10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

☒  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2021

OR

 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number: 001-14428

RENAISSANCERE HOLDINGS LTD.

(Exact Name Of Registrant As Specified In Its Charter)

Bermuda	98-0141974
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)

        Renaissance House, 12 Crow Lane, Pembroke, Bermuda         HM 19

            (Address of Principal Executive Offices)         (Zip Code)

(441) 295-4513

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol(s)	Name of each exchange on which registered
Common Shares, Par Value $1.00 per share	RNR	New York Stock Exchange
Series E 5.375% Preference Shares, Par Value $1.00 per share	RNR PRE	New York Stock Exchange
Depositary Shares, each representing a 1/1,000th interest in a Series F 5.750% Preference Share, Par Value $1.00 per share	RNR PRF	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒  No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒  No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒, Accelerated filer ☐, Non-accelerated filer ☐, Smaller reporting company ☐, Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  ☐ No ☒

The number of Common Shares, par value US $1.00 per share, outstanding at April 23, 2021 was 49,637,716.

RENAISSANCERE HOLDINGS LTD.

TABLE OF CONTENTS 

		Page
	NOTE ON FORWARD-LOOKING STATEMENTS	3
PART I
ITEM 1.	FINANCIAL STATEMENTS	6
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	51
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	78
ITEM 4.	CONTROLS AND PROCEDURES	78
PART II
ITEM 1.	LEGAL PROCEEDINGS	79
ITEM 1A.	RISK FACTORS	79
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	79
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	79
ITEM 4.	MINE SAFETY DISCLOSURES	79
ITEM 5.	OTHER INFORMATION	80
ITEM 6.	EXHIBITS	81
SIGNATURES - RENAISSANCERE HOLDINGS LTD.		82

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NOTE ON FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q (this “Form 10-Q”) of RenaissanceRe Holdings Ltd. (the “Company” or “RenaissanceRe”) contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward-looking statements are necessarily based on estimates and assumptions that are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which, with respect to future business decisions, are subject to change. These uncertainties and contingencies can affect actual results and could cause actual results to differ materially from those expressed in any forward-looking statements made by, or on behalf of, us. In particular, statements using words such as “may,” “should,” “estimate,” “expect,” “anticipate,” “intend,” “believe,” “predict,” “potential,” or words of similar import generally involve forward-looking statements. For example, we may include certain forward-looking statements in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” with regard to trends in results, prices, volumes, operations, investment results, margins, combined ratios, fees, reserves, market conditions, risk management and exchange rates. This Form 10-Q also contains forward-looking statements with respect to our business and industry, such as those relating to our strategy and management objectives, market standing and product volumes, competition and new entrants in our industry, industry capital, insured losses from loss events, government initiatives and regulatory matters affecting the reinsurance and insurance industries.

The inclusion of forward-looking statements in this report should not be considered as a representation by us or any other person that our current objectives or plans will be achieved. Numerous factors could cause our actual results to differ materially from those addressed by the forward-looking statements, including the following:

•the uncertainty of the continuing and future impact of the COVID-19 pandemic, including measures taken in response thereto and the effect of legislative, regulatory and judicial influences on our financial performance and our ability to conduct our business;

•the frequency and severity of catastrophic and other events we cover;

•the effectiveness of our claims and claim expense reserving process;

•the effect of climate change on our business, including the trend towards increasingly frequent and severe climate events;

•our ability to maintain our financial strength ratings;

•the effect of emerging claims and coverage issues;

•collection on claimed retrocessional coverage, and new retrocessional reinsurance being available on acceptable terms and providing the coverage that we intended to obtain;

•our reliance on a small and decreasing number of reinsurance brokers and other distribution services for the preponderance of our revenue;

•our exposure to credit loss from counterparties in the normal course of business;

•the effect of continued challenging economic conditions throughout the world;

•the performance of our investment portfolio and financial market volatility;

•a contention by the United States (the “U.S.”) Internal Revenue Service that Renaissance Reinsurance Ltd. (“Renaissance Reinsurance”), or any of our other Bermuda subsidiaries, is subject to taxation in the U.S.;

•the effects of U.S. tax reform legislation and possible future tax reform legislation and regulations, including changes to the tax treatment of our shareholders or investors in our joint ventures or other entities we manage;

•the effect of cybersecurity risks, including technology breaches or failure, on our business;

•the success of any of our strategic investments or acquisitions, including our ability to manage our operations as our product and geographical diversity increases;

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•our ability to retain our key senior officers and to attract or retain the executives and employees necessary to manage our business;

•our ability to effectively manage capital on behalf of investors in joint ventures or other entities we manage;

•foreign currency exchange rate fluctuations;

•soft reinsurance underwriting market conditions;

•changes in the method for determining the London Inter-bank Offered Rate (“LIBOR”) and the replacement of LIBOR;

•losses we could face from terrorism, political unrest or war;

•our ability to successfully implement our business strategies and initiatives;

•our ability to determine any impairments taken on our investments;

•the effects of inflation;

•the ability of our ceding companies and delegated authority counterparties to accurately assess the risks they underwrite;

•the effect of operational risks, including system or human failures;

•our ability to raise capital if necessary;

•our ability to comply with covenants in our debt agreements;

•changes to the regulatory systems under which we operate, including as a result of increased global regulation of the insurance and reinsurance industries;

•changes in Bermuda laws and regulations and the political environment in Bermuda;

•our dependence on the ability of our operating subsidiaries to declare and pay dividends;

•aspects of our corporate structure that may discourage third-party takeovers and other transactions;

•difficulties investors may have in serving process or enforcing judgments against us in the U.S.;

•the cyclical nature of the reinsurance and insurance industries;

•adverse legislative developments that reduce the size of the private markets we serve or impede their future growth;

•consolidation of competitors, customers and insurance and reinsurance brokers;

•the effect on our business of the highly competitive nature of our industry, including the effect of new entrants to, competing products for and consolidation in the (re)insurance industry;

•other political, regulatory or industry initiatives adversely impacting us;

•our ability to comply with applicable sanctions and foreign corrupt practices laws;

•increasing barriers to free trade and the free flow of capital;

•international restrictions on the writing of reinsurance by foreign companies and government intervention in the natural catastrophe market;

•the effect of Organisation for Economic Co-operation and Development or European Union (“EU”) measures to increase our taxes and reporting requirements;

•changes in regulatory regimes and accounting rules that may impact financial results irrespective of business operations;

•our need to make many estimates and judgments in the preparation of our financial statements; and

•the effect of the exit by the United Kingdom (the “U.K.”) from the EU.

As a consequence, our future financial condition and results may differ from those expressed in any forward-looking statements made by or on behalf of us. The factors listed above, which are discussed in more detail in our filings with the U.S. Securities and Exchange Commission (“SEC”), including our Annual Report on

4

Form 10-K (“Form 10-K”) for the year ended December 31, 2020, should not be construed as exhaustive. The effects of the events and circumstances described in the risk factors contained in this Form 10-Q may have the effect of heightening many of the risks contained in our Form 10-K. Forward-looking statements speak only as of the date they are made, and we undertake no obligation to revise or update forward-looking statements to reflect new information, events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

5

PART I        FINANCIAL INFORMATION

ITEM 1.        FINANCIAL STATEMENTS

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

	Page
Consolidated Balance Sheets at March 31, 2021 (unaudited) and December 31, 2020	7
Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020	8
Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2021 and 2020	9
Consolidated Statements of Changes in Shareholders’ Equity for the three months ended March 31, 2021 and 2020	10
Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020	11
Notes to the Consolidated Financial Statements	12
Note 1. Organization	12
Note 2. Significant Accounting Policies	13
Note 3. Investments	14
Note 4. Fair Value Measurements	17
Note 5. Reinsurance	27
Note 6. Reserve for Claims and Claim Expenses	28
Note 7. Debt and Credit Facilities	33
Note 8. Noncontrolling Interests	33
Note 9. Variable Interest Entities	36
Note 10. Shareholders’ Equity	39
Note 11. Earnings per Share	40
Note 12. Segment Reporting	41
Note 13. Derivative Instruments	43
Note 14. Commitments and Contingencies and Other Items	48
Note 15. Subsequent Events	50

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RenaissanceRe Holdings Ltd. and Subsidiaries

Consolidated Balance Sheets

(in thousands of United States Dollars, except share and per share amounts)

	March 31, 2021		December 31, 2020
Assets	(Unaudited)		(Audited)
Fixed maturity investments trading, at fair value – amortized cost $13,258,985 at March 31, 2021 (December 31, 2020 – $13,155,035)	$	13,309,234	$	13,506,503
Short term investments, at fair value	5,091,143		4,993,735
Equity investments trading, at fair value	503,137		702,617
Other investments, at fair value	1,379,056		1,256,948
Investments in other ventures, under equity method	91,362		98,373
Total investments	20,373,932		20,558,176
Cash and cash equivalents	1,286,661		1,736,813
Premiums receivable	3,928,122		2,894,631
Prepaid reinsurance premiums	1,229,716		823,582
Reinsurance recoverable	3,160,667		2,926,010
Accrued investment income	62,573		66,743
Deferred acquisition costs and value of business acquired	786,941		633,521
Receivable for investments sold	841,156		568,293
Other assets	318,249		363,170
Goodwill and other intangible assets	248,080		249,641
Total assets	$	32,236,097	$	30,820,580
Liabilities, Noncontrolling Interests and Shareholders’ Equity
Liabilities
Reserve for claims and claim expenses	$	10,953,383	$	10,381,138
Unearned premiums	3,833,155		2,763,599
Debt	1,136,783		1,136,265
Reinsurance balances payable	4,254,645		3,488,352
Payable for investments purchased	1,133,787		1,132,538
Other liabilities	436,437		970,121
Total liabilities	21,748,190		19,872,013
Commitments and Contingencies
Redeemable noncontrolling interests	3,409,570		3,388,319
Shareholders’ Equity
Preference shares: $1.00 par value – 11,010,000 shares issued and outstanding at March 31, 2021 (December 31, 2020 – 11,010,000)	525,000		525,000
Common shares: $1.00 par value – 49,969,717 shares issued and outstanding at March 31, 2021 (December 31, 2020 – 50,810,618)	49,970		50,811
Additional paid-in capital	1,450,627		1,623,206
Accumulated other comprehensive loss	(12,382)		(12,642)
Retained earnings	5,065,122		5,373,873
Total shareholders’ equity attributable to RenaissanceRe	7,078,337		7,560,248
Total liabilities, noncontrolling interests and shareholders’ equity	$	32,236,097	$	30,820,580

See accompanying notes to the consolidated financial statements

7

RenaissanceRe Holdings Ltd. and Subsidiaries

Consolidated Statements of Operations

For the three months ended March 31, 2021 and 2020

(in thousands of United States Dollars, except per share amounts) (Unaudited)

	Three months ended
	March 31, 2021		March 31, 2020
Revenues
Gross premiums written	$	2,652,442	$	2,025,721
Net premiums written	$	1,824,083	$	1,269,808
Increase in unearned premiums	(670,247)		(356,710)
Net premiums earned	1,153,836		913,098
Net investment income	79,804		99,473
Net foreign exchange losses	(22,788)		(5,728)
Equity in (losses) earnings of other ventures	(5,558)		4,564
Other income (loss)	2,171		(4,436)
Net realized and unrealized losses on investments	(345,563)		(110,707)
Total revenues	861,902		896,264
Expenses
Net claims and claim expenses incurred	867,051		570,954
Acquisition expenses	267,234		210,604
Operational expenses	55,311		67,461
Corporate expenses	10,405		15,991
Interest expense	11,912		14,927
Total expenses	1,211,913		879,937
(Loss) income before taxes	(350,011)		16,327
Income tax benefit	19,516		8,846
Net (loss) income	(330,495)		25,173
Net loss (income) attributable to redeemable noncontrolling interests	46,850		(98,091)
Net loss attributable to RenaissanceRe	(283,645)		(72,918)
Dividends on preference shares	(7,289)		(9,056)
Net loss attributable to RenaissanceRe common shareholders	$	(290,934)	$	(81,974)
Net loss attributable to RenaissanceRe common shareholders per common share – basic	$	(5.87)	$	(1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted	$	(5.87)	$	(1.89)
Dividends per common share	$	0.36	$	0.35

See accompanying notes to the consolidated financial statements

8

RenaissanceRe Holdings Ltd. and Subsidiaries

Consolidated Statements of Comprehensive Loss

For the three months ended March 31, 2021 and 2020

(in thousands of United States Dollars) (Unaudited) 

	Three months ended
	March 31, 2021		March 31, 2020
Comprehensive loss
Net (loss) income	$	(330,495)	$	25,173
Change in net unrealized losses on investments, net of tax	(1,811)		(657)
Foreign currency translation adjustments, net of tax	2,071		932
Comprehensive (loss) income	(330,235)		25,448
Net loss (income) attributable to redeemable noncontrolling interests	46,850		(98,091)
Comprehensive loss (income) attributable to redeemable noncontrolling interests	46,850		(98,091)
Comprehensive loss attributable to RenaissanceRe	$	(283,385)	$	(72,643)

See accompanying notes to the consolidated financial statements

9

RenaissanceRe Holdings Ltd. and Subsidiaries

Consolidated Statements of Changes in Shareholders’ Equity

For the three months ended March 31, 2021 and 2020

(in thousands of United States Dollars) (Unaudited) 

	Three months ended
	March 31, 2021		March 31, 2020
Preference shares
Beginning balance	$	525,000	$	650,000
Repurchase of shares	—		(125,000)
Ending balance	525,000		525,000
Common shares
Beginning balance	50,811		44,148
Repurchase of shares	(1,076)		(406)
Issuance of restricted stock awards	235		292
Ending balance	49,970		44,034
Additional paid-in capital
Beginning balance	1,623,206		568,277
Repurchase of shares	(170,569)		(62,215)
Change in redeemable noncontrolling interests	(1,865)		(349)
Issuance of restricted stock awards	(145)		(3,105)
Ending balance	1,450,627		502,608
Accumulated other comprehensive loss
Beginning balance	(12,642)		(1,939)
Change in net unrealized losses on investments, net of tax	(1,811)		(657)
Foreign currency translation adjustments, net of tax	2,071		932
Ending balance	(12,382)		(1,664)
Retained earnings
Beginning balance	5,373,873		4,710,881
Net (loss) income	(330,495)		25,173
Net loss (income) attributable to redeemable noncontrolling interests	46,850		(98,091)
Dividends on common shares	(17,817)		(15,359)
Dividends on preference shares	(7,289)		(9,056)
Ending balance	5,065,122		4,613,548
Total shareholders’ equity	$	7,078,337	$	5,683,526

See accompanying notes to the consolidated financial statements

10

RenaissanceRe Holdings Ltd. and Subsidiaries

Consolidated Statements of Cash Flows

For the three months ended March 31, 2021 and 2020

(in thousands of United States Dollars) (Unaudited)

	Three months ended
	March 31, 2021		March 31, 2020
Cash flows provided by operating activities
Net (loss) income	$	(330,495)	$	25,173
Adjustments to reconcile net income to net cash provided by operating activities
Amortization, accretion and depreciation	1,747		(4,405)
Equity in undistributed earnings of other ventures	17,891		7,398
Net realized and unrealized losses on investments	360,424		110,707
Change in:
Premiums receivable	(1,033,491)		(505,545)
Prepaid reinsurance premiums	(406,134)		(384,145)
Reinsurance recoverable	(234,657)		25,714
Deferred acquisition costs and value of business acquired	(153,420)		(75,884)
Reserve for claims and claim expenses	572,245		22,358
Unearned premiums	1,069,556		714,939
Reinsurance balances payable	766,293		944,684
Other	(423,421)		(405,528)
Net cash provided by operating activities	206,538		475,466
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	3,469,130		3,661,294
Purchases of fixed maturity investments trading	(3,808,597)		(3,370,394)
Net sales (purchases) of equity investments trading	128,020		(44,514)
Net purchases of short term investments	(111,085)		(704,226)
Net purchases of other investments	(127,661)		(79,711)
Net purchases of investments in other ventures	(15,542)		(1,888)
Return of investment from investment in other ventures	2,604		9,157
Net cash used in investing activities	(463,131)		(530,282)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(17,817)		(15,359)
Dividends paid – preference shares	(7,289)		(9,056)
RenaissanceRe common share repurchases	(171,645)		(62,621)
Repayment of debt	—		(250,000)
Redemption of 6.08% Series C preference shares	—		(125,000)
Net third-party redeemable noncontrolling interest share transactions	13,006		42,599
Taxes paid on withholding shares	(9,834)		(10,180)
Net cash used in financing activities	(193,579)		(429,617)
Effect of exchange rate changes on foreign currency cash	20		1,581
Net decrease in cash and cash equivalents	(450,152)		(482,852)
Cash and cash equivalents, beginning of period	1,736,813		1,379,068
Cash and cash equivalents, end of period	$	1,286,661	$	896,216

See accompanying notes to the consolidated financial statements

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RENAISSANCERE HOLDINGS LTD. AND SUBSIDIARIES

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2021

(unless otherwise noted, amounts in tables expressed in thousands of United States (“U.S.”) dollars,

except shares, per share amounts and percentages) (Unaudited)

NOTE 1. 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, 2020. RenaissanceRe was formed under the laws of Bermuda on June 7, 1993. Together with its wholly owned and majority-owned subsidiaries, joint ventures and managed funds, the Company provides property, casualty and specialty reinsurance and certain insurance solutions to its customers.

•Renaissance Reinsurance Ltd. (“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. 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 Syndicate 1458 (“Syndicate 1458”) is the Company’s Lloyd’s syndicate. RenaissanceRe Corporate Capital (UK) Limited, a wholly owned subsidiary of RenaissanceRe, is Syndicate 1458’s sole corporate member. RenaissanceRe Syndicate Management Ltd., a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458.

•RenaissanceRe Europe AG (“RREAG”), a Swiss-domiciled reinsurance company, which has branches in Australia, Bermuda, the U.K. and the U.S., provides property, casualty and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis.

•RenaissanceRe Specialty U.S. Ltd., a Bermuda-domiciled insurer, which operates subject to U.S. federal income tax.

•DaVinci Reinsurance Ltd. (“DaVinci”), a wholly-owned subsidiary of DaVinciRe Holdings Ltd. (“DaVinciRe”), is a managed joint venture formed by the Company to principally write property catastrophe reinsurance and certain casualty and specialty reinsurance lines of business on a global basis.

•Top Layer Reinsurance Ltd. is a managed joint venture formed by the Company to write high excess non-U.S. property catastrophe reinsurance.

•RenaissanceRe Underwriting Managers U.S. LLC, is licensed as a reinsurance intermediary broker in the State of Connecticut and underwrites specialty treaty reinsurance solutions on both a quota share and excess of loss basis on behalf of affiliates.

•Renaissance Underwriting Managers, Ltd. (“RUM”), a wholly owned subsidiary of RenaissanceRe, acts as exclusive underwriting manager for certain of our joint ventures or managed funds in return for fee-based income and profit participation.

•RenaissanceRe Fund Management Ltd. (“RFM”) is a wholly-owned Bermuda exempted company and acts as the exclusive investment fund manager for several of the Company’s joint ventures or managed funds, in return for a management fee, a performance based incentive fee, or both. RFM is registered as an Exempt Reporting Adviser with the Securities and Exchange Commission and serves as the investment adviser to third-party investors in the various private investment partnerships and insurance-related investment products offered by the Company.

•RenaissanceRe Medici Fund Ltd. (“Medici”) is an exempted company, incorporated under the laws of Bermuda and registered as an institutional fund. Medici invests, primarily on behalf of third-party investors, in various instruments that have returns primarily tied to property catastrophe risk.

•Upsilon RFO Re Ltd., formerly known as Upsilon Reinsurance II Ltd. (“Upsilon RFO”), a Bermuda domiciled special purpose insurer (“SPI”), is a managed fund formed by the Company principally to

12

provide additional capacity to the worldwide aggregate and per-occurrence primary and retrocessional property catastrophe excess of loss market.

•RenaissanceRe Upsilon Fund Ltd., an exempted Bermuda segregated accounts company registered as a Class A Professional Fund provides a fund structure through which third-party investors can invest in reinsurance risk managed by the Company.

•Vermeer Reinsurance Ltd. (“Vermeer”), an exempted Bermuda reinsurer, provides capacity focused on risk remote layers in the U.S. property catastrophe market. The Company maintains a majority voting control of Vermeer, while Stichting Pensioenfonds Zorg en Welzijn (“PFZW”), a pension fund represented by PGGM Vermogensbeheer B.V., a Dutch pension fund manager, retains economic benefits.

•Fibonacci Reinsurance Ltd. ("Fibonacci Re"), a Bermuda-domiciled SPI, provides 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.

•The Company and Reinsurance Group of America, Incorporated are engaged in an initiative (“Langhorne”) to source third-party capital to support reinsurers targeting large in-force life and annuity blocks. Langhorne Holdings LLC (“Langhorne Holdings”) was incorporated to own and manage certain reinsurance entities within Langhorne. Langhorne Partners LLC (“Langhorne Partners”) is the general partner for Langhorne and manages the third-parties investing in Langhorne Holdings.

•Mona Lisa Re Ltd. (“Mona Lisa Re”), a Bermuda domiciled SPI, provides reinsurance capacity to subsidiaries of RenaissanceRe, namely Renaissance Reinsurance and DaVinci, through reinsurance agreements which are collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes.

•Following the acquisition of Tokio Millennium Re AG and certain associated entities and subsidiaries (collectively, “TMR”) on March 22, 2019, the Company managed Shima Reinsurance Ltd. (“Shima Re”), Norwood Re Ltd. (“Norwood Re”) and Blizzard Re Ltd. (“Blizzard,” together with Shima Re and Norwood Re, the “TMR managed third-party capital vehicles”), which provided third-party investors with access to reinsurance risk. The TMR managed third-party capital vehicles no longer write new business. The Company ceased providing management services to Blizzard effective November 1, 2020, and Shima Re and Norwood Re effective December 1, 2020.

NOTE 2. 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, 2020, 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.

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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 recoverable and premiums receivable, including provisions for reinsurance recoverable and premiums receivable to reflect expected credit losses; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges; deferred acquisition costs and the value of business acquired and the Company’s deferred tax valuation allowance.

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (”ASU 2019-12”). Among other things, ASU 2019-12 eliminates certain exceptions for recognizing deferred taxes for investments, performing intraperiod tax allocation and calculating income taxes in interim periods. ASU 2019-12 also clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Accordingly, the Company adopted ASU 2019-12 effective January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s consolidated statements of operations and financial position.

NOTE 3. INVESTMENTS

Fixed Maturity Investments Trading

The following table summarizes the fair value of fixed maturity investments trading:

	March 31, 2021		December 31, 2020
U.S. treasuries	$	5,107,878	$	4,960,409
Agencies	227,184		368,032
Non-U.S. government	518,162		491,531
Non-U.S. government-backed corporate	335,662		338,014
Corporate	4,289,072		4,261,025
Agency mortgage-backed	957,563		1,113,792
Non-agency mortgage-backed	272,529		291,444
Commercial mortgage-backed	713,044		791,272
Asset-backed	888,140		890,984
Total fixed maturity investments trading	$	13,309,234	$	13,506,503

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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.

March 31, 2021	Amortized  Cost		Fair Value
Due in less than one year	$	568,444	$	572,443
Due after one through five years	5,498,414		5,569,638
Due after five through ten years	3,822,345		3,786,423
Due after ten years	562,618		549,453
Mortgage-backed	1,922,325		1,943,137
Asset-backed	884,839		888,140
Total	$	13,258,985	$	13,309,234

Equity Investments Trading

The following table summarizes the fair value of equity investments trading:

	March 31, 2021		December 31, 2020
Financials	$	241,360	$	452,765
Communications and technology	123,204		119,592
Consumer	45,586		44,477
Industrial, utilities and energy	48,935		43,380
Healthcare	36,248		35,140
Basic materials	7,804		7,263
Total	$	503,137	$	702,617

Pledged Investments

At March 31, 2021, $8.4 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, 2020 - $8.1 billion). Of this amount, $2.5 billion is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities (December 31, 2020 - $2.5 billion).

Reverse Repurchase Agreements

At March 31, 2021, the Company held $25.0 million (December 31, 2020 - $126.5 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.

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Net Investment Income

The components of net investment income are as follows:

	Three months ended
	March 31, 2021		March 31, 2020
Fixed maturity investments	$	62,933	$	73,338
Short term investments	573		12,092
Equity investments	1,491		1,551
Other investments
Catastrophe bonds	14,468		14,139
Other	3,801		1,629
Cash and cash equivalents	102		1,504
	83,368		104,253
Investment expenses	(3,564)		(4,780)
Net investment income	$	79,804	$	99,473

Net Realized and Unrealized Losses on Investments

Net realized and unrealized losses on investments are as follows:

	Three months ended
	March 31, 2021		March 31, 2020
Net realized gains on fixed maturity investments trading	$	20,398	$	57,487
Net unrealized losses on fixed maturity investments trading	(297,018)		(20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)		37,142
Net realized and unrealized gains on investments-related derivatives	14,861		33,181
Net realized gains (losses) on equity investments trading	109,887		(15,047)
Net unrealized losses on equity investments trading	(177,809)		(105,937)
Net realized and unrealized losses on equity investments trading	(67,922)		(120,984)
Net realized and unrealized losses on other investments - catastrophe bonds	(19,083)		(14,352)
Net realized and unrealized gains (losses) on other investments - other	3,201		(45,694)
Net realized and unrealized losses on investments	$	(345,563)	$	(110,707)

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NOTE 4. 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 as 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 at the measurement date. 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.

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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 March 31, 2021	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	$	5,107,878	$	5,107,878	$	—	$	—
Agencies	227,184		—		227,184		—
Non-U.S. government	518,162		—		518,162		—
Non-U.S. government-backed corporate	335,662		—		335,662		—
Corporate	4,289,072		—		4,289,072		—
Agency mortgage-backed	957,563		—		957,563		—
Non-agency mortgage-backed	272,529		—		272,529		—
Commercial mortgage-backed	713,044		—		713,044		—
Asset-backed	888,140		—		888,140		—
Total fixed maturity investments	13,309,234		5,107,878		8,201,356		—
Short term investments	5,091,143		—		5,091,143		—
Equity investments trading	503,137		503,137		—		—
Other investments
Catastrophe bonds	941,604		—		941,604		—
Private equity investments	75,874		—		—		75,874
	1,017,478		—		941,604		75,874
Fund investments (1)	361,578
Total other investments	1,379,056		—		941,604		75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,421)		—		—		(6,421)
Derivative assets (3)	20,449		2,317		18,132		—
Derivative liabilities (3)	(26,464)		(2,494)		(23,970)		—
Total other assets and (liabilities)	(12,436)		(177)		(5,838)		(6,421)
	$	20,270,134	$	5,610,838	$	14,228,265	$	69,453

(1)    Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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 March 31, 2021 was $0.6 million of other assets and $7.0 million of other liabilities.

(3)    See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

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At December 31, 2020	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	$	4,960,409	$	4,960,409	$	—	$	—
Agencies	368,032		—		368,032		—
Non-U.S. government	491,531		—		491,531		—
Non-U.S. government-backed corporate	338,014		—		338,014		—
Corporate	4,261,025		—		4,261,025		—
Agency mortgage-backed	1,113,792		—		1,113,792		—
Non-agency mortgage-backed	291,444		—		291,444		—
Commercial mortgage-backed	791,272		—		791,272		—
Asset-backed	890,984		—		890,984		—
Total fixed maturity investments	13,506,503		4,960,409		8,546,094		—
Short term investments	4,993,735		—		4,993,735		—
Equity investments trading	702,617		702,617		—		—
Other investments
Catastrophe bonds	881,290		—		881,290		—
Private equity investments	79,807		—		—		79,807
	961,097		—		881,290		79,807
Fund investments (1)	295,851
Total other investments	1,256,948		—		881,290		79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,211)		—		—		(6,211)
Derivative assets (3)	45,233		156		45,077		—
Derivative liabilities (3)	(22,360)		(567)		(21,793)		—
Total other assets and (liabilities)	16,662		(411)		23,284		(6,211)
	$	20,476,465	$	5,662,615	$	14,444,403	$	73,596

(1)     Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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, 2020 was $1.4 million of other assets and $7.6 million of other liabilities.

(3)     See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

Level 1 and Level 2 Assets and Liabilities Measured at Fair Value

Fixed Maturity Investments

Fixed maturity investments included in Level 1 consist of the Company’s investments in U.S. treasuries. Fixed maturity investments included in Level 2 are agencies, municipal, non-U.S. government, non-U.S. government-backed corporate, corporate, agency mortgage-backed, non-agency mortgage-backed, commercial mortgage-backed and asset-backed.

The Company’s fixed maturity investments are primarily priced using pricing services, such as index providers and pricing vendors, as well as broker quotations. In general, the pricing vendors provide pricing for a high volume of liquid securities that are actively traded. For securities that do not trade on an

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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 March 31, 2021, the Company’s U.S. treasuries fixed maturity investments were primarily priced by pricing services and had a weighted average yield to maturity of 0.7% and a weighted average credit quality of AA (December 31, 2020 - 0.4% and AA, respectively). When pricing these securities, the pricing services utilize daily data from many real time market sources, including active broker-dealers. Certain data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source is used for each issue and maturity date.

Agencies

Level 2 - At March 31, 2021, the Company’s agency fixed maturity investments had a weighted average yield to maturity of 1.4% and a weighted average credit quality of AA (December 31, 2020 - 0.9% 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.

Non-U.S. Government

Level 2 - At March 31, 2021, the Company’s non-U.S. government fixed maturity investments had a weighted average yield to maturity of 1.0% and a weighted average credit quality of AA (December 31, 2020 - 0.5% 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 March 31, 2021, the Company’s non-U.S. government-backed corporate fixed maturity investments had a weighted average yield to maturity of 1.2% and a weighted average credit quality of AA (December 31, 2020 - 1.0% and AA, respectively). Non-U.S. government-backed corporate fixed maturity

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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 quality 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 March 31, 2021, the Company’s corporate fixed maturity investments principally consisted of U.S. and international corporations and had a weighted average yield to maturity of 2.5% and a weighted average credit quality of BBB (December 31, 2020 - 2.2% 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 March 31, 2021, the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average yield to maturity of 1.7%, a weighted average credit quality of AA and a weighted average life of 4.9 years (December 31, 2020 - 1.0%, AA and 3.8 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 - At March 31, 2021, the Company’s non-agency residential mortgage-backed fixed maturity investments had a weighted average yield to maturity of 3.0%, a weighted average credit quality of non-investment grade and a weighted average life of 5.3 years (December 31, 2020 - 3.0%, non-investment grade and 5.2 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 March 31, 2021, the Company’s commercial mortgage-backed fixed maturity investments had a weighted average yield to maturity of 1.8%, a weighted average credit quality of AAA, and a weighted average life of 4.7 years (December 31, 2020 - 1.5%, 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.

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Asset-backed

Level 2 - At March 31, 2021, the Company’s asset-backed fixed maturity investments had a weighted average yield to maturity of 1.7%, a weighted average credit quality of AA and a weighted average life of 3.1 years (December 31, 2020 - 1.8%, AA and 3.2 years, respectively). The underlying collateral for the Company’s asset-backed fixed maturity investments primarily consists of collateralized loan obligations 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 March 31, 2021, the Company’s short term investments had a weighted average yield to maturity of 0.1% and a weighted average credit quality of AAA (December 31, 2020 - 0.1% 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.

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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 March 31, 2021	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	75,874	Internal valuation model	Discount rate	n/a	n/a	9.0%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(168)		Internal valuation model	Bond price	n/a	n/a	$	99.51
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(6,849)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,895
				Expected loss ratio	n/a	n/a	21.9		%
				Discount rate	n/a	n/a	0.9		%
Assumed and ceded (re)insurance contracts	596		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,421)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	69,453

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At December 31, 2020	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	79,807	Internal valuation model	Discount rate	n/a	n/a	9.0		%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(190)		Internal valuation model	Bond price	n/a	n/a	$	99.31
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(7,395)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,514
				Expected loss ratio	n/a	n/a	24.0		%
				Discount rate	n/a	n/a	0.4		%
Assumed and ceded (re)insurance contracts	1,374		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,211)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	73,596

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 - January 1, 2021	$	79,807	$	(6,211)	$	73,596
Total realized and unrealized losses
Included in net realized and unrealized losses on investments	(3,936)		—		(3,936)
Included in other income (loss)	—		96		96
Total foreign exchange gains	3		—		3
Purchases	—		(306)		(306)
Sales	—		—		—
Balance - March 31, 2021	$	75,874	$	(6,421)	$	69,453

	Other investments		Other assets  and (liabilities)		Total
Balance - January 1, 2020	$	74,634	$	4,731	$	79,365
Total realized and unrealized losses
Included in net realized and unrealized gains on investments	(14,156)		—		(14,156)
Included in other income (loss)	—		(2,897)		(2,897)
Total foreign exchange losses	(21)		—		(21)
Purchases	20,962		(611)		20,351
Sales	(8,799)		—		(8,799)
Balance - March 31, 2020	$	72,620	$	1,223	$	73,843

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Other Investments

Private Equity Investments

Level 3 - At March 31, 2021, the Company’s other investments included $75.9 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, and discount rates applied to the expected cash flows of the underlying entity in various scenarios. These unobservable inputs in isolation can cause significant increases or decreases in fair value. Generally, an increase in the liquidity discount rate or discount rates would result in a decrease in the fair value of these private equity investments.

Other Assets and Liabilities

Assumed and Ceded (Re)insurance Contracts

Level 3 - At March 31, 2021, the Company had a $0.2 million net liability 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 March 31, 2021, the Company had a $6.8 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 March 31, 2021, the Company had a $0.6 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.

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Debt

Included on the Company’s consolidated balance sheet at March 31, 2021 were debt obligations of $1.1 billion (December 31, 2020 - $1.1 billion). At March 31, 2021, the fair value of the Company’s debt obligations was $1.2 billion (December 31, 2020 – $1.3 billion).

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. Refer to “Note 7. Debt and Credit Facilities” for additional information related to 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:

	March 31, 2021		December 31, 2020
Other investments	$	1,379,056	$	1,256,948
Other assets	$	6,437	$	8,982
Other liabilities	$	12,858	$	15,193

Included in net realized and unrealized losses on investments for the three months ended March 31, 2021 was net unrealized gains of $3.2 million related to the changes in fair value of other investments (2020 – net unrealized losses of $4.7 million).

