10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended June 30, 2024

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: 1-09761

ARTHUR J. GALLAGHER & CO.

(Exact name of registrant as specified in its charter)

Delaware	36-2151613
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification No.)

2850 Golf Road, Rolling Meadows, Illinois 60008

(Address of principal executive offices) (Zip Code)

(630) 773-3800

(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 Stock, par value $1.00 per share	AJG	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 outstanding shares of the registrant’s common stock, $1.00 par value, as of June 30, 2024 was approximately 219.1 million.

Information Concerning Forward-Looking Statements

This report contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future of Arthur J Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us, Gallagher or the company, which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward‑looking statements relate to expectations or forecasts of future events. Such statements use words such as “anticipate,” “believe,” “estimate,” “expect,” “contemplate,” “forecast,” “project,” “intend,” “plan,” “potential,” and other similar terms, and future or conditional tense verbs like “could,” “may,” “might,” “see,” “should,” “will” and “would.” You can also identify forward-looking statements by the fact that they do not relate strictly to historical or current facts. For example, we may use forward-looking statements when addressing topics such as: the impact of general economic conditions, including significant inflation, interest rates and market uncertainty; the effects of geopolitical volatility, including repercussions from the wars in Ukraine and the Middle East; market and industry conditions, including competitive and pricing trends; acquisition strategy including the expected size of our acquisition program; the expected impact of acquisitions and dispositions and integrating recent acquisitions, including comments regarding the expected benefits of our acquisition of the Willis Towers Watson plc treaty reinsurance brokerage operations (which we refer to as Willis Re), BCHR Holdings, L.P., and its subsidiaries, dba Buck (which we refer to as Buck), Cadence Insurance, Inc. (which we refer to as Cadence Insurance), Eastern Insurance Group, LLC (which we refer to as Eastern Insurance), My Plan Manager Group Pty Ltd (which we refer to as My Plan Manager) and other acquisitions larger than our typical tuck-in acquisitions and the expected duration and costs of integrating such large acquisitions; the development and performance of our services and products; changes in the composition or level of our revenues or earnings; our cost structure and the size and outcome of cost-saving or restructuring initiatives; future capital expenditures; future debt levels and anticipated actions to be taken in connection with maturing debt; future debt to earnings ratios; the outcome of contingencies; dividend policy; pension obligations; cash flow and liquidity; capital structure and financial losses; future actions by regulators; the outcome of existing regulatory actions, audits, reviews or litigation; the impact of changes in accounting rules; financial markets; interest rates; foreign exchange rates; matters relating to our operations; income taxes; expectations regarding our investments, human capital management, including diversity and inclusion initiatives; and environmental, social and governance matters, including climate-resilience and climate-advising products and services and carbon emissions. These forward‑looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors.

Potential factors that could impact results include:

•Global economic and geopolitical events, such as fluctuations in interest and inflation rates; a recession or economic downturn; failures of financial institutions and other counterparties; a potential United States (U.S.) government shutdown or gridlock over increasing the U.S. debt ceiling; political violence and instability, including as a result of geo-economic fragmentation or the U.S. election;

•Economic conditions that result in financial difficulties for underwriting enterprises or lead to reduced risk-taking capital capacity, for example, as a result of large payouts related to extreme weather events, or to the failure of such enterprises, including the increased risk of errors and omissions (which we refer to as E&O) claims against us;

•Risks that could negatively affect the success of our acquisition strategy, including the impact of economic uncertainty on our ability to source, review and price acquisitions; continuing consolidation in our industry and interest in acquiring insurance brokers on the part of private equity firms and newly public insurance brokers, which makes it more difficult to identify targets and in some cases makes them more expensive; inaccurate assumptions and failure to realize expected benefits; the risk that we may not receive timely regulatory approval of pending transactions; closing risks; execution risks; integration risks; poor cultural fit; the risk of post-acquisition deterioration leading to intangible asset impairment charges; and the risk we could incur or assume unanticipated liabilities such as cybersecurity issues or those relating to violations of anti-corruption and sanctions laws;

•Risks related to Willis Re, Buck, Cadence Insurance, Eastern Insurance, My Plan Manager and other acquisitions larger than our usual tuck-in acquisitions, including risks related to our ability to successfully integrate operations (including with respect to technology and financial systems required to be converted as transition services agreements phase out from time to time), the possibility that our assumptions may be inaccurate resulting in unforeseen obligations or liabilities and failure to realize the expected benefits of these acquisitions;

