measured at fair value on a recurring basis using Level 3 inputs at March 22, 2019. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. Other assets and (liabilities) Balance - July 1, 2018 $ (2,018 ) Total realized and unrealized gains Included in other income 1,754 Purchases (9,668 ) Settlements 983 Balance - September 30, 2018 $ (8,949 ) Other assets and (liabilities) Balance - January 1, 2018 $ (2,952 ) Total realized and unrealized gains Included in other income 2,399 Purchases (9,379 ) Settlements 983 Balance - September 30, 2018 $ (8,949 )
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 $ 962,109 $ 784,933 Other assets $ 37,820 $ 4,968 Other liabilities $ 31,601 $ 13,327
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, 2019 Fair Value Unfunded Redemption Frequency Redemption Redemption Private equity investments $ 191,838 $ 359,470 See below See below See below Senior secured bank loan funds 24,567 7,400 See below See below See below Hedge funds 12,028 — See below See below See below Total other investments measured using net asset valuations $ 228,433 $ 366,870

Reinsurance (Tables)

Reinsurance (Tables)	9 Months Ended
	Sep. 30, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]
Schedule of 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 $ 108,478 $ 74,635 $ 318,984 $ 250,375 Assumed 752,590 551,042 3,583,287 2,512,297 Ceded (156,938 ) (172,422 ) (1,246,145 ) (1,041,864 ) Net premiums written $ 704,130 $ 453,255 $ 2,656,126 $ 1,720,808 Premiums earned Direct $ 103,446 $ 73,356 $ 283,898 $ 213,292 Assumed 1,146,831 760,920 3,114,408 1,968,138 Ceded (343,529 ) (302,427 ) (1,030,028 ) (779,914 ) Net premiums earned $ 906,748 $ 531,849 $ 2,368,278 $ 1,401,516 Claims and claim expenses Gross claims and claim expenses incurred $ 714,714 $ 514,873 $ 1,804,889 $ 817,560 Claims and claim expenses recovered (60,194 ) (104,363 ) (469,961 ) (175,180 ) Net claims and claim expenses incurred $ 654,520 $ 410,510 $ 1,334,928 $ 642,380

Reserve for Claims and Claim _2

Reserve for Claims and Claim Expenses (Tables)	9 Months Ended
	Sep. 30, 2019
Insurance Loss Reserves [Abstract]
Schedule of Liability for Unpaid Claims and Claim Expenses	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, 2019 2018 (Favorable) adverse development (Favorable) adverse development Actuarial methods $ (54,527 ) $ (16,234 ) Actuarial assumption changes 34,809 (7,786 ) Total net favorable development of prior accident years net claims and claim expenses $ (19,718 ) $ (24,020 ) 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, 2019 Case Reserves Additional Case Reserves IBNR Total Property $ 1,170,009 $ 1,493,600 $ 916,314 $ 3,579,923 Casualty and Specialty 1,475,505 151,555 3,389,344 5,016,404 Other 2,944 — 3,166 6,110 Total $ 2,648,458 $ 1,645,155 $ 4,308,824 $ 8,602,437 At December 31, 2018 Property $ 690,718 $ 1,308,307 $ 1,087,229 $ 3,086,254 Casualty and Specialty 771,537 116,877 2,096,979 2,985,393 Other 1,458 — 3,166 4,624 Total $ 1,463,713 $ 1,425,184 $ 3,187,374 $ 6,076,271 Activity in the liability for unpaid claims and claim expenses is summarized as follows: Nine months ended September 30, 2019 2018 Net reserves as of beginning of period $ 3,704,050 $ 3,493,778 Net incurred related to: Current year 1,349,448 839,360 Prior years (14,520 ) (196,980 ) Total net incurred 1,334,928 642,380 Net paid related to: Current year 128,471 48,075 Prior years 563,539 326,692 Total net paid 692,010 374,767 Amounts acquired (1) 1,858,775 — Foreign exchange (2) (41,605 ) (12,952 ) Net reserves as of end of period 6,164,138 3,748,439 Reinsurance recoverable as of end of period 2,438,299 1,204,059 Gross reserves as of end of period $ 8,602,437 $ 4,952,498 (1) Represents the fair value of the TMR Group Entities reserves for claims and claim expenses, net of reinsurance recoverables, acquired at March 22, 2019. See “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities. (2) Reflects the impact of the foreign exchange revaluation of net reserves denominated in non-U.S. dollars as at the balance sheet date. Nine months ended September 30, 2018 (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events 2017 Large Loss Events $ (151,155 ) Other (7,313 ) Total large catastrophe events (158,468 ) Small catastrophe events and attritional loss movements Other small catastrophe events and attritional loss movements (8,722 ) Total small catastrophe events and attritional loss movements (8,722 ) Total catastrophe and attritional net claims and claim expenses (167,190 ) Actuarial assumption changes (5,682 ) Total net favorable development of prior accident years net claims and claim expenses $ (172,872 ) The following tables detail 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, 2019 (Favorable) adverse development Catastrophe net claims and claim expenses Large catastrophe events 2017 Large Loss Events $ (90,817 ) New Zealand Earthquake (2011) (7,497 ) Tohoku Earthquake and Tsunami (2011) (4,693 ) New Zealand Earthquake (2010) 46,741 2018 Large Loss Events 61,592 Other (10,717 ) Total large catastrophe events (5,391 ) Small catastrophe events and attritional loss movements Other small catastrophe events and attritional loss movements 1,166 Total small catastrophe events and attritional loss movements 1,166 Total catastrophe and attritional net claims and claim expenses (4,225 ) Actuarial assumption changes 9,245 Total net adverse development of prior accident years net claims and claim expenses $ 5,020 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, 2019 2018 (Favorable) adverse development (Favorable) adverse development Property $ 5,020 $ (172,872 ) Casualty and Specialty (19,718 ) (24,020 ) Other 178 (88 ) Total net favorable development of prior accident years net claims and claim expenses $ (14,520 ) $ (196,980 )

Debt and Credit Facilities (Tab

Debt and Credit Facilities (Tables)	9 Months Ended
	Sep. 30, 2019
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, 2019 December 31, 2018 Fair Value Carrying Value Fair Value Carrying Value 3.600% Senior Notes due 2029 $ 419,000 $ 391,245 $ — $ — 3.450% Senior Notes due 2027 309,480 296,167 283,680 295,797 3.700% Senior Notes due 2025 315,837 297,964 292,557 297,688 5.750% Senior Notes due 2020 259,600 249,850 255,938 249,602 4.750% Senior Notes due 2025 (DaVinciRe) (1) 156,267 148,272 142,539 148,040 Total debt $ 1,460,184 $ 1,383,498 $ 974,714 $ 991,127 (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, 2019 Issued or Drawn RenaissanceRe Revolving Credit Facility (1) $ — Uncommitted Standby Letter of Credit Facility with Wells Fargo 31,820 Secured Letter of Credit Facility with Citibank Europe 234,606 Renaissance Reinsurance FAL Facility 255,000 Mizuho Letters of Credit (2) 139,379 Mitsubishi Letters of Credit (2) 77,637 Credit Suisse Letter of Credit Facility 110,051 Uncommitted, Unsecured Letter of Credit Facility with Citibank Europe 218,684 Total credit facilities in U.S. dollars $ 1,067,177 Specialty Risks FAL Facility (1) £ — Total credit facilities in pound sterling £ — (1) At September 30, 2019 , no amounts were issued or drawn under these facilities. (2) These letters of credit were transferred to the Company in connection with the acquisition of the TMR Group Entities. See below under “TMR Group Entities Letters of Credit” for additional information and “Note 3 . Acquisition of Tokio Millennium Re” for additional information related to the acquisition of the TMR Group Entities.

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	9 Months Ended
	Sep. 30, 2019
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]
Schedule of Redeemable Noncontrolling Interest	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 $ 515,915 $ 411,003 $ 416,765 $ 284,847 Redemption of shares from redeemable noncontrolling interest, net of adjustments (7,008 ) (8,720 ) (44,448 ) (52,223 ) Sale of shares to redeemable noncontrolling interests 10,500 43,000 142,905 199,482 Net income attributable to redeemable noncontrolling interest 15,211 2,710 19,396 15,887 Ending balance $ 534,618 $ 447,993 $ 534,618 $ 447,993 A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below: September 30, December 31, 2018 Redeemable noncontrolling interest - DaVinciRe $ 1,462,677 $ 1,034,946 Redeemable noncontrolling interest - Medici 534,618 416,765 Redeemable noncontrolling interest - Vermeer 781,738 599,989 Redeemable noncontrolling interests $ 2,779,033 $ 2,051,700 A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations is set forth below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Redeemable noncontrolling interest - DaVinciRe $ 30,558 $ 3,730 $ 152,946 $ 74,935 Redeemable noncontrolling interest - Medici 15,211 2,710 19,396 15,887 Redeemable noncontrolling interest - Vermeer 16,288 — 31,749 — Net income attributable to redeemable noncontrolling interests $ 62,057 $ 6,440 $ 204,091 $ 90,822 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 $ 1,431,101 $ 1,082,425 $ 1,034,946 $ 1,011,659 Redemption of shares from redeemable noncontrolling interest, net of adjustments 1,018 (170 ) 86 (609 ) Sale of shares to redeemable noncontrolling interests — — 274,699 — Net income attributable to redeemable noncontrolling interest 30,558 3,730 152,946 74,935 Ending balance $ 1,462,677 $ 1,085,985 $ 1,462,677 $ 1,085,985 The activity in redeemable noncontrolling interest – Vermeer is detailed in the table below: Three months ended Nine months ended September 30, September 30, September 30, September 30, Beginning balance $ 765,450 $ — $ 599,989 $ — Sale of shares to redeemable noncontrolling interest — — 150,000 — Net income attributable to redeemable noncontrolling interest 16,288 — 31,749 — Ending balance $ 781,738 $ — $ 781,738 $ —

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
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 income available to RenaissanceRe common shareholders $ 36,698 $ 32,681 $ 678,269 $ 281,182 Amount allocated to participating common shareholders (1) (446 ) (294 ) (8,074 ) (2,977 ) Net income allocated to RenaissanceRe common shareholders $ 36,252 $ 32,387 $ 670,195 $ 278,205 Denominator: Denominator for basic income per RenaissanceRe common share - weighted average common shares 43,462 39,624 43,003 39,606 Per common share equivalents of employee stock options and non-vested shares 75 13 46 21 Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions 43,537 39,637 43,049 39,627 Net income available to RenaissanceRe common shareholders per common share – basic $ 0.83 $ 0.82 $ 15.58 $ 7.02 Net income available to RenaissanceRe common shareholders per common share – diluted $ 0.83 $ 0.82 $ 15.57 $ 7.02 (1) Represents earnings attributable to holders of non-vested shares issued pursuant to the Company’s 2001 Stock 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, 2019
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, 2019 Property Casualty and Specialty Other Total Gross premiums written $ 314,400 $ 546,668 $ — $ 861,068 Net premiums written $ 302,982 $ 401,148 $ — $ 704,130 Net premiums earned $ 444,332 $ 462,416 $ — $ 906,748 Net claims and claim expenses incurred 338,260 316,099 161 654,520 Acquisition expenses 79,521 122,654 6 202,181 Operational expenses 34,238 19,198 (21 ) 53,415 Underwriting (loss) income $ (7,687 ) $ 4,465 $ (146 ) (3,368 ) Net investment income 113,844 113,844 Net foreign exchange losses (8,275 ) (8,275 ) Equity in earnings of other ventures 5,877 5,877 Other income 1,016 1,016 Net realized and unrealized gains on investments 31,938 31,938 Corporate expenses (13,844 ) (13,844 ) Interest expense (15,580 ) (15,580 ) Income before taxes and redeemable noncontrolling interests 111,608 Income tax expense (3,664 ) (3,664 ) Net income attributable to redeemable noncontrolling interests (62,057 ) (62,057 ) Dividends on preference shares (9,189 ) (9,189 ) Net income available to RenaissanceRe common shareholders $ 36,698 Net claims and claim expenses incurred – current accident year $ 345,880 $ 319,087 $ — $ 664,967 Net claims and claim expenses incurred – prior accident years (7,620 ) (2,988 ) 161 (10,447 ) Net claims and claim expenses incurred – total $ 338,260 $ 316,099 $ 161 $ 654,520 Net claims and claim expense ratio – current accident year 77.8 % 69.0 % 73.3 % Net claims and claim expense ratio – prior accident years (1.7 )% (0.6 )% (1.1 )% Net claims and claim expense ratio – calendar year 76.1 % 68.4 % 72.2 % Underwriting expense ratio 25.6 % 30.6 % 28.2 % Combined ratio 101.7 % 99.0 % 100.4 % Nine months ended September 30, 2019 Property Casualty and Specialty Other Total Gross premiums written $ 2,185,984 $ 1,716,287 $ — $ 3,902,271 Net premiums written $ 1,411,327 $ 1,244,799 $ — $ 2,656,126 Net premiums earned $ 1,160,090 $ 1,208,188 $ — $ 2,368,278 Net claims and claim expenses incurred 541,217 793,533 178 1,334,928 Acquisition expenses 222,971 330,829 (186 ) 553,614 Operational expenses 99,546 58,603 13 158,162 Underwriting income (loss) $ 296,356 $ 25,223 $ (5 ) 321,574 Net investment income 311,138 311,138 Net foreign exchange losses (1,812 ) (1,812 ) Equity in earnings of other ventures 17,350 17,350 Other income 5,109 5,109 Net realized and unrealized gains on investments 396,586 396,586 Corporate expenses (76,480 ) (76,480 ) Interest expense (42,868 ) (42,868 ) Income before taxes and redeemable noncontrolling interests 930,597 Income tax expense (20,670 ) (20,670 ) Net income attributable to redeemable noncontrolling interests (204,091 ) (204,091 ) Dividends on preference shares (27,567 ) (27,567 ) Net income available to RenaissanceRe common shareholders $ 678,269 Net claims and claim expenses incurred – current accident year $ 536,197 $ 813,251 $ — $ 1,349,448 Net claims and claim expenses incurred – prior accident years 5,020 (19,718 ) 178 (14,520 ) Net claims and claim expenses incurred – total $ 541,217 $ 793,533 $ 178 $ 1,334,928 Net claims and claim expense ratio – current accident year 46.2 % 67.3 % 57.0 % Net claims and claim expense ratio – prior accident years 0.5 % (1.6 )% (0.6 )% Net claims and claim expense ratio – calendar year 46.7 % 65.7 % 56.4 % Underwriting expense ratio 27.8 % 32.2 % 30.0 % Combined ratio 74.5 % 97.9 % 86.4 % Three months ended September 30, 2018 Property Casualty and Specialty Other Total Gross premiums written $ 301,413 $ 324,264 $ — $ 625,677 Net premiums written $ 232,632 $ 220,623 $ — $ 453,255 Net premiums earned $ 293,059 $ 238,791 $ (1 ) $ 531,849 Net claims and claim expenses incurred 265,857 144,671 (18 ) 410,510 Acquisition expenses 45,524 64,238 (1 ) 109,761 Operational expenses 25,577 14,976 40 40,593 Underwriting (loss) income $ (43,899 ) $ 14,906 $ (22 ) (29,015 ) Net investment income 80,696 80,696 Net foreign exchange losses (4,566 ) (4,566 ) Equity in earnings of other ventures 7,648 7,648 Other income 497 497 Net realized and unrealized gains on investments 13,630 13,630 Corporate expenses (6,841 ) (6,841 ) Interest expense (11,769 ) (11,769 ) Income before taxes and redeemable noncontrolling interests 50,280 Income tax expense (1,451 ) (1,451 ) Net income attributable to redeemable noncontrolling interests (6,440 ) (6,440 ) Dividends on preference shares (9,708 ) (9,708 ) Net income available to RenaissanceRe common shareholders $ 32,681 Net claims and claim expenses incurred – current accident year $ 268,022 $ 151,904 $ — $ 419,926 Net claims and claim expenses incurred – prior accident years (2,165 ) (7,233 ) (18 ) (9,416 ) Net claims and claim expenses incurred – total $ 265,857 $ 144,671 $ (18 ) $ 410,510 Net claims and claim expense ratio – current accident year 91.5 % 63.6 % 79.0 % Net claims and claim expense ratio – prior accident years (0.8 )% (3.0 )% (1.8 )% Net claims and claim expense ratio – calendar year 90.7 % 60.6 % 77.2 % Underwriting expense ratio 24.3 % 33.2 % 28.3 % Combined ratio 115.0 % 93.8 % 105.5 % Nine months ended September 30, 2018 Property Casualty and Specialty Other Total Gross premiums written $ 1,561,008 $ 1,201,664 $ — $ 2,762,672 Net premiums written $ 884,541 $ 836,267 $ — $ 1,720,808 Net premiums earned $ 722,246 $ 679,271 $ (1 ) $ 1,401,516 Net claims and claim expenses incurred 222,195 420,273 (88 ) 642,380 Acquisition expenses 127,095 185,429 — 312,524 Operational expenses 75,933 43,121 354 119,408 Underwriting income (loss) $ 297,023 $ 30,448 $ (267 ) 327,204 Net investment income 208,528 208,528 Net foreign exchange losses (11,496 ) (11,496 ) Equity in earnings of other ventures 14,331 14,331 Other income 480 480 Net realized and unrealized losses on investments (86,415 ) (86,415 ) Corporate expenses (21,875 ) (21,875 ) Interest expense (35,304 ) (35,304 ) Income before taxes and redeemable noncontrolling interests 395,453 Income tax expense (2,550 ) (2,550 ) Net income attributable to redeemable noncontrolling interests (90,822 ) (90,822 ) Dividends on preference shares (20,899 ) (20,899 ) Net income available to RenaissanceRe common shareholders $ 281,182 Net claims and claim expenses incurred – current accident year $ 395,067 $ 444,293 $ — $ 839,360 Net claims and claim expenses incurred – prior accident years (172,872 ) (24,020 ) (88 ) (196,980 ) Net claims and claim expenses incurred – total $ 222,195 $ 420,273 $ (88 ) $ 642,380 Net claims and claim expense ratio – current accident year 54.7 % 65.4 % 59.9 % Net claims and claim expense ratio – prior accident years (23.9 )% (3.5 )% (14.1 )% Net claims and claim expense ratio – calendar year 30.8 % 61.9 % 45.8 % Underwriting expense ratio 28.1 % 33.6 % 30.9 % Combined ratio 58.9 % 95.5 % 76.7 %