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 March 31, 2021	Fair Value		Unfunded Commitments		Redemption Frequency	Redemption Notice Period (Minimum Days)	Redemption Notice Period (Maximum Days)
Private equity funds	$	333,910	$	1,031,629	See below	See below	See below
Senior secured bank loan funds	16,886		7,920		See below	See below	See below
Hedge funds	10,782		—		See below	See below	See below
Total other investments measured using net asset valuations	$	361,578	$	1,039,549

Private Equity Funds

The Company’s investments in private equity funds include alternative asset limited partnerships (or similar corporate structures) that invest in certain private equity and private credit asset classes including U.S. and global leveraged buyouts, U.S. direct lending, secondaries, mezzanine investments, distressed securities, real estate, and oil, gas and power. The Company generally has no right to redeem its interest in any of these fund investments in advance of dissolution of the applicable limited partnerships. Instead, the nature of these investments is that distributions are received by the Company in connection with the liquidation of the underlying assets of the respective fund. It is estimated that the majority of the underlying assets of the limited partnerships would liquidate over 7 to 10 years from inception of the respective limited partnership.

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Senior Secured Bank Loan Funds

At March 31, 2021, the Company had $16.9 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. It is estimated that the majority of the underlying assets in these closed end funds would begin to liquidate over 4 to 5 years from inception of the applicable fund.

Hedge Funds

At March 31, 2021, the Company had $10.8 million of investments in hedge funds that are primarily focused on global credit opportunities which are generally redeemable at the option of the Company.

NOTE 5. 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
	March 31, 2021		March 31, 2020
Premiums written
Direct	$	225,139	$	147,692
Assumed	2,427,303		1,878,029
Ceded	(828,359)		(755,913)
Net premiums written	$	1,824,083	$	1,269,808
Premiums earned
Direct	$	162,089	$	134,229
Assumed	1,416,646		1,149,733
Ceded	(424,899)		(370,864)
Net premiums earned	$	1,153,836	$	913,098
Claims and claim expenses
Gross claims and claim expenses incurred	$	1,250,246	$	747,715
Claims and claim expenses recovered	(383,195)		(176,761)
Net claims and claim expenses incurred	$	867,051	$	570,954

In assessing an allowance for reinsurance assets, which includes premiums receivable and reinsurance recoverable, the Company considers historical information, financial strength of reinsurers, collateralization amounts, and ratings to determine the appropriateness of the allowance. In assessing future default for reinsurance assets, the Company evaluates the provision for current expected credit losses under the probability of default and loss given default method. The Company utilizes its internal capital and risk models, which use counterparty ratings from major rating agencies, and assesses the current market conditions for the likelihood of default. The Company updates its internal capital and risk models for counterparty ratings and current market conditions on a periodic basis. Historically, the Company has not experienced material credit losses from reinsurance assets.

Premiums receivable reflect premiums written based on contract and policy terms and include estimates based on information received from both insureds and ceding companies and our own judgment.

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Consequently, premiums receivable include premiums reported by the ceding companies, supplemented by our estimates of premiums that are written but not reported. Due to the nature of reinsurance, ceding companies routinely report and remit premiums to us subsequent to the contract coverage period, although the time lag involved in the process of reporting and collecting premiums is typically shorter than the lag in reporting losses.

At March 31, 2021, the Company’s premiums receivable balance was $3.9 billion (December 31, 2020 - $2.9 billion). Of the Company’s premiums receivable balance as of March 31, 2021, the majority are receivable from highly rated counterparties and Lloyd’s syndicates. The provision for current expected credit losses on the Company’s premiums receivable was $3.8 million at March 31, 2021 (December 31, 2020 - $6.0 million). The following table provides a roll forward of the provision for current expected credit losses of the Company’s premiums receivable:

Three months ended March 31	2021
Beginning balance	$	5,961
Provision for allowance	(2,179)
Ending balance	$	3,782

Reinsurance recoverable reflects amounts due from reinsurers based on the claim liabilities associated with the reinsured policy. The Company accrues amounts that are due from assuming companies based on estimated ultimate losses applicable to the contracts.

At March 31, 2021, the Company’s reinsurance recoverable balance was $3.2 billion (December 31, 2020 - $2.9 billion). Of the Company’s reinsurance recoverable balance at March 31, 2021, 45.2% is fully collateralized by our reinsurers, 52.9% is recoverable from reinsurers rated A- or higher by major rating agencies and 1.9% is recoverable from reinsurers rated lower than A- by major rating agencies (December 31, 2020 - 45.2%, 53.4% and 1.4%, respectively). The reinsurers with the three largest balances accounted for 15.0%, 10.2% and 6.1%, respectively, of the Company’s reinsurance recoverable balance at March 31, 2021 (December 31, 2020 - 15.3%, 10.8% and 6.7%, respectively). The provision for current expected credit losses was $6.6 million at March 31, 2021 (December 31, 2020 - $6.3 million). The three largest company-specific components of the provision for current expected credit losses represented 12.7%, 7.6% and 5.1%, respectively, of the Company’s total provision for current expected credit losses at March 31, 2021 (December 31, 2020 - 13.2%, 13.0% and 6.7%, respectively). The following table provides a roll forward of the provision for current expected credit losses of the Company’s reinsurance recoverable:

Three months ended March 31	2021
Beginning balance	$	6,334
Provision for allowance	271
Ending balance	$	6,605

NOTE 6. 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 Company’s reserving committee, which includes members of the Company’s senior management, reviews, discusses, and

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assesses the reasonableness and adequacy of the reserving estimates included in our unaudited financial statements.

The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR:

At March 31, 2021	Case Reserves		Additional Case Reserves		IBNR		Total
Property	$	1,292,683	$	1,333,734	$	2,145,953	$	4,772,370
Casualty and Specialty	1,801,362		147,822		4,231,829		6,181,013
Total	$	3,094,045	$	1,481,556	$	6,377,782	$	10,953,383
At December 31, 2020
Property	$	1,127,909	$	1,617,003	$	1,627,541	$	4,372,453
Casualty and Specialty	1,651,150		133,843		4,223,692		6,008,685
Total	$	2,779,059	$	1,750,846	$	5,851,233	$	10,381,138

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Activity in the liability for unpaid claims and claim expenses is summarized as follows:

Three months ended March 31	2021		2020
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period	$	7,455,128	$	6,593,052
Net incurred related to:
Current year	876,083		557,054
Prior years	(9,032)		13,900
Total net incurred	867,051		570,954
Net paid related to:
Current year	14,751		31,201
Prior years	486,488		436,286
Total net paid	501,239		467,487
Foreign exchange (1)	(28,224)		(55,395)
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period	7,792,716		6,641,124
Reinsurance recoverable as of end of period	3,160,667		2,765,583
Reserve for claims and claim expenses as of end of period	$	10,953,383	$	9,406,707

(1)    Reflects the impact of the foreign exchange revaluation of the net reserve for claims and claim expenses 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 recoverable, as well as changes to loss related premiums such as reinstatement premiums and redeemable noncontrolling interest, 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 net development by segment of its liability for unpaid claims and claim expenses:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Property	$	(5,162)	$	13,901
Casualty and Specialty	(3,870)		(1)
Total net (favorable) adverse development of prior accident years net claims and claim expenses	$	(9,032)	$	13,900

Changes to prior year estimated claims reserves increased net income by $9.0 million during the three months ended March 31, 2021 (2020 - decreased net income by $13.9 million), excluding the consideration of changes in reinstatement, adjustment or other premium items, profit commissions, redeemable noncontrolling interests - DaVinciRe and Vermeer, and income tax.

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Property Segment

The following tables detail the development of the Company’s liability for net 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:

Three months ended March 31	2021
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	(4,742)
2018 Large Loss Events	(3,263)
2017 Large Loss Events	(5,508)
Other	(679)
Total large catastrophe events	(14,192)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	9,030
Total small catastrophe events and attritional loss movements	9,030
Total catastrophe and attritional net claims and claim expenses	(5,162)
Total net favorable development of prior accident years net claims and claim expenses	$	(5,162)

The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the three months ended March 31, 2021 of $5.2 million was primarily comprised of net favorable development on prior accident years net claims and claim expenses associated with the following large catastrophe events:

•$4.7 million associated with Hurricane Dorian and Typhoon Faxai, Typhoon Hagibis and losses associated with aggregate loss contracts (collectively, the “2019 Large Loss Events”);

•$3.3 million associated with Typhoons Jebi, Mangkhut and Trami, Hurricane Florence, the wildfires in California during the third and fourth quarters of 2018, Hurricane Michael and certain losses associated with aggregate loss contracts (collectively, the ”2018 Large Loss Events”); and

•$5.5 million 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”).

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Three months ended March 31	2020
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	$	(19,681)
2018 Large Loss Events	(14,200)
2017 Large Loss Events	(6,237)
Other	8,027
Total large catastrophe events	(32,091)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	45,992
Total small catastrophe events and attritional loss movements	45,992
Total net adverse development of prior accident years net claims and claim expenses	$	13,901

The net adverse development of prior accident years net claims and claim expenses within the Company’s Property segment in the three months ended March 31, 2020 of $13.9 million was comprised of net adverse development of $54.0 million primarily within the Company’s other property class of business and principally driven by higher than expected attritional losses related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods, combined with the impact of certain of the Company’s whole account ceded protections. Partially offsetting this adverse development was favorable development on prior accident years net claims and claim expenses associated with the following large catastrophe events:

•$19.7 million associated with the 2019 Large Loss Events;

•$14.2 million associated with the 2018 Large Loss Events; and

•$6.2 million associated with the 2017 Large Loss Events.

Casualty and Specialty Segment

The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Actuarial methods - actual reported claims less than expected claims	$	(3,870)	$	(1)
Total net favorable development of prior accident years net claims and claim expenses	$	(3,870)	$	(1)

The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment of $3.9 million in the three months ended March 31, 2021 was due to reported losses generally coming in lower than expected on attritional net claims and claim expenses, principally within our specialty lines of business.

The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment of $1.0 thousand in the three months ended March 31, 2020 was due to reported losses generally coming in as expected on attritional net claims and claim expenses.

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NOTE 7. DEBT AND CREDIT FACILITIES

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, 2020.

Debt Obligations

A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below:

	March 31, 2021				December 31, 2020
	Fair Value		Carrying Value		Fair Value		Carrying Value
3.600% Senior Notes due 2029	$	431,360	$	392,619	$	453,932	$	392,391
3.450% Senior Notes due 2027	323,262		296,909		329,661		296,787
3.700% Senior Notes due 2025	310,881		298,519		315,273		298,428
4.750% Senior Notes due 2025 (DaVinciRe) (1)	165,746		148,736		162,203		148,659
Total debt	$	1,231,249	$	1,136,783	$	1,261,069	$	1,136,265

(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.

Credit Facilities

The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below:

At March 31, 2021	Issued or Drawn
Revolving Credit Facility (1)	$	—
Bilateral Letter of Credit Facilities
Secured	392,116
Unsecured	488,532
Funds at Lloyd’s Letter of Credit Facility	225,000
	$	1,105,648

(1)     At March 31, 2021, no amounts were issued or drawn under this facility.

NOTE 8. NONCONTROLLING INTERESTS

A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below:

	March 31, 2021		December 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	1,555,714	$	1,560,693
Redeemable noncontrolling interest - Medici	737,702		717,999
Redeemable noncontrolling interest - Vermeer	1,116,154		1,109,627
Redeemable noncontrolling interests	$	3,409,570	$	3,388,319

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A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations is set forth below:

	Three months ended
	March 31, 2021		March 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	(39,934)	$	84,906
Redeemable noncontrolling interest - Medici	(13,443)		(4,678)
Redeemable noncontrolling interest - Vermeer	6,527		17,863
Net (loss) income attributable to redeemable noncontrolling interests	$	(46,850)	$	98,091

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 and all significant intercompany transactions have been eliminated. 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 28.7% at March 31, 2021 (December 31, 2020 - 21.4%).

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.

2021

During the three months ended March 31, 2021, DaVinciRe completed an equity capital raise of $250.0 million, comprised of $150.9 million from third-party investors and $99.1 million from RenaissanceRe. In addition, RenaissanceRe sold an aggregate of $40.0 million of its shares in DaVinciRe to third-party investors and purchased an aggregate of $156.7 million of shares from third-party investors. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 28.7%.

2020

Effective January 1, 2020, the Company sold an aggregate of $10.0 million of its shares in DaVinciRe to an existing third-party investor. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to this transaction was 21.4%.

The Company expects its noncontrolling economic ownership in DaVinciRe to fluctuate over time.

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The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	1,560,693	$	1,435,581
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(155,971)		2,607
Sale of shares to redeemable noncontrolling interests	190,926		9,991
Net (loss) income attributable to redeemable noncontrolling interest	(39,934)		84,906
Ending balance	$	1,555,714	$	1,533,085

Redeemable Noncontrolling Interest - Medici

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.

2021

During the three months ended March 31, 2021, third-party investors subscribed for $40.8 million and redeemed $7.7 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 15.4% at March 31, 2021.

2020

During the three months ended March 31, 2020, third-party investors subscribed for $54.6 million and redeemed $4.8 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 11.2% at March 31, 2020.

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
	March 31, 2021		March 31, 2020
Beginning balance	$	717,999	$	632,112
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(7,699)		(4,764)
Sale of shares to redeemable noncontrolling interests	40,845		54,613
Net loss attributable to redeemable noncontrolling interest	(13,443)		(4,678)
Ending balance	$	737,702	$	677,283

Redeemable Noncontrolling Interest – Vermeer

RenaissanceRe owns 100% of the voting non-participating shares of Vermeer, while the sole third-party investor, PFZW, owns 100% of the non-voting participating shares of Vermeer and retains all of the economic benefits. Vermeer is managed by RUM in return for a management fee. The Company has 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 of Vermeer. As a result, the Company consolidates Vermeer and all significant inter-company transactions have been eliminated. As PFZW owns all of the economics of Vermeer, all of Vermeer’s earnings are allocated to PFZW in the consolidated statement 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.

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The activity in redeemable noncontrolling interest – Vermeer is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	1,109,627	$	1,003,615
Net income attributable to redeemable noncontrolling interest	6,527		17,863
Ending balance	$	1,116,154	$	1,021,478

NOTE 9. VARIABLE INTEREST ENTITIES

Upsilon RFO

RenaissanceRe indirectly owns a portion of the participating non-voting preference shares of Upsilon RFO and all of Upsilon RFO’s voting Class A shares. The shareholders (other than the voting Class A shareholder) participate in all of the profits or losses of Upsilon RFO while their shares remain outstanding. The shareholders (other than the voting 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.

2021

During the three months ended March 31, 2021, $470.3 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $32.3 million to the Company. Also during the three months ended March 31, 2021 and following the release of collateral that was previously held by cedants associated with prior years’ contracts, Upsilon RFO returned $145.0 million of capital to its investors, including $9.2 million to the Company. At March 31, 2021, the Company’s participation in the risks assumed by Upsilon RFO was 12.8%.

At March 31, 2021, the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $3.9 billion and $3.9 billion, respectively (December 31, 2020 - $3.8 billion and $3.8 billion, respectively). Of the total assets and liabilities, a net amount of $2.0 billion is attributable to the Company, and $0.3 billion is attributable to third-party investors.

2020

During the three months ended March 31, 2020, Upsilon RFO returned $81.8 million of capital to its investors, including $29.9 million to the Company. In addition, during the three months ended March 31, 2020, $620.9 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $75.4 million to the Company. At March 31, 2020, the Company’s participation in the risks assumed by Upsilon RFO was 14.2%.

Vermeer

Vermeer provides capacity focused on risk remote layers in the U.S. property catastrophe market. See “Note 8. Noncontrolling Interests” for additional information regarding Vermeer.

At March 31, 2021, the Company’s consolidated balance sheet included total assets and total liabilities of Vermeer of $1.2 billion and $47.5 million, respectively (December 31, 2020 - $1.1 billion and $36.7 million, respectively). In addition, the Company’s consolidated balance sheet included redeemable noncontrolling interests associated with Vermeer of $1.1 billion at March 31, 2021 (December 31, 2020 - $1.1 billion).

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Mona Lisa Re Ltd.

Mona Lisa Re provides reinsurance capacity to subsidiaries of RenaissanceRe through reinsurance agreements which are collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes to third-party investors.

Upon issuance of a series of notes by Mona Lisa Re, all of the proceeds from the issuance are deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance and/or DaVinci underlying such series of notes. The outstanding principal amount of each series of notes generally will be returned to holders of such notes upon the expiration of the risk period underlying such notes, unless an event occurs which causes a loss under the applicable series of notes, in which case the amount returned will be reduced by such noteholder’s pro rata share of such loss, as specified in the applicable governing documents of such notes.

In addition, holders of such notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of notes.

The Company concluded that Mona Lisa Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. The Company evaluated its relationship with Mona Lisa Re and concluded it is not the primary beneficiary of Mona Lisa Re as it does not have the power over the activities that most significantly impact the economic performance of Mona Lisa Re, in accordance with the accounting guidance. As a result, the financial position and results of operations of Mona Lisa Re are not consolidated by the Company.

The only transactions related to Mona Lisa Re that are recorded in the Company’s consolidated financial statements are the ceded reinsurance agreements entered into by Renaissance Reinsurance and DaVinci which are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance, and the fair value of the principal-at-risk variable rate notes owned by the Company. Other than its investment in the principal-at-risk variable rate notes of Mona Lisa Re, the Company has not provided financial or other support to Mona Lisa Re that it was not contractually required to provide.

Renaissance Reinsurance and DaVinci have together entered into ceded reinsurance contracts with Mona Lisa Re with ceded premiums written of $28.3 million and $6.4 million, respectively, during the three months ended March 31, 2021 (2020 - $24.3 million and $6.7 million, respectively). In addition, Renaissance Reinsurance and DaVinci recognized ceded premiums earned related to the ceded reinsurance contracts with Mona Lisa Re of $9.5 million and $1.7 million, respectively, during the three months ended March 31, 2021 (2020 - $24.3 million and $6.7 million, respectively).

At March 31, 2021, the total assets and total liabilities of Mona Lisa Re were $423.8 million and $423.8 million, respectively (December 31, 2020 - $400.3 million and $400.3 million, respectively).

The fair value of the Company’s investment in the principal-at-risk variable rate notes of Mona Lisa Re is included in other investments. Net of third-party investors, the fair value of the Company’s investment in Mona Lisa Re was $3.7 million at March 31, 2021 (December 31, 2020 - $3.7 million).

Fibonacci Re

Fibonacci Re provides collateralized capacity to Renaissance Reinsurance and its affiliates.

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 are recorded in the Company’s consolidated financial statements are 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.

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Renaissance Reinsurance entered into ceded reinsurance contracts with Fibonacci Re with ceded premiums written of $Nil and ceded premiums earned of $Nil during the three months ended March 31, 2021 (2020 - $Nil and $Nil, respectively). During the three months ended March 31, 2021, Renaissance Reinsurance reduced its net claims and claim expenses ceded to Fibonacci Re by $Nil (2020 - ceded net claims and claim expenses of $1.1 million) and as of March 31, 2021 had a net reinsurance recoverable of $Nil from Fibonacci Re (December 31, 2020 - $Nil).

The fair value of the Company’s investment in the participating notes of Fibonacci Re is included in other investments. During 2020, all previously outstanding series of notes issued by Fibonacci Re were redeemed and the proceeds were returned to the holders of such notes. Net of third-party investors, the fair value of the Company’s investment in Fibonacci Re was $Nil at March 31, 2021 (December 31, 2020 - $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 March 31, 2021 the Company has invested $2.1 million in Langhorne Holdings (December 31, 2020 - $2.0 million), a company that owns and manages certain reinsurance entities within Langhorne. In addition, as of March 31, 2021 the Company has invested $0.1 million in Langhorne Partners (December 31, 2020 - $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

Shima Re was acquired on March 22, 2019 in connection with the acquisition of TMR. Shima Re is a Bermuda domiciled Class 3 insurer. Shima Re is registered as a segregated accounts company and provides third-party investors with access to reinsurance risk. The maximum remaining exposure of each segregated account is fully collateralized and is funded by cash or investments as prescribed by the participant thereto. Shima Re no longer writes new business and the last in-force contract written by Shima Re expired on December 31, 2019. The Company ceased providing management services to Shima Re effective December 1, 2020.

Shima Re is considered a VIE as it has voting rights that are not proportional to its participating rights. The Company evaluated its relationship with Shima 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 or its segregated accounts. The Company has not provided any financial or other support to any segregated account of Shima Re that it was not contractually required to provide.

Norwood Re

Until December 1, 2020, Norwood Re was managed by a subsidiary of RREAG that the Company acquired in the acquisition of TMR. Norwood Re is a Bermuda domiciled SPI registered as a segregated accounts company formed to provide solutions for reinsurance-linked asset investors. Norwood Re is wholly owned

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by the Norwood Re Purpose Trust. Risks assumed by the segregated accounts of Norwood Re are fronted by or ceded from only one cedant - RREAG and/or its insurance affiliates. The obligations of each segregated account are funded through the issuance of non-voting preference shares to third-party investors. The maximum exposure of each segregated account is fully collateralized and is funded by cash and term deposits or investments as prescribed by the participant thereto. Norwood Re no longer writes new business, and the last in-force contract written by Norwood Re expired on June 30, 2020. The Company ceased providing management services to Norwood Re effective December 1, 2020.

Norwood Re is considered a VIE as it has voting rights that are not proportional to its participating rights. The Company evaluated its relationship with Norwood Re and concluded it is not the primary beneficiary of Norwood Re and its segregated accounts, as it does not have power over the activities that most significantly impact the economic performance of Norwood Re and its segregated accounts. As a result, the Company does not consolidate the financial position or results of operations of Norwood Re and its segregated accounts. The Company has not provided any financial or other support to Norwood Re that it was not contractually required to provide.

NOTE 10. SHAREHOLDERS’ EQUITY

Common Shares

On June 5, 2020, the Company issued 6,325,000 of its common shares in an underwritten public offering at a public offering price of $166.00 per share. Concurrently with the public offering, the Company raised $75.0 million through the issuance of 451,807 of its common shares at a price of $166.00 per share to State Farm Mutual Automobile Insurance Company, one of the Company’s existing stockholders, in a private placement. The total net proceeds from the offerings were $1.1 billion.

Series C 6.08% Preference Shares Redemption

The Series C 6.08% Preference Shares were redeemed on March 26, 2020 for $125.0 million plus accrued and unpaid dividends thereon. Following the redemption, no Series C 6.08% Preference Shares remain outstanding.

Dividends

The Board of Directors of RenaissanceRe declared a dividend of $0.36 per common share, payable to common shareholders of record on March 15, 2021, and the Company paid the dividend on March 31, 2021.

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 was 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), and was paid prior to the redemption in full of the Series C 6.08% shares on March 26, 2020. 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 three months ended March 31, 2021, the Company paid $7.3 million in preference share dividends (2020 - $9.1 million) and $17.8 million in common share dividends (2020 - $15.4 million).

Share Repurchases

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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 February 5, 2021, 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 three months ended March 31, 2021, the Company repurchased 1,076,344 common shares in open market transactions at an aggregate cost of $171.6 million and an average price of $159.47 per common share. At March 31, 2021, $328.4 million remained available for repurchase under the share repurchase program.

Refer to Note 15. “Subsequent Events” for additional information related to common share repurchases subsequent to March 31, 2021.

NOTE 11. EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per common share:

	Three months ended
(common shares in thousands)	March 31, 2021		March 31, 2020
Numerator:
Net loss attributable to RenaissanceRe common shareholders	$	(290,934)	$	(81,974)
Amount allocated to participating common shareholders (1)	(129)		(146)
Net loss allocated to RenaissanceRe common shareholders	$	(291,063)	$	(82,120)
Denominator:
Denominator for basic loss per RenaissanceRe common share - weighted average common shares	49,579		43,441
Per common share equivalents of employee stock options and non-vested shares	—		—
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	49,579		43,441
Net loss attributable to RenaissanceRe common shareholders per common share – basic	$	(5.87)	$	(1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted	$	(5.87)	$	(1.89)

(1)Represents earnings and dividends attributable to holders of unvested shares issued pursuant to the Company's stock compensation plans.

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NOTE 12. 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 and managed funds, 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 and managed funds. 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 and certain expenses related to acquisitions and disposals.

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 March 31, 2021	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,616,819		$	1,035,623		$	—	$	2,652,442
Net premiums written	$	1,008,460		$	815,623		$	—	$	1,824,083
Net premiums earned	$	605,166		$	548,670		$	—	$	1,153,836
Net claims and claim expenses incurred	498,832			368,219			—		867,051
Acquisition expenses	112,754			154,480			—		267,234
Operational expenses	35,375			19,936			—		55,311
Underwriting (loss) income	$	(41,795)		$	6,035		$	—	(35,760)
Net investment income							79,804		79,804
Net foreign exchange losses							(22,788)		(22,788)
Equity in earnings of other ventures							(5,558)		(5,558)
Other income							2,171		2,171
Net realized and unrealized losses on investments							(345,563)		(345,563)
Corporate expenses							(10,405)		(10,405)
Interest expense							(11,912)		(11,912)
Loss before taxes									(350,011)
Income tax benefit							19,516		19,516
Net loss attributable to redeemable noncontrolling interests							46,850		46,850
Dividends on preference shares							(7,289)		(7,289)
Net loss attributable to RenaissanceRe common shareholders									$	(290,934)
Net claims and claim expenses incurred – current accident year	$	503,994		$	372,089		$	—	$	876,083
Net claims and claim expenses incurred – prior accident years	(5,162)			(3,870)			—		(9,032)
Net claims and claim expenses incurred – total	$	498,832		$	368,219		$	—	$	867,051
Net claims and claim expense ratio – current accident year	83.3		%	67.8		%			75.9		%
Net claims and claim expense ratio – prior accident years	(0.9)		%	(0.7)		%			(0.8)		%
Net claims and claim expense ratio – calendar year	82.4		%	67.1		%			75.1		%
Underwriting expense ratio	24.5		%	31.8		%			28.0		%
Combined ratio	106.9		%	98.9		%			103.1		%

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Three months ended March 31, 2020	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,220,526		$	805,195		$	—	$	2,025,721
Net premiums written	$	674,581		$	595,227		$	—	$	1,269,808
Net premiums earned	$	421,335		$	491,763		$	—	$	913,098
Net claims and claim expenses incurred	144,745			426,209			—		570,954
Acquisition expenses	85,351			125,253			—		210,604
Operational expenses	44,007			23,454			—		67,461
Underwriting income (loss)	$	147,232		$	(83,153)		$	—	64,079
Net investment income							99,473		99,473
Net foreign exchange losses							(5,728)		(5,728)
Equity in earnings of other ventures							4,564		4,564
Other loss							(4,436)		(4,436)
Net realized and unrealized losses on investments							(110,707)		(110,707)
Corporate expenses							(15,991)		(15,991)
Interest expense							(14,927)		(14,927)
Income before taxes									16,327
Income tax benefit							8,846		8,846
Net income attributable to redeemable noncontrolling interests							(98,091)		(98,091)
Dividends on preference shares							(9,056)		(9,056)
Net loss attributable to RenaissanceRe common shareholders									$	(81,974)
Net claims and claim expenses incurred – current accident year	$	130,844		$	426,210		$	—	$	557,054
Net claims and claim expenses incurred – prior accident years	13,901			(1)			—		13,900
Net claims and claim expenses incurred – total	$	144,745		$	426,209		$	—	$	570,954
Net claims and claim expense ratio – current accident year	31.1		%	86.7		%			61.0		%
Net claims and claim expense ratio – prior accident years	3.3		%	—		%			1.5		%
Net claims and claim expense ratio – calendar year	34.4		%	86.7		%			62.5		%
Underwriting expense ratio	30.7		%	30.2		%			30.5		%
Combined ratio	65.1		%	116.9		%			93.0		%

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NOTE 13. 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.

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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 March 31, 2021	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	$	2,317	$	—	$	2,317	Other assets	$	—	$	2,317
Interest rate swaps	232		—		232		Other assets	—		232
Foreign currency forward contracts (1)	13,064		—		13,064		Other assets	—		13,064
Foreign currency forward contracts (2)	2,750		143		2,607		Other assets	—		2,607
Credit default swaps	211		—		211		Other assets	—		211
Total derivative instruments not designated as hedges	18,574		143		18,431			—		18,431
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,018		—		2,018		Other assets	—		2,018
Total	$	20,592	$	143	$	20,449		$	—	$	20,449
	Derivative Liabilities
At March 31, 2021	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	$	2,494	$	—	$	2,494	Other liabilities	$	2,494	$	—
Foreign currency forward contracts (1)	17,573		—		17,573		Other liabilities	—		17,573
Foreign currency forward contracts (2)	4,175		143		4,032		Other liabilities	—		4,032
Total derivative instruments not designated as hedges	24,242		143		24,099			2,494		21,605
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,365		—		2,365		Other liabilities	—		2,365
Total	$	26,607	$	143	$	26,464		$	2,494	$	23,970

(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 net investments in foreign operations.

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	Derivative Assets
At December 31, 2020	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	$	1,019	$	863	$	156	Other assets	$	—	$	156
Interest rate swaps	22		—		22		Other assets	—		22
Foreign currency forward contracts (1)	23,055		184		22,871		Other assets	—		22,871
Foreign currency forward contracts (2)	2,232		69		2,163		Other assets	—		2,163
Credit default swaps	68		—		68		Other assets	—		68
Total derivative instruments not designated as hedges	26,396		1,116		25,280			—		25,280
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	19,953		—		19,953		Other assets	—		19,953
Total	$	46,349	$	1,116	$	45,233		$	—	$	45,233
	Derivative Liabilities
At December 31, 2020	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	$	1,430	$	863	$	567	Other liabilities	$	567	$	—
Foreign currency forward contracts (1)	12,791		—		12,791		Other liabilities	—		12,791
Foreign currency forward contracts (2)	3,919		69		3,850		Other liabilities	1,053		2,797
Total derivative instruments not designated as hedges	18,140		932		17,208			1,620		15,588
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	5,152		—		5,152		Other liabilities	—		5,152
Total	$	23,292	$	932	$	22,360		$	1,620	$	20,740

(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 net investments in foreign operations.

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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 March 31		2021		2020
Derivative instruments not designated as hedges
Interest rate futures	Net realized and unrealized losses on investments	$	15,507	$	88,006
Interest rate swaps	Net realized and unrealized losses on investments	(901)		2,107
Foreign currency forward contracts (1)	Net foreign exchange losses	(3,641)		(330)
Foreign currency forward contracts (2)	Net foreign exchange losses	(5,061)		6,400
Credit default swaps	Net realized and unrealized losses on investments	255		(4,897)
Total return swaps	Net realized and unrealized losses on investments	—		(21,137)
Equity futures	Net realized and unrealized losses on investments	—		(30,898)
Total derivative instruments not designated as hedges		6,159		39,251
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	Accumulated other comprehensive loss	(2,089)		10,844
Total derivative instruments designated as hedges		(2,089)		10,844
Total		$	4,070	$	50,095

(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 net investments in foreign operations.

The Company is not aware of the existence of any credit-risk related contingent features that it believes would be triggered in its derivative instruments that are in a net liability position at March 31, 2021.

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 March 31, 2021, the Company had $1.8 billion of notional long positions and $0.9 billion of notional short positions of primarily Eurodollar and U.S. treasury futures contracts (December 31, 2020 - $2.0 billion and $1.0 billion, 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 March 31, 2021, the Company had $Nil of notional positions paying a fixed rate and $20.2 million receiving a fixed rate denominated in U.S. dollar swap contracts (December 31, 2020 - $Nil and $23.5 million, respectively).

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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 enter into foreign currency forward and option contracts for notional values that approximate the foreign currency liabilities, including claims and claim expense reserves and reinsurance balances payable, net of any cash, investments and receivables held in the respective foreign currency. The Company's use of foreign currency forward and option contracts is intended 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 Company may determine not to match a portion of its projected underwriting related assets or liabilities with underlying foreign currency exposure with investments in the same currencies, which would increase its exposure to foreign currency fluctuations and potentially increase the impact and volatility of foreign exchange gains and losses on its results of 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 March 31, 2021, the Company had outstanding underwriting related foreign currency contracts of $843.3 million in notional long positions and $355.6 million in notional short positions, denominated in U.S. dollars (December 31, 2020 - $661.4 million and $504.2 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 March 31, 2021, the Company had outstanding investment portfolio related foreign currency contracts of $265.5 million in notional long positions and $139.3 million in notional short positions, denominated in U.S. dollars (December 31, 2020 - $269.5 million and $117.5 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 March 31, 2021, the Company had outstanding credit default swaps of $25.0 million in notional positions to hedge credit risk and $77.9 million in notional positions to assume credit risk, denominated in U.S. dollars (December 31, 2020 - $Nil and $96.8 million, respectively).

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Total Return Swaps

From time to time, 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 March 31, 2021 and December 31, 2020, the Company had no outstanding total return swaps, respectively.

Equity Derivatives

Equity Futures

From time to time, 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 March 31, 2021 and December 31, 2020, the Company had no outstanding equity futures, respectively.

Derivative Instruments Designated as Hedges of Net Investments in Foreign Operations

Foreign Currency Derivatives

Hedges of Net Investments in Foreign Operations

Certain of the Company’s subsidiaries use non-U.S. dollar functional currencies. The Company, from time to time, enters into foreign exchange forwards to hedge currencies, which currently includes the Australian dollar and Euro net investment in foreign operations, on an after-tax basis, from changes in the exchange rate between the U.S. dollar and these currencies.

The Company utilizes foreign exchange forward contracts to hedge the fair value of its net investment in a foreign operation. The Company has entered into foreign exchange forward contracts that were formally designated as hedges of its investment in subsidiaries with non-U.S. dollar functional currencies. There was no ineffectiveness in these transactions.

The table below provides a summary of derivative instruments designated as hedges of net investments in foreign operations, including the weighted average U.S. dollar equivalent of foreign denominated net (liabilities) assets that were hedged and the resulting derivative (losses) gains that are recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive (loss) income on the Company’s consolidated statements of changes in shareholders’ equity:

	Three months ended
	March 31, 2021		March 31, 2020
Weighted average of U.S. dollar equivalent of foreign denominated net (liabilities) assets	$	(97,219)	$	76,804
Derivative (losses) gains (1)	$	(2,089)	$	10,844

(1)    Derivative (losses) 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) income on the Company’s consolidated statements of changes in shareholders’ equity.

NOTE 14. 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, 2020.

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

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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.