•Damage to our reputation, including as a result of environmental, social and governance (which we refer to as ESG) matters, and the potential for the Internet and social media to magnify the effects of such reputational issues;

•Failure to meet our sustainability and ESG-related aspirations, goals and initiatives or to comply with increasingly complex climate-related regulations including increased risks related to “greenwashing”;

•Failure to apply technology, data analytics and artificial intelligence (which we refer to as AI) effectively in driving value for our clients through technology-based solutions, or failure to gain internal efficiencies and effective internal controls through the application of technology and related tools;

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•Risks associated with the use of AI in our business operations, including regulatory, data privacy, cybersecurity, E&O and competition risks;

•Failure to attract and retain experienced and qualified talent, including our senior management team, or adequately plan and execute for the succession of such leaders; increased costs resulting from increased compensation and benefits packages as a result of a tighter labor market, and negative effects from restrictions on non-compete agreements at the state and federal level;

•Substantial increase in remote work among our employees, which may affect our corporate culture, productivity, collaboration and effective communication, increase cybersecurity or data breaches risks, heighten vulnerability to solicitations by competing firms and impact our ability to recruit and retain employees that prefer fully remote or fully in person work environments;

•A disaster or other significant disruption to business continuity for our own operations or those of third-parties on which we rely, including cybersecurity incidents; natural disasters; political violence and unrest in the U.S. or elsewhere around the world; for example, our substantial operations in India could be negatively impacted as a result of the dispute between India and Pakistan involving the Kashmir region, rising tensions between India and China, incidents of terrorism in India, civil unrest or other reasons;

•Sustained increases in the cost of employee benefits and compensation expense;

•Risks arising from our international operations and changes in international conditions, including the risks posed by political and economic uncertainty in certain countries (including repercussions from the wars in Ukraine and the Middle East and the results of the U.S. election), maintaining regulatory and legal compliance across multiple jurisdictions (such as those relating to violations of anti‑corruption, sanctions, and privacy laws, increasingly complex regulatory requirements related to climate change and sustainability issues and increased protectionism), tariffs, trade wars, climate change and other long-term environmental, social and governance matters and global health risks;

•Risks related to changes in U.S. or foreign tax laws, including a U.S. or foreign tax rate change, potential changes in guidance related to the U.S. Inflation Reduction Act, the Organisation for Economic Co-operation and Development’s (OECD) global minimum corporate tax regime, and other local policy changes;

•Competitive pressures, including as a result of innovation, in each of our businesses;

•Volatility or declines in premiums or other adverse trends in the insurance industry;

•The higher level of variability inherent in contingent and supplemental revenues versus standard commission revenues;

•Risks particular to our benefit consulting operations, including risks related to the acquisition of Buck;

•Risks particular to our third-party claims administrations operations, including risks related to the availability of RISX‑FACS®, our proprietary risk management information system, wage inflation, staffing shortages, any slowing of the trend toward outsourcing claims administration, and the concentration of large amounts of revenue with certain clients;

•Climate risks, including the risk of a systemic economic crisis and disruptions to our business caused by the transition to a low-carbon economy;

•Cyber-attacks or other cybersecurity incidents and the heightened risk of such attacks as a result of the wars in Ukraine and the Middle East; improper disclosure of confidential, personal or proprietary data and changes to laws and regulations governing cybersecurity and data privacy;

•Unfavorable determinations related to contingencies and legal proceedings;

•Violations or alleged violations of the U.S. Foreign Corrupt Practices Act (which we refer to as FCPA), the United Kingdom (U.K.) Bribery Act 2010 or other anti-corruption laws and the Foreign Account Tax Compliance provisions of the Hiring Incentives to Restore Employment Act, and the outcome of any existing or future investigation, review, regulatory action or litigation;

•Failure to comply with regulatory requirements, including those related to governance and control requirements in particular jurisdictions, international sanctions, including new sanctions laws as a result of the wars in Ukraine and the Middle East; laws relating to the disclosure of ESG-related matters; laws relating to the use of AI, or a change in regulations or enforcement policies that adversely affects our operations (for example, relating to insurance broker compensation methods or restrictions on non-compete agreements);