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
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, 2019 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 Derivative instruments not designated as hedges Interest rate futures $ 175 $ 145 $ 30 Other assets $ — $ 30 Interest rate swaps 5 — 5 Other assets — 5 Foreign currency forward contracts (1) 21,822 — 21,822 Other assets — 21,822 Foreign currency forward contracts (2) 1,105 368 737 Other assets — 737 Credit default swaps 209 — 209 Other assets — 209 Total return swaps 1,177 — 1,177 Other assets — 1,177 Equity futures 555 — 555 Other assets — 555 Total derivative instruments not designated as hedges 25,048 513 24,535 — 24,535 Derivative instruments designated as hedges Foreign currency forward contracts (3) 1,072 — 1,072 Other assets — 1,072 Total derivative instruments designated as hedges 1,072 — 1,072 — 1,072 Total $ 26,120 $ 513 $ 25,607 $ — $ 25,607 Derivative Liabilities At September 30, 2019 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 Derivative instruments not designated as hedges Interest rate futures $ 518 $ 145 $ 373 Other liabilities $ 373 $ — Interest rate swaps 16 — 16 Other liabilities 16 — Foreign currency forward contracts (1) 6,676 497 6,179 Other liabilities — 6,179 Foreign currency forward contracts (2) 1,078 368 710 Other liabilities — 710 Total return swaps 180 — 180 Other liabilities — 180 Total derivative instruments not designated as hedges 8,468 1,010 7,458 389 7,069 Derivative instruments designated as hedges Foreign currency forward contracts (3) — 416 (416 ) Other liabilities — (416 ) Total $ 8,468 $ 1,426 $ 7,042 $ 389 $ 6,653 (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. (3) Contracts designated as hedges of a net investment in a foreign operation. Derivative Assets At December 31, 2018 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 Derivative instruments not designated as hedges Interest rate futures $ 971 $ 636 $ 335 Other assets $ — $ 335 Interest rate swaps 860 — 860 Other assets — 860 Foreign currency forward contracts (1) 16,459 2,260 14,199 Other assets — 14,199 Foreign currency forward contracts (2) 3,194 71 3,123 Other assets — 3,123 Equity futures 1,390 977 413 Other assets — 413 Total $ 22,874 $ 3,944 $ 18,930 $ — $ 18,930 Derivative Liabilities At December 31, 2018 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 Derivative instruments not designated as hedges Interest rate futures $ 910 $ 636 $ 273 Other liabilities $ 273 $ — Interest rate swaps 506 — 506 Other liabilities 254 252 Foreign currency forward contracts (1) 4,154 — 4,154 Other liabilities — 4,154 Foreign currency forward contracts (2) 72 71 1 Other liabilities — 1 Credit default swaps 1,606 — 1,606 Other liabilities 1,605 1 Equity futures 977 977 — Other liabilities — — Total $ 8,225 $ 1,684 $ 6,540 $ 2,132 $ 4,408 (1) Contracts used to manage foreign currency risks in underwriting and non-investment operations. (2)
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, 2019 2018 Derivative instruments not designated as hedges Interest rate futures Net realized and unrealized gains (losses) on investments $ 7,199 $ 2,731 Interest rate swaps Net realized and unrealized gains (losses) on investments 887 (6 ) Foreign currency forward contracts (1) Net foreign exchange losses (5,912 ) (2,596 ) Foreign currency forward contracts (2) Net foreign exchange losses 911 650 Credit default swaps Net realized and unrealized gains (losses) on investments 65 (191 ) Total return swaps Net realized and unrealized gains (losses) on investments 1,960 — Equity futures Net realized and unrealized gains (losses) on investments 1,023 29 Total derivative instruments not designated as hedges 6,133 617 Derivative instruments designated as hedges Foreign currency forward contracts (3) Accumulated other comprehensive income (loss) 3,264 — Total $ 9,397 $ 617 Location of gain (loss) recognized on derivatives Amount of gain (loss) recognized on derivatives Nine months ended September 30, 2019 2018 Derivative instruments not designated as hedges Interest rate futures Net realized and unrealized gains (losses) on investments $ 35,136 $ 292 Interest rate swaps Net realized and unrealized gains (losses) on investments 2,071 129 Foreign currency forward contracts (1) Net foreign exchange losses (13,086 ) (2,227 ) Foreign currency forward contracts (2) Net foreign exchange losses (1,370 ) 1,302 Credit default swaps Net realized and unrealized gains (losses) on investments 5,521 (1,228 ) Total return swaps Net realized and unrealized gains (losses) on investments 6,995 — Equity futures Net realized and unrealized gains (losses) on investments 12,380 44 Total derivative instruments not designated as hedges 47,647 (1,688 ) Derivative instruments designated as hedges Foreign currency forward contracts (3) Accumulated other comprehensive income (loss) 4,108 — Total $ 51,755 $ (1,688 ) (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. (3) Contracts designated as hedges of a net investment in a foreign operation.
Schedule of Derivative Instruments Designated as Hedges of a Net Investment in a Foreign Operation	The table below provides a summary of derivative instruments designated as hedges of a net investment in a foreign operation, including the weighted average U.S. dollar equivalent of foreign denominated net assets that were hedged and the resulting derivative gain that was recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive loss on the Company’s consolidated statements of changes in shareholders’ equity: Three months ended Nine months ended September 30, September 30, September 30, September 30, Weighted average of U.S. dollar equivalent of foreign denominated net assets $ 79,538 $ — $ 80,303 $ — Derivative gains (1) $ 3,264 $ — $ 4,108 $ — (1) Derivative gains from derivative instruments designated as hedges of the net investment in a foreign operation are recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive loss on the Company’s consolidated statements of changes in shareholders’ equity.

Commitments, Contingencies an_2

Commitments, Contingencies and Other Items (Tables)	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Existing Operating Leases	Future minimum lease payments under existing operating and finance leases are detailed below, excluding the bargain renewal option on the finance lease related to office space in Bermuda: Future minimum lease payments Operating leases Finance leases 2019 (remaining) $ 2,256 $ 833 2020 6,625 3,336 2021 6,397 3,336 2022 5,681 3,336 2023 2,690 2,830 2024 1,301 2,661 After 2024 923 10,129 Future minimum lease payments under existing leases $ 25,873 $ 26,461
Schedule of Future Minimum Lease Payments Under Existing Finance Leases	Future minimum lease payments under existing operating and finance leases are detailed below, excluding the bargain renewal option on the finance lease related to office space in Bermuda: Future minimum lease payments Operating leases Finance leases 2019 (remaining) $ 2,256 $ 833 2020 6,625 3,336 2021 6,397 3,336 2022 5,681 3,336 2023 2,690 2,830 2024 1,301 2,661 After 2024 923 10,129 Future minimum lease payments under existing leases $ 25,873 $ 26,461