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NOTE 15. SUBSEQUENT EVENTS

Effective April 1, 2021, the Company raised over $100.0 million of capital through Medici. Following this transaction, the Company’s ownership in Medici was 13.7%.

Subsequent to March 31, 2021 and through the period ended April 23, 2021, we repurchased 330 thousand common shares in open market transactions at an aggregate cost of $55.3 million and an average price of $167.62 per common share.

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ITEM 2.        MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is a discussion and analysis of our results of operations for the three months ended March 31, 2021 and 2020, respectively, as well as our liquidity and capital resources at March 31, 2021. This discussion and analysis should be read in conjunction with the unaudited consolidated financial statements and notes thereto included in this filing and the audited consolidated financial statements and notes thereto contained in our Form 10-K for the fiscal year ended December 31, 2020. This filing contains forward-looking statements that involve risks and uncertainties. Actual results may differ materially from the results described or implied by these forward-looking statements. See “Note on Forward-Looking Statements.”

In this Form 10-Q, references to “RenaissanceRe” refer to RenaissanceRe Holdings Ltd. (the parent company) and references to “we,” “us,” “our” and the “Company” refer to RenaissanceRe Holdings Ltd. together with its subsidiaries, unless the context requires otherwise.

All dollar amounts referred to in this Form 10-Q are in U.S. dollars unless otherwise indicated.

Due to rounding, numbers presented in the tables included in this Form 10-Q may not add up precisely to the totals provided.

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INDEX TO MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

	Page
OVERVIEW	52
SUMMARY OF CRITICAL ACCOUNTING ESTIMATES	54
SUMMARY RESULTS OF OPERATIONS	55
FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES	65
Financial Condition	65
Liquidity and Cash Flows	65
Capital Resources	70
Reserve for Claims and Claim Expenses	71
Investments	72
Ratings	74
EFFECTS OF INFLATION	76
OFF-BALANCE SHEET AND SPECIAL PURPOSE ENTITY ARRANGEMENTS	76
CONTRACTUAL OBLIGATIONS	76
CURRENT OUTLOOK	76

OVERVIEW

RenaissanceRe is a global provider of reinsurance and insurance. We provide property, casualty and specialty reinsurance and certain insurance solutions to customers, principally through intermediaries. Established in 1993, we have offices in Bermuda, Australia, Ireland, Singapore, Switzerland, the U.K., and the U.S. Our operating subsidiaries include Renaissance Reinsurance, Renaissance Reinsurance U.S. Inc., RenaissanceRe Specialty U.S. Ltd. (“RenaissanceRe Specialty U.S.”), RenaissanceRe Europe AG (“RREAG”), Renaissance Reinsurance of Europe Unlimited Company (“Renaissance Reinsurance of Europe”) and our Lloyd’s syndicate, RenaissanceRe Syndicate 1458 (“Syndicate 1458”). We also underwrite reinsurance on behalf of joint ventures, including DaVinci Reinsurance Ltd. (“DaVinci”), Top Layer Reinsurance Ltd. (“Top Layer Re”), Upsilon RFO Re Ltd. (“Upsilon RFO”) and Vermeer Reinsurance Ltd. (“Vermeer”). In addition, through RenaissanceRe Medici Fund Ltd. (“Medici”), we invest in various insurance-based investment instruments that have returns primarily tied to property catastrophe risk.

We aspire to be the world’s best underwriter by matching well-structured risks with efficient sources of capital and our mission is to produce superior returns for our shareholders over the long term. We seek to accomplish these goals by being a trusted, long-term partner to our customers for assessing and managing risk, delivering responsive and innovative solutions, leveraging our core capabilities of risk assessment and information management, investing in these core capabilities in order to serve our customers across market cycles, and keeping our promises. Our strategy focuses on superior risk selection, superior customer relationships and superior capital management. We provide value to our customers and joint venture and managed funds partners in the form of financial security, innovative products, and responsive service. We are known as a leader in paying valid claims promptly. We principally measure our financial success through long-term growth in tangible book value per common share plus the change in accumulated dividends, which we believe is the most appropriate measure of our financial performance, and in respect of which we believe we have delivered superior performance over time. The principal drivers of our profit are underwriting income, investment income and fee income generated by our third-party capital management business.

Our core products include property, casualty and specialty reinsurance, and certain insurance products principally distributed through intermediaries, with whom we have cultivated strong long-term relationships. We believe we have been one of the world’s leading providers of catastrophe reinsurance since our founding. In recent years, through the strategic execution of several initiatives, including organic growth and acquisitions, we have expanded and diversified our casualty and specialty platform and products, and believe we are a leader in certain casualty and specialty lines of business. We also pursue a number of other opportunities, such as creating and managing our joint ventures and managed funds, executing

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customized reinsurance transactions to assume or cede risk, and managing certain strategic investments directed at classes of risk other than catastrophe reinsurance. From time to time we consider diversification into new ventures, either through organic growth, the formation of new joint ventures or managed funds, or the acquisition of, or the investment in, other companies or books of business of other companies.

We have determined our business consists of the following reportable segments: (1) Property, which is comprised of catastrophe and other property reinsurance and insurance written on behalf of our operating subsidiaries and certain joint ventures and managed funds, and (2) Casualty and Specialty, which is comprised of casualty and specialty reinsurance and insurance written on behalf of our operating subsidiaries and certain joint ventures and managed funds.

To best serve our clients in the places they do business, we have operating subsidiaries, branches, joint ventures, managed funds and underwriting platforms around the world. We write property and casualty and specialty reinsurance through our wholly owned operating subsidiaries, joint ventures, managed funds and Syndicate 1458 and certain insurance products primarily through Syndicate 1458 and RenaissanceRe Specialty U.S. Syndicate 1458 provides us with access to Lloyd’s extensive distribution network and worldwide licenses, and also writes business through delegated authority arrangements. The underwriting results of our operating subsidiaries and underwriting platforms are included in our Property and Casualty and Specialty segment results as appropriate.

A meaningful portion of the reinsurance and insurance we write provides protection from damages relating to natural and man-made catastrophes. Our results depend to a large extent on the frequency and severity of these catastrophic events, and the coverages we offer to customers affected by these events. We are exposed to significant losses from these catastrophic events and other exposures we cover, which primarily impact our Property segment, in both the property catastrophe and other property lines of business. Accordingly, we expect a significant degree of volatility in our financial results and our financial results may vary significantly from quarter-to-quarter and from year-to-year, based on the level of insured catastrophic losses occurring around the world. Our Casualty and Specialty business, which represents approximately half of our gross premiums written annually, is an efficient use of capital that is generally less correlated with our Property business. It allows us to bring additional capacity to our clients, across a wider range of product offerings, while continuing to be good stewards of our shareholders’ capital.

We continually explore appropriate and efficient ways to address the risk needs of our clients and the impact of various regulatory and legislative changes on our operations. We have created and managed, and continue to manage, multiple capital vehicles across several jurisdictions and may create additional risk bearing vehicles or enter into additional jurisdictions in the future. In addition, our differentiated strategy and capabilities position us to pursue bespoke or large solutions for clients, which may be non-recurring. This, and other factors including the timing of contract inception, could result in significant volatility of premiums in both our Property and Casualty and Specialty segments. As our product and geographical diversity increases, we may be exposed to new risks, uncertainties and sources of volatility.

Our revenues are principally derived from three sources: (1) net premiums earned from the reinsurance and insurance policies we sell; (2) net investment income and realized and unrealized gains from the investment of our capital funds and the investment of the cash we receive on the policies which we sell; and (3) fees and other income received from our joint ventures and managed funds, advisory services and various other items.

Our expenses primarily consist of: (1) net claims and claim expenses incurred on the policies of reinsurance and insurance we sell; (2) acquisition costs which typically represent a percentage of the premiums we write; (3) operating expenses which primarily consist of personnel expenses, rent and other operating expenses; (4) corporate expenses which include certain executive, legal and consulting expenses, costs for research and development, transaction and integration-related expenses, and other miscellaneous costs, including those associated with operating as a publicly traded company; (5) redeemable noncontrolling interests, which represent the interests of third parties with respect to the net income of DaVinciRe Holdings Ltd. (“DaVinciRe”), Medici and Vermeer; and (6) interest and dividend costs related to our debt and preference shares. We are also subject to taxes in certain jurisdictions in which we operate. Since the majority of our income is currently earned in Bermuda, which does not have a corporate income tax, the tax impact to our operations has historically been minimal. In the future, our net tax exposure may increase as our operations expand geographically, or as a result of adverse tax developments.

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The underwriting results of an insurance or reinsurance company are discussed frequently by reference to its net claims and claim expense ratio, underwriting expense ratio, and combined ratio. The net claims and claim expense ratio is calculated by dividing net claims and claim expenses incurred by net premiums earned. The underwriting expense ratio is calculated by dividing underwriting expenses (acquisition expenses and operational expenses) by net premiums earned. The combined ratio is the sum of the net claims and claim expense ratio and the underwriting expense ratio. A combined ratio below 100% indicates profitable underwriting prior to the consideration of investment income. A combined ratio over 100% indicates unprofitable underwriting prior to the consideration of investment income. We also discuss our net claims and claim expense ratio on a current accident year basis and a prior accident years basis. The current accident year net claims and claim expense ratio is calculated by taking current accident year net claims and claim expenses incurred, divided by net premiums earned. The prior accident years net claims and claim expense ratio is calculated by taking prior accident years net claims and claim expenses incurred, divided by net premiums earned.

Segments

Our reportable segments are defined as follows: (1) Property, which is comprised of catastrophe and other property reinsurance and insurance written on behalf of our operating subsidiaries and certain joint ventures and managed funds, and (2) Casualty and Specialty, which is comprised of casualty and specialty reinsurance and insurance written on behalf of our operating subsidiaries and certain joint ventures and managed funds. In addition to our two reportable segments, we have an Other category, which primarily includes our strategic investments, investments unit, corporate expenses, capital servicing costs, noncontrolling interests and certain expenses related to acquisitions and disposals.

COVID-19 Pandemic

In late 2019, an outbreak of a novel strain of coronavirus emerged and has since spread globally. It is not yet possible to give an estimate of all of the Company’s potential reinsurance, insurance or investment exposures, or any other effects that the COVID-19 pandemic may have on our results of operations or financial condition. Due to the ongoing and rapidly evolving nature of the COVID-19 pandemic, we are continuing to evaluate the impact of the COVID-19 pandemic on our business, operations and financial condition, including our potential loss exposures.

We approach estimation of our potential loss exposure by dividing our exposures into three categories: (1) event-like losses, such as event contingency, event-based casualty class and certain types of accident and health, (2) developing losses, such as traditional casualty lines, financial credit lines, such as mortgage and trade credit and surety, and (3) known unknowns, which is primarily business interruption. We continue to evaluate industry trends and our potential exposure associated with the ongoing COVID-19 pandemic, and expect historically significant industry losses to emerge over time as the full impact of the pandemic and its effects on the global economy are realized. A longer or more severe recession will increase the probability of losses. Potential legislative, regulatory and judicial actions are also causing significant uncertainty with respect to policy coverage and other issues. Among other things, we continue to actively monitor information received from or reported by clients, brokers, industry actuaries, regulators, courts, and others, and to assess that information in the context of our own portfolio.

In addition to coverage exposures, volatility in global financial markets, together with low or negative interest rates, reduced liquidity and a slowdown in global economic conditions in many economies, have impacted, and may affect, our investment portfolio in the future. These conditions may also negatively impact our ability to access liquidity and capital markets financing, which may not be available or may only be available on unfavorable terms.

While we believe we have been able to operate effectively with most of our employees working remotely, an extended period of remote work arrangements could strain the Company’s business continuity plans, introduce operational risk, including but not limited to cybersecurity risks, and adversely affect the Company’s ability to manage our business.

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SUMMARY OF CRITICAL ACCOUNTING ESTIMATES

Our critical accounting estimates include “Claims and Claim Expense Reserves,” “Premiums and Related Expenses,” “Reinsurance Recoverables,” “Fair Value Measurements and Impairments” and “Income Taxes,” and are discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Form 10-K for the year ended December 31, 2020. There have been no material changes to our critical accounting estimates as disclosed in our Form 10-K for the year ended December 31, 2020.

SUMMARY OF RESULTS OF OPERATIONS

Below is a discussion of the results of operations for the first quarter of 2021, compared to the first quarter of 2020.

Three months ended March 31	2021			2020			Change
(in thousands, except per share amounts and percentages)
Statement of operations highlights
Gross premiums written	$	2,652,442		$	2,025,721		$	626,721
Net premiums written	$	1,824,083		$	1,269,808		$	554,275
Net premiums earned	$	1,153,836		$	913,098		$	240,738
Net claims and claim expenses incurred	867,051			570,954			296,097
Acquisition expenses	267,234			210,604			56,630
Operational expenses	55,311			67,461			(12,150)
Underwriting (loss) income	$	(35,760)		$	64,079		$	(99,839)
Net investment income	$	79,804		$	99,473		$	(19,669)
Net realized and unrealized losses on investments	(345,563)			(110,707)			(234,856)
Total investment result	$	(265,759)		$	(11,234)		$	(254,525)
Net (loss) income	$	(330,495)		$	25,173		$	(355,668)
Net loss attributable to RenaissanceRe common shareholders	$	(290,934)		$	(81,974)		$	(208,960)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted	$	(5.87)		$	(1.89)		$	(3.98)
Dividends per common share	$	0.36		$	0.35		$	0.01
Key ratios
Net claims and claim expense ratio – current accident year	75.9		%	61.0		%	14.9		%
Net claims and claim expense ratio – prior accident years	(0.8)		%	1.5		%	(2.3)		%
Net claims and claim expense ratio – calendar year	75.1		%	62.5		%	12.6		%
Underwriting expense ratio	28.0		%	30.5		%	(2.5)		%
Combined ratio	103.1		%	93.0		%	10.1		%
Return on average common equity - annualized	(17.1)		%	(6.3)		%	(10.8)		%
Book value	March 31, 2021			December 31, 2020			Change
Book value per common share	$	131.15		$	138.46		$	(7.31)
Accumulated dividends per common share	22.44			22.08			0.36
Book value per common share plus accumulated dividends	$	153.59		$	160.54		$	(6.95)
Change in book value per common share plus change in accumulated dividends	(5.0)		%

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Net loss attributable to RenaissanceRe common shareholders was $290.9 million in the first quarter of 2021, compared to net loss attributable to RenaissanceRe common shareholders of $82.0 million in the first quarter of 2020. As a result of our net loss attributable to RenaissanceRe common shareholders in the first quarter of 2021, we generated an annualized return on average common equity of negative 17.1% and our book value per common share decreased from $138.46 at December 31, 2020 to $131.15 at March 31, 2021, a 5.0% decrease, after considering the change in accumulated dividends paid to our common shareholders.

The most significant items affecting our financial performance during the first quarter of 2021, on a comparative basis to the first quarter of 2020, include:

•Impact of Winter Storm Uri - in the first quarter of 2021 we had a net negative impact on net loss attributable to RenaissanceRe common shareholders of $179.8 million resulting from Winter Storm Uri.

•Underwriting Results - we incurred an underwriting loss of $35.8 million and had a combined ratio of 103.1% in the first quarter of 2021, compared to underwriting income of $64.1 million and a combined ratio of 93.0% in the first quarter of 2020. Our underwriting loss in the first quarter of 2021 was comprised of a $41.8 million underwriting loss in our Property segment and $6.0 million underwriting income in our Casualty and Specialty segment. In comparison, our underwriting income in the first quarter of 2020 was comprised of our Property segment, which generated underwriting income of $147.2 million, and our Casualty and Specialty segment, which incurred an underwriting loss of $83.2 million.

Included in our underwriting results in the first quarter of 2021 was the impact of the Winter Storm Uri, which resulted in a net negative impact on the underwriting result of $291.5 million and added 26.9 percentage points to the combined ratio, primarily in the Property segment. In comparison, the first quarter of 2020 was impacted by net claims and claim expenses associated with the COVID-19 pandemic of $103.8 million, which added 21.1 percentage points to the Casualty and Specialty segment combined ratio. The losses primarily represent the cost of claims incurred but not yet reported, with respect to exposures such as event contingency and event-based casualty covers.

•Gross Premiums Written - our gross premiums written increased by $626.7 million, or 30.9%, to $2.7 billion, in the first quarter of 2021, compared to the first quarter of 2020, with an increase of $396.3 million in the Property segment and an increase of $230.4 million in the Casualty and Specialty segment, driven by growth from both new and existing business across a number of our underwriting platforms, rate improvements, and, in our Property segment, reinstatement premiums associated with Winter Storm Uri.

•Investment Results - our total investment result, which includes the sum of net investment income and net realized and unrealized losses on investments, was a loss of $265.8 million in the first quarter of 2021, compared to $11.2 million in the first quarter of 2020, an increase in the loss of $254.5 million. Impacting the investment result were realized and unrealized losses on our fixed maturity and equity investments trading portfolios.

•Net Loss Attributable to Redeemable Noncontrolling Interests - our net loss attributable to redeemable noncontrolling interests was $46.9 million in the first quarter of 2021, compared to net income attributable to redeemable noncontrolling interests of $98.1 million in the first quarter of 2020. The decrease was primarily driven by underwriting losses in DaVinci and Vermeer as a result of Winter Storm Uri, as well as investment losses, and a decrease in Medici net income.

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Net Negative Impact

Net negative impact on underwriting result includes the sum of (1) net claims and claim expenses incurred, (2) assumed and ceded reinstatement premiums earned and (3) earned and lost profit commissions. Net negative impact on net income (loss) available (attributable) to RenaissanceRe common shareholders is the sum of (1) net negative impact on underwriting result and (2) redeemable noncontrolling interest. Our estimates of net negative impact are based on a review of our potential exposures, preliminary discussions with certain counterparties and actuarial modeling techniques. Our actual net negative impact, both individually and in the aggregate, may vary from these estimates, perhaps materially. Changes in these estimates will be recorded in the period in which they occur.

Meaningful uncertainty remains regarding the estimates and the nature and extent of the losses from catastrophe events, driven by the magnitude and recent nature of each event, the geographic areas impacted by the events, 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.

The financial data below provides additional information detailing the net negative impact on our consolidated financial statements in the first quarter of 2021 of the major winter storms in February 2021 which caused widespread damage in the U.S., predominantly in Texas, and are referred to herein as "Winter Storm Uri.”

Three months ended March 31, 2021	Winter Storm Uri
(in thousands)
Net claims and claims expenses incurred	$	(372,894)
Assumed reinstatement premiums earned	91,191
Ceded reinstatement premiums earned	(10,570)
Earned profit commissions	773
Net negative impact on underwriting result	(291,500)
Redeemable noncontrolling interest	111,666
Net negative impact on net loss attributable to RenaissanceRe common shareholders	$	(179,834)

The financial data below provides additional information detailing the net negative impact of Winter Storm Uri on our segment underwriting results and consolidated combined ratio in the first quarter of 2021.

Three months ended March 31, 2021	Winter Storm Uri
(in thousands, except percentages)
Net negative impact on Property segment underwriting result	$	(288,470)
Net negative impact on Casualty and Specialty segment underwriting result	(3,030)
Net negative impact on underwriting result	$	(291,500)
Percentage point impact on consolidated combined ratio	26.9

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Underwriting Results by Segment

Property Segment

Below is a summary of the underwriting results and ratios for our Property segment:

Three months ended March 31	2021			2020			Change
(in thousands, except percentages)
Gross premiums written	$	1,616,819		$	1,220,526		$	396,293
Net premiums written	$	1,008,460		$	674,581		$	333,879
Net premiums earned	$	605,166		$	421,335		$	183,831
Net claims and claim expenses incurred	498,832			144,745			354,087
Acquisition expenses	112,754			85,351			27,403
Operational expenses	35,375			44,007			(8,632)
Underwriting (loss) income	$	(41,795)		$	147,232		$	(189,027)
Net claims and claim expenses incurred – current accident year	$	503,994		$	130,844		$	373,150
Net claims and claim expenses incurred – prior accident years	(5,162)			13,901			(19,063)
Net claims and claim expenses incurred – total	$	498,832		$	144,745		$	354,087
Net claims and claim expense ratio – current accident year	83.3		%	31.1		%	52.2		%
Net claims and claim expense ratio – prior accident years	(0.9)		%	3.3		%	(4.2)		%
Net claims and claim expense ratio – calendar year	82.4		%	34.4		%	48.0		%
Underwriting expense ratio	24.5		%	30.7		%	(6.2)		%
Combined ratio	106.9		%	65.1		%	41.8		%

Property Gross Premiums Written

In the first quarter of 2021, our Property segment gross premiums written increased by $396.3 million, or 32.5%, to $1.6 billion, compared to $1.2 billion in the first quarter of 2020.

Gross premiums written in the catastrophe class of business were $1.1 billion in the first quarter of 2021, an increase of $194.9 million, or 20.8% compared to the first quarter of 2020. The increase in gross premiums written in the catastrophe class of business was primarily driven by $90.1 million of reinstatement premiums associated with Winter Storm Uri, in addition to rate improvements which contributed to growth with existing clients and new opportunities across underwriting platforms.

Gross premiums written in the other property class of business were $485.7 million in the first quarter of 2021, an increase of $201.4 million, or 70.8%, compared to the first quarter of 2020. The increase in gross premiums written in the other property class of business was primarily driven by rate improvements which contributed to growth in new and existing business written in the current and prior periods across underwriting platforms.

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Property Ceded Premiums Written

Three months ended March 31	2021		2020		Change
(in thousands)
Ceded premiums written - Property	$	608,359	$	545,945	$	62,414

Ceded premiums written in our Property segment increased $62.4 million, to $608.4 million, in the first quarter of 2021, compared to $545.9 million in the first quarter of 2020. The increase in ceded premiums written was principally due to an increase in gross premiums written which were ceded to third-party investors in our managed vehicles, primarily RenaissanceRe Upsilon Fund Ltd. (“Upsilon Fund”), and $10.6 million of ceded reinstatement premiums earned associated with Winter Storm Uri. As part of our gross-to-net strategy, the amount of ceded premiums written increased on an absolute basis, however the percentage of ceded premiums written relative to gross premiums written decreased.

Property Underwriting Results

Our Property segment incurred an underwriting loss of $41.8 million in the first quarter of 2021, compared to underwriting income of $147.2 million in the first quarter of 2020, a decrease of $189.0 million. In the first quarter of 2021, our Property segment generated a net claims and claim expense ratio of 82.4%, an underwriting expense ratio of 24.5% and a combined ratio of 106.9%, compared to 34.4%, 30.7% and 65.1%, respectively, in the first quarter of 2020.

Principally impacting the Property segment underwriting result and combined ratio in the first quarter of 2021 was Winter Storm Uri, which resulted in a net negative impact on the Property segment underwriting result of $288.5 million and added 53.9 percentage points to the combined ratio. In comparison, the first quarter of 2020 was impacted by attritional losses associated with the other property class of business, as well as a number of small insured catastrophe events, resulting in a lower current accident year net claims and claim expense ratio in the first quarter of 2020, compared to the first quarter of 2021. In addition, the underwriting expense ratio decreased by 6.2 percentage points primarily driven by lower operating expenses in the current period due to reduced travel, marketing, and office operational expenses as a result of the COVID-19 pandemic, combined with higher net premiums earned including $79.7 million of net reinstatement premiums earned from Winter Storm Uri.

See “Note 6. Reserve for Claims and Claim Expenses” in our “Notes to the Consolidated Financial Statements” for additional information related to the development of prior accident years net claims and claim expenses.

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Casualty and Specialty Segment

Below is a summary of the underwriting results and ratios for our Casualty and Specialty segment:

Three months ended March 31	2021			2020			Change
(in thousands, except percentages)
Gross premiums written	$	1,035,623		$	805,195		$	230,428
Net premiums written	$	815,623		$	595,227		$	220,396
Net premiums earned	$	548,670		$	491,763		$	56,907
Net claims and claim expenses incurred	368,219			426,209			(57,990)
Acquisition expenses	154,480			125,253			29,227
Operational expenses	19,936			23,454			(3,518)
Underwriting income (loss)	$	6,035		$	(83,153)		$	89,188
Net claims and claim expenses incurred – current accident year	$	372,089		$	426,210		$	(54,121)
Net claims and claim expenses incurred – prior accident years	(3,870)			(1)			(3,869)
Net claims and claim expenses incurred – total	$	368,219		$	426,209		$	(57,990)
Net claims and claim expense ratio – current accident year	67.8		%	86.7		%	(18.9)		%
Net claims and claim expense ratio – prior accident years	(0.7)		%	—		%	(0.7)		%
Net claims and claim expense ratio – calendar year	67.1		%	86.7		%	(19.6)		%
Underwriting expense ratio	31.8		%	30.2		%	1.6		%
Combined ratio	98.9		%	116.9		%	(18.0)		%

Casualty and Specialty Gross Premiums Written

In the first quarter of 2021, our Casualty and Specialty segment gross premiums written increased by $230.4 million, or 28.6%, to $1.0 billion, compared to $805.2 million in the first quarter of 2020. The increase was primarily due to growth in new and existing casualty business written in the current and prior periods, and rate improvements.

Casualty and Specialty Ceded Premiums Written

Three months ended March 31	2021		2020		Change
(in thousands)
Ceded premiums written - Casualty and Specialty	$	220,000	$	209,968	$	10,032

Ceded premiums written in our Casualty and Specialty segment increased by $10.0 million, to $220.0 million, in the first quarter of 2021, compared to $210.0 million in the first quarter of 2020, primarily resulting from increased gross premiums written subject to our retrocessional quota share reinsurance programs, partially offset by a decrease in retrocessional purchases.

Casualty and Specialty Underwriting Results

Our Casualty and Specialty segment generated underwriting income of $6.0 million in the first quarter of 2021, compared to an underwriting loss of $83.2 million in the first quarter of 2020. In the first quarter of 2021, our Casualty and Specialty segment generated a net claims and claim expense ratio of 67.1%, an underwriting expense ratio of 31.8% and a combined ratio of 98.9%, compared to 86.7%, 30.2% and 116.9%, respectively, in the first quarter of 2020. The underwriting loss in the first quarter of 2020 was principally driven by net claims and claim expenses associated with the COVID-19 pandemic of $103.8 million, which added 21.1 percentage points to the combined ratio during the first quarter of 2020.

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The decrease in the Casualty and Specialty segment combined ratio in the first quarter of 2021 was principally driven by a decrease of 19.6 percentage points in the net claims and claim expense ratio, as a result of the impact of losses associated with the COVID-19 pandemic in the prior period. Additionally, our Casualty and Specialty segment experienced net favorable development on prior accident years net claims and claim expenses of $3.9 million, or 0.7 percentage points, during the first quarter of 2021. The net favorable development during the first quarter of 2021 was driven by reported losses generally coming in lower than expected on attritional net claims and claim expenses. See “Note 6. Reserve for Claims and Claim Expenses” in our “Notes to the Consolidated Financial Statements” for additional information related to the development of prior accident years net claims and claim expenses.

The underwriting expense ratio in the Casualty and Specialty segment increased 1.6 percentage points principally due to the effects of purchase accounting amortization related to the acquisition of TMR which decreased the acquisition ratio in the first quarter of 2020. This was partially offset by improved operating leverage in the first quarter of 2021.

Fee Income

Three months ended March 31	2021		2020		Change
(in thousands)
Management fee income
Joint ventures	$	11,128	$	11,781	$	(653)
Structured reinsurance products and other	8,774		8,597		177
Managed funds	8,622		6,418		2,204
Total management fee income	28,524		26,796		1,728
Performance fee income
Joint ventures	1,556		7,828		(6,272)
Structured reinsurance products and other	(1,293)		8,375		(9,668)
Managed funds	(4,798)		2,363		(7,161)
Total performance fee (loss) income	(4,535)		18,566		(23,101)
Total fee income	$	23,989	$	45,362	$	(21,373)

The table above shows total fee income earned through third-party capital management, as well as various joint ventures, managed funds and certain structured retrocession agreements to which we are a party. Performance fees are based on the performance of the individual vehicles or products, and may be zero or negative in a particular period if, for example, large losses occur, which can potentially result in no performance fees or the reversal of previously accrued performance fees. Joint ventures include DaVinciRe, Top Layer Re, Vermeer and certain entities investing in Langhorne Holdings LLC. Managed funds include Upsilon Fund and Medici. Structured reinsurance products and other includes certain other vehicles and reinsurance contracts which transfer risk to capital. The fees earned through third-party capital management are principally recorded through redeemable noncontrolling interest, or as a reduction to operating expenses and acquisition expenses, as applicable.

In the first quarter of 2021, total fee income earned through various joint ventures, managed funds and certain structured retrocession agreements to which we are a party decreased $21.4 million, to $24.0 million, compared to $45.4 million in the first quarter of 2020, primarily driven by lower performance fee income due to the impact of Winter Storm Uri on our joint ventures, managed funds and structured reinsurance agreements. Partially offsetting this was higher management fees related to an increase in the dollar value of capital under management. Of the $24.0 million in total fee income earned in the first quarter of 2021 through various joint ventures, managed funds and certain structured retrocession agreements to which we are a party, $13.4 million was recorded through redeemable noncontrolling interest and $10.5 million was recorded through underwriting income as a reduction to operating expenses and acquisition expenses (2020 - $26.9 million and $18.4 million, respectively).

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In addition to the $10.5 million of fee income earned through joint ventures, managed funds and certain structured retrocession agreements to which we are a party that is recorded through underwriting income, as detailed above, we also earn fee income on certain other underwriting-related activities. These fees, in the aggregate, are recorded as a reduction (increase) to operating expenses or acquisition expenses, as applicable. The total fees, including the $10.5 million of fee income detailed in the table above plus other fee income we earn on certain other underwriting activities, earned by us in the first quarter of 2021 that were recorded as a reduction (increase) to operating expenses or acquisition expenses were $30.8 million and $(5.6) million, respectively, resulting in a reduction to the combined ratio of 2.2% (2020 - $26.3 million, $3.6 million and 3.3%, respectively).

Net Investment Income

Three months ended March 31	2021		2020		Change
(in thousands)
Fixed maturity investments trading	$	62,933	$	73,338	$	(10,405)
Short term investments	573		12,092		(11,519)
Equity investments trading	1,491		1,551		(60)
Other investments
Catastrophe bonds	14,468		14,139		329
Other	3,801		1,629		2,172
Cash and cash equivalents	102		1,504		(1,402)
	83,368		104,253		(20,885)
Investment expenses	(3,564)		(4,780)		1,216
Net investment income	$	79,804	$	99,473	$	(19,669)

Net investment income was $79.8 million in the first quarter of 2021, compared to $99.5 million in the first quarter of 2020, a decrease of $19.7 million. Impacting our net investment income for the first quarter of 2021 were lower returns in our fixed maturity and short term investment portfolios, primarily as a result of lower yields on these investments following the decline in interest rates in early 2020 at the onset of the COVID-19 pandemic.

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Net Realized and Unrealized Losses on Investments

Three months ended March 31	2021		2020		Change
(in thousands)
Net realized gains on fixed maturity investments trading	$	20,398	$	57,487	$	(37,089)
Net unrealized losses on fixed maturity investments trading	(297,018)		(20,345)		(276,673)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)		37,142		(313,762)
Net realized and unrealized gains on investments-related derivatives	14,861		33,181		(18,320)
Net realized gains (losses) on equity investments trading	109,887		(15,047)		124,934
Net unrealized losses on equity investments trading	(177,809)		(105,937)		(71,872)
Net realized and unrealized losses on equity investments trading	(67,922)		(120,984)		53,062
Net realized and unrealized losses on other investments - catastrophe bonds	(19,083)		(14,352)		(4,731)
Net realized and unrealized gains (losses) on other investments - other	3,201		(45,694)		48,895
Net realized and unrealized losses on investments	$	(345,563)	$	(110,707)	$	(234,856)

Our investment portfolio strategy is structured to emphasize the preservation of capital and the availability of liquidity to meet our claims obligations and to be well diversified across market sectors. A large majority of our investments are invested in the fixed income markets and, therefore, our net realized and unrealized gains and losses on investments are highly correlated to fluctuations in interest rates and credit spreads. Therefore, everything else being constant, as interest rates or credit spreads decline, we will tend to have realized and unrealized gains from our fixed maturity investments portfolio, and as interest rates and credit spreads rise, we will tend to have realized and unrealized losses from our fixed maturity investments portfolio.

Net realized and unrealized losses on investments were $345.6 million in the first quarter of 2021, compared to net realized and unrealized losses of $110.7 million in the first quarter of 2020, an increase in net realized and unrealized losses of $234.9 million. Principally impacting our net realized and unrealized losses on investments in the first quarter of 2021 were:

•net realized and unrealized losses on our fixed maturity investments trading of $276.6 million compared to net realized and unrealized gains of $37.1 million in the first quarter of 2020, an increase in net realized and unrealized losses of $313.8 million, principally driven by increasing yields on U.S. treasuries during the first quarter of 2021;

•net realized and unrealized losses on equity investments trading of $67.9 million compared to $121.0 million in the first quarter of 2020, a decrease in net realized and unrealized losses of $53.1 million. The net realized and unrealized losses in the first quarter of 2021 were principally driven by the Company’s strategic investment in Trupanion, Inc., where we recorded a net change in realized and unrealized losses pertaining to this investment totaling $90.8 million, which includes $109.7 million of net realized gain from the partial sale of this investment; and

•net realized and unrealized gains on our other investments of $3.2 million compared to net realized and unrealized losses of $45.7 million in the first quarter of 2020, an improvement of $48.9 million, principally driven by higher returns in our private equity investment portfolio.

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Net Foreign Exchange Losses

Three months ended March 31	2021		2020		Change
(in thousands)
Net foreign exchange losses	$	(22,788)	$	(5,728)	$	(17,060)

Our functional currency is the U.S. dollar. We routinely write a portion of our business in currencies other than U.S. dollars and invest a portion of our cash and investment portfolio in those currencies. Certain of our subsidiaries use non-U.S. dollar functional currencies. As a result, we may experience foreign exchange gains and losses in our consolidated financial statements. We are primarily impacted by foreign currency exposures associated with our underwriting operations, investment portfolio, and operations with non-U.S. dollar functional currencies, and may, from time to time, enter into 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.

Equity in (Losses) Earnings of Other Ventures

Three months ended March 31	2021		2020		Change
(in thousands)
Tower Hill Companies	$	(9,812)	$	409	$	(10,221)
Top Layer Re	2,145		2,406		(261)
Other	2,109		1,749		360
Total equity in (losses) earnings of other ventures	$	(5,558)	$	4,564	$	(10,122)

Losses from our investments in other ventures was $5.6 million in the first quarter of 2021, compared to earnings of $4.6 million in the first quarter of 2020, a decrease of $10.1 million, principally driven by reduced profitability of our equity investments in the Tower Hill Companies.