•Changes to our financial presentation from new accounting estimates and assumptions;

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•Intellectual property risks;

•Risks related to our legacy clean energy investments, including intellectual property claims, environmental and product liability claims, environmental compliance costs and the risk of disallowance by the Internal Revenue Service of previously claimed tax credits;

•The risk that our outstanding debt adversely affects our financial flexibility and restrictions and limitations in the agreements and instruments governing our debt;

•The risk of credit rating downgrades;

•The risk that we may not be able to receive dividends or other distributions from our subsidiaries, including the effects of significant changes in foreign exchange rates;

•The risk of share ownership dilution when we issue common stock; and

•Volatility of the price of our common stock.

Forward-looking statements are not guarantees of future performance. They involve risks, uncertainties and assumptions, including the risk factors referred to above. Our future performance and actual results or outcomes may differ materially from those expressed in forward-looking statements. Accordingly, you should not place undue reliance on forward-looking statements, which speak only as of, and are based on information available to us on the date of the applicable document. Many of the factors that will determine these results are beyond our ability to control or predict. All subsequent written and oral forward-looking statements attributable to us or any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section. Forward-looking statements speak only as of the date that they are made, and we do not undertake any obligation to update any such statements or release publicly any revisions to these forward-looking statements to reflect events or circumstances after the date of this report or to reflect new information, future or unexpected events or otherwise, except as required by applicable law or regulation. In addition, historical, current and forward-looking sustainability-related or ESG-related statements may be based on standards for measuring progress that are still developing, internal controls and processes that continue to evolve, and assumptions that are subject to change in the future.

A detailed discussion of the factors that could cause actual results to differ materially from our published expectations is contained under the heading “Risk Factors” in our filings with the Securities and Exchange Commission (SEC), including our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, this Quarterly Report on Form 10-Q and any other reports we file with the SEC in the future.

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Arthur J. Gallagher & Co.

Index

			Page No.
Part I.	Financial Information
	Item 1.	Financial Statements (Unaudited):
		Consolidated Statement of Earnings for the Three-Month and Six-Month Periods Ended June 30, 2024 and 2023	6
		Consolidated Statement of Comprehensive Earnings for the Three-Month and Six-Month Periods Ended June 30, 2024 and 2023	7
		Consolidated Balance Sheet at June 30, 2024 and December 31, 2023	8
		Consolidated Statement of Cash Flows for the Six-Month Periods Ended June 30, 2024 and 2023	9
		Consolidated Statement of Stockholders’ Equity for the Three-Month and Six-Month Periods Ended June 30, 2024 and 2023	10-11
		Notes to June 30, 2024 Consolidated Financial Statements	12-34
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35-62
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	62-63
	Item 4.	Controls and Procedures	63
Part II.	Other Information
	Item 1.	Legal Proceedings	64
	Item 1A.	Risk Factors.	64
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	64-65
	Item 6.	Exhibits	65
	Signature		66

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Part I - Financial Information

Item 1. Financial Statements (Unaudited)

Arthur J. Gallagher & Co.

Consolidated Statement of Earnings

(Unaudited - in millions, except per share data)

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Commissions	$	1,661.8	$	1,410.4	$	3,655.4	$	3,157.8
Fees		827.1		790.5		1,778.3		1,496.2
Supplemental revenues		88.7		71.2		182.6		152.8
Contingent revenues		59.8		54.2		145.8		126.0
Interest income, premium finance revenues and other income		98.6		80.6		192.0		147.0
Revenues before reimbursements		2,736.0		2,406.9		5,954.1		5,079.8
Reimbursements		39.4		35.0		78.0		68.2
Total revenues		2,775.4		2,441.9		6,032.1		5,148.0
Compensation		1,620.1		1,413.0		3,346.0		2,828.5
Operating		425.6		433.6		861.3		816.1
Reimbursements		39.4		35.0		78.0		68.2
Interest		94.3		77.8		186.5		145.7
Depreciation		40.8		40.8		86.2		78.5
Amortization		170.8		134.9		333.1		256.6
Change in estimated acquisition earnout payables		18.8		9.4		2.7		51.2
Total expenses		2,409.8		2,144.5		4,893.8		4,244.8
Earnings before income taxes		365.6		297.4		1,138.3		903.2
Provision for income taxes		80.2		61.6		240.2		180.8
Net earnings		285.4		235.8		898.1		722.4
Net earnings attributable to noncontrolling interests		2.0		1.3		6.3		1.4
Net earnings attributable to controlling interests	$	283.4	$	234.5	$	891.8	$	721.0
Basic net earnings per share	$	1.30	$	1.09	$	4.09	$	3.37
Diluted net earnings per share		1.27		1.07		4.01		3.31
Dividends declared per common share		0.60		0.55		1.20		1.10

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.