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2019
Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries [Abstract]
Schedule of Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheet at September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Assets Total investments $ 138,084 $ 117,077 $ 18,987 $ 16,673,745 $ — $ 16,947,893 Cash and cash equivalents 5,099 3,691 3,324 859,137 — 871,251 Investments in subsidiaries 5,579,191 50,786 1,279,042 — (6,909,019 ) — Due from subsidiaries and affiliates 8,595 101,579 — — (110,174 ) — Premiums receivable — — — 2,799,954 — 2,799,954 Prepaid reinsurance premiums — — — 972,047 — 972,047 Reinsurance recoverable — — — 2,438,299 — 2,438,299 Accrued investment income 39 208 9 73,253 — 73,509 Deferred acquisition costs — — — 708,258 — 708,258 Receivable for investments sold 482 1 — 224,664 — 225,147 Other assets 795,636 13,853 295,885 (1,806,661 ) 1,045,880 344,593 Goodwill and other intangible assets 117,278 — — 145,981 — 263,259 Total assets $ 6,644,404 $ 287,195 $ 1,597,247 $ 23,088,677 $ (5,973,313 ) $ 25,644,210 Liabilities, Noncontrolling Interests and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ 8,602,437 $ — $ 8,602,437 Unearned premiums — — — 2,967,535 — 2,967,535 Debt 691,245 — 843,981 148,272 (300,000 ) 1,383,498 Amounts due to subsidiaries and affiliates 2,803 92 101,827 — (104,722 ) — Reinsurance balances payable — — — 2,910,601 — 2,910,601 Payable for investments purchased — 10 — 654,675 — 654,685 Other liabilities (879 ) 328 9,381 375,211 11,145 395,186 Total liabilities 693,169 430 955,189 15,658,731 (393,577 ) 16,913,942 Redeemable noncontrolling interests — — — 2,779,033 — 2,779,033 Shareholders’ Equity Total shareholders’ equity 5,951,235 286,765 642,058 4,650,913 (5,579,736 ) 5,951,235 Total liabilities, noncontrolling interests and shareholders’ equity $ 6,644,404 $ 287,195 $ 1,597,247 $ 23,088,677 $ (5,973,313 ) $ 25,644,210 (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, 2018 RenaissanceRe Holdings Ltd. (Parent Guarantor) RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-guarantor Subsidiaries) (1) Consolidating Adjustments (2) RenaissanceRe Consolidated Assets Total investments $ 313,360 $ 77,842 $ 28,885 $ 11,465,660 $ — $ 11,885,747 Cash and cash equivalents 3,534 3,350 9,604 1,091,434 — 1,107,922 Investments in subsidiaries 4,414,475 58,458 1,215,663 — (5,688,596 ) — Due from subsidiaries and affiliates 57,039 101,579 — — (158,618 ) — Premiums receivable — — — 1,537,188 — 1,537,188 Prepaid reinsurance premiums — — — 616,185 — 616,185 Reinsurance recoverable — — — 2,372,221 — 2,372,221 Accrued investment income 1,046 310 127 49,828 — 51,311 Deferred acquisition costs — — — 476,661 — 476,661 Receivable for investments sold 203 23,885 — 232,328 — 256,416 Other assets 458,842 22,571 313,636 (1,403,636 ) 743,714 135,127 Goodwill and other intangible assets 120,476 — — 116,942 — 237,418 Total assets $ 5,368,975 $ 287,995 $ 1,567,915 $ 16,554,811 $ (5,103,500 ) $ 18,676,196 Liabilities, Redeemable Noncontrolling Interest and Shareholders’ Equity Liabilities Reserve for claims and claim expenses $ — $ — $ — $ 6,076,271 $ — $ 6,076,271 Unearned premiums — — — 1,716,021 — 1,716,021 Debt 300,000 — 843,086 148,041 (300,000 ) 991,127 Amounts due to subsidiaries and affiliates 6,453 217 102,243 — (108,913 ) — Reinsurance balances payable — — — 1,902,056 — 1,902,056 Payable for investments purchased — 24 — 380,308 — 380,332 Other liabilities 17,442 5,362 13,918 482,422 (5,535 ) 513,609 Total liabilities 323,895 5,603 959,247 10,705,119 (414,448 ) 11,579,416 Redeemable noncontrolling interests — — — 2,051,700 — 2,051,700 Shareholders’ Equity Total shareholders’ equity 5,045,080 282,392 608,668 3,797,992 (4,689,052 ) 5,045,080 Total liabilities, redeemable noncontrolling interest and shareholders’ equity $ 5,368,975 $ 287,995 $ 1,567,915 $ 16,554,811 $ (5,103,500 ) $ 18,676,196 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Schedule of Condensed Consolidating Statements of Operations	Condensed Consolidating Statement of Operations for RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 906,748 $ — $ 906,748 Net investment income 10,263 570 1,906 113,705 (12,600 ) 113,844 Net foreign exchange (losses) gains (14,786 ) — — 6,511 — (8,275 ) Equity in earnings of other ventures — — 1,298 4,579 — 5,877 Other income (loss) 1,234 — — (218 ) — 1,016 Net realized and unrealized gains on investments 1,983 1,147 20 28,788 — 31,938 Total revenues (1,306 ) 1,717 3,224 1,060,113 (12,600 ) 1,051,148 Expenses Net claims and claim expenses incurred — — — 654,520 — 654,520 Acquisition expenses — — — 202,181 — 202,181 Operational expenses 2,039 11 9,018 34,814 7,533 53,415 Corporate expenses 6,948 — 7 5,010 1,879 13,844 Interest expense 5,708 — 9,257 615 — 15,580 Total expenses 14,695 11 18,282 897,140 9,412 939,540 (Loss) income before equity in net income of subsidiaries and taxes (16,001 ) 1,706 (15,058 ) 162,973 (22,012 ) 111,608 Equity in net income of subsidiaries 61,021 1,456 14,365 — (76,842 ) — Income (loss) before taxes 45,020 3,162 (693 ) 162,973 (98,854 ) 111,608 Income tax benefit (expense) 867 (319 ) 1,562 (5,774 ) — (3,664 ) Net income 45,887 2,843 869 157,199 (98,854 ) 107,944 Net income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Net income attributable to RenaissanceRe 45,887 2,843 869 95,142 (98,854 ) 45,887 Dividends on preference shares (9,189 ) — — — — (9,189 ) Net income available attributable to RenaissanceRe common shareholders $ 36,698 $ 2,843 $ 869 $ 95,142 $ (98,854 ) $ 36,698 (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 three months ended September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 45,887 $ 2,843 $ 869 $ 157,199 $ (98,854 ) $ 107,944 Change in net unrealized gains on investments — — — 608 — 608 Foreign currency translation adjustments, net of tax — — — 8,249 — 8,249 Comprehensive income 45,887 2,843 869 166,056 (98,854 ) 116,801 Net income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to RenaissanceRe $ 45,887 $ 2,843 $ 869 $ 103,999 $ (98,854 ) $ 54,744 (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 RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 2,368,278 $ — $ 2,368,278 Net investment income 29,216 1,689 5,983 308,001 (33,751 ) 311,138 Net foreign exchange (losses) gains (20,846 ) — — 19,034 — (1,812 ) Equity in earnings of other ventures — — 2,915 14,435 — 17,350 Other income 1,234 — — 3,875 — 5,109 Net realized and unrealized gains on investments 7,501 15,369 231 373,485 — 396,586 Total revenues 17,105 17,058 9,129 3,087,108 (33,751 ) 3,096,649 Expenses Net claims and claim expenses incurred — — — 1,334,928 — 1,334,928 Acquisition expenses — — — 553,614 — 553,614 Operational expenses 4,643 38 29,958 98,613 24,910 158,162 Corporate expenses 49,618 — 16 21,172 5,674 76,480 Interest expense 13,284 — 27,763 1,821 — 42,868 Total expenses 67,545 38 57,737 2,010,148 30,584 2,166,052 (Loss) income before equity in net income of subsidiaries and taxes (50,440 ) 17,020 (48,608 ) 1,076,960 (64,335 ) 930,597 Equity in net income of subsidiaries 754,634 4,001 76,552 — (835,187 ) — Income before taxes 704,194 21,021 27,944 1,076,960 (899,522 ) 930,597 Income tax benefit (expense) 1,642 (3,472 ) 4,956 (23,796 ) — (20,670 ) Net income 705,836 17,549 32,900 1,053,164 (899,522 ) 909,927 Net income attributable to redeemable noncontrolling interests — — — (204,091 ) — (204,091 ) Net income attributable to RenaissanceRe 705,836 17,549 32,900 849,073 (899,522 ) 705,836 Dividends on preference shares (27,567 ) — — — — (27,567 ) Net income available to RenaissanceRe common shareholders $ 678,269 $ 17,549 $ 32,900 $ 849,073 $ (899,522 ) $ 678,269 (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 RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 531,849 $ — $ 531,849 Net investment income 6,542 539 1,541 80,472 (8,398 ) 80,696 Net foreign exchange gains (losses) 3 — — (4,569 ) — (4,566 ) Equity in earnings of other ventures — — 290 7,358 — 7,648 Other income — — — 497 — 497 Net realized and unrealized (losses) gains on investments (176 ) 4,479 (73 ) 9,400 — 13,630 Total revenues 6,369 5,018 1,758 625,007 (8,398 ) 629,754 Expenses Net claims and claim expenses incurred — — — 410,510 — 410,510 Acquisition expenses — — — 109,761 — 109,761 Operational expenses 3,570 29 7,493 42,682 (13,181 ) 40,593 Corporate expenses 3,778 — — 3,063 — 6,841 Interest expense 1,478 — 9,257 2,512 (1,478 ) 11,769 Total expenses 8,826 29 16,750 568,528 (14,659 ) 579,474 (Loss) income before equity in net income of subsidiaries and taxes (2,457 ) 4,989 (14,992 ) 56,479 6,261 50,280 Equity in net income of subsidiaries 45,130 2,735 11,666 — (59,531 ) — Income before taxes 42,673 7,724 (3,326 ) 56,479 (53,270 ) 50,280 Income tax (expense) benefit (284 ) (1,026 ) 1,840 (1,981 ) — (1,451 ) Net income (loss) 42,389 6,698 (1,486 ) 54,498 (53,270 ) 48,829 Net income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Net income (loss) attributable to RenaissanceRe 42,389 6,698 (1,486 ) 48,058 (53,270 ) 42,389 Dividends on preference shares (9,708 ) — — — — (9,708 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 32,681 $ 6,698 $ (1,486 ) $ 48,058 $ (53,270 ) $ 32,681 (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, 2018 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 42,389 $ 6,698 $ (1,486 ) $ 54,498 $ (53,270 ) $ 48,829 Change in net unrealized gains on investments — — — (382 ) — (382 ) Comprehensive income (loss) 42,389 6,698 (1,486 ) 54,116 (53,270 ) 48,447 Net income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income (loss) attributable to RenaissanceRe $ 42,389 $ 6,698 $ (1,486 ) $ 47,676 $ (53,270 ) $ 42,007 (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, 2018 RenaissanceRe RenRe North Inc. RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Revenues Net premiums earned $ — $ — $ — $ 1,401,516 $ — $ 1,401,516 Net investment income 18,504 1,629 3,981 208,034 (23,620 ) 208,528 Net foreign exchange losses (1 ) — — (11,495 ) — (11,496 ) Equity in earnings of other ventures — — 2,045 12,286 — 14,331 Other income — — — 480 — 480 Net realized and unrealized (losses) gains on investments (821 ) 4,906 (399 ) (90,101 ) — (86,415 ) Total revenues 17,682 6,535 5,627 1,520,720 (23,620 ) 1,526,944 Expenses Net claims and claim expenses incurred — — — 642,380 — 642,380 Acquisition expenses — — — 312,524 — 312,524 Operational expenses 7,551 60 26,737 113,721 (28,661 ) 119,408 Corporate expenses 12,498 — 7 9,370 — 21,875 Interest expense 3,694 — 27,763 7,541 (3,694 ) 35,304 Total expenses 23,743 60 54,507 1,085,536 (32,355 ) 1,131,491 (Loss) income before equity in net income of subsidiaries and taxes (6,061 ) 6,475 (48,880 ) 435,184 8,735 395,453 Equity in net income of subsidiaries 310,081 4,285 29,005 — (343,371 ) — Income (loss) before taxes 304,020 10,760 (19,875 ) 435,184 (334,636 ) 395,453 Income tax (expense) benefit (1,939 ) (1,273 ) 5,677 (5,015 ) — (2,550 ) Net income (loss) 302,081 9,487 (14,198 ) 430,169 (334,636 ) 392,903 Net income attributable to redeemable noncontrolling interests — — — (90,822 ) — (90,822 ) Net income (loss) attributable to RenaissanceRe 302,081 9,487 (14,198 ) 339,347 (334,636 ) 302,081 Dividends on preference shares (20,899 ) — — — — (20,899 ) Net income (loss) available (attributable) to RenaissanceRe common shareholders $ 281,182 $ 9,487 $ (14,198 ) $ 339,347 $ (334,636 ) $ 281,182 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor and Subsidiary Issuer consolidating adjustments.
Schedule of Condensed Consolidating Statement of Comprehensive Income (Loss)	Condensed Consolidating Statement of Comprehensive Income (Loss) for the three months ended September 30, 2018 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 42,389 $ 6,698 $ (1,486 ) $ 54,498 $ (53,270 ) $ 48,829 Change in net unrealized gains on investments — — — (382 ) — (382 ) Comprehensive income (loss) 42,389 6,698 (1,486 ) 54,116 (53,270 ) 48,447 Net income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (6,440 ) — (6,440 ) Comprehensive income (loss) attributable to RenaissanceRe $ 42,389 $ 6,698 $ (1,486 ) $ 47,676 $ (53,270 ) $ 42,007 (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 nine months ended September 30, 2018 RenaissanceRe RenRe North Inc. RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income (loss) Net income (loss) $ 302,081 $ 9,487 $ (14,198 ) $ 430,169 $ (334,636 ) $ 392,903 Change in net unrealized gains on investments — — — (1,707 ) — (1,707 ) Comprehensive income (loss) 302,081 9,487 (14,198 ) 428,462 (334,636 ) 391,196 Net income attributable to redeemable noncontrolling interests — — — (90,822 ) — (90,822 ) Comprehensive income attributable to noncontrolling interests — — — (90,822 ) — (90,822 ) Comprehensive income (loss) attributable to RenaissanceRe $ 302,081 $ 9,487 $ (14,198 ) $ 337,640 $ (334,636 ) $ 300,374 (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 three months ended September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance, Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 45,887 $ 2,843 $ 869 $ 157,199 $ (98,854 ) $ 107,944 Change in net unrealized gains on investments — — — 608 — 608 Foreign currency translation adjustments, net of tax — — — 8,249 — 8,249 Comprehensive income 45,887 2,843 869 166,056 (98,854 ) 116,801 Net income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to redeemable noncontrolling interests — — — (62,057 ) — (62,057 ) Comprehensive income attributable to RenaissanceRe $ 45,887 $ 2,843 $ 869 $ 103,999 $ (98,854 ) $ 54,744 (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, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other Consolidating RenaissanceRe Comprehensive income Net income $ 705,836 $ 17,549 $ 32,900 $ 1,053,164 $ (899,522 ) $ 909,927 Change in net unrealized gains on investments — — — 1,880 — 1,880 Foreign currency translation adjustments, net of tax — — — 4,541 — 4,541 Comprehensive income 705,836 17,549 32,900 1,059,585 (899,522 ) 916,348 Net income attributable to redeemable noncontrolling interests — — — (204,091 ) — (204,091 ) Comprehensive income attributable to noncontrolling interests — — — (204,091 ) — (204,091 ) Comprehensive income attributable to RenaissanceRe $ 705,836 $ 17,549 $ 32,900 $ 855,494 $ (899,522 ) $ 712,257 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. (2) Includes Parent Guarantor, Subsidiary Guarantor and Subsidiary Issuer consolidating adjustments.
Schedule of Condensed Consolidating Statements of Cash Flows	Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2019 RenaissanceRe RenRe North RenaissanceRe Finance Inc. (Subsidiary Issuer) Other RenaissanceRe Consolidated Cash flows (used in) provided by operating activities Net cash (used in) provided by operating activities $ (381,508 ) $ 1,316 $ (30,943 ) $ 1,675,567 $ 1,264,432 Cash flows provided by (used in) investing activities Proceeds from sales and maturities of fixed maturity investments trading 277,030 51,669 43,746 12,463,471 12,835,916 Purchases of fixed maturity investments trading (66,740 ) (50,549 ) (15,910 ) (13,270,512 ) (13,403,711 ) Net purchases of equity investments trading — (2,476 ) — (4,461 ) (6,937 ) Net (purchases) sales of short term investments (34,209 ) 506 (16,257 ) (1,312,191 ) (1,362,151 ) Net purchases of other investments — — — (130,476 ) (130,476 ) Net purchases of investments in other ventures — — — (2,341 ) (2,341 ) Return of investment from investments in other ventures — — — 11,250 11,250 Net purchases of other assets — — — (4,108 ) (4,108 ) Dividends and return of capital from subsidiaries 855,396 — 13,500 (868,896 ) — Contributions to subsidiaries (1,013,916 ) — — 1,013,916 — Due (from) to subsidiary 48,444 (125 ) (416 ) (47,903 ) — Net purchase of the TMR Group Entities — — — (276,206 ) (276,206 ) Net cash provided by (used in) investing activities 66,005 (975 ) 24,663 (2,428,457 ) (2,338,764 ) Cash flows provided by financing activities Dividends paid – RenaissanceRe common shares (44,547 ) — — — (44,547 ) Dividends paid – preference shares (27,567 ) — — — (27,567 ) Issuance of debt, net of expenses 396,411 — — — 396,411 Net third party redeemable noncontrolling interest share transactions — — — 515,952 515,952 Taxes paid on withholding shares (7,229 ) — — — (7,229 ) Net cash provided by financing activities 317,068 — — 515,952 833,020 Effect of exchange rate changes on foreign currency cash — — — 4,641 4,641 Net increase (decrease) in cash and cash equivalents 1,565 341 (6,280 ) (232,297 ) (236,671 ) Cash and cash equivalents, beginning of period 3,534 3,350 9,604 1,091,434 1,107,922 Cash and cash equivalents, end of period $ 5,099 $ 3,691 $ 3,324 $ 859,137 $ 871,251 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations. Condensed Consolidating Statement of Cash Flows for the nine months ended September 30, 2018 RenaissanceRe RenRe North Inc. 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 $ (5,869 ) $ 1,496 $ 16,194 $ 876,705 $ 888,526 Cash flows used in investing activities Proceeds from sales and maturities of fixed maturity investments trading 384,818 91,118 45,459 7,700,086 8,221,481 Purchases of fixed maturity investments trading (281,994 ) (65,988 ) (20,806 ) (8,323,900 ) (8,692,688 ) Net (purchases) sales of equity investments trading — (624 ) — 16,114 15,490 Net sales (purchases) of short term investments 85,598 360 (9,206 ) (1,542,203 ) (1,465,451 ) Net purchases of other investments — — — (130,649 ) (130,649 ) Net purchases of investments in other ventures — — — (20,952 ) (20,952 ) Return of investment from investment in other ventures — — — 8,464 8,464 Dividends and return of capital from subsidiaries 511,098 — — (511,098 ) — Contributions to subsidiaries (686,106 ) (16,847 ) (65,000 ) 767,953 — Due (from) to subsidiaries (193,249 ) (9,598 ) 36,262 166,585 — Net cash used in investing activities (179,835 ) (1,579 ) (13,291 ) (1,869,600 ) (2,064,305 ) Cash flows provided by financing activities Dividends paid – RenaissanceRe common shares (39,611 ) — — — (39,611 ) Dividends paid – preference shares (20,899 ) — — — (20,899 ) Issuance of preference shares, net of expenses 242,371 — — — 242,371 Net third party redeemable noncontrolling interest share transactions — — — 96,021 96,021 Taxes paid on withholding shares (7,079 ) — — — (7,079 ) Net cash provided by financing activities 174,782 — — 96,021 270,803 Effect of exchange rate changes on foreign currency cash — — — (3,575 ) (3,575 ) Net (decrease) increase in cash and cash equivalents (10,922 ) (83 ) 2,903 (900,449 ) (908,551 ) Cash and cash equivalents, beginning of period 14,656 139 1,469 1,345,328 1,361,592 Cash and cash equivalents, end of period $ 3,734 $ 56 $ 4,372 $ 444,879 $ 453,041 (1) Includes all other subsidiaries of RenaissanceRe Holdings Ltd. and eliminations.