Other Income (Loss)

Three months ended March 31	2021		2020		Change
(in thousands)
Assumed and ceded reinsurance contracts accounted for as derivatives and deposits	$	2,136	$	(5,007)	7,143
Other	35		571		(536)
Total other income (loss)	$	2,171	$	(4,436)	$	6,607

In the first quarter of 2021, we generated other income of $2.2 million, compared to an other loss of $4.4 million in the first quarter of 2020, an increase of $6.6 million, driven by gains on our assumed and ceded reinsurance contracts accounted for as derivatives and deposits.

Corporate Expenses

Three months ended March 31	2021		2020		Change
(in thousands)
Corporate expenses	$	10,405	$	15,991	$	(5,586)

Corporate expenses include certain executive, director, legal and consulting expenses, costs for research and development, impairment charges related to goodwill and other intangible assets, and other miscellaneous costs, including those associated with operating as a publicly traded company, as well as costs associated with the acquisition of TMR, primarily in the first quarter of 2020.

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Corporate expenses decreased $5.6 million to $10.4 million, in the first quarter of 2021, compared to $16.0 million in the first quarter of 2020. The decrease of $5.6 million was primarily due to certain TMR-related integration and compensation related costs that were incurred in the first quarter of 2020.

Income Tax Benefit

Three months ended March 31	2021		2020		Change
(in thousands)
Income tax benefit	$	19,516	$	8,846	$	10,670

In the first quarter of 2021, we recognized an income tax benefit of $19.5 million, compared to $8.8 million in the first quarter of 2020. The income tax benefit in the first quarter of 2021 was principally driven by unrealized investment losses in the Company’s taxable jurisdictions.

Net Loss (Income) Attributable to Redeemable Noncontrolling Interests

Three months ended March 31	2021		2020		Change
(in thousands)
Net loss (income) attributable to redeemable noncontrolling interests	$	46,850	$	(98,091)	$	144,941

Our net loss attributable to redeemable noncontrolling interests was $46.9 million, a decrease of $144.9 million compared to the first quarter of 2020. The decrease was primarily driven by losses in DaVinci and Vermeer as a result of Winter Storm Uri, as well as investment losses, and a decrease in Medici net income.

FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES

Financial Condition

As a Bermuda-domiciled holding company, RenaissanceRe has limited operations of its own. Its assets consist primarily of investments in subsidiaries and cash and securities in amounts which fluctuate over time. We therefore rely on dividends and distributions (and other statutorily permissible payments) from our subsidiaries, investment income and fee income to meet our liquidity requirements, which primarily include making principal and interest payments on our debt and dividend payments to our preference and common shareholders.

The payment of dividends by our subsidiaries is, under certain circumstances, limited by the applicable laws and regulations in the various jurisdictions in which our subsidiaries operate, including Bermuda, the U.S., the U.K., Switzerland, Australia, Singapore and Ireland. In addition, insurance laws require our insurance subsidiaries to maintain certain measures of solvency and liquidity. We believe that each of our insurance subsidiaries and branches exceeded the minimum solvency, capital and surplus requirements in their applicable jurisdictions at March 31, 2021. Certain of our subsidiaries and branches are required to file financial condition reports (“FCRs”) with their regulators, which provide details on solvency and financial performance. Where required, these FCRs will be posted on our website. The regulations governing our and our principal operating subsidiaries’ ability to pay dividends and to maintain certain measures of solvency and liquidity, and requirements to file FCRs are discussed in detail in “Part I, Item 1. Business, Regulation” and “Note 18. Statutory Requirements” in our “Notes to the Consolidated Financial Statements” in our Form 10-K for the year ended December 31, 2020.

Liquidity and Cash Flows

Holding Company Liquidity

RenaissanceRe’s principal uses of liquidity are: (1) common share related transactions including dividend payments to our common shareholders and common share repurchases, (2) preference share related transactions including dividend payments to our preference shareholders and preference share redemptions, (3) interest and principal payments on debt, (4) capital investments in our subsidiaries, (5)

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acquisition of new or existing companies or businesses, such as our acquisition of TMR and (6) certain corporate and operating expenses.

We attempt to structure our organization in a way that facilitates efficient capital movements between RenaissanceRe and our operating subsidiaries and to ensure that adequate liquidity is available when required, giving consideration to applicable laws and regulations, and the domiciliary location of sources of liquidity and related obligations. For example, our internal investment structures and a cash pooling arrangement among the Company and certain of our subsidiaries help to efficiently facilitate capital and liquidity movements.

In the aggregate, our principal operating subsidiaries have historically produced sufficient cash flows to meet their expected claims payments and operational expenses and to provide dividend payments to us. In addition, our subsidiaries maintain a concentration of investments in high quality liquid securities, which management believes will provide additional liquidity for extraordinary claims payments should the need arise. However, in some circumstances, RenaissanceRe may contribute capital to its subsidiaries. For example, during 2019, RenaissanceRe contributed capital to RenaissanceRe Specialty Holdings (UK) Limited to fund the acquisition of TMR and made a capital contribution to Renaissance Reinsurance to increase its shareholders’ equity, consistent with past practice following a significant acquisition and to support growth in premiums, and in 2020, RenaissanceRe contributed capital to RREAG to support additional growth in our European business. In addition, from time to time we invest in new managed joint ventures or managed funds, increase our investments in certain of our managed joint ventures or managed funds and contribute cash to investment subsidiaries. In certain instances, we are required to make capital contributions to our subsidiaries, for example, Renaissance Reinsurance is obligated to make a mandatory capital contribution of up to $50.0 million in the event that a loss reduces Top Layer Re’s capital below a specified level.

Sources of Liquidity

Historically, cash receipts from operations, consisting primarily of premiums, investment income and fee income, have provided sufficient funds to pay the losses and operating expenses incurred by our subsidiaries and to fund dividends and distributions to RenaissanceRe. Other potential sources of liquidity include borrowings under our credit facilities and issuances of securities.

The premiums received by our operating subsidiaries are generally received months or even years before losses are paid under the policies related to such premiums. Premiums and acquisition expenses generally are received within the first two years of inception of a contract, while operating expenses are generally paid within a year of being incurred. It generally takes much longer for net claims and claims expenses incurred to be reported and ultimately settled, requiring the establishment of reserves for claims and claim expenses and losses recoverable. Therefore, the amount of net claims paid in any one year is not necessarily related to the amount of net claims and claims expenses incurred in that year, as reported in the consolidated statement of operations.

While we expect that our liquidity needs will continue to be met by our cash receipts from operations, as a result of the combination of current market conditions, lower than usual investment yields, and the nature of our business where a large portion of the coverages we provide can produce losses of high severity and low frequency, future cash flows from operating activities cannot be accurately predicted and may fluctuate significantly between individual quarters and years. In addition, due to the magnitude and complexity of certain large loss events, meaningful uncertainty remains regarding losses from these events and our actual ultimate net losses from these events may vary materially from preliminary estimates, which would impact our cash flows from operations. Further, we expect historically significant industry losses related to the COVID-19 pandemic to emerge over time as the full impact of the pandemic and its effects on the global economy are realized, which may impact our cash flows from operations.

Our “shelf” registration statement on Form S-3 under the Securities Act allows for the public offering of various types of securities, including common shares, preference shares and debt securities, and thus provides a source of liquidity. Because we are a “well-known seasoned issuer” as defined by the rules promulgated under the Securities Act, we are also eligible to file additional automatically effective registration statements on Form S-3 in the future for the potential offering and sale of additional debt and equity securities.

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Credit Facilities

In addition, we, and certain of our subsidiaries, joint ventures and managed funds, maintain credit facilities that provide liquidity and allow us to satisfy certain collateral requirements. The outstanding amounts drawn under each of our significant credit facilities are set forth below:

At March 31, 2021	Issued or Drawn
Revolving Credit Facility (1)	$	—
Bilateral Letter of Credit Facilities
Secured	392,116
Unsecured	488,532
Funds at Lloyd’s Letter of Credit Facility	225,000
	$	1,105,648

(1)     At March 31, 2021, no amounts were issued or drawn under this facility.

There have been no material changes to our credit facilities as disclosed in our Form 10-K for the year ended December 31, 2020.

Refer to “Note 7. Debt and Credit Facilities” in our “Notes to the Consolidated Financial Statements” for additional information related to our significant debt and credit facilities.

Funds at Lloyd’s

As a member of Lloyd’s, the underwriting capacity, or stamp capacity, of Syndicate 1458 must be supported by providing a deposit, the FAL, in the form of cash, securities or letters of credit. At March 31, 2021, the FAL required to support the underwriting activities at Lloyd’s through Syndicate 1458 was £696.2 million (December 31, 2020 - £696.2 million). Actual FAL posted for Syndicate 1458 at March 31, 2021 by RenaissanceRe Corporate Capital (UK) Limited was $862.7 million (December 31, 2020 - $874.2 million), supported by a $225.0 million letter of credit and a $637.7 million deposit of cash and fixed maturity securities (December 31, 2020 - $225.0 million and $649.2 million, respectively).

Multi-Beneficiary Reinsurance Trusts, Multi-Beneficiary Reduced Collateral Reinsurance Trusts and Other Collateral Arrangements

Certain of our insurance subsidiaries use multi-beneficiary reinsurance trusts and multi-beneficiary reduced collateral reinsurance trusts to collateralize reinsurance liabilities. From time to time, we also use other types of collateral arrangements. Refer to “Note 18. Statutory Requirements” in our “Notes to the Consolidated Financial Statements” in our Form 10-K for the year ended December 31, 2020 for additional information on our multi-beneficiary reinsurance trusts.

Multi-Beneficiary Reinsurance Trusts

Assets held under trust at March 31, 2021 with respect to our multi-beneficiary reinsurance trusts totaled $1.2 billion and $269.0 million for Renaissance Reinsurance and DaVinci, respectively (December 31, 2020 - $1.3 billion and $289.6 million, respectively), compared to the minimum amount required under U.S. state regulations of $658.9 million and $228.1 million, respectively, at March 31, 2021 (December 31, 2020 - $878.2 million and $270.5 million, respectively).

Multi-Beneficiary Reduced Collateral Reinsurance Trusts

Assets held under trust at March 31, 2021 with respect to our multi-beneficiary reduced collateral reinsurance trusts totaled $122.2 million and $129.2 million for Renaissance Reinsurance and DaVinci, respectively (December 31, 2020 - $74.4 million and $90.1 million, respectively), compared to the minimum amount required under U.S. state regulations of $116.4 million and $121.2 million, respectively (December 31, 2020 - $70.0 million and $86.5 million, respectively).

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Cash Flows

Three months ended March 31	2021		2020
(in thousands)
Net cash provided by operating activities	$	206,538	$	475,466
Net cash used in investing activities	(463,131)		(530,282)
Net cash used in financing activities	(193,579)		(429,617)
Effect of exchange rate changes on foreign currency cash	20		1,581
Net decrease in cash and cash equivalents	(450,152)		(482,852)
Cash and cash equivalents, beginning of period	1,736,813		1,379,068
Cash and cash equivalents, end of period	$	1,286,661	$	896,216

2021

During the three months ended March 31, 2021, our cash and cash equivalents decreased by $450.2 million, to $1.3 billion at March 31, 2021, compared to $1.7 billion at December 31, 2020.

Cash flows provided by operating activities. Cash flows provided by operating activities during the three months ended March 31, 2021 were $206.5 million, compared to $475.5 million during the three months ended March 31, 2020. Cash flows provided by operating activities during the three months ended March 31, 2021 were primarily the result of certain adjustments to reconcile our net loss of $330.5 million to net cash provided by operating activities, including:

•an increase in unearned premiums of $1.1 billion due to the growth in gross premiums written across both our Property and Casualty and Specialty segments;

•an increase in reinsurance balances payable of $766.3 million principally driven by the issuance of non-voting preference shares to investors in Upsilon RFO, which are accounted for as prospective reinsurance and included in reinsurance balances payable on our consolidated balance sheet. See “Note 9. Variable Interest Entities” in our “Notes to the Consolidated Financial Statements” for additional information related to Upsilon RFO’s non-voting preference shares;

•an increase in reserve for claims and claim expenses of $572.2 million primarily the result of net claims and claim expenses associated with Winter Storm Uri;

•net realized and unrealized losses on investments of $360.4 million principally driven by net unrealized losses on fixed maturity investments and equity investments trading, partially offset by net realized gains in equity investments trading, primarily in the strategic investment portfolio; partially offset by

•an increase in premiums receivable of $1.0 billion due to the timing of receipts and increase in our gross premiums written;

•an increase of $406.1 million in our prepaid reinsurance premiums due to the timing of payments and increase in ceded premiums written; and

•a decrease in other operating cash flows of $423.4 million primarily reflecting subscriptions received in advance of the issuance of Upsilon RFO’s non-voting preference shares effective January 1, 2021, which were recorded in other liabilities at December 31, 2020. During the three months ended March 31, 2021, in connection with the issuance of the non-voting preference shares of Upsilon RFO, other liabilities were reduced by the subscriptions received in advance, 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, as noted above, on our consolidated statements of cash flows for the three months ended March 31, 2021. See “Note 9. Variable Interest Entities” in our “Notes to the Consolidated Financial Statements” for additional information related to Upsilon RFO’s non-voting preference shares.

Cash flows used in investing activities. During the three months ended March 31, 2021, our cash flows used in investing activities were $463.1 million, principally reflecting net purchases of fixed maturity investments

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trading, short term investments and other investments of $339.5 million, $111.1 million and $127.7 million, respectively, partially offset by net sales of equity investments trading of $128.0 million. The net purchase of fixed maturity investments trading was primarily funded by cash flows provided by operating activities, as described above, whereas the net purchase of short term investments was primarily associated with capital received from investors in Upsilon RFO during the three months ended March 31, 2021. The net purchase of other investments during the three months ended March 31, 2021, was primarily driven by an increased allocation to catastrophe bonds.

Cash flows used in financing activities. Our cash flows used in financing activities in the three months ended March 31, 2021 were $193.6 million, and were principally the result of:

•the repurchase of 1.1 million of our common shares in open market transactions at an aggregate cost of $171.6 million and an average price of $159.47 per common share;

•dividends paid on our common and preference shares of $17.8 million and $7.3 million, respectively; partially offset by

•net inflows of $13.0 million primarily related to net third-party redeemable noncontrolling interest share transactions in Medici and DaVinci.

2020

During the three months ended March 31, 2020, our cash and cash equivalents decreased by $482.9 million, to $896.2 million at March 31, 2020, compared to $1.4 billion at December 31, 2019.

Cash flows provided by operating activities. Cash flows provided by operating activities during the three months ended March 31, 2020 were $475.5 million, compared to $377.1 million during the three months ended March 31, 2019. Cash flows provided by operating activities during the three months ended March 31, 2020 were primarily the result of certain adjustments to reconcile our net income of $25.2 million to net cash provided by operating activities, including:

•an increase in reinsurance balances payable of $944.7 million principally driven by the issuance of non-voting preference shares to investors in Upsilon RFO, which are accounted for as prospective reinsurance and included in reinsurance balances payable on our consolidated balance sheet. See “Note 9. Variable Interest Entities” in our “Notes to the Consolidated Financial Statements” for additional information related to Upsilon RFO’s non-voting preference shares;

•an increase in unearned premiums of $714.9 million due to the growth in gross premiums written across both our Property and Casualty and Specialty segments;

•net realized and unrealized losses on investments of $110.7 million principally due to negative performances from our equity investments trading and other investments, due in part to the recent disruption in global financial markets associated with the COVID-19 pandemic; partially offset by

•increase in premiums receivable of $505.5 million due to the timing of receipts and increase in our gross premiums written;

•an increase of $384.1 million in our prepaid reinsurance premiums due to the timing of payments and increase in ceded premiums written; and

•a decrease in other operating cash flows of $405.5 million primarily reflecting subscriptions received in advance of the issuance of Upsilon RFO’s non-voting preference shares effective January 1, 2020, which were recorded in other liabilities at December 31, 2019. During the three months ended March 31, 2020, in connection with the issuance of the non-voting preference shares of Upsilon RFO, other liabilities were reduced by the subscriptions received in advance, 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, as noted above, on our consolidated statements of cash flows for the three months ended March 31, 2020. See “Note 9. Variable Interest Entities” in our “Notes to the Consolidated Financial Statements” for additional information related to Upsilon RFO’s non-voting preference shares.

Cash flows used in investing activities. During the three months ended March 31, 2020, our cash flows used in investing activities were $530.3 million, principally reflecting net purchases of short term investments,

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other investments and equity investments trading of $704.2 million, $79.7 million and $44.5 million, respectively. Partially offsetting these net purchases was proceeds from net sales and maturities of fixed maturity investments trading of $290.9 million, which, along with cash flows provided by operating activities, were primarily used to fund our cash flows used in financing activities as described below. The net purchase of short term investments was funded in part by the capital received from investors in Upsilon RFO, and other net cash flows provided by operating activities. The net purchase of other investments during the three months ended March 31, 2020, was primarily driven by an increased allocation to catastrophe bonds.

Cash flows provided by financing activities. Our cash flows used in financing activities in the three months ended March 31, 2020 were $429.6 million, and were principally the result of:

•the repayment in full at maturity the aggregate principal amount of $250.0 million, plus applicable accrued interest, of our 5.75% Senior Notes due 2020 of RenRe North America Holdings Inc. and RenaissanceRe Finance;

•the redemption of all 5 million of our outstanding Series C 6.08% Preference Shares on March 26, 2020 for $125.0 million plus accrued and unpaid dividends thereon;

•the repurchase of 406 thousand of our common shares in open market transactions at an aggregate cost of $62.6 million and an average price of $154.36 per common share;

•dividends paid on our common and preference shares of $15.4 million and $9.1 million, respectively; partially offset by

•net inflows of $42.6 million primarily related to net third party redeemable noncontrolling interest share transactions in DaVinciRe and Medici.

Capital Resources

We monitor our capital adequacy on a regular basis and seek to adjust our capital according to the needs of our business. In particular, we require capital sufficient to meet or exceed the capital adequacy ratios established by rating agencies for maintenance of appropriate financial strength ratings, the capital adequacy tests performed by regulatory authorities and the capital requirements under our credit facilities. We may seek to raise additional capital or return capital to our shareholders through common share repurchases and cash dividends (or a combination of such methods). In the normal course of our operations, we may from time to time evaluate additional share or debt issuances given prevailing market conditions and capital management strategies, including for our operating subsidiaries, joint ventures and managed funds. In addition, as noted above, we enter into agreements with financial institutions to obtain letter of credit facilities for the benefit of our operating subsidiaries and certain of our joint ventures and managed funds in their reinsurance and insurance business.

Our total shareholders’ equity attributable to RenaissanceRe and debt was as follows:

	At March 31, 2021		At December 31, 2020		Change
(in thousands)
Common shareholders’ equity	$	6,553,337	$	7,035,248	$	(481,911)
Preference shares	525,000		525,000		—
Total shareholders’ equity attributable to RenaissanceRe	7,078,337		7,560,248		(481,911)
3.600% Senior Notes due 2029	392,619		392,391		228
3.450% Senior Notes due 2027	296,909		296,787		122
3.700% Senior Notes due 2025	298,519		298,428		91
4.750% Senior Notes due 2025 (DaVinciRe) (1)	148,736		148,659		77
Total debt	$	1,136,783	$	1,136,265	$	518
Total shareholders’ equity attributable to RenaissanceRe and debt	$	8,215,120	$	8,696,513	$	(481,393)

(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

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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.

During the three months ended March 31, 2021, our total shareholders’ equity attributable to RenaissanceRe and debt decreased by $0.5 billion, to $8.2 billion.

Our shareholders’ equity attributable to RenaissanceRe decreased $0.5 billion during the three months ended March 31, 2021 principally as a result of:

•our comprehensive loss attributable to RenaissanceRe of $283.4 million;

•the repurchase of 1.1 million common shares in open market transactions at an aggregate cost of $171.6 million and an average price of $159.47 per common share; and

•$17.8 million and $7.3 million of dividends on our common and preference shares, respectively.

Our debt increased $0.5 million during the three months ended March 31, 2021.

For additional information related to the terms of our debt and significant credit facilities, see “Note 7. Debt and Credit Facilities” in our “Notes to the Consolidated Financial Statements” in this Form 10-Q and “Note 9. Debt and Credit Facilities” in our “Notes to the Consolidated Financial Statements” in our Form 10-K for the year ended December 31, 2020. See “Note 10. Shareholders’ Equity” in our “Notes to the Consolidated Financial Statements” in this Form 10-Q and “Note 12. Shareholders’ Equity” in our “Notes to the Consolidated Financial Statements” in our Form 10-K for the year ended December 31, 2020 for additional information related to our common and preference shares.

Reserve for Claims and Claim Expenses

We believe the most significant accounting judgment made by management is our 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 we sell. Our actual net claims and claim expenses paid will differ, perhaps materially, from the estimates reflected in our financial statements, which may adversely impact our financial condition, liquidity and capital resources.

Refer to “Note 8. Reserve for Claims and Claim Expenses” in our “Notes to the Consolidated Financial Statements” in our Form 10-K for the year ended December 31, 2020 and “Note 6. Reserve for Claims and Claim Expenses” included herein for more information on the risks we insure and reinsure, the reserving techniques, assumptions and processes we follow to estimate our claims and claim expense reserves, prior year development of the reserve for claims and claim expenses, analysis of our incurred and paid claims development and claims duration information for each of our Property and Casualty and Specialty segments. In addition, refer to “Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Summary of Critical Accounting Estimates, Claims and Claim Expense Reserves” in our Form 10-K for the year ended December 31, 2020 for more information on the reserving techniques, assumptions and processes we follow to estimate our claims and claim expense reserves, our current estimates versus our initial estimates of our claims reserves, and sensitivity analysis for each of our Property and Casualty and Specialty segments.

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Investments

The table below shows our invested assets:

	March 31, 2021				December 31, 2020				Change
(in thousands, except percentages)
U.S. treasuries	$	5,107,878	25.1	%	$	4,960,409	24.1	%	$	147,469
Agencies	227,184		1.1	%	368,032		1.8	%	(140,848)
Non-U.S. government	518,162		2.5	%	491,531		2.4	%	26,631
Non-U.S. government-backed corporate	335,662		1.6	%	338,014		1.6	%	(2,352)
Corporate	4,289,072		21.1	%	4,261,025		20.7	%	28,047
Agency mortgage-backed	957,563		4.7	%	1,113,792		5.4	%	(156,229)
Non-agency mortgage-backed	272,529		1.3	%	291,444		1.4	%	(18,915)
Commercial mortgage-backed	713,044		3.5	%	791,272		3.8	%	(78,228)
Asset-backed	888,140		4.4	%	890,984		4.3	%	(2,844)
Total fixed maturity investments, at fair value	13,309,234		65.3	%	13,506,503		65.5	%	(197,269)
Short term investments, at fair value	5,091,143		25.0	%	4,993,735		24.3	%	97,408
Equity investments trading, at fair value	503,137		2.5	%	702,617		3.4	%	(199,480)
Other investments, at fair value	1,379,056		6.8	%	1,256,948		6.2	%	122,108
Total managed investment portfolio	20,282,570		99.6	%	20,459,803		99.4	%	(177,233)
Investments in other ventures, under equity method	91,362		0.4	%	98,373		0.6	%	(7,011)
Total investments	$	20,373,932	100.0	%	$	20,558,176	100.0	%	$	(184,244)

At March 31, 2021, we held investments totaling $20.4 billion, compared to $20.6 billion at December 31, 2020. Our investment guidelines stress preservation of capital, market liquidity, and diversification of risk. Notwithstanding the foregoing, our investments are subject to market-wide risks and fluctuations, as well as to risks inherent in particular securities. In addition to the information presented above and below, see “Note 3. Investments” and “Note 4. Fair Value Measurements” in our “Notes to the Consolidated Financial Statements” for additional information regarding our investments and the fair value measurement of our investments, respectively.

As the reinsurance coverages we sell include substantial protection for damages resulting from natural and man-made catastrophes, as well as for potentially large casualty and specialty exposures, we expect from time to time to become liable for substantial claim payments on short notice. Accordingly, our investment portfolio as a whole is structured to seek to preserve capital and provide a high level of liquidity, which means that the large majority of our investment portfolio consists of highly rated fixed income securities, including U.S. treasuries, agencies, highly rated sovereign and supranational securities, high-grade corporate securities and mortgage-backed and asset-backed securities. We also have an allocation to publicly traded equities reflected on our consolidated balance sheet as equity investments trading and an allocation to other investments (including catastrophe bonds, private equity investments, and fund investments).

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Other Investments

The table below shows our portfolio of other investments: 

	March 31, 2021		December 31, 2020		Change
(in thousands)
Catastrophe bonds	$	941,604	$	881,290	$	60,314
Private equity investments	75,874		79,807		(3,933)
Fund investments	361,578		295,851		65,727
Total other investments	$	1,379,056	$	1,256,948	$	122,108

We account for our other investments at fair value in accordance with FASB ASC Topic Financial Instruments. The fair value of our fund investments, which principally include private equity funds that invest in certain private equity and private credit asset classes, senior secured bank loan funds and hedge funds, is recorded on our consolidated balance sheet in other investments, and is generally established on the basis of the net asset valuation criteria established by the managers of such investments, if applicable. The net asset valuation criteria established by the managers of such investments is established in accordance with the governing documents of such investments. Many of our fund investments are subject to restrictions on redemptions and sales which are determined by the governing documents and limit our ability to liquidate these investments in the short term.

Some of our fund managers and fund administrators are unable to provide final fund valuations as of our current reporting date. We typically experience a reporting lag to receive a final net asset value report of one month for our hedge funds and senior secured bank loan funds and three months for private equity funds, although we have occasionally experienced delays of up to six months at year end, as the private equity funds typically complete their year-end audits before releasing their final net asset value statements.

In circumstances where there is a reporting lag between the current period end reporting date and the reporting date of the latest fund valuation, we estimate the fair value of these funds by starting with the prior month or quarter-end fund valuations, adjusting these valuations for actual capital calls, redemptions or distributions, and the impact of changes in foreign currency exchange rates, and then estimating the return for the current period. In circumstances in which we estimate the return for the current period, all information available to us is utilized. This principally includes using preliminary estimates reported to us by our fund managers, estimating returns based on the performance of broad market indices, or other valuation methods, where necessary. Actual final fund valuations may differ, perhaps materially so, from our estimates and these differences are recorded in our consolidated statement of operations in the period in which they are reported to us as a change in estimate. Included in net realized and unrealized gains (losses) on investments for the three months ended March 31, 2021 is income of $1.8 million (2020 - $1.3 million) representing the change in estimate during the period related to the difference between our estimated net realized and unrealized gains (losses) due to the lag in reporting discussed above and the actual amount as reported in the final net asset values provided by our fund managers.

Our estimate of the fair value of catastrophe bonds is based on quoted market prices, or when such prices are not available, by reference to broker or underwriter bid indications. See “Note 4. Fair Value Measurements” in our “Notes to the Consolidated Financial Statements” for additional information regarding the fair value of measurement of our investments.

We have committed capital to private equity investments, fund investments and investments in other ventures of $2.0 billion, of which $872.0 million has been contributed at March 31, 2021. Our remaining commitments to these investments at March 31, 2021 totaled $1.1 billion. In the future, we may enter into additional commitments in respect of private equity investments or individual portfolio company investment opportunities.

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Ratings

Financial strength ratings are important to the competitive position of reinsurance and insurance companies. We have received high long-term issuer credit and financial strength ratings from A.M. Best Company, Inc. (“A.M. Best”), S&P Global Ratings (“S&P”), Moody’s Investors Service (“Moody’s”) and Fitch Ratings Ltd. (“Fitch”), as applicable. These ratings represent independent opinions of an insurer’s financial strength, operating performance and ability to meet policyholder obligations, and are not an evaluation directed toward the protection of investors or a recommendation to buy, sell or hold any of our securities. Rating organizations continually review the financial positions of our principal operating subsidiaries and joint ventures and ratings may be revised or revoked by the agencies which issue them.

The ratings of our principal operating subsidiaries and joint ventures as of April 23, 2021 are presented below.

	A.M. Best (1)	S&P (2)	Moody's (3)	Fitch (4)
Renaissance Reinsurance Ltd.	A+	A+	A1	A+
DaVinci Reinsurance Ltd.	A	A+	A3	—
Renaissance Reinsurance of Europe Unlimited Company	A+	A+	—	—
Renaissance Reinsurance U.S. Inc.	A+	A+	—	—
RenaissanceRe Europe AG	A+	A+	—	—
RenaissanceRe Specialty U.S. Ltd.	A+	A+	—	—
Top Layer Reinsurance Ltd.	A+	AA	—	—
Vermeer Reinsurance Ltd.	A	—	—	—
RenaissanceRe Syndicate 1458	—	—	—	—
Lloyd's Overall Market Rating	A	A+	—	AA-

(1)    The A.M. Best ratings for our principal operating subsidiaries and joint ventures represent the insurer’s financial strength rating. The Lloyd’s Overall Market Rating represents Syndicate 1458’s financial strength rating.

(2)    The S&P ratings for our principal operating subsidiaries and joint ventures represent the insurer’s financial strength rating and the issuer’s long-term issuer credit rating. The Lloyd’s Overall Market Rating represents Syndicate 1458’s financial strength rating.

(3)    The Moody’s ratings represent the insurer’s financial strength rating.

(4)     The Fitch rating for Renaissance Reinsurance represents the insurer’s financial strength rating. The Lloyd’s Overall Market Rating represents Syndicate 1458’s financial strength rating.

As of April 23, 2021, there were no material changes to our ratings as disclosed in our Form 10-K for the year ended December 31, 2020.

SUPPLEMENTAL GUARANTOR FINANCIAL INFORMATION

In March 2020, the SEC issued Rule Release No. 33-10762, Financial Disclosures About Guarantors and Issuers of Guaranteed Securities and Affiliates Whose Securities Collateralize a Registrant’s Securities ("Release 33-10762”). Release 33-10762 simplifies the disclosure requirements related to certain registered securities under Rules 3-10 and 3-16 of SEC Regulation S-X, permitting registrants to provide certain alternative financial disclosures and non-financial disclosures in lieu of separate consolidating financial statements for subsidiary issuers and guarantors of registered debt securities if certain conditions are met. The amendments in Release 33-10762 are generally effective for filings on or after January 4, 2021, with early application permitted. We adopted the new disclosure requirements permitted under Release 33-10762 effective for the quarter ended March 31, 2021.

RenaissanceRe Finance, Inc. (“RenaissanceRe Finance”), a 100% owned subsidiary of RenaissanceRe, is the issuer of certain 3.700% Senior Notes due 2025 and 3.450% Senior Notes due 2027, each of which are fully and unconditionally guaranteed by RenaissanceRe. The guarantees are senior unsecured obligations of RenaissanceRe and rank equally in right of payment with all other existing and future unsecured and unsubordinated indebtedness of RenaissanceRe which may be outstanding from time to time. Each series of notes contain various covenants, including limitations on mergers and consolidations, and restrictions as

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to the disposition of, and the placing of liens on, stock of designated subsidiaries. For additional information related to the terms of the Company’s outstanding debt securities, see “Note 9. Debt and Credit Facilities” in the “Notes to the Consolidated Financial Statements” in the Company’s Form 10-K for the year ended December 31, 2020 and “Note 7. Debt and Credit Facilities” included herein.

The following tables present supplemental summarized financial information for RenaissanceRe and RenaissanceRe Finance (the “Obligor Group”). Intercompany transactions among the members of the Obligor Group have been eliminated. The financial information of non-obligor subsidiaries has been excluded from the summarized financial information. Significant intercompany transactions and receivable/payable balances between the Obligor Group and non-obligor subsidiaries are presented separately in the summarized financial information:

Summarized Balance Sheets

(in thousands)	March 31, 2021		December 31, 2020
Assets
Receivables due from non-obligor subsidiaries	$	12,373	$	11,662
Other current assets	185,204		251,415
Total current assets	$	197,577	$	263,077
Goodwill and other intangibles	$	111,148	$	112,110
Loan receivable from non-obligor subsidiaries	931,286		841,450
Other noncurrent assets	3,057,205		2,963,307
Total noncurrent assets	$	4,099,639	$	3,916,867
Liabilities
Payables due to non-obligor subsidiaries	$	211,791	$	10,281
Other current liabilities	25,881		25,645
Total current liabilities	$	237,672	$	35,926
Loan payable to non-obligor subsidiaries	$	202,979	$	987,605
Other noncurrent liabilities	1,093,551		307,168
Total noncurrent liabilities	$	1,296,530	$	1,294,773

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Summarized Statement of Operations

(in thousands)	Three months ended March 31, 2021
Revenues
Intercompany revenue with non-obligor subsidiaries	$	4,178
Other revenue	(3,008)
Total revenues	1,170
Expenses
Intercompany expense with non-obligor subsidiaries	9,139
Other expense	14,413
Total expenses	23,552
Income tax benefit	1,065
Net loss	(21,317)
Dividends on RenaissanceRe preference shares	(7,289)
Net loss attributable to Obligor Group	$	(28,606)

EFFECTS OF INFLATION

It is possible that the risk of general economic inflation has increased which could, among other things, cause claims and claim expenses to increase and also impact the performance of our investment portfolio. This risk may be exacerbated by the steps taken by governments and central banks throughout the world in responding to the COVID-19 pandemic. The actual effects of this potential increase in inflation on our results cannot be accurately known until, among other items, claims are ultimately settled. The onset, duration and severity of an inflationary period cannot be estimated with precision. We consider the anticipated effects of inflation on us in our catastrophe loss models. Our estimates of the potential effects of inflation are also considered in pricing and in estimating reserves for unpaid claims and claim expenses. The potential exists, after a catastrophe loss, for the development of inflationary pressures in a local economy.

OFF-BALANCE SHEET AND SPECIAL PURPOSE ENTITY ARRANGEMENTS

At March 31, 2021, we had not entered into any off-balance sheet arrangements, as defined in Item 303(a)(4) of Regulation S-K.

CONTRACTUAL OBLIGATIONS

In the normal course of business, we are party to a variety of contractual obligations as summarized in our Form 10-K for the year ended December 31, 2020. We consider these contractual obligations when assessing our liquidity requirements. As of March 31, 2021, there were no material changes in our contractual obligations as disclosed in the table of contractual obligations and related footnotes included in our Form 10-K for the year ended December 31, 2020.