Consolidated Statement of Comprehensive Earnings

(Unaudited - in millions)

	Three-month period ended					Six-month period ended
	June 30,					June 30,
	2024			2023		2024			2023
Net earnings	$	285.4		$	235.8	$	898.1		$	722.4
Change in pension liability, net of taxes		(0.1	)		0.7		0.2			1.5
Foreign currency translation, net of taxes		11.3			193.5		(144.5	)		226.8
Change in fair value of derivative investments,    net of taxes		(1.4	)		24.3		(2.8	)		29.2
Comprehensive earnings		295.2			454.3		751.0			979.9
Comprehensive earnings attributable to    noncontrolling interests		2.1			1.6		6.4			1.6
Comprehensive earnings attributable to    controlling interests	$	293.1		$	452.7	$	744.6		$	978.3

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.

Consolidated Balance Sheet

(Unaudited - in millions)

	June 30, 2024			December 31, 2023
Cash and cash equivalents	$	1,415.3		$	971.5
Fiduciary assets (includes fiduciary cash of $5,422.5 and $5,571.8 in 2023)		37,316.9			26,907.9
Accounts receivable, net		4,178.3			3,786.6
Other current assets		403.0			450.1
Total current assets		43,313.5			32,116.1
Fixed assets - net		655.3			726.4
Deferred income taxes (includes tax credit carryforwards of $805.1 in 2024    and $867.4 in 2023)		1,040.1			1,132.3
Other noncurrent assets		1,311.6			1,131.8
Right-of-use assets		382.3			400.3
Goodwill		11,915.5			11,475.6
Amortizable intangible assets - net		4,389.4			4,633.3
Total assets	$	63,007.7		$	51,615.8
Fiduciary liabilities	$	37,316.9		$	26,907.9
Accrued compensation and other current liabilities		3,107.8			2,553.1
Deferred revenue - current		697.1			644.7
Premium financing debt		207.8			289.0
Corporate related borrowings - current		280.0			670.0
Total current liabilities		41,609.6			31,064.7
Corporate related borrowings - noncurrent		7,790.9			7,006.0
Deferred revenue - noncurrent		65.8			61.5
Lease liabilities - noncurrent		335.2			352.2
Other noncurrent liabilities		1,606.9			2,316.1
Total liabilities		51,408.4			40,800.5
Stockholders' equity:
Common stock - issued and outstanding 219.1 shares in 2024 and 216.7 shares in 2023		219.1			216.7
Capital in excess of par value		7,611.4			7,297.8
Retained earnings		4,681.2			4,052.9
Accumulated other comprehensive loss		(939.2	)		(792.1	)
Stockholders' equity attributable to controlling interests		11,572.5			10,775.3
Stockholders' equity attributable to noncontrolling interests		26.8			40.0
Total stockholders' equity		11,599.3			10,815.3
Total liabilities and stockholders' equity	$	63,007.7		$	51,615.8

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.

Consolidated Statement of Cash Flows

(Unaudited - in millions)