Organization (Details)

Organization (Details)	9 Months Ended
	Sep. 30, 2019
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%

Acquisition of Tokio Millenni_3

Acquisition of Tokio Millennium Re (Overview) (Details) - TMR Group Entities - USD ($) $ in Thousands	Mar. 22, 2019	Sep. 30, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Net purchase price	$ 1,563,593
Corporate expenses associated with the acquisition		$ 4,000	$ 44,000

Acquisition of Tokio Millenni_4

Acquisition of Tokio Millennium Re (Purchase Price) (Details) - TMR Group Entities - USD ($) $ / shares in Units, $ in Thousands	Mar. 22, 2019	Mar. 15, 2019
Business Acquisition [Line Items]
Special Dividend paid to common shareholders of Tokio and holders of Tokio equity awards	$ 500,000
Common shares issued by RenaissanceRe to Tokio (in shares)	1,739,071
Common share price of RenaissanceRe (in dollars per share)	$ 143.75	$ 143.7539
Market value of RenaissanceRe common shares issued by RenaissanceRe to Tokio	$ 249,998
Cash consideration paid by RenaissanceRe as acquisition consideration	813,595
Total purchase price	1,563,593
Less: Special Dividend paid to Tokio	(500,000)
Net purchase price	$ 1,063,593
Common share price, trading volume, term		30 days

Acquisition of Tokio Millenni_5

Acquisition of Tokio Millennium Re Acquisition of Tokio Millennium Re (Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR Group Entities $ in Thousands	Mar. 22, 2019USD ($)state	Mar. 31, 2019USD ($)
Business Acquisition [Line Items]
Goodwill	$ 13,094	$ 13,100
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	$ 11,200
Acquired finite-lived intangibles, weighted average amortization period	10 years 6 months
Identifiable indefinite lived intangible assets (insurance licenses)	$ 6,800
Value of business acquired, amortization period	2 years
Value of business acquired	$ 287,600
Deferred tax liability related to the estimated fair value of the intangible assets recorded	2,281
Deferred tax liability related to other adjustments	2,606
Insurance licenses
Business Acquisition [Line Items]
Identifiable indefinite lived intangible assets (insurance licenses)	$ 6,800
Number of states, ability to write reinsurance | state	50

Acquisition of Tokio Millenni_6

Acquisition of Tokio Millennium Re (Schedule of Fair Value of Net Assets Acquired and Liabilities Assumed) (Details) - TMR Group Entities - USD ($) $ in Thousands	Mar. 22, 2019	Sep. 30, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Shareholders’ equity of the TMR Group Entities at March 22, 2019	$ 1,032,961
Adjustments for fair value, by applicable balance sheet caption:
Net deferred acquisition costs and value of business acquired	(56,788)
Net reserve for claims and claim expenses	67,782
Goodwill and intangible assets at March 22, 2019 of the TMR Group Entities	(6,569)
Total adjustments for fair value by applicable balance sheet caption before tax impact	4,425
Other assets - net deferred tax liability related to fair value adjustments and value of business acquired	(2,606)
Total adjustments for fair value by applicable balance sheet caption, net of tax	1,819
Adjustments for fair value of the identifiable intangible assets:
Identifiable indefinite lived intangible assets (insurance licenses)	6,800
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	11,200
Identifiable intangible assets before tax impact	18,000	$ 17,460
Other assets - deferred tax liability on identifiable intangible assets	(2,281)
Total adjustments for fair value of the identifiable intangible assets and value of business acquired, net of tax	15,719
Total adjustments for fair value by applicable balance sheet caption, identifiable intangible assets and value of business acquired, net of tax	17,538
Shareholders’ equity of the TMR Group Entities at fair value	1,050,499
Total net purchase price paid by RenaissanceRe	1,063,593
Excess purchase price over the fair value of net assets acquired assigned to goodwill	13,094		$ 13,100
Insurance licenses
Adjustments for fair value of the identifiable intangible assets:
Identifiable indefinite lived intangible assets (insurance licenses)	6,800
Top Broker Relationships and Renewal Rights
Adjustments for fair value of the identifiable intangible assets:
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	$ 11,200

Acquisition of Tokio Millenni_7

Acquisition of Tokio Millennium RE (Identifiable Intangible Assets) (Details) - TMR Group Entities - USD ($) $ in Thousands	Mar. 22, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	$ 11,200
Intangible assets acquired	6,800
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Accumulated amortization (from March 22, 2019 through September 30, 2019)		$ 540
Net identifiable intangible assets related to the acquisition of the TMR Group Entities at September 30, 2019	$ 18,000	$ 17,460
Economic Useful Life	10 years 6 months
Insurance licenses
Business Acquisition [Line Items]
Intangible assets acquired	$ 6,800
Top broker relationships
Business Acquisition [Line Items]
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	$ 10,000
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	10 years
Renewal rights
Business Acquisition [Line Items]
Identifiable finite lived intangible assets (top broker relationships and renewal rights)	$ 1,200
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward]
Economic Useful Life	15 years

Acquisition of Tokio Millenni_8

Acquisition of Tokio Millennium Re (Financial Results) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Total revenues	$ 1,051,148	$ 629,754	$ 3,096,649	$ 1,526,944
Net income available to RenaissanceRe common shareholders	36,698	$ 32,681	678,269	$ 281,182
TMR Group Entities
Business Acquisition [Line Items]
Total revenues	313,250		730,080
Net income available to RenaissanceRe common shareholders	31,672		97,068
Corporate expenses associated with the acquisition	$ 4,000		$ 44,000

Acquisition of Tokio Millenni_9

Acquisition of Tokio Millennium Re (Taxation) (Details) - TMR Group Entities $ in Millions	Mar. 22, 2019USD ($)
Business Acquisition [Line Items]
Other assets - net deferred tax liability related to fair value adjustments and value of business acquired	$ 5.7
Deferred tax assets, valuation allowance	$ 35.7

Acquisition of Tokio Millenn_10

Acquisition of Tokio Millennium Re (Supplemental Pro Forma Information) (Details) - TMR Group Entities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Total revenues	$ 1,051,148	$ 930,825	$ 3,437,674	$ 2,478,934
Net income available to RenaissanceRe common shareholders	$ 36,698	$ 59,174	$ 734,946	$ 309,715

Acquisition of Tokio Millenn_11

Acquisition of Tokio Millennium Re (Defined Benefit Pension Plan) (Details) - Pension Plan - TMR Group Entities $ in Millions	Mar. 22, 2019USD ($)
Business Acquisition [Line Items]
Net balance sheet liability	$ 6.1
Projected benefit obligation	21.2
Plan assets at fair value	$ 15.1

Investments (Schedule of Fair V

Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Total fixed maturity investments trading	$ 11,386,228	$ 8,088,870
U.S. treasuries
Investment [Line Items]
Total fixed maturity investments trading	4,314,006	3,331,411
Agencies
Investment [Line Items]
Total fixed maturity investments trading	507,903	174,883
Municipal
Investment [Line Items]
Total fixed maturity investments trading	1,629	6,854
Non-U.S. government
Investment [Line Items]
Total fixed maturity investments trading	379,154	279,818
Non-U.S. government-backed corporate
Investment [Line Items]
Total fixed maturity investments trading	263,170	160,063
Corporate
Investment [Line Items]
Total fixed maturity investments trading	3,453,222	2,450,244
Agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	1,248,722	817,880
Non-agency mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	261,850	278,680
Commercial mortgage-backed
Investment [Line Items]
Total fixed maturity investments trading	406,268	282,294
Asset-backed
Investment [Line Items]
Total fixed maturity investments trading	$ 550,304	$ 306,743

Investments (Schedule of Contra

Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Amortized Cost
Due in less than one year	$ 605,595
Due after one through five years	5,820,074
Due after five through ten years	2,170,132
Due after ten years	179,147
Amortized Cost	11,214,394	$ 8,163,962
Fair Value
Due in less than one year	603,806
Due after one through five years	5,893,946
Due after five through ten years	2,232,264
Due after ten years	189,068
Fair Value	11,386,228	8,088,870
Mortgage-backed
Amortized Cost
Amortized Cost	1,888,719
Fair Value
Fair Value	1,916,840
Asset-backed
Amortized Cost
Amortized Cost	550,727
Fair Value
Fair Value	$ 550,304	$ 306,743

Investments (Schedule of Fair_2

Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 379,422	$ 310,252
Financials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	207,073	200,357
Communications and technology
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	70,057	42,333
Industrial, utilities and energy
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	36,703	24,520
Consumer
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	34,384	20,639
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	26,051	18,925
Basic materials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 5,154	$ 3,478

Investments (Pledged Investment

Investments (Pledged Investments) (Details) - USD ($) $ in Billions	Sep. 30, 2019	Dec. 31, 2018
Investments [Abstract]
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties	$ 7.1	$ 5.7
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities	$ 2.9	$ 2

Investments (Reverse Purchase A

Investments (Reverse Purchase Agreements) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 188.2	$ 3.7
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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 119,283	$ 84,523	$ 324,927	$ 219,418
Investment expenses	(5,439)	(3,827)	(13,789)	(10,890)
Net investment income	113,844	80,696	311,138	208,528
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	82,977	55,725	232,566	151,784
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	15,061	9,403	44,712	22,340
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	1,326	903	3,269	3,091
Private equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	(4,597)	8,723	8,166	12,149
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	22,538	8,665	30,413	27,346
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 1,978	$ 1,104	$ 5,801	$ 2,708

Investments (Schedule of Net Re

Investments (Schedule of Net Realized and Unrealized (Losses) Gains on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 31,938	$ 13,630	$ 396,586	$ (86,415)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Gross realized gains	34,710	5,229	87,595	14,945
Gross realized losses	(4,609)	(15,327)	(34,769)	(67,699)
Net realized gains (losses) on fixed maturity investments	30,101	(10,098)	52,826	(52,754)
Net unrealized gains (losses) on fixed maturity investments trading	17,226	(8,730)	243,139	(73,522)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments-related derivatives	11,134	2,563	62,103	(763)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized (losses) gains on equity investments trading sold during the period	(72)
Net realized (losses) gains on equity investments trading sold during the period		21,259	30,666	21,841
Net unrealized (losses) gains on equity investments trading still held at reporting date	(26,451)
Net unrealized (losses) gains on equity investments trading still held at reporting date		8,636	7,852	18,783
Net realized and unrealized (losses) gains on equity investments trading	$ (26,523)	$ 29,895	$ 38,518	$ 40,624