CURRENT OUTLOOK

General Economic Conditions and the COVID-19 Pandemic

At the January 1 renewals, we were able to grow with existing and new customers across both of our segments and all of our platforms. We fully deployed the $1.1 billion of capital raised in our June 2020 equity offerings into our underwriting portfolio. We also raised and deployed significant additional capital within our joint venture and managed fund businesses. As we have grown, we have broadened our access to risk, writing more lines of business on more platforms. We have diversified our sources of capital through various owned and managed balance sheets as well as equity, debt and insurance-linked securities markets. This has afforded us significant flexibility to react when the world changes.

The COVID-19 pandemic has had immense impacts on a global scale, including on the insurance and reinsurance industries where it has raised many new questions and challenges for us and our industry.

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While we believe that we can continue to execute on our strategic plan and compete for, and meet, the demand for the protection that we provide, it is difficult to predict all of the potential impacts of the COVID-19 pandemic on the markets in which we participate and our ability to effectively respond to these changing market dynamics.

In particular, we believe the stresses in the global economy will continue and that this may result in increased market volatility. Also, the ongoing period of low interest rates may affect our ability to derive investment income from our investments. As interest rates begin to rise from historic lows, we expect that we will see an increase in investment income from our investment portfolio. The effects of these interest rate trends on our reinsurance and insurance business could be magnified for longer-tail business lines that are more inflation sensitive, particularly in our Casualty and Specialty segment, and in our other property class of business within our Property segment. Notwithstanding the many uncertainties and challenges that lie ahead, we believe that our track record of responding to industry events, differentiated risk management and client service capabilities, and access to diverse sources of both capital and risk position us favorably in the current environment.

Reinsurance Market Trends and Developments

Even before the onset of the COVID-19 pandemic, rates were rising across most lines of business. We believe that, unlike previous hard markets that have often been driven in large part by a lack of reinsurance capital, rate increases in the underlying insurance market are a primary contributor to the current market. We think that market conditions have also been impacted by factors such as climate change and social inflation, which have increased loss costs, and, together with historically low interest rates, are putting more pressure on underwriting results as a driver of returns.

We believe that these market conditions have created significant opportunities to source attractive risk in the lines of business that we write, and that we believe will result in superior returns for our shareholders. In the first quarter of 2021 we grew gross premiums written in areas where we saw the most opportunities for growth, notably, in our Casualty and Specialty segment and other property class of business. These areas of our business are particularly attractive at this time due to above trend rate increases, our strong risk selection capabilities and our long-standing customer relationships which provide us with superior access to these lines of business. Additionally, we believe that we are uniquely positioned to write a variety of risks, leveraging the enhancements we made over the last several years to our risk and capital management technology and underwriting expertise to cover additional lines of business. We anticipate that the markets in which we participate will continue to harden in 2021, and we plan to continue to seek to take advantage of additional opportunities throughout the year. We believe that our clients value our ability to be a long-term partner who brings access to multiple forms of capital and innovative, large-scale solutions.

Property. Winter Storm Uri posed unique challenges in the first quarter of 2021. However, we took a disciplined approach at the January 1 and April 1 property catastrophe renewals, expanding participation predominately with existing customers at improved rates. We also grew in catastrophe-exposed U.S. property excess and surplus lines in the other property class of business. We continue to carefully monitor ongoing, adverse trends in the Florida market with respect to claims practices, litigation risks, and exposure growth, and are prepared to continue to reduce our exposure to risks and accounts exposed to these trends.

Casualty and Specialty. We continue to see acceleration in the underlying rate increases across multiple lines of business and geographies within our Casualty and Specialty segment, and we expanded participation on multiple casualty and specialty lines. We anticipate that dislocation in several of these classes of business will continue to provide opportunities in 2021. We think that our prior work building strong relationships with key customers allowed us to gain superior access to desirable business.

See “Part I, Item 1A. Risk Factors” in our Form 10-K for additional information on factors that could cause our actual results to differ materially from those in the forward-looking statements contained in this Form 10-Q and other documents we file with the SEC.

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ITEM 3.        QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are principally exposed to four types of market risk: interest rate risk; foreign currency risk; credit risk; and equity price risk. Our investment guidelines permit, subject to approval, investments in derivative instruments such as futures, options, foreign currency forward contracts and swap agreements, which may be used to assume risks or for hedging purposes.

There were no material changes to these market risks, as disclosed in “Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk” in our Form 10-K for the year ended December 31, 2020, during the three months ended March 31, 2021, except as described below. See “Part II, Item 7A. Quantitative and Qualitative Disclosures about Market Risk,” in our Form 10-K for the year ended December 31, 2020 for a discussion of our exposure to these risks.

The ongoing and rapidly evolving nature of the COVID-19 pandemic could lead to periods of financial market volatility or a recession, which may increase the probability of credit losses in our investment portfolio. Volatility in global financial markets, together with low or negative interest rates, reduced liquidity and a slowdown in global economic conditions may adversely affect our investment portfolio. Additionally, we are exposed to counterparty credit risk, including with respect to reinsurance brokers, customers and retrocessionaires, which may materially increase to the extent the COVID-19 pandemic affects our ability to collect premiums receivable or reinsurance recoverable.

ITEM 4.        CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have evaluated the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(b) and 15d-15(b) of the Exchange Act, as of the end of the period covered by this report. Based upon that evaluation, our management, including our Chief Executive Officer and Chief Financial Officer, concluded that, at March 31, 2021, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed in Company reports filed or submitted under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and (ii) accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting during the quarter ended March 31, 2021, which were identified in connection with our evaluation required pursuant to Rules 13a-15 or 15d-15 under the Exchange Act, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II        OTHER INFORMATION

ITEM 1.       LEGAL PROCEEDINGS

There have been no material changes to the legal proceedings previously disclosed in our Form 10-K for the year ended December 31, 2020.

ITEM 1A.        RISK FACTORS

There have been no material changes to the risk factors previously disclosed in our Form 10-K for the year ended December 31, 2020.

ITEM 2.        UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Our 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 February 5, 2021, our Board of Directors approved a renewal of our authorized share repurchase program to an aggregate amount of up to $500.0 million. Unless terminated earlier by our Board of Directors, the program will expire when we have repurchased the full value of the shares authorized. The table below details the repurchases that were made under the program during the first quarter of 2021, and also includes other shares purchased, which represents common shares surrendered by employees in respect of withholding tax obligations on the vesting of restricted stock.

	Total shares purchased			Other shares purchased			Shares purchased under publicly announced repurchase program			Dollar maximum amount still available under repurchase program
	Shares purchased	Average price per share		Shares purchased	Average price per share		Shares purchased	Average price per share
										(in thousands)
Beginning dollar amount available to be repurchased (reflecting renewal on February 5, 2021)										$	500,000
January 1 - 31, 2021	—	$	—	—	$	—	—	$	—	—
February 1 - 28, 2021	1,111,545	$	159.46	35,201	$	159.23	1,076,344	$	159.47	(171,645)
March 1 - 31, 2021	26,010	$	162.61	26,010	$	162.61	—	$	—	—
Total	1,137,555	$	159.53	61,211	$	160.67	1,076,344	$	159.47	$	328,355

During the three months ended March 31, 2021, pursuant to our publicly announced share repurchase program, we repurchased 1.1 million common shares in open market transactions at an aggregate cost of $171.6 million and an average price of $159.47 per common share. At March 31, 2021, $328.4 million remained available for repurchase under the share repurchase program. Subsequent to March 31, 2021 and through the period ended April 23, 2021, we repurchased 330 thousand common shares in open market transactions at an aggregate cost of $55.3 million and an average price of $167.62 per common share. In the future, we may authorize additional purchase activities under the currently authorized share repurchase program, increase the amount authorized under the share repurchase program, or adopt additional trading plans. Our decision to repurchase common shares will depend on, among other matters, the market price of the common shares and our capital requirements.

ITEM 3.       DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4.        MINE SAFETY DISCLOSURES

Not applicable.

79

ITEM 5.        OTHER INFORMATION

None.

80

ITEM 6.    EXHIBITS

31.1	Certification of Kevin J. O’Donnell, Chief Executive Officer of RenaissanceRe Holdings Ltd., pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
31.2	Certification of Robert Qutub, Chief Financial Officer of RenaissanceRe Holdings Ltd., pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
32.1	Certification of Kevin J. O’Donnell, Chief Executive Officer of RenaissanceRe Holdings Ltd., pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Robert Qutub, Chief Financial Officer of RenaissanceRe Holdings Ltd., pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101).

81

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

RENAISSANCERE HOLDINGS LTD. 

Date: April 29, 2021    /s/ Robert Qutub

Robert Qutub

Executive Vice President and Chief Financial Officer

(Principal Financial Officer and Duly Authorized Officer)

Date: April 29, 2021    /s/ James C. Fraser

James C. Fraser

Senior Vice President and Chief Accounting Officer

(Principal Accounting Officer)

82

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Kevin J. O'Donnell, certify that:

1.I have reviewed this Form 10-Q of RenaissanceRe Holdings Ltd.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial
reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 29, 2021	/s/ Kevin J. O'Donnell
		Kevin J. O'Donnell
		Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Robert Qutub, certify that:

1.I have reviewed this Form 10-Q of RenaissanceRe Holdings Ltd.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial
reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 29, 2021	/s/ Robert Qutub
		Robert Qutub
		Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Form 10-Q of RenaissanceRe Holdings Ltd. (the “Company”) for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Kevin J. O'Donnell, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Kevin J. O'Donnell

Kevin J. O'Donnell

Chief Executive Officer

April 29, 2021

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Form 10-Q of RenaissanceRe Holdings Ltd. (the “Company”) for the quarter ended March 31, 2021, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Robert Qutub, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Robert Qutub

Robert Qutub

Chief Financial Officer

April 29, 2021

XML

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 23, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	001-14428
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
Entity Common Stock, Shares Outstanding (in shares)		49,637,716
Entity Central Index Key	0000913144
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false
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 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

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets
Fixed maturity investments trading, at fair value – amortized cost $13,258,985 at March 31, 2021 (December 31, 2020 – $13,155,035)	$ 13,309,234	$ 13,506,503
Short term investments, at fair value	5,091,143	4,993,735
Equity investments trading, at fair value	503,137	702,617
Other investments, at fair value	1,379,056	1,256,948
Investments in other ventures, under equity method	91,362	98,373
Total investments	20,373,932	20,558,176
Cash and cash equivalents	1,286,661	1,736,813
Premiums receivable	3,928,122	2,894,631
Prepaid reinsurance premiums	1,229,716	823,582
Reinsurance recoverable	3,160,667	2,926,010
Accrued investment income	62,573	66,743
Deferred acquisition costs and value of business acquired	786,941	633,521
Receivable for investments sold	841,156	568,293
Other assets	318,249	363,170
Goodwill and other intangible assets	248,080	249,641
Total assets	32,236,097	30,820,580
Liabilities
Reserve for claims and claim expenses	10,953,383	10,381,138
Unearned premiums	3,833,155	2,763,599
Debt	1,136,783	1,136,265
Reinsurance balances payable	4,254,645	3,488,352
Payable for investments purchased	1,133,787	1,132,538
Other liabilities	436,437	970,121
Total liabilities	21,748,190	19,872,013
Commitments and Contingencies
Redeemable noncontrolling interests	3,409,570	3,388,319
Shareholders’ Equity
Preference shares: $1.00 par value – 11,010,000 shares issued and outstanding at March 31, 2021 (December 31, 2020 – 11,010,000)	525,000	525,000
Common shares: $1.00 par value – 49,969,717 shares issued and outstanding at March 31, 2021 (December 31, 2020 – 50,810,618)	49,970	50,811
Additional paid-in capital	1,450,627	1,623,206
Accumulated other comprehensive loss	(12,382)	(12,642)
Retained earnings	5,065,122	5,373,873
Total shareholders’ equity attributable to RenaissanceRe	7,078,337	7,560,248
Total liabilities, noncontrolling interests and shareholders’ equity	$ 32,236,097	$ 30,820,580

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturity investments trading, amortized cost	$ 13,258,985	$ 13,155,035
Preference shares, par value (In dollars per share)	$ 1.00	$ 1.00
Preference shares, shares issued (In shares)	11,010,000	11,010,000
Preference shares, shares outstanding (in shares)	11,010,000	11,010,000
Common shares, par value (In dollars per share)	$ 1.00	$ 1.00
Common shares, shares issued (In shares)	49,969,717	50,810,618
Common shares, shares outstanding (In shares)	49,969,717	50,810,618

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Gross premiums written	$ 2,652,442	$ 2,025,721
Net premiums written	1,824,083	1,269,808
Increase in unearned premiums	(670,247)	(356,710)
Net premiums earned	1,153,836	913,098
Net investment income	79,804	99,473
Net foreign exchange losses	(22,788)	(5,728)
Equity in (losses) earnings of other ventures	(5,558)	4,564
Other income (loss)	2,171	(4,436)
Net realized and unrealized losses on investments	(345,563)	(110,707)
Total revenues	861,902	896,264
Expenses
Net claims and claim expenses incurred	867,051	570,954
Acquisition expenses	267,234	210,604
Operational expenses	55,311	67,461
Corporate expenses	10,405	15,991
Interest expense	11,912	14,927
Total expenses	1,211,913	879,937
(Loss) income before taxes	(350,011)	16,327
Income tax benefit	19,516	8,846
Net (loss) income	(330,495)	25,173
Net loss (income) attributable to redeemable noncontrolling interests	46,850	(98,091)
Net (loss) income attributable to RenaissanceRe	(283,645)	(72,918)
Dividends on preference shares	(7,289)	(9,056)
Net (loss) income attributable to RenaissanceRe common shareholders	$ (290,934)	$ (81,974)
Net loss attributable to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ (5.87)	$ (1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	(5.87)	(1.89)
Dividends per common share (in dollars per share)	$ 0.36	$ 0.35

XML

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Comprehensive loss
Net (loss) income	$ (330,495)	$ 25,173
Change in net unrealized losses on investments, net of tax	(1,811)	(657)
Foreign currency translation adjustments, net of tax	2,071	932
Comprehensive (loss) income	(330,235)	25,448
Net loss (income) attributable to redeemable noncontrolling interests	46,850	(98,091)
Comprehensive loss (income) attributable to redeemable noncontrolling interests	46,850	(98,091)
Comprehensive (loss) income attributable to RenaissanceRe	$ (283,385)	$ (72,643)

XML

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preference shares	Common shares	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings
Beginning balance at Dec. 31, 2019		$ 650,000	$ 44,148	$ 568,277	$ (1,939)	$ 4,710,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares		(125,000)	(406)	(62,215)
Issuance of restricted stock awards			292	(3,105)
Change in redeemable noncontrolling interests				(349)
Change in net unrealized losses on investments, net of tax	$ (657)				(657)
Foreign currency translation adjustments, net of tax	932				932
Net (loss) income	25,173
Net loss (income) attributable to redeemable noncontrolling interests	(98,091)					(98,091)
Dividends on common shares	(15,400)					(15,359)
Dividends on preference shares	(9,056)					(9,056)
Ending balance at Mar. 31, 2020	5,683,526	525,000	44,034	502,608	(1,664)	4,613,548
Beginning balance at Dec. 31, 2020	7,560,248	525,000	50,811	1,623,206	(12,642)	5,373,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of shares		0	(1,076)	(170,569)
Issuance of restricted stock awards			235	(145)
Change in redeemable noncontrolling interests				(1,865)
Change in net unrealized losses on investments, net of tax	(1,811)				(1,811)
Foreign currency translation adjustments, net of tax	2,071				2,071
Net (loss) income	(330,495)
Net loss (income) attributable to redeemable noncontrolling interests	46,850					46,850
Dividends on common shares	(17,800)					(17,817)
Dividends on preference shares	(7,289)					(7,289)
Ending balance at Mar. 31, 2021	$ 7,078,337	$ 525,000	$ 49,970	$ 1,450,627	$ (12,382)	$ 5,065,122

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows provided by operating activities
Net (loss) income	$ (330,495)	$ 25,173
Adjustments to reconcile net income to net cash provided by operating activities
Amortization, accretion and depreciation	1,747	(4,405)
Equity in undistributed earnings of other ventures	17,891	7,398
Net realized and unrealized losses on investments	360,424	110,707
Change in:
Premiums receivable	(1,033,491)	(505,545)
Prepaid reinsurance premiums	(406,134)	(384,145)
Reinsurance recoverable	(234,657)	25,714
Deferred acquisition costs and value of business acquired	(153,420)	(75,884)
Reserve for claims and claim expenses	572,245	22,358
Unearned premiums	1,069,556	714,939
Reinsurance balances payable	766,293	944,684
Other	(423,421)	(405,528)
Net cash provided by operating activities	206,538	475,466
Cash flows used in investing activities
Proceeds from sales and maturities of fixed maturity investments trading	3,469,130	3,661,294
Purchases of fixed maturity investments trading	(3,808,597)	(3,370,394)
Net sales (purchases) of equity investments trading	128,020	(44,514)
Net purchases of short term investments	(111,085)	(704,226)
Net purchases of other investments	(127,661)	(79,711)
Net purchases of investments in other ventures	(15,542)	(1,888)
Return of investment from investment in other ventures	2,604	9,157
Net cash used in investing activities	(463,131)	(530,282)
Cash flows used in financing activities
Dividends paid – RenaissanceRe common shares	(17,817)	(15,359)
Dividends paid – preference shares	(7,289)	(9,056)
RenaissanceRe common share repurchases	(171,645)	(62,621)
Repayment of debt	0	(250,000)
Redemption of 6.08% Series C preference shares	0	(125,000)
Net third-party redeemable noncontrolling interest share transactions	13,006	42,599
Taxes paid on withholding shares	(9,834)	(10,180)
Net cash used in financing activities	(193,579)	(429,617)
Effect of exchange rate changes on foreign currency cash	20	1,581
Net decrease in cash and cash equivalents	(450,152)	(482,852)
Cash and cash equivalents, beginning of period	1,736,813	1,379,068
Cash and cash equivalents, end of period	$ 1,286,661	$ 896,216

XML

Consolidated Statements of Cash Flows (Parenthetical)	3 Months Ended
	Mar. 31, 2021
Series C Preference Shares
Dividend rate, percentage	6.08%

XML

Organization

3 Months Ended

Mar. 31, 2021

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, 2020. RenaissanceRe was formed under the laws of Bermuda on June 7, 1993. Together with its wholly owned and majority-owned subsidiaries, joint ventures and managed funds, the Company provides property, casualty and specialty reinsurance and certain insurance solutions to its customers.

•Renaissance Reinsurance Ltd. (“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. 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 Syndicate 1458 (“Syndicate 1458”) is the Company’s Lloyd’s syndicate. RenaissanceRe Corporate Capital (UK) Limited, a wholly owned subsidiary of RenaissanceRe, is Syndicate 1458’s sole corporate member. RenaissanceRe Syndicate Management Ltd., a wholly owned subsidiary of RenaissanceRe, is the managing agent for Syndicate 1458.

•RenaissanceRe Europe AG (“RREAG”), a Swiss-domiciled reinsurance company, which has branches in Australia, Bermuda, the U.K. and the U.S., provides property, casualty and specialty reinsurance coverages to insurers and reinsurers on a worldwide basis.

•RenaissanceRe Specialty U.S. Ltd., a Bermuda-domiciled insurer, which operates subject to U.S. federal income tax.

•DaVinci Reinsurance Ltd. (“DaVinci”), a wholly-owned subsidiary of DaVinciRe Holdings Ltd. (“DaVinciRe”), is a managed joint venture formed by the Company to principally write property catastrophe reinsurance and certain casualty and specialty reinsurance lines of business on a global basis.

•Top Layer Reinsurance Ltd. is a managed joint venture formed by the Company to write high excess non-U.S. property catastrophe reinsurance.

•RenaissanceRe Underwriting Managers U.S. LLC, is licensed as a reinsurance intermediary broker in the State of Connecticut and underwrites specialty treaty reinsurance solutions on both a quota share and excess of loss basis on behalf of affiliates.

•Renaissance Underwriting Managers, Ltd. (“RUM”), a wholly owned subsidiary of RenaissanceRe, acts as exclusive underwriting manager for certain of our joint ventures or managed funds in return for fee-based income and profit participation.

•RenaissanceRe Fund Management Ltd. (“RFM”) is a wholly-owned Bermuda exempted company and acts as the exclusive investment fund manager for several of the Company’s joint ventures or managed funds, in return for a management fee, a performance based incentive fee, or both. RFM is registered as an Exempt Reporting Adviser with the Securities and Exchange Commission and serves as the investment adviser to third-party investors in the various private investment partnerships and insurance-related investment products offered by the Company.

•RenaissanceRe Medici Fund Ltd. (“Medici”) is an exempted company, incorporated under the laws of Bermuda and registered as an institutional fund. Medici invests, primarily on behalf of third-party investors, in various instruments that have returns primarily tied to property catastrophe risk.

•Upsilon RFO Re Ltd., formerly known as Upsilon Reinsurance II Ltd. (“Upsilon RFO”), a Bermuda domiciled special purpose insurer (“SPI”), is a managed fund formed by the Company principally to

provide additional capacity to the worldwide aggregate and per-occurrence primary and retrocessional property catastrophe excess of loss market.

•RenaissanceRe Upsilon Fund Ltd., an exempted Bermuda segregated accounts company registered as a Class A Professional Fund provides a fund structure through which third-party investors can invest in reinsurance risk managed by the Company.

•Vermeer Reinsurance Ltd. (“Vermeer”), an exempted Bermuda reinsurer, provides capacity focused on risk remote layers in the U.S. property catastrophe market. The Company maintains a majority voting control of Vermeer, while Stichting Pensioenfonds Zorg en Welzijn (“PFZW”), a pension fund represented by PGGM Vermogensbeheer B.V., a Dutch pension fund manager, retains economic benefits.

•Fibonacci Reinsurance Ltd. ("Fibonacci Re"), a Bermuda-domiciled SPI, provides 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.

•The Company and Reinsurance Group of America, Incorporated are engaged in an initiative (“Langhorne”) to source third-party capital to support reinsurers targeting large in-force life and annuity blocks. Langhorne Holdings LLC (“Langhorne Holdings”) was incorporated to own and manage certain reinsurance entities within Langhorne. Langhorne Partners LLC (“Langhorne Partners”) is the general partner for Langhorne and manages the third-parties investing in Langhorne Holdings.

•Mona Lisa Re Ltd. (“Mona Lisa Re”), a Bermuda domiciled SPI, provides reinsurance capacity to subsidiaries of RenaissanceRe, namely Renaissance Reinsurance and DaVinci, through reinsurance agreements which are collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes.

•Following the acquisition of Tokio Millennium Re AG and certain associated entities and subsidiaries (collectively, “TMR”) on March 22, 2019, the Company managed Shima Reinsurance Ltd. (“Shima Re”), Norwood Re Ltd. (“Norwood Re”) and Blizzard Re Ltd. (“Blizzard,” together with Shima Re and Norwood Re, the “TMR managed third-party capital vehicles”), which provided third-party investors with access to reinsurance risk. The TMR managed third-party capital vehicles no longer write new business. The Company ceased providing management services to Blizzard effective November 1, 2020, and Shima Re and Norwood Re effective December 1, 2020.

XML

Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

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, 2020, 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 recoverable and premiums receivable, including provisions for reinsurance recoverable and premiums receivable to reflect expected credit losses; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges; deferred acquisition costs and the value of business acquired and the Company’s deferred tax valuation allowance.

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (”ASU 2019-12”). Among other things, ASU 2019-12 eliminates certain exceptions for recognizing deferred taxes for investments, performing intraperiod tax allocation and calculating income taxes in interim periods. ASU 2019-12 also clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Accordingly, the Company adopted ASU 2019-12 effective January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s consolidated statements of operations and financial position.

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Investments

3 Months Ended

Mar. 31, 2021

Investments [Abstract]

Investments

INVESTMENTS

Fixed Maturity Investments Trading

The following table summarizes the fair value of fixed maturity investments trading:

	March 31, 2021		December 31, 2020
U.S. treasuries	$	5,107,878	$	4,960,409
Agencies	227,184		368,032
Non-U.S. government	518,162		491,531
Non-U.S. government-backed corporate	335,662		338,014
Corporate	4,289,072		4,261,025
Agency mortgage-backed	957,563		1,113,792
Non-agency mortgage-backed	272,529		291,444
Commercial mortgage-backed	713,044		791,272
Asset-backed	888,140		890,984
Total fixed maturity investments trading	$	13,309,234	$	13,506,503

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.

March 31, 2021	Amortized  Cost		Fair Value
Due in less than one year	$	568,444	$	572,443
Due after one through five years	5,498,414		5,569,638
Due after five through ten years	3,822,345		3,786,423
Due after ten years	562,618		549,453
Mortgage-backed	1,922,325		1,943,137
Asset-backed	884,839		888,140
Total	$	13,258,985	$	13,309,234

Equity Investments Trading

The following table summarizes the fair value of equity investments trading:

	March 31, 2021		December 31, 2020
Financials	$	241,360	$	452,765
Communications and technology	123,204		119,592
Consumer	45,586		44,477
Industrial, utilities and energy	48,935		43,380
Healthcare	36,248		35,140
Basic materials	7,804		7,263
Total	$	503,137	$	702,617

Pledged Investments

At March 31, 2021, $8.4 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, 2020 - $8.1 billion). Of this amount, $2.5 billion is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities (December 31, 2020 - $2.5 billion).

Reverse Repurchase Agreements

At March 31, 2021, the Company held $25.0 million (December 31, 2020 - $126.5 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
	March 31, 2021		March 31, 2020
Fixed maturity investments	$	62,933	$	73,338
Short term investments	573		12,092
Equity investments	1,491		1,551
Other investments
Catastrophe bonds	14,468		14,139
Other	3,801		1,629
Cash and cash equivalents	102		1,504
	83,368		104,253
Investment expenses	(3,564)		(4,780)
Net investment income	$	79,804	$	99,473

Net Realized and Unrealized Losses on Investments

Net realized and unrealized losses on investments are as follows:

	Three months ended
	March 31, 2021		March 31, 2020
Net realized gains on fixed maturity investments trading	$	20,398	$	57,487
Net unrealized losses on fixed maturity investments trading	(297,018)		(20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)		37,142
Net realized and unrealized gains on investments-related derivatives	14,861		33,181
Net realized gains (losses) on equity investments trading	109,887		(15,047)
Net unrealized losses on equity investments trading	(177,809)		(105,937)
Net realized and unrealized losses on equity investments trading	(67,922)		(120,984)
Net realized and unrealized losses on other investments - catastrophe bonds	(19,083)		(14,352)
Net realized and unrealized gains (losses) on other investments - other	3,201		(45,694)
Net realized and unrealized losses on investments	$	(345,563)	$	(110,707)

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Fair Value Measurements

3 Months Ended

Mar. 31, 2021

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 as 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 at the measurement date. 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 March 31, 2021	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	$	5,107,878	$	5,107,878	$	—	$	—
Agencies	227,184		—		227,184		—
Non-U.S. government	518,162		—		518,162		—
Non-U.S. government-backed corporate	335,662		—		335,662		—
Corporate	4,289,072		—		4,289,072		—
Agency mortgage-backed	957,563		—		957,563		—
Non-agency mortgage-backed	272,529		—		272,529		—
Commercial mortgage-backed	713,044		—		713,044		—
Asset-backed	888,140		—		888,140		—
Total fixed maturity investments	13,309,234		5,107,878		8,201,356		—
Short term investments	5,091,143		—		5,091,143		—
Equity investments trading	503,137		503,137		—		—
Other investments
Catastrophe bonds	941,604		—		941,604		—
Private equity investments	75,874		—		—		75,874
	1,017,478		—		941,604		75,874
Fund investments (1)	361,578
Total other investments	1,379,056		—		941,604		75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,421)		—		—		(6,421)
Derivative assets (3)	20,449		2,317		18,132		—
Derivative liabilities (3)	(26,464)		(2,494)		(23,970)		—
Total other assets and (liabilities)	(12,436)		(177)		(5,838)		(6,421)
	$	20,270,134	$	5,610,838	$	14,228,265	$	69,453

(1)    Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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 March 31, 2021 was $0.6 million of other assets and $7.0 million of other liabilities.

(3)    See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

At December 31, 2020	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	$	4,960,409	$	4,960,409	$	—	$	—
Agencies	368,032		—		368,032		—
Non-U.S. government	491,531		—		491,531		—
Non-U.S. government-backed corporate	338,014		—		338,014		—
Corporate	4,261,025		—		4,261,025		—
Agency mortgage-backed	1,113,792		—		1,113,792		—
Non-agency mortgage-backed	291,444		—		291,444		—
Commercial mortgage-backed	791,272		—		791,272		—
Asset-backed	890,984		—		890,984		—
Total fixed maturity investments	13,506,503		4,960,409		8,546,094		—
Short term investments	4,993,735		—		4,993,735		—
Equity investments trading	702,617		702,617		—		—
Other investments
Catastrophe bonds	881,290		—		881,290		—
Private equity investments	79,807		—		—		79,807
	961,097		—		881,290		79,807
Fund investments (1)	295,851
Total other investments	1,256,948		—		881,290		79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,211)		—		—		(6,211)
Derivative assets (3)	45,233		156		45,077		—
Derivative liabilities (3)	(22,360)		(567)		(21,793)		—
Total other assets and (liabilities)	16,662		(411)		23,284		(6,211)
	$	20,476,465	$	5,662,615	$	14,444,403	$	73,596

(1)     Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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, 2020 was $1.4 million of other assets and $7.6 million of other liabilities.

(3)     See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

Level 1 and Level 2 Assets and Liabilities Measured at Fair Value

Fixed Maturity Investments

Fixed maturity investments included in Level 1 consist of the Company’s investments in U.S. treasuries. Fixed maturity investments included in Level 2 are agencies, municipal, non-U.S. government, non-U.S. government-backed corporate, corporate, agency mortgage-backed, non-agency mortgage-backed, commercial mortgage-backed and asset-backed.

The Company’s fixed maturity investments are primarily priced using pricing services, such as index providers and pricing vendors, as well as broker quotations. In general, the pricing vendors provide pricing for a high volume of liquid securities that are actively traded. For securities that do not trade on an

exchange, the pricing services generally utilize market data and other observable inputs in matrix pricing models to determine month end prices. Observable inputs include benchmark yields, reported trades, broker-dealer quotes, issuer spreads, bids, offers, reference data and industry and economic events. Index pricing generally relies on market traders as the primary source for pricing; however, models are also utilized to provide prices for all index eligible securities. The models use a variety of observable inputs such as benchmark yields, transactional data, dealer runs, broker-dealer quotes and corporate actions. Prices are generally verified using third-party data. Securities which are priced by an index provider are generally included in the index.

In general, broker-dealers value securities through their trading desks based on observable inputs. The methodologies include mapping securities based on trade data, bids or offers, observed spreads, and performance on newly issued securities. Broker-dealers also determine valuations by observing secondary trading of similar securities. Prices obtained from broker quotations are considered non-binding, however they are based on observable inputs and by observing secondary trading of similar securities obtained from active, non-distressed markets.

The Company considers these 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 March 31, 2021, the Company’s U.S. treasuries fixed maturity investments were primarily priced by pricing services and had a weighted average yield to maturity of 0.7% and a weighted average credit quality of AA (December 31, 2020 - 0.4% and AA, respectively). When pricing these securities, the pricing services utilize daily data from many real time market sources, including active broker-dealers. Certain data sources are regularly reviewed for accuracy to attempt to ensure the most reliable price source is used for each issue and maturity date.

Agencies

Level 2 - At March 31, 2021, the Company’s agency fixed maturity investments had a weighted average yield to maturity of 1.4% and a weighted average credit quality of AA (December 31, 2020 - 0.9% 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.

Non-U.S. Government

Level 2 - At March 31, 2021, the Company’s non-U.S. government fixed maturity investments had a weighted average yield to maturity of 1.0% and a weighted average credit quality of AA (December 31, 2020 - 0.5% 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 March 31, 2021, the Company’s non-U.S. government-backed corporate fixed maturity investments had a weighted average yield to maturity of 1.2% and a weighted average credit quality of AA (December 31, 2020 - 1.0% 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 quality 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 March 31, 2021, the Company’s corporate fixed maturity investments principally consisted of U.S. and international corporations and had a weighted average yield to maturity of 2.5% and a weighted average credit quality of BBB (December 31, 2020 - 2.2% 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 March 31, 2021, the Company’s agency mortgage-backed fixed maturity investments included agency residential mortgage-backed securities with a weighted average yield to maturity of 1.7%, a weighted average credit quality of AA and a weighted average life of 4.9 years (December 31, 2020 - 1.0%, AA and 3.8 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 - At March 31, 2021, the Company’s non-agency residential mortgage-backed fixed maturity investments had a weighted average yield to maturity of 3.0%, a weighted average credit quality of non-investment grade and a weighted average life of 5.3 years (December 31, 2020 - 3.0%, non-investment grade and 5.2 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 March 31, 2021, the Company’s commercial mortgage-backed fixed maturity investments had a weighted average yield to maturity of 1.8%, a weighted average credit quality of AAA, and a weighted average life of 4.7 years (December 31, 2020 - 1.5%, 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 March 31, 2021, the Company’s asset-backed fixed maturity investments had a weighted average yield to maturity of 1.7%, a weighted average credit quality of AA and a weighted average life of 3.1 years (December 31, 2020 - 1.8%, AA and 3.2 years, respectively). The underlying collateral for the Company’s asset-backed fixed maturity investments primarily consists of collateralized loan obligations 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 March 31, 2021, the Company’s short term investments had a weighted average yield to maturity of 0.1% and a weighted average credit quality of AAA (December 31, 2020 - 0.1% 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 March 31, 2021	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	75,874	Internal valuation model	Discount rate	n/a	n/a	9.0%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(168)		Internal valuation model	Bond price	n/a	n/a	$	99.51
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(6,849)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,895
				Expected loss ratio	n/a	n/a	21.9		%
				Discount rate	n/a	n/a	0.9		%
Assumed and ceded (re)insurance contracts	596		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,421)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	69,453

At December 31, 2020	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	79,807	Internal valuation model	Discount rate	n/a	n/a	9.0		%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(190)		Internal valuation model	Bond price	n/a	n/a	$	99.31
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(7,395)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,514
				Expected loss ratio	n/a	n/a	24.0		%
				Discount rate	n/a	n/a	0.4		%
Assumed and ceded (re)insurance contracts	1,374		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,211)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	73,596

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 - January 1, 2021	$	79,807	$	(6,211)	$	73,596
Total realized and unrealized losses
Included in net realized and unrealized losses on investments	(3,936)		—		(3,936)
Included in other income (loss)	—		96		96
Total foreign exchange gains	3		—		3
Purchases	—		(306)		(306)
Sales	—		—		—
Balance - March 31, 2021	$	75,874	$	(6,421)	$	69,453

	Other investments		Other assets  and (liabilities)		Total
Balance - January 1, 2020	$	74,634	$	4,731	$	79,365
Total realized and unrealized losses
Included in net realized and unrealized gains on investments	(14,156)		—		(14,156)
Included in other income (loss)	—		(2,897)		(2,897)
Total foreign exchange losses	(21)		—		(21)
Purchases	20,962		(611)		20,351
Sales	(8,799)		—		(8,799)
Balance - March 31, 2020	$	72,620	$	1,223	$	73,843

Other Investments

Private Equity Investments

Level 3 - At March 31, 2021, the Company’s other investments included $75.9 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, and discount rates applied to the expected cash flows of the underlying entity in various scenarios. These unobservable inputs in isolation can cause significant increases or decreases in fair value. Generally, an increase in the liquidity discount rate or discount rates would result in a decrease in the fair value of these private equity investments.