	Six-month period ended
	June 30,
	2024			2023
Cash flows from operating activities:
Net earnings	$	898.1		$	722.4
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other		(1.8	)		(4.1	)
Depreciation and amortization		419.3			335.1
Change in estimated acquisition earnout payables		2.7			51.2
Amortization of deferred compensation and restricted stock		58.1			48.5
Stock-based and other noncash compensation expense		21.1			11.9
Payments on acquisition earnouts in excess of original estimates		(23.3	)		(57.5	)
Provision for deferred income taxes		5.6			(0.9	)
Effect of changes in foreign exchange rates		0.6			11.0
Net change in accounts receivable, net		(469.2	)		(732.3	)
Net change in deferred revenue		55.3			78.8
Net change in other current assets		2.7			(29.9	)
Net change in accrued compensation and other accrued liabilities		(94.5	)		15.0
Net change in income taxes payable		0.6			14.9
Net change in other noncurrent assets and liabilities		33.5			(23.2	)
Net cash provided by operating activities		908.8			440.9
Cash flows from investing activities:
Capital expenditures		(61.5	)		(88.8	)
Cash paid for acquisitions, net of cash and restricted cash acquired		(518.6	)		(1,049.5	)
Net proceeds from sales of operations/books of business		1.7			4.8
Net funding of investment transactions		0.8			4.5
Net funding of premium finance loans		78.0			63.9
Net cash used by investing activities		(499.6	)		(1,065.1	)
Cash flows from financing activities:
Payments on acquisition earnouts		(104.4	)		(72.5	)
Proceeds from issuance of common stock		93.5			66.0
Payments to noncontrolling interests		(4.1	)		(1.2	)
Dividends paid		(262.0	)		(235.9	)
Net change in fiduciary assets and liabilities		(103.1	)		1,727.0
Net borrowings on premium financing debt facility		(73.1	)		(53.2	)
Borrowings on line of credit facility		1,663.2			2,125.0
Repayments on line of credit facility		(1,826.9	)		(1,690.0	)
Net borrowings of corporate related long-term debt		567.5			643.7
Debt acquisition costs		(8.4	)		(8.6	)
Settlements on terminated interest rate swaps		(1.4	)		60.0
Net cash (used) provided by financing activities		(59.2	)		2,560.3
Effect of changes in foreign exchange rates on cash, cash equivalents,    restricted cash and fiduciary cash		(55.5	)		41.9
Net increase in cash, cash equivalents, restricted cash and fiduciary cash		294.5			1,978.0
Cash, cash equivalents, restricted cash and fiduciary cash at beginning of period		6,543.3			4,964.2
Cash, cash equivalents, restricted cash and fiduciary cash at end of period	$	6,837.8		$	6,942.2

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.

Consolidated Statement of Stockholders’ Equity

(Unaudited - in millions)

											Accumulated
					Capital in						Other
	Common Stock				Excess of			Retained			Comprehensive			Noncontrolling
	Shares		Amount		Par Value			Earnings			Loss			Interests			Total
Balance at December 31, 2023		216.7	$	216.7	$	7,297.8		$	4,052.9		$	(792.1	)	$	40.0		$	10,815.3
Net earnings		—		—		—			608.4			—			4.3			612.7
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			(0.3	)		(0.3	)
Dividends paid to noncontrolling    interests		—		—		—			—			—			(0.6	)		(0.6	)
Net change in pension asset/    liability, net of taxes of    $0.1 million		—		—		—			—			0.3			—			0.3
Foreign currency translation		—		—		—			—			(155.8	)		—			(155.8	)
Change in fair value of derivative    instruments, net of taxes of    $(0.4) million		—		—		—			—			(1.4	)		—			(1.4	)
Compensation expense related to    stock option plan grants		—		—		15.1			—			—			—			15.1
Common stock issued in:
Seven purchase transactions		0.4		0.4		87.9			—			—			—			88.3
Stock option plans		0.6		0.6		39.3			—			—			—			39.9
Employee stock purchase plan		0.1		0.1		12.1			—			—			—			12.2
Shares issued to benefit plans		0.4		0.4		98.1			—			—			—			98.5
Deferred compensation and    restricted stock		0.3		0.3		(48.3	)		—			—			—			(48.0	)
Cash dividends declared on    common stock		—		—		—			(132.0	)		—			—			(132.0	)
Balance at March 31, 2024		218.5	$	218.5	$	7,502.0		$	4,529.3		$	(949.0	)	$	43.4		$	11,344.2
Net earnings		—		—		—			283.4			—			2.0			285.4
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			(18.4	)		(18.4	)
Dividends paid to noncontrolling    interests		—		—		—			—			—			(0.3	)		(0.3	)
Net change in pension asset/    liability, net of taxes of    $0.0 million		—		—		—			—			(0.1	)		—			(0.1	)
Foreign currency translation		—		—		—			—			11.3			0.1			11.4
Change in fair value of derivative    instruments, net of taxes of    $(0.5) million		—		—		—			—			(1.4	)		—			(1.4	)
Compensation expense related to    stock option plan grants		—		—		10.5			—			—			—			10.5
Common stock issued in:
Two purchase transactions		0.2		0.2		45.3			—			—			—			45.5
Stock option plans		0.3		0.3		24.5			—			—			—			24.8
Employee stock purchase plan		—		—		16.5			—			—			—			16.5
Deferred compensation and    restricted stock		0.1		0.1		12.6			—			—			—			12.7
Cash dividends declared on    common stock		—		—		—			(131.5	)		—			—			(131.5	)
Balance at June 30, 2024		219.1	$	219.1	$	7,611.4		$	4,681.2		$	(939.2	)	$	26.8		$	11,599.3