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	$ 11,386,228	$ 8,088,870
Equity investments trading	379,422	310,252
Other investments	962,109	784,933
Other assets	37,820	4,968
Other liabilities	(31,601)	(13,327)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	11,386,228	8,088,870
Short term investments	4,116,156	2,586,520
Equity investments trading	379,422	310,252
Other investments	962,109	784,933
Other assets	24,784	4,040
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	16,868,699	11,774,615
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	4,314,006	3,331,411
Short term investments	0	0
Equity investments trading	379,422	310,252
Other investments	0	0
Other assets	212	484
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	4,693,640	3,642,147
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	7,072,222	4,757,459
Short term investments	4,116,156	2,586,520
Equity investments trading	0	0
Other investments	659,466	516,571
Other assets	18,353	11,915
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	11,866,197	7,872,465
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	74,210	54,545
Other assets	6,219
Other liabilities		(8,359)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	80,429	46,186
Fair Value, Measurements, Recurring | U.S. treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	4,314,006	3,331,411
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	4,314,006	3,331,411
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	507,903	174,883
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	507,903	174,883
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	1,629	6,854
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	1,629	6,854
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
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	379,154	279,818
Fair Value, Measurements, Recurring | Non-U.S. government | 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 | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	379,154	279,818
Fair Value, Measurements, Recurring | Non-U.S. government | 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	263,170	160,063
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	263,170	160,063
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	3,453,222	2,450,244
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	3,453,222	2,450,244
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	1,248,722	817,880
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	1,248,722	817,880
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	261,850	278,680
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	261,850	278,680
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	406,268	282,294
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	406,268	282,294
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	550,304	306,743
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	550,304	306,743
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	659,466	516,571
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	659,466	516,571
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 investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	266,048	242,647
Fair Value, Measurements, Recurring | Private equity investments | 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 investments | 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 investments | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	74,210	54,545
Fair Value, Measurements, Recurring | Senior secured bank loan funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	24,567	14,482
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	12,028	11,233
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	6,219
Other liabilities		(8,359)
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	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	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	6,219
Other liabilities		(8,359)
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	37,800	5,000
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 liabilities	(31,600)	(13,300)
Fair Value, Measurements, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	18,565	12,399
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	212	484
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	18,353	11,915
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	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 962,109,000		$ 962,109,000		$ 784,933,000
Other assets	37,820,000		37,820,000		4,968,000
Other liabilities	31,601,000		31,601,000		13,327,000
Debt	1,383,498,000		1,383,498,000		991,127,000
Long-term debt, fair value	1,460,184,000		1,460,184,000		974,714,000
Net unrealized gains recognized in earnings			7,284,000	$ 17,778,000
Net investment income | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains recognized in earnings	5,100,000	$ 9,100,000	7,300,000	17,800,000
Other income (loss) | Other assets and (liabilities)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains recognized in earnings	0	$ 0	0	$ 0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	962,109,000		962,109,000		784,933,000
Other assets	24,784,000		24,784,000		4,040,000
Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	266,048,000		266,048,000		242,647,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	74,210,000		74,210,000		54,545,000
Other assets	6,219,000		6,219,000
Other liabilities					8,359,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	74,210,000		74,210,000		$ 54,545,000
Significant Unobservable Inputs (Level 3) | External valuation model | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	10,455,000		10,455,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	63,755,000		63,755,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed reinsurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	500,000		500,000
Other liabilities	9,242,000		9,242,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	14,977,000		14,977,000
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 228,433,000		$ 228,433,000
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.70%		2.50%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.00%		2.00%		3.00%
Municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%		4.80%
Non-U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.70%		2.70%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.00%		2.00%		2.80%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%		4.90%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.50%		2.50%		3.50%
Weighted average life			4 years 8 months 12 days	7 years 1 month 6 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.30%		3.30%		4.40%
Weighted average life			4 years 8 months 12 days	4 years 8 months 12 days
Alt-A non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.70%		3.70%		4.70%
Weighted average life			6 years 7 months 6 days	6 years 3 months 18 days
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.50%		2.50%		3.60%
Weighted average life			5 years 7 months 6 days	5 years
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.40%		3.40%		4.30%
Weighted average life			3 years 3 months 18 days	3 years 2 months 12 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.70%		2.10%
Private equity investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			7 years
Private equity investments | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Private equity investments | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 191,838,000		$ 191,838,000
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	24,600,000		$ 24,600,000
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 | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Senior secured bank loan funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	24,567,000		$ 24,567,000
Hedge funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 12,028,000		$ 12,028,000

Fair Value Measurements (Quanti

Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details) $ in Thousands	Sep. 30, 2019USD ($)$ / shares	Dec. 31, 2018USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	$ 962,109	$ 784,933
Other liabilities	(31,601)	(13,327)
Total other assets and (liabilities)	37,820	4,968
Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	962,109	784,933
Total other assets and (liabilities)	24,784	4,040
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	16,868,699	11,774,615
Fair Value, Measurements, Recurring | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	74,210	54,545
Other liabilities		(8,359)
Total other assets and (liabilities)	6,219
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	80,429	46,186
Fair Value, Measurements, Recurring | Private equity investments
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	266,048	242,647
Fair Value, Measurements, Recurring | Private equity investments | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	74,210	54,545
Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	10,455
Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	63,755
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities		(8,359)
Total other assets and (liabilities)	6,219
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities		$ (8,359)
Total other assets and (liabilities)	6,219
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Total other assets and (liabilities)	484
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(9,242)
Total other assets and (liabilities)	500
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Total other assets and (liabilities)	$ 14,977
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	0
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	105.12
Indicative pricing | Fair Value, Measurements, Recurring | Private equity investments | External valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	104.55
Liquidity discount | Fair Value, Measurements, Recurring | Private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	0.125
Liquidity discount | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.013
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	100.32
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | High
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	106.08
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	103.49
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	(11,028,000)
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.349
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0
Discount rate | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.016

Fair Value Measurements (Asse_2

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total realized and unrealized gains (losses)
Amounts acquired			$ 19,970
Other assets and (liabilities)
Total realized and unrealized gains (losses)
Settlements		$ (983)
Amounts acquired			19,970
Fair Value (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 82,752		46,186
Total realized and unrealized gains (losses)
Purchases	(535)		13,509
Settlements			20
Balance at end of the period	80,429		80,429
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other income (loss)
Total realized and unrealized gains (losses)
Included in other income	(1,780)		760
Total foreign exchange losses	(8)		(16)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	74,810		54,545
Total realized and unrealized gains (losses)
Purchases	0		17,891
Settlements			0
Amounts acquired			0
Balance at end of the period	74,210		74,210
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other investments | Other income (loss)
Total realized and unrealized gains (losses)
Included in other income	(592)		1,790
Total foreign exchange losses	(8)		(16)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	7,942	(2,018)	(8,359)	$ (2,952)
Total realized and unrealized gains (losses)
Purchases	(535)	(9,668)	(4,382)	(9,379)
Settlements			20	983
Balance at end of the period	6,219	(8,949)	6,219	(8,949)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Other assets and (liabilities) | Other income (loss)
Total realized and unrealized gains (losses)
Included in other income	(1,188)	$ 1,754	(1,030)	$ 2,399
Total foreign exchange 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, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Other investments	$ 962,109	$ 784,933
Other assets	37,820	4,968
Other liabilities	$ 31,601	$ 13,327

Fair Value Measurements (Compan

Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) $ in Thousands	Sep. 30, 2019USD ($)
Senior secured bank loan funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 24,600
Fair Value Measured at Net Asset Value Per Share
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	228,433
Unfunded Commitments	366,870
Fair Value Measured at Net Asset Value Per Share | Private equity investments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	191,838
Unfunded Commitments	359,470
Fair Value Measured at Net Asset Value Per Share | Senior secured bank loan funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	24,567
Unfunded Commitments	7,400
Fair Value Measured at Net Asset Value Per Share | Hedge funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	12,028
Unfunded Commitments	$ 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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Premiums written
Direct	$ 108,478	$ 74,635	$ 318,984	$ 250,375
Assumed	752,590	551,042	3,583,287	2,512,297
Ceded	(156,938)	(172,422)	(1,246,145)	(1,041,864)
Net premiums written	704,130	453,255	2,656,126	1,720,808
Premiums earned
Direct	103,446	73,356	283,898	213,292
Assumed	1,146,831	760,920	3,114,408	1,968,138
Ceded	(343,529)	(302,427)	(1,030,028)	(779,914)
Net premiums earned	906,748	531,849	2,368,278	1,401,516
Claims and claim expenses
Gross claims and claim expenses incurred	714,714	514,873	1,804,889	817,560
Claims and claim expenses recovered	(60,194)	(104,363)	(469,961)	(175,180)
Net claims and claim expenses incurred	$ 654,520	$ 410,510	$ 1,334,928	$ 642,380

Reinsurance (Narrative) (Detail

Reinsurance (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Ceded Credit Risk [Line Items]
Reinsurance recoverable	$ 2,438,299	$ 1,204,059	$ 2,372,221
Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Valuation allowances and reserves balance	$ 7,100		$ 9,000
Customer Concentration Risk, Customer One | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	14.60%	15.50%
Customer Concentration Risk, Customer One | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	17.40%	16.20%
Customer Concentration Risk, Customer Two | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	8.20%	6.70%
Customer Concentration Risk, Customer Two | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	7.40%	14.80%
Customer Concentration Risk, Customer Three | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	8.00%	6.50%
Customer Concentration Risk, Customer Three | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	7.00%	12.30%
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	59.50%	60.80%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating
Ceded Credit Risk [Line Items]
Concentration risk, percentage	38.90%	38.00%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating
Ceded Credit Risk [Line Items]
Concentration risk, percentage	1.60%	1.20%

Reserve for Claims and Claim _3

Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 2,648,458	$ 1,463,713
Additional Case Reserves	1,645,155	1,425,184
IBNR	4,308,824	3,187,374
Gross reserve for claims and claim expenses	8,602,437	6,076,271	$ 4,952,498
Other
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	2,944	1,458
Additional Case Reserves	0	0
IBNR	3,166	3,166
Gross reserve for claims and claim expenses	6,110	4,624
Property | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,170,009	690,718
Additional Case Reserves	1,493,600	1,308,307
IBNR	916,314	1,087,229
Gross reserve for claims and claim expenses	3,579,923	3,086,254
Casualty and Specialty | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,475,505	771,537
Additional Case Reserves	151,555	116,877
IBNR	3,389,344	2,096,979
Gross reserve for claims and claim expenses	$ 5,016,404	$ 2,985,393

Reserve for Claims and Claim _4

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net reserves as of beginning of period			$ 3,704,050	$ 3,493,778
Net incurred related to:
Current year	$ 664,967	$ 419,926	1,349,448	839,360
Prior years	(10,447)	(9,416)	(14,520)	(196,980)
Total net incurred	654,520	410,510	1,334,928	642,380
Net paid related to:
Current year			128,471	48,075
Prior years			563,539	326,692
Total net paid			692,010	374,767
Amounts acquired			1,858,775	0
Foreign exchange			(41,605)	(12,952)
Net reserves as of end of period	6,164,138	3,748,439	3,704,050	3,493,778
Reinsurance recoverable as of end of period	2,438,299	1,204,059	2,438,299	1,204,059
Gross reserves as of end of period	$ 8,602,437	$ 4,952,498	$ 8,602,437	$ 4,952,498

Reserve for Claims and Claim _5

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
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (10,447)	$ (9,416)	$ (14,520)	$ (196,980)
Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	161	(18)	178	(88)
Property
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			5,020	(172,872)
Property | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			9,245	(5,682)
Property | Large and Small Catastrophe Events and Attritional Loss Movements
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,225)	(167,190)
Property | Large catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(5,391)	(158,468)
Property | 2017 Large Loss Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(90,817)	(151,155)
Property | New Zealand Earthquake (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(7,497)
Property | Tohoku Earthquake and Tsunami (2011)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(4,693)
Property | New Zealand Earthquake (2010)
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			46,741
Property | 2018 Large Loss Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			61,592
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(10,717)	(7,313)
Property | Small catastrophe events and attritional loss movements
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			1,166	(8,722)
Property | Other small catastrophe events and attritional loss movements
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			1,166	(8,722)
Property | Operating Segments
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(7,620)	(2,165)	5,020	(172,872)
Casualty and Specialty
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(19,718)	(24,020)
Casualty and Specialty | Actuarial assumption changes
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			34,809	(7,786)
Casualty and Specialty | Actuarial methods
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years			(54,527)	(16,234)
Casualty and Specialty | Operating Segments
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (2,988)	$ (7,233)	$ (19,718)	$ (24,020)

Debt and Credit Facilities (Sum

Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 02, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Fair Value	$ 1,460,184		$ 974,714
Carrying Value	$ 1,383,498		991,127
3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Stated interest rate	3.60%
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Stated interest rate	3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Stated interest rate	3.70%
5.750% Senior Notes due 2020
Debt Instrument [Line Items]
Stated interest rate	5.75%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Stated interest rate	4.75%
Senior Notes | 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Stated interest rate		3.60%
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	$ 419,000		0
Carrying Value	391,245		0
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	309,480		283,680
Carrying Value	296,167		295,797
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	315,837		292,557
Carrying Value	297,964		297,688
Senior Notes | 5.750% Senior Notes due 2020 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	259,600		255,938
Carrying Value	249,850		249,602
Senior Notes | 4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Fair Value	156,267		142,539
Carrying Value	$ 148,272		$ 148,040

Debt and Credit Facilities (Deb

Debt and Credit Facilities (Debt Obligations) (Details) - 3.600% Senior Notes due 2029 - USD ($)	Apr. 02, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Stated interest rate		3.60%
Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.60%
Face amount	$ 400,000,000
Repayments of lines of credit	$ 200,000,000

Debt and Credit Facilities (Sch

Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Sep. 30, 2019 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 1,067,177	£ 0
Specialty Risks FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding | £		£ 0
RenaissanceRe Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	0
Letter of Credit | Renaissance Reinsurance FAL Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	255,000
Letter of Credit | Wells Fargo | Uncommitted Standby Letter of Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	31,820
Letter of Credit | Citibank Europe PLC
Line of Credit Facility [Line Items]
Credit facilities outstanding	218,684
Letter of Credit | Citibank Europe PLC | Bilateral Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	234,606
Letter of Credit | Mizuho Bank, Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	139,379
Letter of Credit | The Bank of Tokyo-Mitsubishi UFJ Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	77,637
Letter of Credit | Credit Suisse (Switzerland) Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 110,051

Debt and Credit Facilities (Cre

Debt and Credit Facilities (Credit Facilities) (Details) - Letter of Credit	Jun. 21, 2019USD ($)	Mar. 22, 2019USD ($)	Mar. 07, 2019USD ($)	Nov. 23, 2015USD ($)
Credit Suisse (Switzerland) Ltd.
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 125,000,000
Ratio of indebtedness to net capital		0.35
Minimum net worth required for compliance		$ 3,000,000,000
Wells Fargo
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000
Bank Of Montreal, CEP and ING Bank N.V., London Branch
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 255,000,000	$ 180,000,000