Other Assets and Liabilities

Assumed and Ceded (Re)insurance Contracts

Level 3 - At March 31, 2021, the Company had a $0.2 million net liability 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 March 31, 2021, the Company had a $6.8 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 March 31, 2021, the Company had a $0.6 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 March 31, 2021 were debt obligations of $1.1 billion (December 31, 2020 - $1.1 billion). At March 31, 2021, the fair value of the Company’s debt obligations was $1.2 billion (December 31, 2020 – $1.3 billion).

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. Refer to “Note 7. Debt and Credit Facilities” for additional information related to 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:

	March 31, 2021		December 31, 2020
Other investments	$	1,379,056	$	1,256,948
Other assets	$	6,437	$	8,982
Other liabilities	$	12,858	$	15,193

Included in net realized and unrealized losses on investments for the three months ended March 31, 2021 was net unrealized gains of $3.2 million related to the changes in fair value of other investments (2020 – net unrealized losses of $4.7 million).

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 March 31, 2021	Fair Value		Unfunded Commitments		Redemption Frequency	Redemption Notice Period (Minimum Days)	Redemption Notice Period (Maximum Days)
Private equity funds	$	333,910	$	1,031,629	See below	See below	See below
Senior secured bank loan funds	16,886		7,920		See below	See below	See below
Hedge funds	10,782		—		See below	See below	See below
Total other investments measured using net asset valuations	$	361,578	$	1,039,549

Private Equity Funds

The Company’s investments in private equity funds include alternative asset limited partnerships (or similar corporate structures) that invest in certain private equity and private credit asset classes including U.S. and global leveraged buyouts, U.S. direct lending, secondaries, mezzanine investments, distressed securities, real estate, and oil, gas and power. The Company generally has no right to redeem its interest in any of these fund investments in advance of dissolution of the applicable limited partnerships. Instead, the nature of these investments is that distributions are received by the Company in connection with the liquidation of the underlying assets of the respective fund. It is estimated that the majority of the underlying assets of the limited partnerships would liquidate over 7 to 10 years from inception of the respective limited partnership.

Senior Secured Bank Loan Funds

At March 31, 2021, the Company had $16.9 million invested in closed end funds which invest primarily in loans. The Company has no right to redeem its investment in these funds. It is estimated that the majority of the underlying assets in these closed end funds would begin to liquidate over 4 to 5 years from inception of the applicable fund.

Hedge Funds

At March 31, 2021, the Company had $10.8 million of investments in hedge funds that are primarily focused on global credit opportunities which are generally redeemable at the option of the Company.

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Reinsurance

3 Months Ended

Mar. 31, 2021

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
	March 31, 2021		March 31, 2020
Premiums written
Direct	$	225,139	$	147,692
Assumed	2,427,303		1,878,029
Ceded	(828,359)		(755,913)
Net premiums written	$	1,824,083	$	1,269,808
Premiums earned
Direct	$	162,089	$	134,229
Assumed	1,416,646		1,149,733
Ceded	(424,899)		(370,864)
Net premiums earned	$	1,153,836	$	913,098
Claims and claim expenses
Gross claims and claim expenses incurred	$	1,250,246	$	747,715
Claims and claim expenses recovered	(383,195)		(176,761)
Net claims and claim expenses incurred	$	867,051	$	570,954

In assessing an allowance for reinsurance assets, which includes premiums receivable and reinsurance recoverable, the Company considers historical information, financial strength of reinsurers, collateralization amounts, and ratings to determine the appropriateness of the allowance. In assessing future default for reinsurance assets, the Company evaluates the provision for current expected credit losses under the probability of default and loss given default method. The Company utilizes its internal capital and risk models, which use counterparty ratings from major rating agencies, and assesses the current market conditions for the likelihood of default. The Company updates its internal capital and risk models for counterparty ratings and current market conditions on a periodic basis. Historically, the Company has not experienced material credit losses from reinsurance assets.

Premiums receivable reflect premiums written based on contract and policy terms and include estimates based on information received from both insureds and ceding companies and our own judgment.

Consequently, premiums receivable include premiums reported by the ceding companies, supplemented by our estimates of premiums that are written but not reported. Due to the nature of reinsurance, ceding companies routinely report and remit premiums to us subsequent to the contract coverage period, although the time lag involved in the process of reporting and collecting premiums is typically shorter than the lag in reporting losses.

At March 31, 2021, the Company’s premiums receivable balance was $3.9 billion (December 31, 2020 - $2.9 billion). Of the Company’s premiums receivable balance as of March 31, 2021, the majority are receivable from highly rated counterparties and Lloyd’s syndicates. The provision for current expected credit losses on the Company’s premiums receivable was $3.8 million at March 31, 2021 (December 31, 2020 - $6.0 million). The following table provides a roll forward of the provision for current expected credit losses of the Company’s premiums receivable:

Three months ended March 31	2021
Beginning balance	$	5,961
Provision for allowance	(2,179)
Ending balance	$	3,782

Reinsurance recoverable reflects amounts due from reinsurers based on the claim liabilities associated with the reinsured policy. The Company accrues amounts that are due from assuming companies based on estimated ultimate losses applicable to the contracts.

At March 31, 2021, the Company’s reinsurance recoverable balance was $3.2 billion (December 31, 2020 - $2.9 billion). Of the Company’s reinsurance recoverable balance at March 31, 2021, 45.2% is fully collateralized by our reinsurers, 52.9% is recoverable from reinsurers rated A- or higher by major rating agencies and 1.9% is recoverable from reinsurers rated lower than A- by major rating agencies (December 31, 2020 - 45.2%, 53.4% and 1.4%, respectively). The reinsurers with the three largest balances accounted for 15.0%, 10.2% and 6.1%, respectively, of the Company’s reinsurance recoverable balance at March 31, 2021 (December 31, 2020 - 15.3%, 10.8% and 6.7%, respectively). The provision for current expected credit losses was $6.6 million at March 31, 2021 (December 31, 2020 - $6.3 million). The three largest company-specific components of the provision for current expected credit losses represented 12.7%, 7.6% and 5.1%, respectively, of the Company’s total provision for current expected credit losses at March 31, 2021 (December 31, 2020 - 13.2%, 13.0% and 6.7%, respectively). The following table provides a roll forward of the provision for current expected credit losses of the Company’s reinsurance recoverable:

Three months ended March 31	2021
Beginning balance	$	6,334
Provision for allowance	271
Ending balance	$	6,605

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Reserve for Claims and Claim Expenses

3 Months Ended

Mar. 31, 2021

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 Company’s reserving committee, which includes members of the Company’s senior management, reviews, discusses, and

assesses the reasonableness and adequacy of the reserving estimates included in our unaudited financial statements.

The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR:

At March 31, 2021	Case Reserves		Additional Case Reserves		IBNR		Total
Property	$	1,292,683	$	1,333,734	$	2,145,953	$	4,772,370
Casualty and Specialty	1,801,362		147,822		4,231,829		6,181,013
Total	$	3,094,045	$	1,481,556	$	6,377,782	$	10,953,383
At December 31, 2020
Property	$	1,127,909	$	1,617,003	$	1,627,541	$	4,372,453
Casualty and Specialty	1,651,150		133,843		4,223,692		6,008,685
Total	$	2,779,059	$	1,750,846	$	5,851,233	$	10,381,138

Activity in the liability for unpaid claims and claim expenses is summarized as follows:

Three months ended March 31	2021		2020
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period	$	7,455,128	$	6,593,052
Net incurred related to:
Current year	876,083		557,054
Prior years	(9,032)		13,900
Total net incurred	867,051		570,954
Net paid related to:
Current year	14,751		31,201
Prior years	486,488		436,286
Total net paid	501,239		467,487
Foreign exchange (1)	(28,224)		(55,395)
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period	7,792,716		6,641,124
Reinsurance recoverable as of end of period	3,160,667		2,765,583
Reserve for claims and claim expenses as of end of period	$	10,953,383	$	9,406,707

(1)    Reflects the impact of the foreign exchange revaluation of the net reserve for claims and claim expenses 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 recoverable, as well as changes to loss related premiums such as reinstatement premiums and redeemable noncontrolling interest, 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 net development by segment of its liability for unpaid claims and claim expenses:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Property	$	(5,162)	$	13,901
Casualty and Specialty	(3,870)		(1)
Total net (favorable) adverse development of prior accident years net claims and claim expenses	$	(9,032)	$	13,900

Changes to prior year estimated claims reserves increased net income by $9.0 million during the three months ended March 31, 2021 (2020 - decreased net income by $13.9 million), excluding the consideration of changes in reinstatement, adjustment or other premium items, profit commissions, redeemable noncontrolling interests - DaVinciRe and Vermeer, and income tax.

Property Segment

The following tables detail the development of the Company’s liability for net 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:

Three months ended March 31	2021
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	(4,742)
2018 Large Loss Events	(3,263)
2017 Large Loss Events	(5,508)
Other	(679)
Total large catastrophe events	(14,192)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	9,030
Total small catastrophe events and attritional loss movements	9,030
Total catastrophe and attritional net claims and claim expenses	(5,162)
Total net favorable development of prior accident years net claims and claim expenses	$	(5,162)

The net favorable development of prior accident years net claims and claim expenses within the Company’s Property segment in the three months ended March 31, 2021 of $5.2 million was primarily comprised of net favorable development on prior accident years net claims and claim expenses associated with the following large catastrophe events:

•$4.7 million associated with Hurricane Dorian and Typhoon Faxai, Typhoon Hagibis and losses associated with aggregate loss contracts (collectively, the “2019 Large Loss Events”);

•$3.3 million associated with Typhoons Jebi, Mangkhut and Trami, Hurricane Florence, the wildfires in California during the third and fourth quarters of 2018, Hurricane Michael and certain losses associated with aggregate loss contracts (collectively, the ”2018 Large Loss Events”); and

•$5.5 million 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”).

Three months ended March 31	2020
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	$	(19,681)
2018 Large Loss Events	(14,200)
2017 Large Loss Events	(6,237)
Other	8,027
Total large catastrophe events	(32,091)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	45,992
Total small catastrophe events and attritional loss movements	45,992
Total net adverse development of prior accident years net claims and claim expenses	$	13,901

The net adverse development of prior accident years net claims and claim expenses within the Company’s Property segment in the three months ended March 31, 2020 of $13.9 million was comprised of net adverse development of $54.0 million primarily within the Company’s other property class of business and principally driven by higher than expected attritional losses related to lines of business where the Company principally estimates net claims and claim expenses using traditional actuarial methods, combined with the impact of certain of the Company’s whole account ceded protections. Partially offsetting this adverse development was favorable development on prior accident years net claims and claim expenses associated with the following large catastrophe events:

•$19.7 million associated with the 2019 Large Loss Events;

•$14.2 million associated with the 2018 Large Loss Events; and

•$6.2 million associated with the 2017 Large Loss Events.

Casualty and Specialty Segment

The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Actuarial methods - actual reported claims less than expected claims	$	(3,870)	$	(1)
Total net favorable development of prior accident years net claims and claim expenses	$	(3,870)	$	(1)

The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment of $3.9 million in the three months ended March 31, 2021 was due to reported losses generally coming in lower than expected on attritional net claims and claim expenses, principally within our specialty lines of business.

The net favorable development of prior accident years net claims and claim expenses within the Company’s Casualty and Specialty segment of $1.0 thousand in the three months ended March 31, 2020 was due to reported losses generally coming in as expected on attritional net claims and claim expenses.

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Debt and Credit Facilities

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Debt and Credit Facilities

DEBT AND CREDIT FACILITIES

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, 2020.

Debt Obligations

A summary of the Company’s debt obligations on its consolidated balance sheets is set forth below:

	March 31, 2021				December 31, 2020
	Fair Value		Carrying Value		Fair Value		Carrying Value
3.600% Senior Notes due 2029	$	431,360	$	392,619	$	453,932	$	392,391
3.450% Senior Notes due 2027	323,262		296,909		329,661		296,787
3.700% Senior Notes due 2025	310,881		298,519		315,273		298,428
4.750% Senior Notes due 2025 (DaVinciRe) (1)	165,746		148,736		162,203		148,659
Total debt	$	1,231,249	$	1,136,783	$	1,261,069	$	1,136,265

(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.

Credit Facilities

The outstanding amounts issued or drawn under each of the Company’s significant credit facilities is set forth below:

At March 31, 2021	Issued or Drawn
Revolving Credit Facility (1)	$	—
Bilateral Letter of Credit Facilities
Secured	392,116
Unsecured	488,532
Funds at Lloyd’s Letter of Credit Facility	225,000
	$	1,105,648

(1)     At March 31, 2021, no amounts were issued or drawn under this facility.

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Noncontrolling Interests

3 Months Ended

Mar. 31, 2021

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:

	March 31, 2021		December 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	1,555,714	$	1,560,693
Redeemable noncontrolling interest - Medici	737,702		717,999
Redeemable noncontrolling interest - Vermeer	1,116,154		1,109,627
Redeemable noncontrolling interests	$	3,409,570	$	3,388,319

A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations is set forth below:

	Three months ended
	March 31, 2021		March 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	(39,934)	$	84,906
Redeemable noncontrolling interest - Medici	(13,443)		(4,678)
Redeemable noncontrolling interest - Vermeer	6,527		17,863
Net (loss) income attributable to redeemable noncontrolling interests	$	(46,850)	$	98,091

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 and all significant intercompany transactions have been eliminated. 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 28.7% at March 31, 2021 (December 31, 2020 - 21.4%).

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.

2021

During the three months ended March 31, 2021, DaVinciRe completed an equity capital raise of $250.0 million, comprised of $150.9 million from third-party investors and $99.1 million from RenaissanceRe. In addition, RenaissanceRe sold an aggregate of $40.0 million of its shares in DaVinciRe to third-party investors and purchased an aggregate of $156.7 million of shares from third-party investors. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to these transactions was 28.7%.

2020

Effective January 1, 2020, the Company sold an aggregate of $10.0 million of its shares in DaVinciRe to an existing third-party investor. The Company’s noncontrolling economic ownership in DaVinciRe subsequent to this transaction was 21.4%.

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
	March 31, 2021		March 31, 2020
Beginning balance	$	1,560,693	$	1,435,581
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(155,971)		2,607
Sale of shares to redeemable noncontrolling interests	190,926		9,991
Net (loss) income attributable to redeemable noncontrolling interest	(39,934)		84,906
Ending balance	$	1,555,714	$	1,533,085

Redeemable Noncontrolling Interest - Medici

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.

2021

During the three months ended March 31, 2021, third-party investors subscribed for $40.8 million and redeemed $7.7 million of the participating, non-voting common shares of Medici. As a result of these net subscriptions, the Company’s noncontrolling economic ownership in Medici was 15.4% at March 31, 2021.

2020

During the three months ended March 31, 2020, third-party investors subscribed for $54.6 million and redeemed $4.8 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 11.2% at March 31, 2020.

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
	March 31, 2021		March 31, 2020
Beginning balance	$	717,999	$	632,112
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(7,699)		(4,764)
Sale of shares to redeemable noncontrolling interests	40,845		54,613
Net loss attributable to redeemable noncontrolling interest	(13,443)		(4,678)
Ending balance	$	737,702	$	677,283

Redeemable Noncontrolling Interest – Vermeer

RenaissanceRe owns 100% of the voting non-participating shares of Vermeer, while the sole third-party investor, PFZW, owns 100% of the non-voting participating shares of Vermeer and retains all of the economic benefits. Vermeer is managed by RUM in return for a management fee. The Company has 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 of Vermeer. As a result, the Company consolidates Vermeer and all significant inter-company transactions have been eliminated. As PFZW owns all of the economics of Vermeer, all of Vermeer’s earnings are allocated to PFZW in the consolidated statement 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.

The activity in redeemable noncontrolling interest – Vermeer is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	1,109,627	$	1,003,615
Net income attributable to redeemable noncontrolling interest	6,527		17,863
Ending balance	$	1,116,154	$	1,021,478

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Variable Interest Entities

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

VARIABLE INTEREST ENTITIES

Upsilon RFO

RenaissanceRe indirectly owns a portion of the participating non-voting preference shares of Upsilon RFO and all of Upsilon RFO’s voting Class A shares. The shareholders (other than the voting Class A shareholder) participate in all of the profits or losses of Upsilon RFO while their shares remain outstanding. The shareholders (other than the voting 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.

2021

During the three months ended March 31, 2021, $470.3 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $32.3 million to the Company. Also during the three months ended March 31, 2021 and following the release of collateral that was previously held by cedants associated with prior years’ contracts, Upsilon RFO returned $145.0 million of capital to its investors, including $9.2 million to the Company. At March 31, 2021, the Company’s participation in the risks assumed by Upsilon RFO was 12.8%.

At March 31, 2021, the Company’s consolidated balance sheet included total assets and total liabilities of Upsilon RFO of $3.9 billion and $3.9 billion, respectively (December 31, 2020 - $3.8 billion and $3.8 billion, respectively). Of the total assets and liabilities, a net amount of $2.0 billion is attributable to the Company, and $0.3 billion is attributable to third-party investors.

2020

During the three months ended March 31, 2020, Upsilon RFO returned $81.8 million of capital to its investors, including $29.9 million to the Company. In addition, during the three months ended March 31, 2020, $620.9 million of Upsilon RFO non-voting preference shares were issued to existing investors, including $75.4 million to the Company. At March 31, 2020, the Company’s participation in the risks assumed by Upsilon RFO was 14.2%.

Vermeer

Vermeer provides capacity focused on risk remote layers in the U.S. property catastrophe market. See “Note 8. Noncontrolling Interests” for additional information regarding Vermeer.

At March 31, 2021, the Company’s consolidated balance sheet included total assets and total liabilities of Vermeer of $1.2 billion and $47.5 million, respectively (December 31, 2020 - $1.1 billion and $36.7 million, respectively). In addition, the Company’s consolidated balance sheet included redeemable noncontrolling interests associated with Vermeer of $1.1 billion at March 31, 2021 (December 31, 2020 - $1.1 billion).

Mona Lisa Re Ltd.

Mona Lisa Re provides reinsurance capacity to subsidiaries of RenaissanceRe through reinsurance agreements which are collateralized and funded by Mona Lisa Re through the issuance of one or more series of principal-at-risk variable rate notes to third-party investors.

Upon issuance of a series of notes by Mona Lisa Re, all of the proceeds from the issuance are deposited into collateral accounts, separated by series, to fund any potential obligation under the reinsurance agreements entered into with Renaissance Reinsurance and/or DaVinci underlying such series of notes. The outstanding principal amount of each series of notes generally will be returned to holders of such notes upon the expiration of the risk period underlying such notes, unless an event occurs which causes a loss under the applicable series of notes, in which case the amount returned will be reduced by such noteholder’s pro rata share of such loss, as specified in the applicable governing documents of such notes.

In addition, holders of such notes are generally entitled to interest payments, payable quarterly, as determined by the applicable governing documents of each series of notes.

The Company concluded that Mona Lisa Re meets the definition of a VIE as it does not have sufficient equity capital to finance its activities. The Company evaluated its relationship with Mona Lisa Re and concluded it is not the primary beneficiary of Mona Lisa Re as it does not have the power over the activities that most significantly impact the economic performance of Mona Lisa Re, in accordance with the accounting guidance. As a result, the financial position and results of operations of Mona Lisa Re are not consolidated by the Company.

The only transactions related to Mona Lisa Re that are recorded in the Company’s consolidated financial statements are the ceded reinsurance agreements entered into by Renaissance Reinsurance and DaVinci which are accounted for as prospective reinsurance under FASB ASC Topic Financial Services - Insurance, and the fair value of the principal-at-risk variable rate notes owned by the Company. Other than its investment in the principal-at-risk variable rate notes of Mona Lisa Re, the Company has not provided financial or other support to Mona Lisa Re that it was not contractually required to provide.

Renaissance Reinsurance and DaVinci have together entered into ceded reinsurance contracts with Mona Lisa Re with ceded premiums written of $28.3 million and $6.4 million, respectively, during the three months ended March 31, 2021 (2020 - $24.3 million and $6.7 million, respectively). In addition, Renaissance Reinsurance and DaVinci recognized ceded premiums earned related to the ceded reinsurance contracts with Mona Lisa Re of $9.5 million and $1.7 million, respectively, during the three months ended March 31, 2021 (2020 - $24.3 million and $6.7 million, respectively).

At March 31, 2021, the total assets and total liabilities of Mona Lisa Re were $423.8 million and $423.8 million, respectively (December 31, 2020 - $400.3 million and $400.3 million, respectively).

The fair value of the Company’s investment in the principal-at-risk variable rate notes of Mona Lisa Re is included in other investments. Net of third-party investors, the fair value of the Company’s investment in Mona Lisa Re was $3.7 million at March 31, 2021 (December 31, 2020 - $3.7 million).

Fibonacci Re

Fibonacci Re provides collateralized capacity to Renaissance Reinsurance and its affiliates.

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 are recorded in the Company’s consolidated financial statements are 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.

Renaissance Reinsurance entered into ceded reinsurance contracts with Fibonacci Re with ceded premiums written of $Nil and ceded premiums earned of $Nil during the three months ended March 31, 2021 (2020 - $Nil and $Nil, respectively). During the three months ended March 31, 2021, Renaissance Reinsurance reduced its net claims and claim expenses ceded to Fibonacci Re by $Nil (2020 - ceded net claims and claim expenses of $1.1 million) and as of March 31, 2021 had a net reinsurance recoverable of $Nil from Fibonacci Re (December 31, 2020 - $Nil).

The fair value of the Company’s investment in the participating notes of Fibonacci Re is included in other investments. During 2020, all previously outstanding series of notes issued by Fibonacci Re were redeemed and the proceeds were returned to the holders of such notes. Net of third-party investors, the fair value of the Company’s investment in Fibonacci Re was $Nil at March 31, 2021 (December 31, 2020 - $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 March 31, 2021 the Company has invested $2.1 million in Langhorne Holdings (December 31, 2020 - $2.0 million), a company that owns and manages certain reinsurance entities within Langhorne. In addition, as of March 31, 2021 the Company has invested $0.1 million in Langhorne Partners (December 31, 2020 - $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

Shima Re was acquired on March 22, 2019 in connection with the acquisition of TMR. Shima Re is a Bermuda domiciled Class 3 insurer. Shima Re is registered as a segregated accounts company and provides third-party investors with access to reinsurance risk. The maximum remaining exposure of each segregated account is fully collateralized and is funded by cash or investments as prescribed by the participant thereto. Shima Re no longer writes new business and the last in-force contract written by Shima Re expired on December 31, 2019. The Company ceased providing management services to Shima Re effective December 1, 2020.

Shima Re is considered a VIE as it has voting rights that are not proportional to its participating rights. The Company evaluated its relationship with Shima 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 or its segregated accounts. The Company has not provided any financial or other support to any segregated account of Shima Re that it was not contractually required to provide.

Norwood Re

Until December 1, 2020, Norwood Re was managed by a subsidiary of RREAG that the Company acquired in the acquisition of TMR. Norwood Re is a Bermuda domiciled SPI registered as a segregated accounts company formed to provide solutions for reinsurance-linked asset investors. Norwood Re is wholly owned

by the Norwood Re Purpose Trust. Risks assumed by the segregated accounts of Norwood Re are fronted by or ceded from only one cedant - RREAG and/or its insurance affiliates. The obligations of each segregated account are funded through the issuance of non-voting preference shares to third-party investors. The maximum exposure of each segregated account is fully collateralized and is funded by cash and term deposits or investments as prescribed by the participant thereto. Norwood Re no longer writes new business, and the last in-force contract written by Norwood Re expired on June 30, 2020. The Company ceased providing management services to Norwood Re effective December 1, 2020.

Norwood Re is considered a VIE as it has voting rights that are not proportional to its participating rights. The Company evaluated its relationship with Norwood Re and concluded it is not the primary beneficiary of Norwood Re and its segregated accounts, as it does not have power over the activities that most significantly impact the economic performance of Norwood Re and its segregated accounts. As a result, the Company does not consolidate the financial position or results of operations of Norwood Re and its segregated accounts. The Company has not provided any financial or other support to Norwood Re that it was not contractually required to provide.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2021

Stockholders' Equity Note [Abstract]

Shareholders' Equity

SHAREHOLDERS’ EQUITY

Common Shares

On June 5, 2020, the Company issued 6,325,000 of its common shares in an underwritten public offering at a public offering price of $166.00 per share. Concurrently with the public offering, the Company raised $75.0 million through the issuance of 451,807 of its common shares at a price of $166.00 per share to State Farm Mutual Automobile Insurance Company, one of the Company’s existing stockholders, in a private placement. The total net proceeds from the offerings were $1.1 billion.

Series C 6.08% Preference Shares Redemption

The Series C 6.08% Preference Shares were redeemed on March 26, 2020 for $125.0 million plus accrued and unpaid dividends thereon. Following the redemption, no Series C 6.08% Preference Shares remain outstanding.

Dividends

The Board of Directors of RenaissanceRe declared a dividend of $0.36 per common share, payable to common shareholders of record on March 15, 2021, and the Company paid the dividend on March 31, 2021.

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 was 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), and was paid prior to the redemption in full of the Series C 6.08% shares on March 26, 2020. 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 three months ended March 31, 2021, the Company paid $7.3 million in preference share dividends (2020 - $9.1 million) and $17.8 million in common share dividends (2020 - $15.4 million).

Share Repurchases

The Company’s share repurchase program may be effected from time to time, depending on market conditions and other factors, through open market purchases and privately negotiated transactions. On February 5, 2021, 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 three months ended March 31, 2021, the Company repurchased 1,076,344 common shares in open market transactions at an aggregate cost of $171.6 million and an average price of $159.47 per common share. At March 31, 2021, $328.4 million remained available for repurchase under the share repurchase program.

Refer to Note 15. “Subsequent Events” for additional information related to common share repurchases subsequent to March 31, 2021.

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Earnings Per Share

3 Months Ended

Mar. 31, 2021

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
(common shares in thousands)	March 31, 2021		March 31, 2020
Numerator:
Net loss attributable to RenaissanceRe common shareholders	$	(290,934)	$	(81,974)
Amount allocated to participating common shareholders (1)	(129)		(146)
Net loss allocated to RenaissanceRe common shareholders	$	(291,063)	$	(82,120)
Denominator:
Denominator for basic loss per RenaissanceRe common share - weighted average common shares	49,579		43,441
Per common share equivalents of employee stock options and non-vested shares	—		—
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	49,579		43,441
Net loss attributable to RenaissanceRe common shareholders per common share – basic	$	(5.87)	$	(1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted	$	(5.87)	$	(1.89)

(1)Represents earnings and dividends attributable to holders of unvested shares issued pursuant to the Company's stock compensation plans.

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Segment Reporting

3 Months Ended

Mar. 31, 2021

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 and managed funds, 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 and managed funds. 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 and certain expenses related to acquisitions and disposals.

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 March 31, 2021	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,616,819		$	1,035,623		$	—	$	2,652,442
Net premiums written	$	1,008,460		$	815,623		$	—	$	1,824,083
Net premiums earned	$	605,166		$	548,670		$	—	$	1,153,836
Net claims and claim expenses incurred	498,832			368,219			—		867,051
Acquisition expenses	112,754			154,480			—		267,234
Operational expenses	35,375			19,936			—		55,311
Underwriting (loss) income	$	(41,795)		$	6,035		$	—	(35,760)
Net investment income							79,804		79,804
Net foreign exchange losses							(22,788)		(22,788)
Equity in earnings of other ventures							(5,558)		(5,558)
Other income							2,171		2,171
Net realized and unrealized losses on investments							(345,563)		(345,563)
Corporate expenses							(10,405)		(10,405)
Interest expense							(11,912)		(11,912)
Loss before taxes									(350,011)
Income tax benefit							19,516		19,516
Net loss attributable to redeemable noncontrolling interests							46,850		46,850
Dividends on preference shares							(7,289)		(7,289)
Net loss attributable to RenaissanceRe common shareholders									$	(290,934)
Net claims and claim expenses incurred – current accident year	$	503,994		$	372,089		$	—	$	876,083
Net claims and claim expenses incurred – prior accident years	(5,162)			(3,870)			—		(9,032)
Net claims and claim expenses incurred – total	$	498,832		$	368,219		$	—	$	867,051
Net claims and claim expense ratio – current accident year	83.3		%	67.8		%			75.9		%
Net claims and claim expense ratio – prior accident years	(0.9)		%	(0.7)		%			(0.8)		%
Net claims and claim expense ratio – calendar year	82.4		%	67.1		%			75.1		%
Underwriting expense ratio	24.5		%	31.8		%			28.0		%
Combined ratio	106.9		%	98.9		%			103.1		%

Three months ended March 31, 2020	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,220,526		$	805,195		$	—	$	2,025,721
Net premiums written	$	674,581		$	595,227		$	—	$	1,269,808
Net premiums earned	$	421,335		$	491,763		$	—	$	913,098
Net claims and claim expenses incurred	144,745			426,209			—		570,954
Acquisition expenses	85,351			125,253			—		210,604
Operational expenses	44,007			23,454			—		67,461
Underwriting income (loss)	$	147,232		$	(83,153)		$	—	64,079
Net investment income							99,473		99,473
Net foreign exchange losses							(5,728)		(5,728)
Equity in earnings of other ventures							4,564		4,564
Other loss							(4,436)		(4,436)
Net realized and unrealized losses on investments							(110,707)		(110,707)
Corporate expenses							(15,991)		(15,991)
Interest expense							(14,927)		(14,927)
Income before taxes									16,327
Income tax benefit							8,846		8,846
Net income attributable to redeemable noncontrolling interests							(98,091)		(98,091)
Dividends on preference shares							(9,056)		(9,056)
Net loss attributable to RenaissanceRe common shareholders									$	(81,974)
Net claims and claim expenses incurred – current accident year	$	130,844		$	426,210		$	—	$	557,054
Net claims and claim expenses incurred – prior accident years	13,901			(1)			—		13,900
Net claims and claim expenses incurred – total	$	144,745		$	426,209		$	—	$	570,954
Net claims and claim expense ratio – current accident year	31.1		%	86.7		%			61.0		%
Net claims and claim expense ratio – prior accident years	3.3		%	—		%			1.5		%
Net claims and claim expense ratio – calendar year	34.4		%	86.7		%			62.5		%
Underwriting expense ratio	30.7		%	30.2		%			30.5		%
Combined ratio	65.1		%	116.9		%			93.0		%

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Derivative Instruments

3 Months Ended

Mar. 31, 2021

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.

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 March 31, 2021	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	$	2,317	$	—	$	2,317	Other assets	$	—	$	2,317
Interest rate swaps	232		—		232		Other assets	—		232
Foreign currency forward contracts (1)	13,064		—		13,064		Other assets	—		13,064
Foreign currency forward contracts (2)	2,750		143		2,607		Other assets	—		2,607
Credit default swaps	211		—		211		Other assets	—		211
Total derivative instruments not designated as hedges	18,574		143		18,431			—		18,431
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,018		—		2,018		Other assets	—		2,018
Total	$	20,592	$	143	$	20,449		$	—	$	20,449
	Derivative Liabilities
At March 31, 2021	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	$	2,494	$	—	$	2,494	Other liabilities	$	2,494	$	—
Foreign currency forward contracts (1)	17,573		—		17,573		Other liabilities	—		17,573
Foreign currency forward contracts (2)	4,175		143		4,032		Other liabilities	—		4,032
Total derivative instruments not designated as hedges	24,242		143		24,099			2,494		21,605
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,365		—		2,365		Other liabilities	—		2,365
Total	$	26,607	$	143	$	26,464		$	2,494	$	23,970

(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 net investments in foreign operations.

	Derivative Assets
At December 31, 2020	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	$	1,019	$	863	$	156	Other assets	$	—	$	156
Interest rate swaps	22		—		22		Other assets	—		22
Foreign currency forward contracts (1)	23,055		184		22,871		Other assets	—		22,871
Foreign currency forward contracts (2)	2,232		69		2,163		Other assets	—		2,163
Credit default swaps	68		—		68		Other assets	—		68
Total derivative instruments not designated as hedges	26,396		1,116		25,280			—		25,280
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	19,953		—		19,953		Other assets	—		19,953
Total	$	46,349	$	1,116	$	45,233		$	—	$	45,233
	Derivative Liabilities
At December 31, 2020	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	$	1,430	$	863	$	567	Other liabilities	$	567	$	—
Foreign currency forward contracts (1)	12,791		—		12,791		Other liabilities	—		12,791
Foreign currency forward contracts (2)	3,919		69		3,850		Other liabilities	1,053		2,797
Total derivative instruments not designated as hedges	18,140		932		17,208			1,620		15,588
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	5,152		—		5,152		Other liabilities	—		5,152
Total	$	23,292	$	932	$	22,360		$	1,620	$	20,740

(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 net investments in foreign operations.

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 March 31		2021		2020
Derivative instruments not designated as hedges
Interest rate futures	Net realized and unrealized losses on investments	$	15,507	$	88,006
Interest rate swaps	Net realized and unrealized losses on investments	(901)		2,107
Foreign currency forward contracts (1)	Net foreign exchange losses	(3,641)		(330)
Foreign currency forward contracts (2)	Net foreign exchange losses	(5,061)		6,400
Credit default swaps	Net realized and unrealized losses on investments	255		(4,897)
Total return swaps	Net realized and unrealized losses on investments	—		(21,137)
Equity futures	Net realized and unrealized losses on investments	—		(30,898)
Total derivative instruments not designated as hedges		6,159		39,251
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	Accumulated other comprehensive loss	(2,089)		10,844
Total derivative instruments designated as hedges		(2,089)		10,844
Total		$	4,070	$	50,095

(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 net investments in foreign operations.