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.
Consolidated Statement of Stockholders’ Equity
(Unaudited - in millions)

											Accumulated
					Capital in						Other
	Common Stock				Excess of			Retained			Comprehensive			Noncontrolling
	Shares		Amount		Par Value			Earnings			Loss			Interests			Total
Balance at December 31, 2022		211.9	$	211.9	$	6,509.9		$	3,562.2		$	(1,140.4	)	$	46.6		$	9,190.2
Net earnings		—		—		—			486.5			—			0.1			486.6
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			(5.4	)		(5.4	)
Dividends paid to noncontrolling    interests		—		—		—			—			—			(0.7	)		(0.7	)
Net change in pension asset/    liability, net of taxes of    $0.2 million		—		—		—			—			0.8			—			0.8
Foreign currency translation		—		—		—			—			33.3			(0.1	)		33.2
Change in fair value of derivative    instruments, net of taxes of    $1.3 million		—		—		—			—			4.9			—			4.9
Compensation expense related to    stock option plan grants		—		—		7.7			—			—			—			7.7
Common stock issued in:
Four purchase transactions		1.0		1.0		185.5			—			—			—			186.5
Stock option plans		0.5		0.5		20.7			—			—			—			21.2
Employee stock purchase plan		0.1		0.1		9.0			—			—			—			9.1
Shares issued to benefit plans		0.4		0.4		84.2			—			—			—			84.6
Deferred compensation and    restricted stock		0.3		0.3		(42.2	)		—			—			—			(41.9	)
Cash dividends declared on    common stock		—		—		—			(118.5	)		—			—			(118.5	)
Balance at March 31, 2023		214.2	$	214.2	$	6,774.8		$	3,930.2		$	(1,101.4	)	$	40.5		$	9,858.3
Net earnings		—		—		—			234.5			—			1.3			235.8
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			2.7			2.7
Dividends paid to noncontrolling    interests		—		—		—			—			—			(0.5	)		(0.5	)
Net change in pension asset/    liability, net of taxes of    $0.2 million		—		—		—			—			0.7			—			0.7
Foreign currency translation		—		—		—			—			193.5			0.3			193.8
Change in fair value of derivative    instruments, net of taxes of    $8.4 million		—		—		—			—			24.3			—			24.3
Compensation expense related to    stock option plan grants		—		—		7.8			—			—			—			7.8
Common stock issued in:
Three purchase transactions		0.8		0.8		177.8			—			—			—			178.6
Stock option plans		0.4		0.4		22.4			—			—			—			22.8
Employee stock purchase plan		0.1		0.1		12.9			—			—			—			13.0
Deferred compensation and    restricted stock		—		—		22.3			—			—			—			22.3
Cash dividends declared on    common stock		—		—		—			(119.6	)		—			—			(119.6	)
Balance at June 30, 2023		215.5	$	215.5	$	7,018.0		$	4,045.1		$	(882.9	)	$	44.3		$	10,440.0

See notes to consolidated financial statements.

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Notes to June 30, 2024 Consolidated Financial Statements (Unaudited)

1. Summary of Significant Accounting Policies

Terms Used in Notes to Consolidated Financial Statements

ASC - Accounting Standards Codification.

ASU - Accounting Standards Update.

FASB - The Financial Accounting Standards Board.

GAAP - U.S. generally accepted accounting principles.

IRC - Internal Revenue Code.

IRS - Internal Revenue Service.

Underwriting enterprises - Insurance companies, reinsurance companies and various other forms of risk-taking entities, including intermediaries of underwriting enterprises.