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) - USD ($) $ in Thousands	Jun. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 2,779,033	$ 2,051,700		$ 2,779,033
Net income attributable to redeemable noncontrolling interests		$ 62,057		$ 6,440	$ 204,091	$ 90,822
DaVinci Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	21.90%	21.90%	22.10%		21.90%
Sale of equity interest	$ 11,600
RenaissanceRe Medici Fund Ltd.
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest		13.70%	15.80%		13.70%
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 1,462,677	$ 1,034,946	1,085,985	$ 1,462,677	1,085,985	$ 1,431,101	$ 1,082,425	$ 1,011,659
Net income attributable to redeemable noncontrolling interests		30,558		3,730	152,946	74,935
Sale of shares to redeemable noncontrolling interest	349,200	0		0	274,699	0
Redemption of shares from redeemable noncontrolling interest		$ (1,018)		170	$ (86)	609
DaVinciRe Holdings Ltd. | Maximum
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		$ 534,618	416,765	447,993	$ 534,618	447,993	515,915	411,003	284,847
Net income attributable to redeemable noncontrolling interests		15,211		2,710	19,396	15,887
Sale of shares to redeemable noncontrolling interest		10,500		43,000	$ 142,905	199,482
Redemption provision, notice period					30 days
Redemption of shares from redeemable noncontrolling interest		7,008		8,720	$ 44,448	52,223
Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		781,738	599,989	0	781,738	0	$ 765,450	$ 0	$ 0
Net income attributable to redeemable noncontrolling interests		16,288		0	31,749	0
Sale of shares to redeemable noncontrolling interest		$ 0		$ 0	150,000	$ 0
Participating, Non-voting Common Shares | Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interest			600,000		$ 150,000
Voting, Non-participating Shares | Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interest			$ 1
Third-Party Investors | DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interest	263,100
RenaissanceRe Holdings Ltd. | DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interest	$ 86,100

Noncontrolling Interests (Sched

Noncontrolling Interests (Schedule of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	Jun. 01, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Activity in redeemable noncontrolling interest
Beginning balance					$ 2,051,700
Net income attributable to redeemable noncontrolling interest		$ 62,057		$ 6,440	204,091	$ 90,822
Ending balance		2,779,033	$ 2,051,700		2,779,033
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance		1,431,101	1,085,985	1,082,425	1,034,946	1,011,659
Redemption of shares from redeemable noncontrolling interest, net of adjustments		1,018		(170)	86	(609)
Sale of shares to redeemable noncontrolling interests	$ 349,200	0		0	274,699	0
Net income attributable to redeemable noncontrolling interest		30,558		3,730	152,946	74,935
Ending balance		1,462,677	1,034,946	1,085,985	1,462,677	1,085,985
RenaissanceRe Medici Fund Ltd.
Activity in redeemable noncontrolling interest
Beginning balance		515,915	447,993	411,003	416,765	284,847
Redemption of shares from redeemable noncontrolling interest, net of adjustments		(7,008)		(8,720)	(44,448)	(52,223)
Sale of shares to redeemable noncontrolling interests		10,500		43,000	142,905	199,482
Net income attributable to redeemable noncontrolling interest		15,211		2,710	19,396	15,887
Ending balance		534,618	416,765	447,993	534,618	447,993
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance		765,450	0	0	599,989	0
Sale of shares to redeemable noncontrolling interests		0		0	150,000	0
Net income attributable to redeemable noncontrolling interest		16,288		0	31,749	0
Ending balance		$ 781,738	$ 599,989	$ 0	$ 781,738	$ 0

Variable Interest Entities (Det

Variable Interest Entities (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets	$ 25,644,210,000		$ 25,644,210,000		$ 18,676,196,000
Liabilities	16,913,942,000		16,913,942,000		11,579,416,000
Redeemable noncontrolling interests	2,779,033,000		2,779,033,000		2,051,700,000
Ceded premiums written	156,938,000	$ 172,422,000	1,246,145,000	$ 1,041,864,000
Ceded premiums earned	343,529,000	302,427,000	1,030,028,000	779,914,000
Investments in other ventures, under equity method	103,978,000		103,978,000		115,172,000
Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written			87,000	9,100,000
Ceded premiums earned			87,000	6,800,000
Ceded net claims and claim expenses			7,500,000	0
Net reinsurance recoverable	7,500,000		7,500,000		0
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	2,800,000,000		2,800,000,000		2,200,000,000
Liabilities	2,800,000,000		2,800,000,000		2,200,000,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries			100,000,000		109,800,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor
Variable Interest Entity [Line Items]
Return of capital from subsidiaries			97,100,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries			$ 604,800,000		$ 856,700,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage			16.70%		14.00%
Vermeer Reinsurance Ltd.
Variable Interest Entity [Line Items]
Redeemable noncontrolling interests	781,738,000	$ 0	$ 781,738,000	$ 0	$ 599,989,000	$ 765,450,000	$ 0	$ 0
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	820,400,000		820,400,000		600,400,000
Liabilities	38,700,000		38,700,000		400,000
Redeemable noncontrolling interests	781,700,000		781,700,000		600,000,000
Fibonacci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary | Other investments
Variable Interest Entity [Line Items]
Investment in participating notes	1,000,000		1,000,000		6,000,000
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	1,700,000		1,700,000		1,300,000
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	$ 100,000		$ 100,000		$ 100,000

Shareholders' Equity (Details)

Shareholders' Equity (Details) - USD ($)	Sep. 30, 2019	Sep. 13, 2019	Jun. 28, 2019	Jun. 14, 2019	Mar. 29, 2019	Mar. 22, 2019	Mar. 15, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 10, 2017
Class of Stock [Line Items]
Dividends per common share (in dollars per share)		$ 0.34		$ 0.34				$ 0.34	$ 0.33	$ 1.02	$ 0.99
Dividends paid per common share (in dollars per share)	$ 0.34		$ 0.34		$ 0.34
Dividends declared and paid, preference shares								$ 9,189,000	$ 9,708,000	$ 27,567,000	$ 20,899,000
Dividends declared and paid, common shares										$ 44,500,000	$ 39,600,000
Common Shares
Class of Stock [Line Items]
Dividends per common share (in dollars per share)							$ 0.34
Share repurchase program, authorized amount												$ 500,000,000
Share repurchase program, shares repurchased (in shares)										0
Share repurchase program, remaining authorized aggregate amount	$ 500,000,000							$ 500,000,000		$ 500,000,000
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		$ 1.52
Liquidation preference quarterly (in dollars per share)	0.38							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		$ 1.34375
Liquidation preference quarterly (in dollars per share)	0.3359375							0.3359375		$ 0.3359375
Series F Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage										5.75%
Liquidation preference per annum (in dollars per share)	1,437.50							1,437.50		$ 1,437.50
Liquidation preference quarterly (in dollars per share)	359.375							359.375		359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375							1.4375		1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375							$ 0.359375		$ 0.359375
TMR Group Entities
Class of Stock [Line Items]
Common shares issued by RenaissanceRe to Tokio (in shares)						1,739,071

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income available to RenaissanceRe common shareholders	$ 36,698	$ 32,681	$ 678,269	$ 281,182
Amount allocated to participating common shareholders	(446)	(294)	(8,074)	(2,977)
Net income allocated to RenaissanceRe common shareholders	$ 36,252	$ 32,387	$ 670,195	$ 278,205
Denominator:
Denominator for basic income per RenaissanceRe common share - weighted average common shares (in shares)	43,462	39,624	43,003	39,606
Per common share equivalents of employee stock options and restricted shares (in shares)	75	13	46	21
Denominator for diluted income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions (in shares)	43,537	39,637	43,049	39,627
Net income available to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ 0.83	$ 0.82	$ 15.58	$ 7.02
Net income available to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ 0.83	$ 0.82	$ 15.57	$ 7.02

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Gross premiums written	$ 861,068	$ 625,677	$ 3,902,271	$ 2,762,672
Net premiums written	704,130	453,255	2,656,126	1,720,808
Net premiums earned	906,748	531,849	2,368,278	1,401,516
Net claims and claim expenses incurred	654,520	410,510	1,334,928	642,380
Acquisition expenses	202,181	109,761	553,614	312,524
Operational expenses	53,415	40,593	158,162	119,408
Underwriting income (loss)	(3,368)	(29,015)	321,574	327,204
Net investment income	113,844	80,696	311,138	208,528
Net foreign exchange losses	(8,275)	(4,566)	(1,812)	(11,496)
Equity in earnings of other ventures	5,877	7,648	17,350	14,331
Other income	1,016	497	5,109	480
Net realized and unrealized gains (losses) on investments	31,938	13,630	396,586	(86,415)
Corporate expenses	(13,844)	(6,841)	(76,480)	(21,875)
Interest expense	(15,580)	(11,769)	(42,868)	(35,304)
Income before taxes	111,608	50,280	930,597	395,453
Income tax expense	(3,664)	(1,451)	(20,670)	(2,550)
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Dividends on preference shares	(9,189)	(9,708)	(27,567)	(20,899)
Net income available to RenaissanceRe common shareholders	36,698	32,681	678,269	281,182
Net claims and claim expenses incurred – current accident year	664,967	419,926	1,349,448	839,360
Net claims and claim expenses incurred – prior accident years	(10,447)	(9,416)	(14,520)	(196,980)
Total net incurred	$ 654,520	$ 410,510	$ 1,334,928	$ 642,380
Net claims and claim expense ratio – current accident year	73.30%	79.00%	57.00%	59.90%
Net claims and claim expense ratio – prior accident years	(1.10%)	(1.80%)	(0.60%)	(14.10%)
Net claims and claim expense ratio – calendar year	72.20%	77.20%	56.40%	45.80%
Underwriting expense ratio	28.20%	28.30%	30.00%	30.90%
Combined ratio	100.40%	105.50%	86.40%	76.70%
Other
Segment Reporting Information [Line Items]
Gross premiums written	$ 0	$ 0	$ 0	$ 0
Net premiums written	0	0	0	0
Net premiums earned	0	(1)	0	(1)
Net claims and claim expenses incurred	161	(18)	178	(88)
Acquisition expenses	6	(1)	(186)	0
Operational expenses	(21)	40	13	354
Underwriting income (loss)	(146)	(22)	(5)	(267)
Net investment income	113,844	80,696	311,138	208,528
Net foreign exchange losses	(8,275)	(4,566)	(1,812)	(11,496)
Equity in earnings of other ventures	5,877	7,648	17,350	14,331
Other income	1,016	497	5,109	480
Net realized and unrealized gains (losses) on investments	31,938	13,630	396,586	(86,415)
Corporate expenses	(13,844)	(6,841)	(76,480)	(21,875)
Interest expense	(15,580)	(11,769)	(42,868)	(35,304)
Income tax expense	(3,664)	(1,451)	(20,670)	(2,550)
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Dividends on preference shares	(9,189)	(9,708)	(27,567)	(20,899)
Net claims and claim expenses incurred – current accident year	0	0	0	0
Net claims and claim expenses incurred – prior accident years	161	(18)	178	(88)
Total net incurred	161	(18)	178	(88)
Property
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			5,020	(172,872)
Property | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	314,400	301,413	2,185,984	1,561,008
Net premiums written	302,982	232,632	1,411,327	884,541
Net premiums earned	444,332	293,059	1,160,090	722,246
Net claims and claim expenses incurred	338,260	265,857	541,217	222,195
Acquisition expenses	79,521	45,524	222,971	127,095
Operational expenses	34,238	25,577	99,546	75,933
Underwriting income (loss)	(7,687)	(43,899)	296,356	297,023
Net claims and claim expenses incurred – current accident year	345,880	268,022	536,197	395,067
Net claims and claim expenses incurred – prior accident years	(7,620)	(2,165)	5,020	(172,872)
Total net incurred	$ 338,260	$ 265,857	$ 541,217	$ 222,195
Net claims and claim expense ratio – current accident year	77.80%	91.50%	46.20%	54.70%
Net claims and claim expense ratio – prior accident years	(1.70%)	(0.80%)	0.50%	(23.90%)
Net claims and claim expense ratio – calendar year	76.10%	90.70%	46.70%	30.80%
Underwriting expense ratio	25.60%	24.30%	27.80%	28.10%
Combined ratio	101.70%	115.00%	74.50%	58.90%
Casualty and Specialty
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years			$ (19,718)	$ (24,020)
Casualty and Specialty | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	$ 546,668	$ 324,264	1,716,287	1,201,664
Net premiums written	401,148	220,623	1,244,799	836,267
Net premiums earned	462,416	238,791	1,208,188	679,271
Net claims and claim expenses incurred	316,099	144,671	793,533	420,273
Acquisition expenses	122,654	64,238	330,829	185,429
Operational expenses	19,198	14,976	58,603	43,121
Underwriting income (loss)	4,465	14,906	25,223	30,448
Net claims and claim expenses incurred – current accident year	319,087	151,904	813,251	444,293
Net claims and claim expenses incurred – prior accident years	(2,988)	(7,233)	(19,718)	(24,020)
Total net incurred	$ 316,099	$ 144,671	$ 793,533	$ 420,273
Net claims and claim expense ratio – current accident year	69.00%	63.60%	67.30%	65.40%
Net claims and claim expense ratio – prior accident years	(0.60%)	(3.00%)	(1.60%)	(3.50%)
Net claims and claim expense ratio – calendar year	68.40%	60.60%	65.70%	61.90%
Underwriting expense ratio	30.60%	33.20%	32.20%	33.60%
Combined ratio	99.00%	93.80%	97.90%	95.50%