The Company is not aware of the existence of any credit-risk related contingent features that it believes would be triggered in its derivative instruments that are in a net liability position at March 31, 2021.

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 March 31, 2021, the Company had $1.8 billion of notional long positions and $0.9 billion of notional short positions of primarily Eurodollar and U.S. treasury futures contracts (December 31, 2020 - $2.0 billion and $1.0 billion, 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 March 31, 2021, the Company had $Nil of notional positions paying a fixed rate and $20.2 million receiving a fixed rate denominated in U.S. dollar swap contracts (December 31, 2020 - $Nil and $23.5 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 enter into foreign currency forward and option contracts for notional values that approximate the foreign currency liabilities, including claims and claim expense reserves and reinsurance balances payable, net of any cash, investments and receivables held in the respective foreign currency. The Company's use of foreign currency forward and option contracts is intended 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 Company may determine not to match a portion of its projected underwriting related assets or liabilities with underlying foreign currency exposure with investments in the same currencies, which would increase its exposure to foreign currency fluctuations and potentially increase the impact and volatility of foreign exchange gains and losses on its results of 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 March 31, 2021, the Company had outstanding underwriting related foreign currency contracts of $843.3 million in notional long positions and $355.6 million in notional short positions, denominated in U.S. dollars (December 31, 2020 - $661.4 million and $504.2 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 March 31, 2021, the Company had outstanding investment portfolio related foreign currency contracts of $265.5 million in notional long positions and $139.3 million in notional short positions, denominated in U.S. dollars (December 31, 2020 - $269.5 million and $117.5 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 March 31, 2021, the Company had outstanding credit default swaps of $25.0 million in notional positions to hedge credit risk and $77.9 million in notional positions to assume credit risk, denominated in U.S. dollars (December 31, 2020 - $Nil and $96.8 million, respectively).

Total Return Swaps

From time to time, 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 March 31, 2021 and December 31, 2020, the Company had no outstanding total return swaps, respectively.

Equity Derivatives

Equity Futures

From time to time, 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 March 31, 2021 and December 31, 2020, the Company had no outstanding equity futures, respectively.

Derivative Instruments Designated as Hedges of Net Investments in Foreign Operations

Foreign Currency Derivatives

Hedges of Net Investments in Foreign Operations

Certain of the Company’s subsidiaries use non-U.S. dollar functional currencies. The Company, from time to time, enters into foreign exchange forwards to hedge currencies, which currently includes the Australian dollar and Euro net investment in foreign operations, on an after-tax basis, from changes in the exchange rate between the U.S. dollar and these currencies.

The Company utilizes foreign exchange forward contracts to hedge the fair value of its net investment in a foreign operation. The Company has entered into foreign exchange forward contracts that were formally designated as hedges of its investment in subsidiaries with non-U.S. dollar functional currencies. There was no ineffectiveness in these transactions.

The table below provides a summary of derivative instruments designated as hedges of net investments in foreign operations, including the weighted average U.S. dollar equivalent of foreign denominated net (liabilities) assets that were hedged and the resulting derivative (losses) gains that are recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive (loss) income on the Company’s consolidated statements of changes in shareholders’ equity:

	Three months ended
	March 31, 2021		March 31, 2020
Weighted average of U.S. dollar equivalent of foreign denominated net (liabilities) assets	$	(97,219)	$	76,804
Derivative (losses) gains (1)	$	(2,089)	$	10,844

(1)    Derivative (losses) 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) income on the Company’s consolidated statements of changes in shareholders’ equity.

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Commitments, Contingencies and Other Items

3 Months Ended

Mar. 31, 2021

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, 2020.

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.

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Subsequent Events

3 Months Ended

Mar. 31, 2021

Subsequent Events [Abstract]

Subsequent Events

SUBSEQUENT EVENTS

Effective April 1, 2021, the Company raised over $100.0 million of capital through Medici. Following this transaction, the Company’s ownership in Medici was 13.7%.

Subsequent to March 31, 2021 and through the period ended April 23, 2021, we repurchased 330 thousand common shares in open market transactions at an aggregate cost of $55.3 million and an average price of $167.62 per common share.

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Significant Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2021

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 recoverable and premiums receivable, including provisions for reinsurance recoverable and premiums receivable to reflect expected credit losses; estimates of written and earned premiums; fair value, including the fair value of investments, financial instruments and derivatives; impairment charges; deferred acquisition costs and the value of business acquired and the Company’s deferred tax valuation allowance.

Recently Adopted Accounting Pronouncements

RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (”ASU 2019-12”). Among other things, ASU 2019-12 eliminates certain exceptions for recognizing deferred taxes for investments, performing intraperiod tax allocation and calculating income taxes in interim periods. ASU 2019-12 also clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. ASU 2019-12 is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Accordingly, the Company adopted ASU 2019-12 effective January 1, 2021. The adoption of ASU 2019-12 did not have a material impact on the Company’s consolidated statements of operations and financial position.

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Investments (Tables)

3 Months Ended

Mar. 31, 2021

Investments [Abstract]

Schedule of Fair Value of Fixed Maturity and Equity Investments Trading

The following table summarizes the fair value of fixed maturity investments trading:

	March 31, 2021		December 31, 2020
U.S. treasuries	$	5,107,878	$	4,960,409
Agencies	227,184		368,032
Non-U.S. government	518,162		491,531
Non-U.S. government-backed corporate	335,662		338,014
Corporate	4,289,072		4,261,025
Agency mortgage-backed	957,563		1,113,792
Non-agency mortgage-backed	272,529		291,444
Commercial mortgage-backed	713,044		791,272
Asset-backed	888,140		890,984
Total fixed maturity investments trading	$	13,309,234	$	13,506,503

The following table summarizes the fair value of equity investments trading:

	March 31, 2021		December 31, 2020
Financials	$	241,360	$	452,765
Communications and technology	123,204		119,592
Consumer	45,586		44,477
Industrial, utilities and energy	48,935		43,380
Healthcare	36,248		35,140
Basic materials	7,804		7,263
Total	$	503,137	$	702,617

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.

March 31, 2021	Amortized  Cost		Fair Value
Due in less than one year	$	568,444	$	572,443
Due after one through five years	5,498,414		5,569,638
Due after five through ten years	3,822,345		3,786,423
Due after ten years	562,618		549,453
Mortgage-backed	1,922,325		1,943,137
Asset-backed	884,839		888,140
Total	$	13,258,985	$	13,309,234

Schedule of Net Investment Income

The components of net investment income are as follows:

	Three months ended
	March 31, 2021		March 31, 2020
Fixed maturity investments	$	62,933	$	73,338
Short term investments	573		12,092
Equity investments	1,491		1,551
Other investments
Catastrophe bonds	14,468		14,139
Other	3,801		1,629
Cash and cash equivalents	102		1,504
	83,368		104,253
Investment expenses	(3,564)		(4,780)
Net investment income	$	79,804	$	99,473

Schedule of Net Realized and Unrealized Gains (Losses)

Net realized and unrealized losses on investments are as follows:

	Three months ended
	March 31, 2021		March 31, 2020
Net realized gains on fixed maturity investments trading	$	20,398	$	57,487
Net unrealized losses on fixed maturity investments trading	(297,018)		(20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)		37,142
Net realized and unrealized gains on investments-related derivatives	14,861		33,181
Net realized gains (losses) on equity investments trading	109,887		(15,047)
Net unrealized losses on equity investments trading	(177,809)		(105,937)
Net realized and unrealized losses on equity investments trading	(67,922)		(120,984)
Net realized and unrealized losses on other investments - catastrophe bonds	(19,083)		(14,352)
Net realized and unrealized gains (losses) on other investments - other	3,201		(45,694)
Net realized and unrealized losses on investments	$	(345,563)	$	(110,707)

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021	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	$	5,107,878	$	5,107,878	$	—	$	—
Agencies	227,184		—		227,184		—
Non-U.S. government	518,162		—		518,162		—
Non-U.S. government-backed corporate	335,662		—		335,662		—
Corporate	4,289,072		—		4,289,072		—
Agency mortgage-backed	957,563		—		957,563		—
Non-agency mortgage-backed	272,529		—		272,529		—
Commercial mortgage-backed	713,044		—		713,044		—
Asset-backed	888,140		—		888,140		—
Total fixed maturity investments	13,309,234		5,107,878		8,201,356		—
Short term investments	5,091,143		—		5,091,143		—
Equity investments trading	503,137		503,137		—		—
Other investments
Catastrophe bonds	941,604		—		941,604		—
Private equity investments	75,874		—		—		75,874
	1,017,478		—		941,604		75,874
Fund investments (1)	361,578
Total other investments	1,379,056		—		941,604		75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,421)		—		—		(6,421)
Derivative assets (3)	20,449		2,317		18,132		—
Derivative liabilities (3)	(26,464)		(2,494)		(23,970)		—
Total other assets and (liabilities)	(12,436)		(177)		(5,838)		(6,421)
	$	20,270,134	$	5,610,838	$	14,228,265	$	69,453

(1)    Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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 March 31, 2021 was $0.6 million of other assets and $7.0 million of other liabilities.

(3)    See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

At December 31, 2020	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	$	4,960,409	$	4,960,409	$	—	$	—
Agencies	368,032		—		368,032		—
Non-U.S. government	491,531		—		491,531		—
Non-U.S. government-backed corporate	338,014		—		338,014		—
Corporate	4,261,025		—		4,261,025		—
Agency mortgage-backed	1,113,792		—		1,113,792		—
Non-agency mortgage-backed	291,444		—		291,444		—
Commercial mortgage-backed	791,272		—		791,272		—
Asset-backed	890,984		—		890,984		—
Total fixed maturity investments	13,506,503		4,960,409		8,546,094		—
Short term investments	4,993,735		—		4,993,735		—
Equity investments trading	702,617		702,617		—		—
Other investments
Catastrophe bonds	881,290		—		881,290		—
Private equity investments	79,807		—		—		79,807
	961,097		—		881,290		79,807
Fund investments (1)	295,851
Total other investments	1,256,948		—		881,290		79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts (2)	(6,211)		—		—		(6,211)
Derivative assets (3)	45,233		156		45,077		—
Derivative liabilities (3)	(22,360)		(567)		(21,793)		—
Total other assets and (liabilities)	16,662		(411)		23,284		(6,211)
	$	20,476,465	$	5,662,615	$	14,444,403	$	73,596

(1)     Fund investments, which are comprised of private equity funds, senior secured bank loan funds and hedge funds, are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and 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, 2020 was $1.4 million of other assets and $7.6 million of other liabilities.

(3)     See “Note 13. Derivative Instruments” for additional information related to the fair value, by type of contract, of derivatives entered into by the Company.

Schedule of Quantitative Information Used as Level 3 Inputs

Below is a summary of quantitative information regarding the significant unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis:

At March 31, 2021	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	75,874	Internal valuation model	Discount rate	n/a	n/a	9.0%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	75,874
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(168)		Internal valuation model	Bond price	n/a	n/a	$	99.51
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(6,849)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,895
				Expected loss ratio	n/a	n/a	21.9		%
				Discount rate	n/a	n/a	0.9		%
Assumed and ceded (re)insurance contracts	596		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,421)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	69,453

At December 31, 2020	Fair Value (Level 3)		Valuation Technique	Unobservable Inputs	Low	High	Weighted Average or Actual
Other investments
Private equity investment	$	79,807	Internal valuation model	Discount rate	n/a	n/a	9.0		%
				Liquidity discount	n/a	n/a	15.0		%
Total other investments	79,807
Other assets and (liabilities)
Assumed and ceded (re)insurance contracts	(190)		Internal valuation model	Bond price	n/a	n/a	$	99.31
				Liquidity discount	n/a	n/a	1.3		%
Assumed and ceded (re)insurance contracts	(7,395)		Internal valuation model	Net undiscounted cash flows	n/a	n/a	$	12,514
				Expected loss ratio	n/a	n/a	24.0		%
				Discount rate	n/a	n/a	0.4		%
Assumed and ceded (re)insurance contracts	1,374		Internal valuation model	Expected loss ratio	n/a	n/a	0.0		%
Total other assets and (liabilities)	(6,211)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	$	73,596

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 - January 1, 2021	$	79,807	$	(6,211)	$	73,596
Total realized and unrealized losses
Included in net realized and unrealized losses on investments	(3,936)		—		(3,936)
Included in other income (loss)	—		96		96
Total foreign exchange gains	3		—		3
Purchases	—		(306)		(306)
Sales	—		—		—
Balance - March 31, 2021	$	75,874	$	(6,421)	$	69,453

	Other investments		Other assets  and (liabilities)		Total
Balance - January 1, 2020	$	74,634	$	4,731	$	79,365
Total realized and unrealized losses
Included in net realized and unrealized gains on investments	(14,156)		—		(14,156)
Included in other income (loss)	—		(2,897)		(2,897)
Total foreign exchange losses	(21)		—		(21)
Purchases	20,962		(611)		20,351
Sales	(8,799)		—		(8,799)
Balance - March 31, 2020	$	72,620	$	1,223	$	73,843

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 - January 1, 2021	$	79,807	$	(6,211)	$	73,596
Total realized and unrealized losses
Included in net realized and unrealized losses on investments	(3,936)		—		(3,936)
Included in other income (loss)	—		96		96
Total foreign exchange gains	3		—		3
Purchases	—		(306)		(306)
Sales	—		—		—
Balance - March 31, 2021	$	75,874	$	(6,421)	$	69,453

	Other investments		Other assets  and (liabilities)		Total
Balance - January 1, 2020	$	74,634	$	4,731	$	79,365
Total realized and unrealized losses
Included in net realized and unrealized gains on investments	(14,156)		—		(14,156)
Included in other income (loss)	—		(2,897)		(2,897)
Total foreign exchange losses	(21)		—		(21)
Purchases	20,962		(611)		20,351
Sales	(8,799)		—		(8,799)
Balance - March 31, 2020	$	72,620	$	1,223	$	73,843

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:

	March 31, 2021		December 31, 2020
Other investments	$	1,379,056	$	1,256,948
Other assets	$	6,437	$	8,982
Other liabilities	$	12,858	$	15,193

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 March 31, 2021	Fair Value		Unfunded Commitments		Redemption Frequency	Redemption Notice Period (Minimum Days)	Redemption Notice Period (Maximum Days)
Private equity funds	$	333,910	$	1,031,629	See below	See below	See below
Senior secured bank loan funds	16,886		7,920		See below	See below	See below
Hedge funds	10,782		—		See below	See below	See below
Total other investments measured using net asset valuations	$	361,578	$	1,039,549

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Reinsurance (Tables)

3 Months Ended

Mar. 31, 2021

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
	March 31, 2021		March 31, 2020
Premiums written
Direct	$	225,139	$	147,692
Assumed	2,427,303		1,878,029
Ceded	(828,359)		(755,913)
Net premiums written	$	1,824,083	$	1,269,808
Premiums earned
Direct	$	162,089	$	134,229
Assumed	1,416,646		1,149,733
Ceded	(424,899)		(370,864)
Net premiums earned	$	1,153,836	$	913,098
Claims and claim expenses
Gross claims and claim expenses incurred	$	1,250,246	$	747,715
Claims and claim expenses recovered	(383,195)		(176,761)
Net claims and claim expenses incurred	$	867,051	$	570,954

Schedule of Activity in the Allowance Recorded Against Premium Receivables

The following table provides a roll forward of the provision for current expected credit losses of the Company’s premiums receivable:

Three months ended March 31	2021
Beginning balance	$	5,961
Provision for allowance	(2,179)
Ending balance	$	3,782

Schedule of Activity in the Allowance Recorded Against Reinsurance Recoverable

The following table provides a roll forward of the provision for current expected credit losses of the Company’s reinsurance recoverable:

Three months ended March 31	2021
Beginning balance	$	6,334
Provision for allowance	271
Ending balance	$	6,605

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Reserve for Claims and Claim Expenses (Tables)

3 Months Ended

Mar. 31, 2021

Insurance Loss Reserves [Abstract]

Schedule of Liability for Unpaid Claims and Claim Expenses

The following table summarizes the Company’s claims and claim expense reserves by segment, allocated between case reserves, additional case reserves and IBNR:

At March 31, 2021	Case Reserves		Additional Case Reserves		IBNR		Total
Property	$	1,292,683	$	1,333,734	$	2,145,953	$	4,772,370
Casualty and Specialty	1,801,362		147,822		4,231,829		6,181,013
Total	$	3,094,045	$	1,481,556	$	6,377,782	$	10,953,383
At December 31, 2020
Property	$	1,127,909	$	1,617,003	$	1,627,541	$	4,372,453
Casualty and Specialty	1,651,150		133,843		4,223,692		6,008,685
Total	$	2,779,059	$	1,750,846	$	5,851,233	$	10,381,138

Activity in the liability for unpaid claims and claim expenses is summarized as follows:

Three months ended March 31	2021		2020
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period	$	7,455,128	$	6,593,052
Net incurred related to:
Current year	876,083		557,054
Prior years	(9,032)		13,900
Total net incurred	867,051		570,954
Net paid related to:
Current year	14,751		31,201
Prior years	486,488		436,286
Total net paid	501,239		467,487
Foreign exchange (1)	(28,224)		(55,395)
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period	7,792,716		6,641,124
Reinsurance recoverable as of end of period	3,160,667		2,765,583
Reserve for claims and claim expenses as of end of period	$	10,953,383	$	9,406,707

(1)    Reflects the impact of the foreign exchange revaluation of the net reserve for claims and claim expenses denominated in non-U.S. dollars as at the balance sheet date.

The following table details the Company’s prior year net development by segment of its liability for unpaid claims and claim expenses:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Property	$	(5,162)	$	13,901
Casualty and Specialty	(3,870)		(1)
Total net (favorable) adverse development of prior accident years net claims and claim expenses	$	(9,032)	$	13,900

The following tables detail the development of the Company’s liability for net 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:

Three months ended March 31	2021
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	(4,742)
2018 Large Loss Events	(3,263)
2017 Large Loss Events	(5,508)
Other	(679)
Total large catastrophe events	(14,192)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	9,030
Total small catastrophe events and attritional loss movements	9,030
Total catastrophe and attritional net claims and claim expenses	(5,162)
Total net favorable development of prior accident years net claims and claim expenses	$	(5,162)

Three months ended March 31	2020
	(Favorable) adverse development
Catastrophe net claims and claim expenses
Large catastrophe events
2019 Large Loss Events	$	(19,681)
2018 Large Loss Events	(14,200)
2017 Large Loss Events	(6,237)
Other	8,027
Total large catastrophe events	(32,091)
Small catastrophe events and attritional loss movements
Other small catastrophe events and attritional loss movements	45,992
Total small catastrophe events and attritional loss movements	45,992
Total net adverse development of prior accident years net claims and claim expenses	$	13,901

The following table details the development of the Company’s liability for unpaid claims and claim expenses for its Casualty and Specialty segment:

Three months ended March 31	2021		2020
	(Favorable) adverse development		(Favorable) adverse development
Actuarial methods - actual reported claims less than expected claims	$	(3,870)	$	(1)
Total net favorable development of prior accident years net claims and claim expenses	$	(3,870)	$	(1)

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Debt and Credit Facilities (Tables)

3 Months Ended

Mar. 31, 2021

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:

	March 31, 2021				December 31, 2020
	Fair Value		Carrying Value		Fair Value		Carrying Value
3.600% Senior Notes due 2029	$	431,360	$	392,619	$	453,932	$	392,391
3.450% Senior Notes due 2027	323,262		296,909		329,661		296,787
3.700% Senior Notes due 2025	310,881		298,519		315,273		298,428
4.750% Senior Notes due 2025 (DaVinciRe) (1)	165,746		148,736		162,203		148,659
Total debt	$	1,231,249	$	1,136,783	$	1,261,069	$	1,136,265

(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 March 31, 2021	Issued or Drawn
Revolving Credit Facility (1)	$	—
Bilateral Letter of Credit Facilities
Secured	392,116
Unsecured	488,532
Funds at Lloyd’s Letter of Credit Facility	225,000
	$	1,105,648

(1)     At March 31, 2021, no amounts were issued or drawn under this facility.

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Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2021

Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest [Abstract]

Schedule of Redeemable Noncontrolling Interest

A summary of the Company’s redeemable noncontrolling interests on its consolidated balance sheets is set forth below:

	March 31, 2021		December 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	1,555,714	$	1,560,693
Redeemable noncontrolling interest - Medici	737,702		717,999
Redeemable noncontrolling interest - Vermeer	1,116,154		1,109,627
Redeemable noncontrolling interests	$	3,409,570	$	3,388,319

A summary of the Company’s redeemable noncontrolling interests on its consolidated statements of operations is set forth below:

	Three months ended
	March 31, 2021		March 31, 2020
Redeemable noncontrolling interest - DaVinciRe	$	(39,934)	$	84,906
Redeemable noncontrolling interest - Medici	(13,443)		(4,678)
Redeemable noncontrolling interest - Vermeer	6,527		17,863
Net (loss) income attributable to redeemable noncontrolling interests	$	(46,850)	$	98,091

The activity in redeemable noncontrolling interest – DaVinciRe is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	1,560,693	$	1,435,581
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(155,971)		2,607
Sale of shares to redeemable noncontrolling interests	190,926		9,991
Net (loss) income attributable to redeemable noncontrolling interest	(39,934)		84,906
Ending balance	$	1,555,714	$	1,533,085

The activity in redeemable noncontrolling interest – Medici is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	717,999	$	632,112
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(7,699)		(4,764)
Sale of shares to redeemable noncontrolling interests	40,845		54,613
Net loss attributable to redeemable noncontrolling interest	(13,443)		(4,678)
Ending balance	$	737,702	$	677,283

The activity in redeemable noncontrolling interest – Vermeer is detailed in the table below:

	Three months ended
	March 31, 2021		March 31, 2020
Beginning balance	$	1,109,627	$	1,003,615
Net income attributable to redeemable noncontrolling interest	6,527		17,863
Ending balance	$	1,116,154	$	1,021,478

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

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
(common shares in thousands)	March 31, 2021		March 31, 2020
Numerator:
Net loss attributable to RenaissanceRe common shareholders	$	(290,934)	$	(81,974)
Amount allocated to participating common shareholders (1)	(129)		(146)
Net loss allocated to RenaissanceRe common shareholders	$	(291,063)	$	(82,120)
Denominator:
Denominator for basic loss per RenaissanceRe common share - weighted average common shares	49,579		43,441
Per common share equivalents of employee stock options and non-vested shares	—		—
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	49,579		43,441
Net loss attributable to RenaissanceRe common shareholders per common share – basic	$	(5.87)	$	(1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted	$	(5.87)	$	(1.89)

(1)Represents earnings and dividends attributable to holders of unvested shares issued pursuant to the Company's stock compensation plans.

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,616,819		$	1,035,623		$	—	$	2,652,442
Net premiums written	$	1,008,460		$	815,623		$	—	$	1,824,083
Net premiums earned	$	605,166		$	548,670		$	—	$	1,153,836
Net claims and claim expenses incurred	498,832			368,219			—		867,051
Acquisition expenses	112,754			154,480			—		267,234
Operational expenses	35,375			19,936			—		55,311
Underwriting (loss) income	$	(41,795)		$	6,035		$	—	(35,760)
Net investment income							79,804		79,804
Net foreign exchange losses							(22,788)		(22,788)
Equity in earnings of other ventures							(5,558)		(5,558)
Other income							2,171		2,171
Net realized and unrealized losses on investments							(345,563)		(345,563)
Corporate expenses							(10,405)		(10,405)
Interest expense							(11,912)		(11,912)
Loss before taxes									(350,011)
Income tax benefit							19,516		19,516
Net loss attributable to redeemable noncontrolling interests							46,850		46,850
Dividends on preference shares							(7,289)		(7,289)
Net loss attributable to RenaissanceRe common shareholders									$	(290,934)
Net claims and claim expenses incurred – current accident year	$	503,994		$	372,089		$	—	$	876,083
Net claims and claim expenses incurred – prior accident years	(5,162)			(3,870)			—		(9,032)
Net claims and claim expenses incurred – total	$	498,832		$	368,219		$	—	$	867,051
Net claims and claim expense ratio – current accident year	83.3		%	67.8		%			75.9		%
Net claims and claim expense ratio – prior accident years	(0.9)		%	(0.7)		%			(0.8)		%
Net claims and claim expense ratio – calendar year	82.4		%	67.1		%			75.1		%
Underwriting expense ratio	24.5		%	31.8		%			28.0		%
Combined ratio	106.9		%	98.9		%			103.1		%

Three months ended March 31, 2020	Property			Casualty and Specialty			Other		Total
Gross premiums written	$	1,220,526		$	805,195		$	—	$	2,025,721
Net premiums written	$	674,581		$	595,227		$	—	$	1,269,808
Net premiums earned	$	421,335		$	491,763		$	—	$	913,098
Net claims and claim expenses incurred	144,745			426,209			—		570,954
Acquisition expenses	85,351			125,253			—		210,604
Operational expenses	44,007			23,454			—		67,461
Underwriting income (loss)	$	147,232		$	(83,153)		$	—	64,079
Net investment income							99,473		99,473
Net foreign exchange losses							(5,728)		(5,728)
Equity in earnings of other ventures							4,564		4,564
Other loss							(4,436)		(4,436)
Net realized and unrealized losses on investments							(110,707)		(110,707)
Corporate expenses							(15,991)		(15,991)
Interest expense							(14,927)		(14,927)
Income before taxes									16,327
Income tax benefit							8,846		8,846
Net income attributable to redeemable noncontrolling interests							(98,091)		(98,091)
Dividends on preference shares							(9,056)		(9,056)
Net loss attributable to RenaissanceRe common shareholders									$	(81,974)
Net claims and claim expenses incurred – current accident year	$	130,844		$	426,210		$	—	$	557,054
Net claims and claim expenses incurred – prior accident years	13,901			(1)			—		13,900
Net claims and claim expenses incurred – total	$	144,745		$	426,209		$	—	$	570,954
Net claims and claim expense ratio – current accident year	31.1		%	86.7		%			61.0		%
Net claims and claim expense ratio – prior accident years	3.3		%	—		%			1.5		%
Net claims and claim expense ratio – calendar year	34.4		%	86.7		%			62.5		%
Underwriting expense ratio	30.7		%	30.2		%			30.5		%
Combined ratio	65.1		%	116.9		%			93.0		%

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Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021	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	$	2,317	$	—	$	2,317	Other assets	$	—	$	2,317
Interest rate swaps	232		—		232		Other assets	—		232
Foreign currency forward contracts (1)	13,064		—		13,064		Other assets	—		13,064
Foreign currency forward contracts (2)	2,750		143		2,607		Other assets	—		2,607
Credit default swaps	211		—		211		Other assets	—		211
Total derivative instruments not designated as hedges	18,574		143		18,431			—		18,431
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,018		—		2,018		Other assets	—		2,018
Total	$	20,592	$	143	$	20,449		$	—	$	20,449
	Derivative Liabilities
At March 31, 2021	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	$	2,494	$	—	$	2,494	Other liabilities	$	2,494	$	—
Foreign currency forward contracts (1)	17,573		—		17,573		Other liabilities	—		17,573
Foreign currency forward contracts (2)	4,175		143		4,032		Other liabilities	—		4,032
Total derivative instruments not designated as hedges	24,242		143		24,099			2,494		21,605
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	2,365		—		2,365		Other liabilities	—		2,365
Total	$	26,607	$	143	$	26,464		$	2,494	$	23,970

(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 net investments in foreign operations.

	Derivative Assets
At December 31, 2020	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	$	1,019	$	863	$	156	Other assets	$	—	$	156
Interest rate swaps	22		—		22		Other assets	—		22
Foreign currency forward contracts (1)	23,055		184		22,871		Other assets	—		22,871
Foreign currency forward contracts (2)	2,232		69		2,163		Other assets	—		2,163
Credit default swaps	68		—		68		Other assets	—		68
Total derivative instruments not designated as hedges	26,396		1,116		25,280			—		25,280
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	19,953		—		19,953		Other assets	—		19,953
Total	$	46,349	$	1,116	$	45,233		$	—	$	45,233
	Derivative Liabilities
At December 31, 2020	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	$	1,430	$	863	$	567	Other liabilities	$	567	$	—
Foreign currency forward contracts (1)	12,791		—		12,791		Other liabilities	—		12,791
Foreign currency forward contracts (2)	3,919		69		3,850		Other liabilities	1,053		2,797
Total derivative instruments not designated as hedges	18,140		932		17,208			1,620		15,588
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	5,152		—		5,152		Other liabilities	—		5,152
Total	$	23,292	$	932	$	22,360		$	1,620	$	20,740

(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 net investments in foreign operations.

Schedule of Gain (Loss) Recognized in Consolidated Statements of Operations Related to Principal Derivative Instruments

The location and amount of the gain (loss) recognized in the Company’s consolidated statements of operations related to its principal derivative instruments are shown in the following table:

	Location of gain (loss) recognized on derivatives	Amount of gain (loss) recognized on derivatives
Three months ended March 31		2021		2020
Derivative instruments not designated as hedges
Interest rate futures	Net realized and unrealized losses on investments	$	15,507	$	88,006
Interest rate swaps	Net realized and unrealized losses on investments	(901)		2,107
Foreign currency forward contracts (1)	Net foreign exchange losses	(3,641)		(330)
Foreign currency forward contracts (2)	Net foreign exchange losses	(5,061)		6,400
Credit default swaps	Net realized and unrealized losses on investments	255		(4,897)
Total return swaps	Net realized and unrealized losses on investments	—		(21,137)
Equity futures	Net realized and unrealized losses on investments	—		(30,898)
Total derivative instruments not designated as hedges		6,159		39,251
Derivative instruments designated as hedges
Foreign currency forward contracts (3)	Accumulated other comprehensive loss	(2,089)		10,844
Total derivative instruments designated as hedges		(2,089)		10,844
Total		$	4,070	$	50,095

(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 net investments in foreign operations.

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 net investments in foreign operations, including the weighted average U.S. dollar equivalent of foreign denominated net (liabilities) assets that were hedged and the resulting derivative (losses) gains that are recorded in foreign currency translation adjustments, net of tax, within accumulated other comprehensive (loss) income on the Company’s consolidated statements of changes in shareholders’ equity:

	Three months ended
	March 31, 2021		March 31, 2020
Weighted average of U.S. dollar equivalent of foreign denominated net (liabilities) assets	$	(97,219)	$	76,804
Derivative (losses) gains (1)	$	(2,089)	$	10,844

(1)    Derivative (losses) 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) income on the Company’s consolidated statements of changes in shareholders’ equity.