Nature of Operations and Basis of Presentation

Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us, Gallagher or the company, provide insurance and reinsurance brokerage, consulting and third party claims settlement and administration services to both domestic and international entities. We have three reportable segments: brokerage, risk management and corporate. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients.

Our brokerage segment operations provide brokerage and consulting services to entities of all types, including commercial, nonprofit, public sector entities, and, to a lesser extent, individuals, in the areas of insurance and reinsurance placements, risk of loss management, and management of employer sponsored benefit programs. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third‑party claims management organization rather than the claim services provided by underwriting enterprises. The corporate segment reports the financial information related to our debt and other corporate costs, clean energy investments, external acquisition‑related expenses and the impact of foreign currency translation.

We do not assume insurance underwriting risk on a net basis, other than with respect to de minimis amounts necessary to provide minimum or regulatory capital to organize captives, pools, specialized underwriters or risk-retention groups. Rather, capital necessary for covering losses is provided by underwriting enterprises.

Interest income, premium finance revenues and other income are primarily generated from our premium financing operations, our invested cash and restricted cash we hold on behalf of our clients, as well as clean energy investments. In addition, our share of the net earnings related to partially owned entities that are accounted for using the equity method is included in other income.

We are a global insurance brokerage, risk management and consulting services firm, headquartered in Rolling Meadows, Illinois. We provide these services in approximately 130 countries around the world through our owned operations and a network of correspondent brokers and consultants. We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in annual financial statements have been omitted pursuant to such rules and regulations. The unaudited consolidated financial statements included herein are, in the opinion of management, prepared on a basis consistent with our audited consolidated financial statements for the year ended December 31, 2023, and include all normal recurring adjustments necessary for a fair presentation of the information set forth herein. The quarterly results of operations are not necessarily indicative of the results of operations to be reported for subsequent quarters or the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. In the preparation of our unaudited consolidated financial statements as of June 30, 2024, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued, for potential recognition and/or disclosure therein.

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Use of Estimates

The preparation of our unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our unaudited consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in the notes herein.

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2. Effect of New Accounting Pronouncements

Segment Reporting

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires that an entity report segment information in accordance with Topic 280, Segment Reporting. The amendment in the ASU is intended to improve reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. We are currently evaluating the impact of the new standard on our consolidated financial statements which is expected to result in enhanced disclosures.

Income Taxes

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires that an entity, on an annual basis, disclose additional income tax information, primarily related to the rate reconciliation and income taxes paid. The amendment in the ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact of the new standard on our consolidated financial statements which is expected to result in enhanced disclosures.

Climate Risk Disclosures

In March 2024, the SEC issued final climate-related disclosure rules that will require disclosure of material climate-related risks and material direct greenhouse gas emissions from operations owned or controlled (Scope 1) and/or material indirect greenhouse gas emissions from purchased energy consumed in owned or controlled operations (Scope 2). Additionally, the rules require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions, subject to certain materiality thresholds. The disclosure requirements were scheduled to begin phasing in for annual reports and registration statements including financial information with respect to annual periods beginning in calendar year 2025. On April 4, 2024, the SEC issued an order staying the rules during the pendency of a number of legal challenges to the rules’ validity. We are continuing to monitor these developments while evaluating the impact of the rules on our consolidated financial statements, which are expected to result in additional disclosures.

3. Business Combinations

During the six-month period ended June 30, 2024, we acquired substantially all of the ownership interest or net assets, as applicable, of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data):

													Total		Maximum
	Common		Common								Recorded		Recorded		Potential
Name and Effective	Shares		Share				Accrued		Escrow		Earnout		Purchase		Earnout
Date of Acquisition	Issued		Value		Cash Paid		Liability		Deposited		Payable		Price		Payable
	(000s)
Ericson Insurance Services, LLC    January 1, 2024 (EIS)		129	$	30.1	$	26.5	$	—	$	3.0	$	7.0	$	66.6	$	10.0
The Rowley Agency, LLC    January 1, 2024 (TRA)		—		—		117.2		—		11.0		—		128.2		—
OperationsInc, LLC    June 1, 2024 (OPR)		—	$	—	$	52.6	$	—	$	2.8	$	11.0	$	66.4	$	20.0
Twenty-one other acquisitions    completed in 2024		229		48.8		271.3		2.6		16.8		53.3		392.8		108.5
		358	$	78.9	$	467.6	$	2.6	$	33.6	$	71.3	$	654.0	$	138.5