Derivative Instruments (Consoli

Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative Assets
Gross Amounts of Recognized Assets	$ 26,120
Gross Amounts Offset in the Balance Sheet	513
Net Amounts of Assets Presented in the Balance Sheet	25,607
Collateral	0
Net Amount	25,607
Derivative Liabilities
Gross Amounts of Recognized Liabilities	8,468
Gross Amounts Offset in the Balance Sheet	1,426
Net Amounts of Liabilities Presented in the Balance Sheet	7,042
Collateral Pledged	389
Net Amount	6,653
Other assets
Derivative Assets
Gross Amounts of Recognized Assets		$ 22,874
Gross Amounts Offset in the Balance Sheet		3,944
Net Amounts of Assets Presented in the Balance Sheet		18,930
Collateral		0
Net Amount		18,930
Other liabilities
Derivative Liabilities
Gross Amounts of Recognized Liabilities		8,225
Gross Amounts Offset in the Balance Sheet		1,684
Net Amounts of Liabilities Presented in the Balance Sheet		6,540
Collateral Pledged		2,132
Net Amount		4,408
Not Designated as Hedging Instrument | Other assets
Derivative Assets
Gross Amounts of Recognized Assets	25,048
Gross Amounts Offset in the Balance Sheet	513
Net Amounts of Assets Presented in the Balance Sheet	24,535
Collateral	0
Net Amount	24,535
Not Designated as Hedging Instrument | Other assets | Interest rate futures
Derivative Assets
Gross Amounts of Recognized Assets	175	971
Gross Amounts Offset in the Balance Sheet	145	636
Net Amounts of Assets Presented in the Balance Sheet	30	335
Collateral	0	0
Net Amount	30	335
Not Designated as Hedging Instrument | Other assets | Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	5	860
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	5	860
Collateral	0	0
Net Amount	5	860
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations
Derivative Assets
Gross Amounts of Recognized Assets	21,822	16,459
Gross Amounts Offset in the Balance Sheet	0	2,260
Net Amounts of Assets Presented in the Balance Sheet	21,822	14,199
Collateral	0	0
Net Amount	21,822	14,199
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations
Derivative Assets
Gross Amounts of Recognized Assets	1,105	3,194
Gross Amounts Offset in the Balance Sheet	368	71
Net Amounts of Assets Presented in the Balance Sheet	737	3,123
Collateral	0	0
Net Amount	737	3,123
Not Designated as Hedging Instrument | Other assets | Credit default swaps
Derivative Assets
Gross Amounts of Recognized Assets	209
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	209
Collateral	0
Net Amount	209
Not Designated as Hedging Instrument | Other assets | Total return swaps
Derivative Assets
Gross Amounts of Recognized Assets	1,177
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	1,177
Collateral	0
Net Amount	1,177
Not Designated as Hedging Instrument | Other assets | Equity futures
Derivative Assets
Gross Amounts of Recognized Assets	555	1,390
Gross Amounts Offset in the Balance Sheet	0	977
Net Amounts of Assets Presented in the Balance Sheet	555	413
Collateral	0	0
Net Amount	555	413
Not Designated as Hedging Instrument | Other liabilities
Derivative Liabilities
Gross Amounts of Recognized Liabilities	8,468
Gross Amounts Offset in the Balance Sheet	1,010
Net Amounts of Liabilities Presented in the Balance Sheet	7,458
Collateral Pledged	389
Net Amount	7,069
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures
Derivative Liabilities
Gross Amounts of Recognized Liabilities	518	910
Gross Amounts Offset in the Balance Sheet	145	636
Net Amounts of Liabilities Presented in the Balance Sheet	373	273
Collateral Pledged	373	273
Net Amount	0	0
Not Designated as Hedging Instrument | Other liabilities | Interest rate swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	16	506
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	16	506
Collateral Pledged	16	254
Net Amount	0	252
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	6,676	4,154
Gross Amounts Offset in the Balance Sheet	497	0
Net Amounts of Liabilities Presented in the Balance Sheet	6,179	4,154
Collateral Pledged	0	0
Net Amount	6,179	4,154
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	1,078	72
Gross Amounts Offset in the Balance Sheet	368	71
Net Amounts of Liabilities Presented in the Balance Sheet	710	1
Collateral Pledged	0	0
Net Amount	710	1
Not Designated as Hedging Instrument | Other liabilities | Credit default swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities		1,606
Gross Amounts Offset in the Balance Sheet		0
Net Amounts of Liabilities Presented in the Balance Sheet		1,606
Collateral Pledged		1,605
Net Amount		1
Not Designated as Hedging Instrument | Other liabilities | Total return swaps
Derivative Liabilities
Gross Amounts of Recognized Liabilities	180
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Liabilities Presented in the Balance Sheet	180
Collateral Pledged	0
Net Amount	180
Not Designated as Hedging Instrument | Other liabilities | Equity futures
Derivative Liabilities
Gross Amounts of Recognized Liabilities		977
Gross Amounts Offset in the Balance Sheet		977
Net Amounts of Liabilities Presented in the Balance Sheet		0
Collateral Pledged		0
Net Amount		$ 0
Designated as Hedging Instrument
Derivative Assets
Gross Amounts of Recognized Assets	1,072
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	1,072
Collateral	0
Net Amount	1,072
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations
Derivative Assets
Gross Amounts of Recognized Assets	1,072
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Assets Presented in the Balance Sheet	1,072
Collateral	0
Net Amount	1,072
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	0
Gross Amounts Offset in the Balance Sheet	416
Net Amounts of Liabilities Presented in the Balance Sheet	(416)
Collateral Pledged	0
Net Amount	$ (416)

Derivative Instruments (Gain (L

Derivative Instruments (Gain (Loss) Recognized in the Consolidated Statements of Operations Related to its Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 8,249		$ 4,541
Amount of gain (loss) recognized on derivatives	9,397	$ 617	51,755	$ (1,688)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	6,133	617	47,647	(1,688)
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Interest rate futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	7,199	2,731	35,136	292
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	887	(6)	2,071	129
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Credit default swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	65	(191)	5,521	(1,228)
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Total return swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	1,960	0	6,995	0
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Equity futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	1,023	29	12,380	44
Not Designated as Hedging Instrument | Net foreign exchange losses | Foreign currency forward contracts, underwriting and non-investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(5,912)	(2,596)	(13,086)	(2,227)
Not Designated as Hedging Instrument | Net foreign exchange losses | Foreign currency forward contracts, investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	911	650	(1,370)	1,302
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 3,264	$ 0	$ 4,108	$ 0

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Interest rate futures | Long
Derivative [Line Items]
Notional amount	$ 2,200,000,000	$ 1,900,000,000
Interest rate futures | Short
Derivative [Line Items]
Notional amount	456,900,000	545,800,000
Interest rate swaps | US Dollars | Paying a Fixed Rate
Derivative [Line Items]
Notional amount	25,900,000	78,400,000
Interest rate swaps | US Dollars | Receiving a Fixed Rate
Derivative [Line Items]
Notional amount	23,500,000	32,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Long
Derivative [Line Items]
Notional amount	536,100,000	354,100,000
Foreign currency forward contracts, underwriting and non-investment operations | Short
Derivative [Line Items]
Notional amount	1,000,000,000	601,200,000
Foreign currency forward contracts, investment operations | Long
Derivative [Line Items]
Notional amount	145,500,000	121,300,000
Foreign currency forward contracts, investment operations | Short
Derivative [Line Items]
Notional amount	42,900,000	42,900,000
Credit default swaps | Long
Derivative [Line Items]
Notional amount	500,000	1,000,000
Credit default swaps | Short
Derivative [Line Items]
Notional amount	146,400,000	126,200,000
Total return swaps | Long
Derivative [Line Items]
Notional amount	230,200,000
Total return swaps | Short
Derivative [Line Items]
Notional amount	0
Equity futures | Long
Derivative [Line Items]
Notional amount	112,400,000	44,700,000
Equity futures | Short
Derivative [Line Items]
Notional amount	$ 0	$ 0

Derivative Instruments (Derivat

Derivative Instruments (Derivative Instruments Designated as Hedges of a Net Investment in a Foreign Operation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Accumulated other comprehensive income (loss)	$ 8,249		$ 4,541
Foreign Exchange Forward | Designated as Hedging Instrument | Net Investment Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted average of U.S. dollar equivalent of foreign denominated net assets	79,538	$ 0	80,303	$ 0
Accumulated other comprehensive income (loss)	$ 3,264	$ 0	$ 4,108	$ 0

Commitments, Contingencies an_3

Commitments, Contingencies and Other Items Commitments, Contingencies and Other Items (Leases) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease, weighted average lease term	2 years 3 months 18 days		2 years 3 months 18 days
Operating lease, right-of-use asset	$ 20.8		$ 20.8
Operating lease, liability	20.9		20.9
Operating lease, expense	$ 3.4		$ 7.6
Lessee, operating lease, term of contract	20 years		20 years
Lessee, operating lease, renewal term	30 years		30 years
Other assets
Lessee, Lease, Description [Line Items]
Finance lease, right-of-use asset	$ 20		$ 20		$ 20.6
Other liabilities
Lessee, Lease, Description [Line Items]
Finance lease, liability	25.3		25.3		$ 25.6
Other Operating Income (Expense), Net
Lessee, Lease, Description [Line Items]
Finance lease, interest expense	0.6	$ 0.7	1.9	$ 2
Finance lease, right-of-use asset, amortization	$ 0.2	$ 0.2	$ 0.7	$ 0.7

Commitments, Contingencies an_4

Commitments, Contingencies and Other Items - Future Minimum Lease Payments Under Existing Operating and Finance Leases (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating leases
2019 (remaining)	$ 2,256
2020	6,625
2021	6,397
2022	5,681
2023	2,690
2024	1,301
After 2024	923
Future minimum lease payments under existing leases	25,873
Finance leases
2019 (remaining)	833
2020	3,336
2021	3,336
2022	3,336
2023	2,830
2024	2,661
After 2024	10,129
Future minimum lease payments under existing leases	$ 26,461

Condensed Consolidating Finan_3

Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets
Total investments	$ 16,947,893	$ 11,885,747
Cash and cash equivalents	871,251	1,107,922
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	2,799,954	1,537,188
Prepaid reinsurance premiums	972,047	616,185
Reinsurance recoverable	2,438,299	2,372,221	$ 1,204,059
Accrued investment income	73,509	51,311
Deferred acquisition costs	708,258	476,661
Receivable for investments sold	225,147	256,416
Other assets	344,593	135,127
Goodwill and other intangible assets	263,259	237,418
Total assets	25,644,210	18,676,196
Liabilities
Reserve for claims and claim expenses	8,602,437	6,076,271	4,952,498
Unearned premiums	2,967,535	1,716,021
Debt	1,383,498	991,127
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	2,910,601	1,902,056
Payable for investments purchased	654,685	380,332
Other liabilities	395,186	513,609
Total liabilities	16,913,942	11,579,416
Redeemable noncontrolling interests	2,779,033	2,051,700
Shareholders’ Equity
Total shareholders’ equity	5,951,235	5,045,080	$ 4,886,521
Total liabilities, noncontrolling interests and shareholders’ equity	25,644,210	18,676,196
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Assets
Total investments	117,077	77,842
Cash and cash equivalents	3,691	3,350
Investments in subsidiaries	50,786	58,458
Due from subsidiaries and affiliates	101,579	101,579
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	208	310
Deferred acquisition costs	0	0
Receivable for investments sold	1	23,885
Other assets	13,853	22,571
Goodwill and other intangible assets	0	0
Total assets	287,195	287,995
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	0	0
Amounts due to subsidiaries and affiliates	92	217
Reinsurance balances payable	0	0
Payable for investments purchased	10	24
Other liabilities	328	5,362
Total liabilities	430	5,603
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	286,765	282,392
Total liabilities, noncontrolling interests and shareholders’ equity	287,195	287,995
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Assets
Total investments	18,987	28,885
Cash and cash equivalents	3,324	9,604
Investments in subsidiaries	1,279,042	1,215,663
Due from subsidiaries and affiliates	0	0
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	9	127
Deferred acquisition costs	0	0
Receivable for investments sold	0	0
Other assets	295,885	313,636
Goodwill and other intangible assets	0	0
Total assets	1,597,247	1,567,915
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	843,981	843,086
Amounts due to subsidiaries and affiliates	101,827	102,243
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	9,381	13,918
Total liabilities	955,189	959,247
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	642,058	608,668
Total liabilities, noncontrolling interests and shareholders’ equity	1,597,247	1,567,915
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Assets
Total investments	138,084	313,360
Cash and cash equivalents	5,099	3,534
Investments in subsidiaries	5,579,191	4,414,475
Due from subsidiaries and affiliates	8,595	57,039
Premiums receivable	0	0
Prepaid reinsurance premiums	0	0
Reinsurance recoverable	0	0
Accrued investment income	39	1,046
Deferred acquisition costs	0	0
Receivable for investments sold	482	203
Other assets	795,636	458,842
Goodwill and other intangible assets	117,278	120,476
Total assets	6,644,404	5,368,975
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	691,245	300,000
Amounts due to subsidiaries and affiliates	2,803	6,453
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	(879)	17,442
Total liabilities	693,169	323,895
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	5,951,235	5,045,080
Total liabilities, noncontrolling interests and shareholders’ equity	6,644,404	5,368,975
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Assets
Total investments	16,673,745	11,465,660
Cash and cash equivalents	859,137	1,091,434
Investments in subsidiaries	0	0
Due from subsidiaries and affiliates	0	0
Premiums receivable	2,799,954	1,537,188
Prepaid reinsurance premiums	972,047	616,185
Reinsurance recoverable	2,438,299	2,372,221
Accrued investment income	73,253	49,828
Deferred acquisition costs	708,258	476,661
Receivable for investments sold	224,664	232,328
Other assets	(1,806,661)	(1,403,636)
Goodwill and other intangible assets	145,981	116,942
Total assets	23,088,677	16,554,811
Liabilities
Reserve for claims and claim expenses	8,602,437	6,076,271
Unearned premiums	2,967,535	1,716,021
Debt	148,272	148,041
Amounts due to subsidiaries and affiliates	0	0
Reinsurance balances payable	2,910,601	1,902,056
Payable for investments purchased	654,675	380,308
Other liabilities	375,211	482,422
Total liabilities	15,658,731	10,705,119
Redeemable noncontrolling interests	2,779,033	2,051,700
Shareholders’ Equity
Total shareholders’ equity	4,650,913	3,797,992
Total liabilities, noncontrolling interests and shareholders’ equity	23,088,677	16,554,811
Consolidating Adjustments
Assets
Total investments	0	0
Cash and cash equivalents	0	0
Investments in subsidiaries	(6,909,019)	(5,688,596)
Due from subsidiaries and affiliates	(110,174)	(158,618)
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	1,045,880	743,714
Goodwill and other intangible assets	0	0
Total assets	(5,973,313)	(5,103,500)
Liabilities
Reserve for claims and claim expenses	0	0
Unearned premiums	0	0
Debt	(300,000)	(300,000)
Amounts due to subsidiaries and affiliates	(104,722)	(108,913)
Reinsurance balances payable	0	0
Payable for investments purchased	0	0
Other liabilities	11,145	(5,535)
Total liabilities	(393,577)	(414,448)
Redeemable noncontrolling interests	0	0
Shareholders’ Equity
Total shareholders’ equity	(5,579,736)	(4,689,052)
Total liabilities, noncontrolling interests and shareholders’ equity	$ (5,973,313)	$ (5,103,500)