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Investments (Schedule of Fair Value of Fixed Maturity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 13,309,234	$ 13,506,503
U.S. treasuries
Schedule of Investments [Line Items]
Total fixed maturity investments trading	5,107,878	4,960,409
Agencies
Schedule of Investments [Line Items]
Total fixed maturity investments trading	227,184	368,032
Non-U.S. government
Schedule of Investments [Line Items]
Total fixed maturity investments trading	518,162	491,531
Non-U.S. government-backed corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	335,662	338,014
Corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	4,289,072	4,261,025
Agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	957,563	1,113,792
Non-agency mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	272,529	291,444
Commercial mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	713,044	791,272
Asset-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 888,140	$ 890,984

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Investments (Schedule of Contractual Maturities of Fixed Maturity Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized  Cost
Due in less than one year	$ 568,444
Due after one through five years	5,498,414
Due after five through ten years	3,822,345
Due after ten years	562,618
Amortized Cost	13,258,985	$ 13,155,035
Fair Value
Due in less than one year	572,443
Due after one through five years	5,569,638
Due after five through ten years	3,786,423
Due after ten years	549,453
Fixed maturity investments	13,309,234	13,506,503
Mortgage-backed
Amortized  Cost
Amortized Cost	1,922,325
Fair Value
Fixed maturity investments	1,943,137
Asset-backed
Amortized  Cost
Amortized Cost	884,839
Fair Value
Fixed maturity investments	$ 888,140	$ 890,984

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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 503,137	$ 702,617
Financials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	241,360	452,765
Communications and technology
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	123,204	119,592
Consumer
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	45,586	44,477
Industrial, utilities and energy
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	48,935	43,380
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	36,248	35,140
Basic materials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 7,804	$ 7,263

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Investments (Pledged Investments) (Details) - USD ($) $ in Billions	Mar. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties	$ 8.4	$ 8.1
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities	$ 2.5	$ 2.5

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Investments (Reverse Purchase Agreements) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Value of reverse repurchase agreements	$ 25.0	$ 126.5
Minimum required collateral for reverse repurchase agreements, expressed as a percentage of loan principal	102.00%

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Investments (Schedule of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 83,368	$ 104,253
Investment expenses	(3,564)	(4,780)
Net investment income	79,804	99,473
Fixed maturity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	62,933	73,338
Short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	573	12,092
Equity investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	1,491	1,551
Catastrophe bonds
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	14,468	14,139
Other
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	3,801	1,629
Cash and cash equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment income before investment expenses	$ 102	$ 1,504

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Investments (Schedule of Net Realized and Unrealized Losses on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Gain (Loss) on Securities [Line Items]
Net realized and unrealized losses on investments	$ (345,563)	$ (110,707)
Fixed maturity investments
Gain (Loss) on Securities [Line Items]
Net realized gains on fixed maturity investments trading	20,398	57,487
Net unrealized losses on fixed maturity investments trading	(297,018)	(20,345)
Net realized and unrealized (losses) gains on fixed maturity investments trading	(276,620)	37,142
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains on investments-related derivatives	14,861	33,181
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments trading	109,887	(15,047)
Net unrealized losses on equity investments trading	(177,809)	(105,937)
Net realized and unrealized losses on equity investments trading	(67,922)	(120,984)
Catastrophe bonds | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	(19,083)	(14,352)
Other | Other investments
Gain (Loss) on Securities [Line Items]
Net realized and unrealized (losses) gains on other investments	$ 3,201	$ (45,694)

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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	$ 13,309,234	$ 13,506,503
Short term investments	5,091,143	4,993,735
Equity investments trading	503,137	702,617
Other investments	1,379,056	1,256,948
Derivative assets	20,449	45,233
Derivative liabilities	(26,464)	(22,360)
Other assets	6,437	8,982
Other liabilities	(12,858)	(15,193)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	13,309,234	13,506,503
Short term investments	5,091,143	4,993,735
Equity investments trading	503,137	702,617
Other investments	1,379,056	1,256,948
Assumed and ceded (re)insurance contracts (2)	(6,421)	(6,211)
Derivative assets	20,449	45,233
Derivative liabilities	(26,464)	(22,360)
Other assets		16,662
Other liabilities	(12,436)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	20,270,134	20,476,465
Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	1,017,478	961,097
Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	5,107,878	4,960,409
Short term investments	0	0
Equity investments trading	503,137	702,617
Other investments	0	0
Assumed and ceded (re)insurance contracts (2)	0	0
Derivative assets	2,317	156
Derivative liabilities	(2,494)	(567)
Other liabilities	(177)	(411)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	5,610,838	5,662,615
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	8,201,356	8,546,094
Short term investments	5,091,143	4,993,735
Equity investments trading	0	0
Other investments	941,604	881,290
Assumed and ceded (re)insurance contracts (2)	0	0
Derivative assets	18,132	45,077
Derivative liabilities	(23,970)	(21,793)
Other assets		23,284
Other liabilities	(5,838)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	14,228,265	14,444,403
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
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	75,874	79,807
Assumed and ceded (re)insurance contracts (2)	(6,421)	(6,211)
Derivative assets	0	0
Derivative liabilities	0	0
Other liabilities	(6,421)	(6,211)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	69,453	73,596
Significant Unobservable Inputs (Level 3) | Other assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed and ceded (re)insurance contracts (2)	(600)	(1,400)
Significant Unobservable Inputs (Level 3) | Other liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed and ceded (re)insurance contracts (2)	(7,000)	7,600
U.S. treasuries | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	5,107,878	4,960,409
U.S. treasuries | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	5,107,878	4,960,409
U.S. treasuries | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
U.S. treasuries | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Agencies | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	227,184	368,032
Agencies | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Agencies | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	227,184	368,032
Agencies | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-U.S. government | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	518,162	491,531
Non-U.S. government | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-U.S. government | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	518,162	491,531
Non-U.S. government | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-U.S. government-backed corporate | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	335,662	338,014
Non-U.S. government-backed corporate | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-U.S. government-backed corporate | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	335,662	338,014
Non-U.S. government-backed corporate | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Corporate | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	4,289,072	4,261,025
Corporate | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Corporate | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	4,289,072	4,261,025
Corporate | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Agency mortgage-backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	957,563	1,113,792
Agency mortgage-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Agency mortgage-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	957,563	1,113,792
Agency mortgage-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-agency mortgage-backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	272,529	291,444
Non-agency mortgage-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Non-agency mortgage-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	272,529	291,444
Non-agency mortgage-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Commercial mortgage-backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	713,044	791,272
Commercial mortgage-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Commercial mortgage-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	713,044	791,272
Commercial mortgage-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Asset-backed | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	888,140	890,984
Asset-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Asset-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	888,140	890,984
Asset-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturity investments	0	0
Catastrophe bonds | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	941,604	881,290
Catastrophe bonds | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Catastrophe bonds | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	941,604	881,290
Catastrophe bonds | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Private equity funds | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	75,874	79,807
Private equity funds | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Private equity funds | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	0	0
Private equity funds | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	75,874	79,807
Fund investments | Fair Value Measured at Net Asset Value Per Share | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other investments	$ 361,578	$ 295,851

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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 1,379,056		$ 1,256,948
Other liabilities	12,858		15,193
Other assets	6,437		8,982
Debt	1,136,783		1,136,265
Long-term debt, fair value	1,231,249		1,261,069
Net investment income | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains recognized in earnings	3,200	$ (4,700)
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	1,379,056		1,256,948
Other liabilities	12,436
Other assets			16,662
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	75,874		79,807
Other liabilities	6,421		6,211
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	75,874		79,807
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	168		190
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	6,849		7,395
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	75,874		79,807
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	596		$ 1,374
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 361,578
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.70%		0.40%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.40%		0.90%
Non-U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.00%		0.50%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.20%		1.00%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.50%		2.20%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.00%
Weighted average life	4 years 10 months 24 days		3 years 9 months 18 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%
Weighted average life	5 years 3 months 18 days		5 years 2 months 12 days
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.80%		1.50%
Weighted average life	4 years 8 months 12 days		5 years
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.70%		1.80%
Weighted average life	3 years 1 month 6 days		3 years 2 months 12 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.10%		0.10%
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	$ 333,910
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 16,900
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	$ 16,886
Hedge funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 10,782

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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details) $ in Thousands	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	$ 1,379,056	$ 1,256,948
Other liabilities	(12,858)	(15,193)
Assumed and ceded (re)insurance contracts	6,437	8,982
Fair Value, Measurements, Recurring
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	1,379,056	1,256,948
Other liabilities	(12,436)
Assumed and ceded (re)insurance contracts		16,662
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	20,270,134	20,476,465
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(6,421)	(6,211)
Fair Value, Measurements, Recurring | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	75,874	79,807
Other liabilities	(6,421)	(6,211)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs	69,453	73,596
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group one
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(168)	(190)
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other liabilities	(6,849)	(7,395)
Fair Value, Measurements, Recurring | Private equity funds | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	75,874	79,807
Fair Value, Measurements, Recurring | Private equity funds | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other investments	75,874	79,807
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]
Assumed and ceded (re)insurance contracts	$ 596	$ 1,374
Discount rate | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)		0.004
Discount rate | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.009
Discount rate | Fair Value, Measurements, Recurring | Private equity funds | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares		0.090
Discount rate | Fair Value, Measurements, Recurring | Private equity funds | 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	0.090
Liquidity discount | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group one
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)		0.013
Liquidity discount | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group one
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.013
Liquidity discount | Fair Value, Measurements, Recurring | Private equity funds | Internal valuation model | Fair Value (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares		0.150
Liquidity discount | Fair Value, Measurements, Recurring | Private equity funds | 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	0.150
Bond price | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group one
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares		99.31
Bond price | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group one
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share) | $ / shares	99.51
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)		12,514,000
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	12,895,000
Expected loss ratio | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)		0.240
Expected loss ratio | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Significant observable and unobservable inputs (in dollars per share)	0.219
Expected loss ratio | 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]
Significant observable and unobservable inputs (in dollars per share)		0.000
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)	0.000

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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Level 3 Inputs) (Details) - Fair Value (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	$ 73,596	$ 79,365
Total realized and unrealized losses
Total foreign exchange losses	3	(21)
Purchases	(306)	20,351
Sales	0	(8,799)
Balance at end of the period	69,453	73,843
Net realized and unrealized losses on investments
Total realized and unrealized losses
Included in other income (loss)	(3,936)	(14,156)
Other income (loss)
Total realized and unrealized losses
Included in other income (loss)	96	(2,897)
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	79,807	74,634
Total realized and unrealized losses
Total foreign exchange losses	3	(21)
Purchases	0	20,962
Sales	0	(8,799)
Balance at end of the period	75,874	72,620
Other investments | Net realized and unrealized losses on investments
Total realized and unrealized losses
Included in other income (loss)	(3,936)	(14,156)
Other investments | Other income (loss)
Total realized and unrealized losses
Included in other income (loss)	0	0
Other assets and (liabilities)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of the period	(6,211)	4,731
Total realized and unrealized losses
Total foreign exchange losses	0	0
Purchases	(306)	(611)
Sales	0	0
Balance at end of the period	(6,421)	1,223
Other assets and (liabilities) | Net realized and unrealized losses on investments
Total realized and unrealized losses
Included in other income (loss)	0	0
Other assets and (liabilities) | Other income (loss)
Total realized and unrealized losses
Included in other income (loss)	$ 96	$ (2,897)

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Fair Value Measurements (Summary of the Balances Company Has Elected to Account For at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Other investments	$ 1,379,056	$ 1,256,948
Other assets	6,437	8,982
Other liabilities	$ 12,858	$ 15,193

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Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Senior secured bank loan funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 16,900
Fair Value Measured at Net Asset Value Per Share
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	361,578
Unfunded Commitments	1,039,549
Fair Value Measured at Net Asset Value Per Share | Private equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	333,910
Unfunded Commitments	1,031,629
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	16,886
Unfunded Commitments	7,920
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	10,782
Unfunded Commitments	$ 0

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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
	Mar. 31, 2021	Mar. 31, 2020
Premiums written
Direct	$ 225,139	$ 147,692
Assumed	2,427,303	1,878,029
Ceded	(828,359)	(755,913)
Net premiums written	1,824,083	1,269,808
Premiums earned
Direct	162,089	134,229
Assumed	1,416,646	1,149,733
Ceded	(424,899)	(370,864)
Net premiums earned	1,153,836	913,098
Claims and claim expenses
Gross claims and claim expenses incurred	1,250,246	747,715
Claims and claim expenses recovered	(383,195)	(176,761)
Net claims and claim expenses incurred	$ 867,051	$ 570,954

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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Premiums receivable	$ 3,928,122	$ 2,894,631
Premium receivable, allowance for credit loss	3,782	5,961
Reinsurance recoverable	3,200,000	2,900,000
Reinsurance recoverable, allowance for credit loss	$ 6,605	$ 6,334
Customer Concentration Risk, Customer One | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	15.00%	15.30%
Customer Concentration Risk, Customer One | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	12.70%	13.20%
Customer Concentration Risk, Customer Two | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	10.20%	10.80%
Customer Concentration Risk, Customer Two | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	7.60%	13.00%
Customer Concentration Risk, Customer Three | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	6.10%	6.70%
Customer Concentration Risk, Customer Three | Allowance for reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	5.10%	6.70%
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable
Ceded Credit Risk [Line Items]
Concentration risk, percentage	45.20%	45.20%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating
Ceded Credit Risk [Line Items]
Concentration risk, percentage	52.90%	53.40%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating
Ceded Credit Risk [Line Items]
Concentration risk, percentage	1.90%	1.40%

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Reinsurance (Schedule of Activity in the Allowance Recorded Against Premium Receivables) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Premium Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 5,961
Provision for allowance	(2,179)
Ending balance	$ 3,782

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Reinsurance (Schedule of Activity in the Allowance Recorded Against Reinsurance Recoverables) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 6,334
Provision for allowance	271
Ending balance	$ 6,605

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Reserve for Claims and Claim Expenses (Claims and Claim Expense Reserves by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	$ 3,094,045	$ 2,779,059
Additional Case Reserves	1,481,556	1,750,846
IBNR	6,377,782	5,851,233
Gross reserve for claims and claim expenses	10,953,383	10,381,138	$ 9,406,707
Property | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,292,683	1,127,909
Additional Case Reserves	1,333,734	1,617,003
IBNR	2,145,953	1,627,541
Gross reserve for claims and claim expenses	4,772,370	4,372,453
Casualty and Specialty | Operating Segments
Liability for Claims and Claims Adjustment Expense [Line Items]
Case Reserves	1,801,362	1,651,150
Additional Case Reserves	147,822	133,843
IBNR	4,231,829	4,223,692
Gross reserve for claims and claim expenses	$ 6,181,013	$ 6,008,685

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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period	$ 7,455,128	$ 6,593,052
Net incurred related to:
Current year	876,083	557,054
Prior years	(9,032)	13,900
Total net incurred	867,051	570,954
Net paid related to:
Current year	14,751	31,201
Prior years	486,488	436,286
Total net paid	501,239	467,487
Foreign exchange	(28,224)	(55,395)
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period	7,792,716	6,641,124
Reinsurance recoverable	3,160,667	2,765,583	$ 2,926,010
Reserve for claims and claim expenses as of end of period	$ 10,953,383	$ 9,406,707

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Reserve for Claims and Claim Expenses (Prior Year Development of the Reserve for Net Claims and Claim Expenses) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (9,032,000)	$ 13,900,000
Property
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(5,162,000)	13,901,000
Property | Actuarial methods - actual reported claims less than expected claims
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years		54,000,000.0
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	(5,162,000)
Property | Large catastrophe events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(14,192,000)	(32,091,000)
Property | 2019 Large Loss Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(4,742,000)	(19,681,000)
Property | 2018 Large Loss Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(3,263,000)	(14,200,000)
Property | 2017 Large Loss Events
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(5,508,000)	(6,237,000)
Property | Other
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(679,000)	8,027,000
Property | Small catastrophe events and attritional loss movements
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	9,030,000	45,992,000
Property | Other small catastrophe events and attritional loss movements
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	9,030,000	45,992,000
Property | Operating Segments
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(5,162,000)	13,901,000
Casualty and Specialty
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(3,870,000)	(1,000.0)
Casualty and Specialty | Actuarial methods - actual reported claims less than expected claims
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	(3,870,000)	(1,000)
Casualty and Specialty | Operating Segments
Liability for Catastrophe Claims [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (3,870,000)	$ (1,000)

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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Fair Value	$ 1,231,249	$ 1,261,069
Carrying Value	$ 1,136,783	1,136,265
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%
4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Stated interest rate	4.75%
Senior Notes | 3.600% Senior Notes due 2029 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	$ 431,360	453,932
Carrying Value	392,619	392,391
Senior Notes | 3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	323,262	329,661
Carrying Value	296,909	296,787
Senior Notes | 3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc.
Debt Instrument [Line Items]
Fair Value	310,881	315,273
Carrying Value	298,519	298,428
Senior Notes | 4.750% Senior Notes due 2025 (DaVinciRe) | DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Fair Value	165,746	162,203
Carrying Value	$ 148,736	$ 148,659

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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 1,105,648
RenaissanceRe Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	0
Letter of Credit | Funds at Lloyd’s Letter of Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	225,000
Letter of Credit | Secured Bilateral Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	392,116
Letter of Credit | Unsecured Bilateral Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 488,532

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Noncontrolling Interests (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 3,409,570		$ 3,388,319
Net (loss) income attributable to redeemable noncontrolling interests		(46,850)	$ 98,091
DaVinci Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests		40,000
Aggregate sale of shares	$ 10,000
Third-Party Investors
Redeemable Noncontrolling Interest [Line Items]
Redemption of shares from redeemable noncontrolling interest		$ 156,700
DaVinci Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest	21.40%	28.70%		21.40%
Medici
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest		15.40%	11.20%
DaVinciRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 1,555,714	$ 1,533,085	$ 1,560,693	$ 1,435,581
Net (loss) income attributable to redeemable noncontrolling interests		(39,934)	84,906
Sale of shares to redeemable noncontrolling interests		250,000
Redemption of shares from redeemable noncontrolling interest		155,971	(2,607)
DaVinciRe Holdings Ltd. | Third-Party Investors
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests		150,900
DaVinciRe Holdings Ltd. | RenaissanceRe Holdings Ltd.
Redeemable Noncontrolling Interest [Line Items]
Sale of shares to redeemable noncontrolling interests		$ 99,100
DaVinciRe Holdings Ltd. | Maximum
Redeemable Noncontrolling Interest [Line Items]
Share repurchase requests, limit		25.00%
Medici
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 737,702	677,283	717,999	632,112
Net (loss) income attributable to redeemable noncontrolling interests		(13,443)	(4,678)
Sale of shares to redeemable noncontrolling interests		40,845	54,613
Redemption of shares from redeemable noncontrolling interest		$ 7,699	4,764
Redemption provision, notice period		30 days
Medici | Vermeer Reinsurance Ltd. | Voting, Non-participating Shares
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest		100.00%
Vermeer Reinsurance Ltd.
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests		$ 1,116,154	1,021,478	$ 1,109,627	$ 1,003,615
Net (loss) income attributable to redeemable noncontrolling interests		$ 6,527	$ 17,863
PFZW | Vermeer Reinsurance Ltd. | Participating, Non-voting Common Shares
Redeemable Noncontrolling Interest [Line Items]
Parent company ownership in redeemable noncontrolling interest		100.00%

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Noncontrolling Interests (Schedule of Redeemable Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Activity in redeemable noncontrolling interest
Beginning balance	$ 3,388,319
Net loss attributable to redeemable noncontrolling interest	(46,850)	$ 98,091
Ending balance	3,409,570
DaVinciRe Holdings Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,560,693	1,435,581
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(155,971)	2,607
Sale of shares to redeemable noncontrolling interests	250,000
Net loss attributable to redeemable noncontrolling interest	(39,934)	84,906
Ending balance	1,555,714	1,533,085
DaVinciRe Holdings Ltd. | Third-Party Investors And RenaissanceRe
Activity in redeemable noncontrolling interest
Sale of shares to redeemable noncontrolling interests	190,926	9,991
Medici
Activity in redeemable noncontrolling interest
Beginning balance	717,999	632,112
Redemption of shares from redeemable noncontrolling interest, net of adjustments	(7,699)	(4,764)
Sale of shares to redeemable noncontrolling interests	40,845	54,613
Net loss attributable to redeemable noncontrolling interest	(13,443)	(4,678)
Ending balance	737,702	677,283
Vermeer Reinsurance Ltd.
Activity in redeemable noncontrolling interest
Beginning balance	1,109,627	1,003,615
Net loss attributable to redeemable noncontrolling interest	6,527	17,863
Ending balance	$ 1,116,154	$ 1,021,478

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Variable Interest Entities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets	$ 32,236,097,000		$ 30,820,580,000
Liabilities	21,748,190,000		19,872,013,000
Redeemable noncontrolling interests	3,409,570,000		3,388,319,000
Ceded premiums written	828,359,000	$ 755,913,000
Ceded premiums earned	424,899,000	370,864,000
Reinsurance recoverable	3,160,667,000	2,765,583,000	2,926,010,000
Investments in other ventures, under equity method	91,362,000		98,373,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	3,900,000,000		3,800,000,000
Liabilities	3,900,000,000		3,800,000,000
Net assets	2,000,000,000.0
Upsilon RFO Re Ltd. | Third party investor | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Payments of capital distribution	145,000,000.0	81,800,000
Net assets	300,000,000
Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Contributions to subsidiaries	470,300,000	620,900,000
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Payments of capital distribution	$ 9,200,000	$ 29,900,000
Variable interest entity, ownership percentage	12.80%	14.20%
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Contributions to subsidiaries	$ 32,300,000	$ 75,400,000
Vermeer Reinsurance Ltd.
Variable Interest Entity [Line Items]
Redeemable noncontrolling interests	1,116,154,000	1,021,478,000	1,109,627,000	$ 1,003,615,000
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	1,200,000,000		1,100,000,000
Liabilities	47,500,000		36,700,000
Redeemable noncontrolling interests	1,100,000,000		1,100,000,000
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	423,800,000		400,300,000
Liabilities	423,800,000		400,300,000
Mona Lisa Re | Other investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investment in participating notes	3,700,000		3,700,000
Mona Lisa Re | Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Ceded premiums written	28,300,000	24,300,000
Ceded premiums earned	9,500,000	24,300,000
Mona Lisa Re | DaVinci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Ceded premiums written	6,400,000	6,700,000
Ceded premiums earned	1,700,000	6,700,000
Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Ceded premiums written	0	0
Ceded premiums earned	0	0
Ceded net claims and claim expenses	0	$ (1,100,000)
Reinsurance recoverable	0		0
Fibonacci Reinsurance Ltd. | Other investments | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investment in participating notes	0		0
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	2,100,000		2,000,000.0
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	$ 100,000		$ 100,000

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Shareholders' Equity (Details) - USD ($)				3 Months Ended
	Mar. 31, 2021	Mar. 15, 2021	Jun. 05, 2020	Mar. 31, 2021	Mar. 31, 2020	Feb. 05, 2021	Dec. 31, 2020	Mar. 26, 2020
Class of Stock [Line Items]
Preference shares, shares outstanding (in shares)	11,010,000			11,010,000			11,010,000
Dividends per common share (in dollars per share)				$ 0.36	$ 0.35
Dividends paid per common share (in dollars per share)	$ 0.36
Dividends declared and paid, preference shares				$ 7,289,000	$ 9,056,000
Dividends declared and paid, common shares				$ 17,800,000	$ 15,400,000
Common Shares
Class of Stock [Line Items]
Proceeds from issuance			$ 1,100,000,000
Dividends per common share (in dollars per share)		$ 0.36
Share repurchase program, authorized amount						$ 500,000,000.0
Share repurchase program, shares repurchased (in shares)				1,076,344
Repurchase of shares				$ (171,600,000)
Share repurchase program, price per share (in dollars per share)				$ 159.47
Share repurchase program, remaining authorized aggregate amount	$ 328,400,000			$ 328,400,000
Common Shares | Underwritten Follow-On Offering
Class of Stock [Line Items]
Shares issued (in shares)			6,325,000
Price of shares issued (in dollars per share)			$ 166.00
Common Shares | Private Placement
Class of Stock [Line Items]
Shares issued (in shares)			451,807
Proceeds from issuance			$ 75,000,000.0
Series C Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage				6.08%
Preference shares redemption value								$ 125,000,000.0
Preference shares, shares outstanding (in shares)	0			0
Liquidation preference per annum (in dollars per share)	$ 1.52			$ 1.52
Liquidation preference quarterly (in dollars per share)	0.38			$ 0.38
Series E Preference Shares
Class of Stock [Line Items]
Dividend rate, percentage				5.375%
Liquidation preference per annum (in dollars per share)	1.34375			$ 1.34375
Liquidation preference quarterly (in dollars per share)	0.3359375			$ 0.3359375
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
Liquidation preference quarterly (in dollars per share)	359.375			359.375
Depositary Shares
Class of Stock [Line Items]
Liquidation preference per annum (in dollars per share)	1.4375			1.4375
Liquidation preference quarterly (in dollars per share)	$ 0.359375			$ 0.359375

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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
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss attributable to RenaissanceRe common shareholders	$ (290,934)	$ (81,974)
Amount allocated to participating common shareholders	(129)	(146)
Net loss allocated to RenaissanceRe common shareholders	$ (291,063)	$ (82,120)
Denominator:
Denominator for basic loss per RenaissanceRe common share - weighted average common shares	49,579	43,441
Per common share equivalents of employee stock options and non-vested shares	0	0
Denominator for diluted loss per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions	49,579	43,441
Net loss attributable to RenaissanceRe common shareholders per common share – basic (in dollars per share)	$ (5.87)	$ (1.89)
Net loss attributable to RenaissanceRe common shareholders per common share – diluted (in dollars per share)	$ (5.87)	$ (1.89)

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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Gross premiums written	$ 2,652,442,000	$ 2,025,721,000
Net premiums written	1,824,083,000	1,269,808,000
Net premiums earned	1,153,836,000	913,098,000
Net claims and claim expenses incurred	867,051,000	570,954,000
Acquisition expenses	267,234,000	210,604,000
Operational expenses	55,311,000	67,461,000
Underwriting (loss) income	(35,760,000)	64,079,000
Net investment income	79,804,000	99,473,000
Net foreign exchange losses	(22,788,000)	(5,728,000)
Equity in (losses) earnings of other ventures	(5,558,000)	4,564,000
Other income (loss)	2,171,000	(4,436,000)
Net realized and unrealized losses on investments	(345,563,000)	(110,707,000)
Corporate expenses	(10,405,000)	(15,991,000)
Interest expense	(11,912,000)	(14,927,000)
(Loss) income before taxes	(350,011,000)	16,327,000
Income tax benefit	19,516,000	8,846,000
Net loss (income) attributable to redeemable noncontrolling interests	46,850,000	(98,091,000)
Dividends on preference shares	(7,289,000)	(9,056,000)
Net (loss) income attributable to RenaissanceRe common shareholders	(290,934,000)	(81,974,000)
Net claims and claim expenses incurred – current accident year	876,083,000	557,054,000
Net claims and claim expenses incurred – prior accident years	(9,032,000)	13,900,000
Total net incurred	$ 867,051,000	$ 570,954,000
Net claims and claim expense ratio – current accident year	75.90%	61.00%
Net claims and claim expense ratio – prior accident years	(0.80%)	1.50%
Net claims and claim expense ratio – calendar year	75.10%	62.50%
Underwriting expense ratio	28.00%	30.50%
Combined ratio	103.10%	93.00%
Other
Segment Reporting Information [Line Items]
Gross premiums written	$ 0	$ 0
Net premiums written	0	0
Net premiums earned	0	0
Net claims and claim expenses incurred	0	0
Acquisition expenses	0	0
Operational expenses	0	0
Underwriting (loss) income	0	0
Net investment income	79,804,000	99,473,000
Net foreign exchange losses	(22,788,000)	(5,728,000)
Equity in (losses) earnings of other ventures	(5,558,000)	4,564,000
Other income (loss)	2,171,000	(4,436,000)
Net realized and unrealized losses on investments	(345,563,000)	(110,707,000)
Corporate expenses	(10,405,000)	(15,991,000)
Interest expense	(11,912,000)	(14,927,000)
Income tax benefit	19,516,000	8,846,000
Net loss (income) attributable to redeemable noncontrolling interests	46,850,000	(98,091,000)
Dividends on preference shares	(7,289,000)	(9,056,000)
Net claims and claim expenses incurred – current accident year	0	0
Net claims and claim expenses incurred – prior accident years	0	0
Total net incurred	0	0
Property
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years	(5,162,000)	13,901,000
Property | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	1,616,819,000	1,220,526,000
Net premiums written	1,008,460,000	674,581,000
Net premiums earned	605,166,000	421,335,000
Net claims and claim expenses incurred	498,832,000	144,745,000
Acquisition expenses	112,754,000	85,351,000
Operational expenses	35,375,000	44,007,000
Underwriting (loss) income	(41,795,000)	147,232,000
Net claims and claim expenses incurred – current accident year	503,994,000	130,844,000
Net claims and claim expenses incurred – prior accident years	(5,162,000)	13,901,000
Total net incurred	$ 498,832,000	$ 144,745,000
Net claims and claim expense ratio – current accident year	83.30%	31.10%
Net claims and claim expense ratio – prior accident years	(0.90%)	3.30%
Net claims and claim expense ratio – calendar year	82.40%	34.40%
Underwriting expense ratio	24.50%	30.70%
Combined ratio	106.90%	65.10%
Casualty and Specialty
Segment Reporting Information [Line Items]
Net claims and claim expenses incurred – prior accident years	$ (3,870,000)	$ (1,000.0)
Casualty and Specialty | Operating Segments
Segment Reporting Information [Line Items]
Gross premiums written	1,035,623,000	805,195,000
Net premiums written	815,623,000	595,227,000
Net premiums earned	548,670,000	491,763,000
Net claims and claim expenses incurred	368,219,000	426,209,000
Acquisition expenses	154,480,000	125,253,000
Operational expenses	19,936,000	23,454,000
Underwriting (loss) income	6,035,000	(83,153,000)
Net claims and claim expenses incurred – current accident year	372,089,000	426,210,000
Net claims and claim expenses incurred – prior accident years	(3,870,000)	(1,000)
Total net incurred	$ 368,219,000	$ 426,209,000
Net claims and claim expense ratio – current accident year	67.80%	86.70%
Net claims and claim expense ratio – prior accident years	(0.70%)	0.00%
Net claims and claim expense ratio – calendar year	67.10%	86.70%
Underwriting expense ratio	31.80%	30.20%
Combined ratio	98.90%	116.90%

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Derivative Instruments (Consolidated Balance Sheets and Fair Value of the Principal Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative Assets
Gross Amounts of Recognized Assets	$ 20,592	$ 46,349
Gross Amounts Offset in the Balance Sheet	143	1,116
Net Amounts of Assets Presented in the Balance Sheet	20,449	45,233
Collateral	0	0
Net Amount	20,449	45,233
Derivative Liabilities
Gross Amounts of Recognized Liabilities	26,607	23,292
Gross Amounts Offset in the Balance Sheet	143	932
Net Amounts of Liabilities Presented in the Balance Sheet	26,464	22,360
Collateral Pledged	2,494	1,620
Net Amount	23,970	20,740
Not Designated as Hedging Instrument | Other assets
Derivative Assets
Gross Amounts of Recognized Assets	18,574	26,396
Gross Amounts Offset in the Balance Sheet	143	1,116
Net Amounts of Assets Presented in the Balance Sheet	18,431	25,280
Collateral	0	0
Net Amount	18,431	25,280
Not Designated as Hedging Instrument | Other assets | Interest rate futures
Derivative Assets
Gross Amounts of Recognized Assets	2,317	1,019
Gross Amounts Offset in the Balance Sheet	0	863
Net Amounts of Assets Presented in the Balance Sheet	2,317	156
Collateral	0	0
Net Amount	2,317	156
Not Designated as Hedging Instrument | Other assets | Interest rate swaps
Derivative Assets
Gross Amounts of Recognized Assets	232	22
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	232	22
Collateral	0	0
Net Amount	232	22
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, underwriting and non-investment operations
Derivative Assets
Gross Amounts of Recognized Assets	13,064	23,055
Gross Amounts Offset in the Balance Sheet	0	184
Net Amounts of Assets Presented in the Balance Sheet	13,064	22,871
Collateral	0	0
Net Amount	13,064	22,871
Not Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations
Derivative Assets
Gross Amounts of Recognized Assets	2,750	2,232
Gross Amounts Offset in the Balance Sheet	143	69
Net Amounts of Assets Presented in the Balance Sheet	2,607	2,163
Collateral	0	0
Net Amount	2,607	2,163
Not Designated as Hedging Instrument | Other assets | Credit default swaps
Derivative Assets
Gross Amounts of Recognized Assets	211	68
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	211	68
Collateral	0	0
Net Amount	211	68
Not Designated as Hedging Instrument | Other liabilities
Derivative Liabilities
Gross Amounts of Recognized Liabilities	24,242	18,140
Gross Amounts Offset in the Balance Sheet	143	932
Net Amounts of Liabilities Presented in the Balance Sheet	24,099	17,208
Collateral Pledged	2,494	1,620
Net Amount	21,605	15,588
Not Designated as Hedging Instrument | Other liabilities | Interest rate futures
Derivative Liabilities
Gross Amounts of Recognized Liabilities	2,494	1,430
Gross Amounts Offset in the Balance Sheet	0	863
Net Amounts of Liabilities Presented in the Balance Sheet	2,494	567
Collateral Pledged	2,494	567
Net Amount	0	0
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, underwriting and non-investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	17,573	12,791
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	17,573	12,791
Collateral Pledged	0	0
Net Amount	17,573	12,791
Not Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	4,175	3,919
Gross Amounts Offset in the Balance Sheet	143	69
Net Amounts of Liabilities Presented in the Balance Sheet	4,032	3,850
Collateral Pledged	0	1,053
Net Amount	4,032	2,797
Designated as Hedging Instrument | Other assets | Foreign currency forward contracts, investment operations
Derivative Assets
Gross Amounts of Recognized Assets	2,018	19,953
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Assets Presented in the Balance Sheet	2,018	19,953
Collateral	0	0
Net Amount	2,018	19,953
Designated as Hedging Instrument | Other liabilities | Foreign currency forward contracts, investment operations
Derivative Liabilities
Gross Amounts of Recognized Liabilities	2,365	5,152
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	2,365	5,152
Collateral Pledged	0	0
Net Amount	$ 2,365	$ 5,152

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Derivative Instruments (Gain (Loss) Recognized in the Consolidated Statements of Operations Related to its Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ 4,070	$ 50,095
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	6,159	39,251
Not Designated as Hedging Instrument | Net realized and unrealized losses on investments | Interest rate futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	15,507	88,006
Not Designated as Hedging Instrument | Net realized and unrealized losses on investments | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(901)	2,107
Not Designated as Hedging Instrument | Net realized and unrealized losses on investments | Credit default swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	255	(4,897)
Not Designated as Hedging Instrument | Net realized and unrealized losses on investments | Total return swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	0	(21,137)
Not Designated as Hedging Instrument | Net realized and unrealized losses on investments | Equity futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	0	(30,898)
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	(3,641)	(330)
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	(5,061)	6,400
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(2,089)	10,844
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive loss	$ (2,089)	$ 10,844

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Derivative Instruments (Narrative) (Details) - Not Designated as Hedging Instrument - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Interest rate futures | Long
Derivative [Line Items]
Notional amount	$ 1,800,000,000	$ 2,000,000,000.0
Interest rate futures | Short
Derivative [Line Items]
Notional amount	900,000,000	1,000,000,000.0
Interest rate swaps | US Dollars | Paying a Fixed Rate
Derivative [Line Items]
Notional amount	0	0
Interest rate swaps | US Dollars | Receiving a Fixed Rate
Derivative [Line Items]
Notional amount	20,200,000	23,500,000
Foreign currency forward contracts, underwriting and non-investment operations | Long
Derivative [Line Items]
Notional amount	843,300,000	661,400,000
Foreign currency forward contracts, underwriting and non-investment operations | Short
Derivative [Line Items]
Notional amount	355,600,000	504,200,000
Foreign currency forward contracts, investment operations | Long
Derivative [Line Items]
Notional amount	265,500,000	269,500,000
Foreign currency forward contracts, investment operations | Short
Derivative [Line Items]
Notional amount	139,300,000	117,500,000
Credit default swaps | Long
Derivative [Line Items]
Notional amount	25,000,000.0	0
Credit default swaps | Short
Derivative [Line Items]
Notional amount	77,900,000	96,800,000
Total return swaps
Derivative [Line Items]
Notional amount	0	0
Equity futures
Derivative [Line Items]
Notional amount	$ 0	$ 0

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Derivative Instruments (Derivative Instruments Designated as Hedges of a Net Investment in a Foreign Operation) (Details) - Foreign Exchange Forward - Designated as Hedging Instrument - Net Investment Hedging - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted average of U.S. dollar equivalent of foreign denominated net (liabilities) assets	$ (97,219)	$ 76,804
Derivative (losses) gains	$ (2,089)	$ 10,844

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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 01, 2021	Apr. 23, 2021	Mar. 31, 2021	Mar. 31, 2020
Common Shares
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)			1,076,344
Repurchase of shares			$ 171,600
Share repurchase program, price per share (in dollars per share)			$ 159.47
Medici
Subsequent Event [Line Items]
Capital raised			$ 40,845	$ 54,613
Subsequent Event | Common Shares
Subsequent Event [Line Items]
Share repurchase program, shares repurchased (in shares)		330,000
Repurchase of shares		$ 55,300
Share repurchase program, price per share (in dollars per share)		$ 167.62
Subsequent Event | Medici
Subsequent Event [Line Items]
Capital raised	$ 100,000
Medici
Subsequent Event [Line Items]
Parent company ownership in redeemable noncontrolling interest			15.40%	11.20%
Medici | Subsequent Event
Subsequent Event [Line Items]
Parent company ownership in redeemable noncontrolling interest	13.70%