Condensed Consolidating Finan_4

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Net premiums earned	$ 906,748	$ 531,849	$ 2,368,278	$ 1,401,516
Net investment income	113,844	80,696	311,138	208,528
Net foreign exchange gains (losses)	(8,275)	(4,566)	(1,812)	(11,496)
Equity in earnings of other ventures	5,877	7,648	17,350	14,331
Other income	1,016	497	5,109	480
Net realized and unrealized (losses) gains on investments	31,938	13,630	396,586	(86,415)
Total revenues	1,051,148	629,754	3,096,649	1,526,944
Expenses
Net claims and claim expenses incurred	654,520	410,510	1,334,928	642,380
Acquisition expenses	202,181	109,761	553,614	312,524
Operational expenses	53,415	40,593	158,162	119,408
Corporate expenses	13,844	6,841	76,480	21,875
Interest expense	15,580	11,769	42,868	35,304
Total expenses	939,540	579,474	2,166,052	1,131,491
Income (loss) before equity in net income (loss) of subsidiaries and taxes	111,608	50,280	930,597	395,453
Equity in net income (loss) of subsidiaries	0	0	0	0
Income before taxes	111,608	50,280	930,597	395,453
Income tax benefit (expense)	(3,664)	(1,451)	(20,670)	(2,550)
Net income	107,944	48,829	909,927	392,903
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Net income attributable to RenaissanceRe	45,887	42,389	705,836	302,081
Dividends on preference shares	(9,189)	(9,708)	(27,567)	(20,899)
Net income available to RenaissanceRe common shareholders	36,698	32,681	678,269	281,182
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income	570	539	1,689	1,629
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	0	0	0	0
Other income	0	0	0	0
Net realized and unrealized (losses) gains on investments	1,147	4,479	15,369	4,906
Total revenues	1,717	5,018	17,058	6,535
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	11	29	38	60
Corporate expenses	0	0	0	0
Interest expense	0	0	0	0
Total expenses	11	29	38	60
Income (loss) before equity in net income (loss) of subsidiaries and taxes	1,706	4,989	17,020	6,475
Equity in net income (loss) of subsidiaries	1,456	2,735	4,001	4,285
Income before taxes	3,162	7,724	21,021	10,760
Income tax benefit (expense)	(319)	(1,026)	(3,472)	(1,273)
Net income	2,843	6,698	17,549	9,487
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	2,843	6,698	17,549	9,487
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	2,843	6,698	17,549	9,487
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Revenues
Net premiums earned	0	0	0	0
Net investment income	1,906	1,541	5,983	3,981
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	1,298	290	2,915	2,045
Other income	0	0	0	0
Net realized and unrealized (losses) gains on investments	20	(73)	231	(399)
Total revenues	3,224	1,758	9,129	5,627
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	9,018	7,493	29,958	26,737
Corporate expenses	7	0	16	7
Interest expense	9,257	9,257	27,763	27,763
Total expenses	18,282	16,750	57,737	54,507
Income (loss) before equity in net income (loss) of subsidiaries and taxes	(15,058)	(14,992)	(48,608)	(48,880)
Equity in net income (loss) of subsidiaries	14,365	11,666	76,552	29,005
Income before taxes	(693)	(3,326)	27,944	(19,875)
Income tax benefit (expense)	1,562	1,840	4,956	5,677
Net income	869	(1,486)	32,900	(14,198)
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	869	(1,486)	32,900	(14,198)
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	869	(1,486)	32,900	(14,198)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Revenues
Net premiums earned	0	0	0	0
Net investment income	10,263	6,542	29,216	18,504
Net foreign exchange gains (losses)	(14,786)	3	(20,846)	(1)
Equity in earnings of other ventures	0	0	0	0
Other income	1,234	0	1,234	0
Net realized and unrealized (losses) gains on investments	1,983	(176)	7,501	(821)
Total revenues	(1,306)	6,369	17,105	17,682
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	2,039	3,570	4,643	7,551
Corporate expenses	6,948	3,778	49,618	12,498
Interest expense	5,708	1,478	13,284	3,694
Total expenses	14,695	8,826	67,545	23,743
Income (loss) before equity in net income (loss) of subsidiaries and taxes	(16,001)	(2,457)	(50,440)	(6,061)
Equity in net income (loss) of subsidiaries	61,021	45,130	754,634	310,081
Income before taxes	45,020	42,673	704,194	304,020
Income tax benefit (expense)	867	(284)	1,642	(1,939)
Net income	45,887	42,389	705,836	302,081
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	45,887	42,389	705,836	302,081
Dividends on preference shares	(9,189)	(9,708)	(27,567)	(20,899)
Net income available to RenaissanceRe common shareholders	36,698	32,681	678,269	281,182
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Revenues
Net premiums earned	906,748	531,849	2,368,278	1,401,516
Net investment income	113,705	80,472	308,001	208,034
Net foreign exchange gains (losses)	6,511	(4,569)	19,034	(11,495)
Equity in earnings of other ventures	4,579	7,358	14,435	12,286
Other income	(218)	497	3,875	480
Net realized and unrealized (losses) gains on investments	28,788	9,400	373,485	(90,101)
Total revenues	1,060,113	625,007	3,087,108	1,520,720
Expenses
Net claims and claim expenses incurred	654,520	410,510	1,334,928	642,380
Acquisition expenses	202,181	109,761	553,614	312,524
Operational expenses	34,814	42,682	98,613	113,721
Corporate expenses	5,010	3,063	21,172	9,370
Interest expense	615	2,512	1,821	7,541
Total expenses	897,140	568,528	2,010,148	1,085,536
Income (loss) before equity in net income (loss) of subsidiaries and taxes	162,973	56,479	1,076,960	435,184
Equity in net income (loss) of subsidiaries	0	0	0	0
Income before taxes	162,973	56,479	1,076,960	435,184
Income tax benefit (expense)	(5,774)	(1,981)	(23,796)	(5,015)
Net income	157,199	54,498	1,053,164	430,169
Net income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Net income attributable to RenaissanceRe	95,142	48,058	849,073	339,347
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	95,142	48,058	849,073	339,347
Consolidating Adjustments
Revenues
Net premiums earned	0	0	0	0
Net investment income	(12,600)	(8,398)	(33,751)	(23,620)
Net foreign exchange gains (losses)	0	0	0	0
Equity in earnings of other ventures	0	0	0	0
Other income	0	0	0	0
Net realized and unrealized (losses) gains on investments	0	0	0	0
Total revenues	(12,600)	(8,398)	(33,751)	(23,620)
Expenses
Net claims and claim expenses incurred	0	0	0	0
Acquisition expenses	0	0	0	0
Operational expenses	7,533	(13,181)	24,910	(28,661)
Corporate expenses	1,879	0	5,674	0
Interest expense	0	(1,478)	0	(3,694)
Total expenses	9,412	(14,659)	30,584	(32,355)
Income (loss) before equity in net income (loss) of subsidiaries and taxes	(22,012)	6,261	(64,335)	8,735
Equity in net income (loss) of subsidiaries	(76,842)	(59,531)	(835,187)	(343,371)
Income before taxes	(98,854)	(53,270)	(899,522)	(334,636)
Income tax benefit (expense)	0	0	0	0
Net income	(98,854)	(53,270)	(899,522)	(334,636)
Net income attributable to redeemable noncontrolling interests	0	0	0	0
Net income attributable to RenaissanceRe	(98,854)	(53,270)	(899,522)	(334,636)
Dividends on preference shares	0	0	0	0
Net income available to RenaissanceRe common shareholders	$ (98,854)	$ (53,270)	$ (899,522)	$ (334,636)

Condensed Consolidating Finan_5

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income (loss)
Net income (loss)	$ 107,944	$ 48,829	$ 909,927	$ 392,903
Change in net unrealized gains on investments, net of tax	608	(382)	1,880	(1,707)
Foreign currency translation adjustments, net of tax	8,249		4,541
Comprehensive income	116,801	48,447	916,348	391,196
Net (income) loss attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to RenaissanceRe	54,744	42,007	712,257	300,374
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer)
Comprehensive income (loss)
Net income (loss)	2,843	6,698	17,549	9,487
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	2,843	6,698	17,549	9,487
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	2,843	6,698	17,549	9,487
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Comprehensive income (loss)
Net income (loss)	869	(1,486)	32,900	(14,198)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	869	(1,486)	32,900	(14,198)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	869	(1,486)	32,900	(14,198)
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Comprehensive income (loss)
Net income (loss)	45,887	42,389	705,836	302,081
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	45,887	42,389	705,836	302,081
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	45,887	42,389	705,836	302,081
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Comprehensive income (loss)
Net income (loss)	157,199	54,498	1,053,164	430,169
Change in net unrealized gains on investments, net of tax	608	(382)	1,880	(1,707)
Foreign currency translation adjustments, net of tax	8,249		4,541
Comprehensive income	166,056	54,116	1,059,585	428,462
Net (income) loss attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to redeemable noncontrolling interests	(62,057)	(6,440)	(204,091)	(90,822)
Comprehensive income attributable to RenaissanceRe	103,999	47,676	855,494	337,640
Consolidating Adjustments
Comprehensive income (loss)
Net income (loss)	(98,854)	(53,270)	(899,522)	(334,636)
Change in net unrealized gains on investments, net of tax	0	0	0	0
Foreign currency translation adjustments, net of tax	0		0
Comprehensive income	(98,854)	(53,270)	(899,522)	(334,636)
Net (income) loss attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to redeemable noncontrolling interests	0	0	0	0
Comprehensive income attributable to RenaissanceRe	$ (98,854)	$ (53,270)	$ (899,522)	$ (334,636)

Condensed Consolidating Finan_6

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, 2019	Sep. 30, 2018
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	$ 1,264,432	$ 888,526
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	12,835,916	8,221,481
Purchases of fixed maturity investments trading	(13,403,711)	(8,692,688)
Net purchases of equity investments trading	(6,937)	15,490
Net purchases of short term investments	(1,362,151)	(1,465,451)
Net purchases of other investments	(130,476)	(130,649)
Net purchases of investments in other ventures	(2,341)	(20,952)
Return of investment from investment in other ventures	11,250	8,464
Net purchase of other assets	(4,108)	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries	0	0
Due (from) to subsidiary	0	0
Net purchase of the TMR Group Entities	(276,206)	0
Net cash used in investing activities	(2,338,764)	(2,064,305)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(44,547)	(39,611)
Dividends paid – preference shares	(27,567)	(20,899)
Issuance of debt, net of expenses	396,411	0
Issuance of preference shares, net of expenses	0	242,371
Net third party redeemable noncontrolling interest share transactions	515,952	96,021
Taxes paid on withholding shares	(7,229)	(7,079)
Net cash provided by financing activities	833,020	270,803
Effect of exchange rate changes on foreign currency cash	4,641	(3,575)
Net decrease in cash and cash equivalents	(236,671)	(908,551)
Cash and cash equivalents, beginning of period	1,107,922	1,361,592
Cash and cash equivalents, end of period	871,251	453,041
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	1,316	1,496
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	51,669	91,118
Purchases of fixed maturity investments trading	(50,549)	(65,988)
Net purchases of equity investments trading	(2,476)	(624)
Net purchases of short term investments	506	360
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	0	0
Contributions to subsidiaries		(16,847)
Contributions to subsidiaries	0
Due (from) to subsidiary	(125)	(9,598)
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	(975)	(1,579)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	341	(83)
Cash and cash equivalents, beginning of period	3,350	139
Cash and cash equivalents, end of period	3,691	56
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(30,943)	16,194
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	43,746	45,459
Purchases of fixed maturity investments trading	(15,910)	(20,806)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	(16,257)	(9,206)
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	13,500	0
Contributions to subsidiaries		(65,000)
Contributions to subsidiaries	0
Due (from) to subsidiary	(416)	36,262
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	24,663	(13,291)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	0	0
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	(6,280)	2,903
Cash and cash equivalents, beginning of period	9,604	1,469
Cash and cash equivalents, end of period	3,324	4,372
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	(381,508)	(5,869)
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	277,030	384,818
Purchases of fixed maturity investments trading	(66,740)	(281,994)
Net purchases of equity investments trading	0	0
Net purchases of short term investments	(34,209)	85,598
Net purchases of other investments	0	0
Net purchases of investments in other ventures	0	0
Return of investment from investment in other ventures	0	0
Net purchase of other assets	0
Dividends and return of capital from subsidiaries	855,396	511,098
Contributions to subsidiaries	(1,013,916)	(686,106)
Due (from) to subsidiary	48,444	(193,249)
Net purchase of the TMR Group Entities	0
Net cash used in investing activities	66,005	(179,835)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	(44,547)	(39,611)
Dividends paid – preference shares	(27,567)	(20,899)
Issuance of debt, net of expenses	396,411
Issuance of preference shares, net of expenses		242,371
Net third party redeemable noncontrolling interest share transactions	0	0
Taxes paid on withholding shares	(7,229)	(7,079)
Net cash provided by financing activities	317,068	174,782
Effect of exchange rate changes on foreign currency cash	0	0
Net decrease in cash and cash equivalents	1,565	(10,922)
Cash and cash equivalents, beginning of period	3,534	14,656
Cash and cash equivalents, end of period	5,099	3,734
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries and Eliminations (Non-Guarantor Subsidiaries)
Cash flows (used in) provided by operating activities
Net cash (used in) provided by operating activities	1,675,567	876,705
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	12,463,471	7,700,086
Purchases of fixed maturity investments trading	(13,270,512)	(8,323,900)
Net purchases of equity investments trading	(4,461)	16,114
Net purchases of short term investments	(1,312,191)	(1,542,203)
Net purchases of other investments	(130,476)	(130,649)
Net purchases of investments in other ventures	(2,341)	(20,952)
Return of investment from investment in other ventures	11,250	8,464
Net purchase of other assets	(4,108)
Dividends and return of capital from subsidiaries	(868,896)	(511,098)
Contributions to subsidiaries	1,013,916	767,953
Due (from) to subsidiary	(47,903)	166,585
Net purchase of the TMR Group Entities	(276,206)
Net cash used in investing activities	(2,428,457)	(1,869,600)
Cash flows provided by financing activities
Dividends paid – RenaissanceRe common shares	0	0
Dividends paid – preference shares	0	0
Issuance of debt, net of expenses	0
Issuance of preference shares, net of expenses		0
Net third party redeemable noncontrolling interest share transactions	515,952	96,021
Taxes paid on withholding shares	0	0
Net cash provided by financing activities	515,952	96,021
Effect of exchange rate changes on foreign currency cash	4,641	(3,575)
Net decrease in cash and cash equivalents	(232,297)	(900,449)
Cash and cash equivalents, beginning of period	1,091,434	1,345,328
Cash and cash equivalents, end of period	$ 859,137	$ 444,879

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Dec. 31, 2019USD ($)
Typhoon Hagibis | Forecast
Subsequent Event [Line Items]
Loss contingency, estimate of possible loss	$ 175