Common shares issued in connection with acquisitions are valued at closing market prices as of the effective date of the applicable acquisition or on the days when the shares are issued, if purchase consideration is deferred. We record escrow deposits that are returned to us as a result of adjustments to net assets acquired as reductions of goodwill when the escrows are settled. The maximum potential earnout payables disclosed in the foregoing table represent the maximum amount of additional consideration that could be paid pursuant to the terms of the purchase agreement for the applicable acquisition. The amounts recorded as earnout payables, which are primarily based upon the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date, are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration in the foregoing table. We will record subsequent changes in these estimated earnout obligations, including the accretion of discount, in our consolidated statement of earnings when incurred.

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The fair value of these earnout obligations is generally based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements, which is a Level 3 fair value measurement (discounted cash flow method of the income approach). In determining fair value, we estimated the acquired entity’s future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. Revenue growth rates generally ranged from 5.0% to 15.0% for our 2024 acquisitions. We estimated future payments using the earnout formula and performance targets specified in each purchase agreement and the financial projections just described. We then discounted these payments to present value using a risk-adjusted rate that takes into consideration market-based rates of return that reflect the ability of the acquired entity to achieve the targets. The discount rate was 9.0% for all of our 2024 acquisitions. In some instances, the fair value of these earnout obligations can be based on other valuation methods including the Black-Scholes Option Pricing Method or Monte Carlo Simulation method. Changes in financial projections, market participant assumptions for revenue growth and/or profitability, or the risk-adjusted discount rate, would result in a change in the fair value of recorded earnout obligations.

During the three-month periods ended June 30, 2024 and 2023, we recognized $15.0 million and $19.8 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. During the six-month periods ended June 30, 2024 and 2023, we recognized $33.8 million and $39.6 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. In addition, during the three-month periods ended June 30, 2024 and 2023, we recognized $3.8 million of expense and $10.4 million of income, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 30 and 34 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2024 and 2023, we recognized $31.1 million of income and $11.6 million of expense, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 58 and 45 acquisitions, respectively. The net adjustments in the three‑month period ended June 30, 2024, include changes made to the estimated fair value of the Willis Re acquisition earnout and reflect updated assumptions as of June 30, 2024. The aggregate amount of maximum earnout obligations related to acquisitions was $1,925.8 million as of June 30, 2024, of which $1,236.7 million was recorded in the consolidated balance sheet as of June 30, 2024, based on the estimated fair value of the expected future payments to be made, of which approximately $491.8 million can be settled in cash or stock at our option and $744.9 million must be settled in cash.

The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in the six-month period ended June 30, 2024 (in millions):

							Twenty-one Other
	EIS		TRA		OPR		Acquisitions		Total
Cash and cash equivalents	$	0.1	$	4.1	$	0.8	$	9.9	$	14.9
Fiduciary assets		1.0		2.6		—		34.1		37.7
Other current assets		3.5		0.5		2.7		11.3		18.0
Fixed assets		—		0.4		—		0.7		1.1
Noncurrent assets		0.1		1.7		2.0		3.8		7.6
Goodwill		27.4		65.8		41.9		205.9		341.0
Expiration lists		35.9		57.4		22.1		185.5		300.9
Non-compete agreements		0.5		0.6		0.2		6.2		7.5
Trade names		—		—		—		0.3		0.3
Total assets acquired		68.5		133.1		69.7		457.7		729.0
Fiduciary liabilities		1.0		2.6		—		34.1		37.7
Current liabilities		0.8		0.6		1.1		14.7		17.2
Noncurrent liabilities		0.1		1.7		2.2		16.1		20.1
Total liabilities assumed		1.9		4.9		3.3		64.9		75.0
Total net assets acquired	$	66.6	$	128.2	$	66.4	$	392.8	$	654.0

Among other things, these acquisitions allow us to expand into desirable geographic locations, further extend our presence in the retail and wholesale insurance and reinsurance brokerage markets and increase the volume of general services currently provided. The excess of the purchase price over the estimated fair value of the tangible net assets acquired at the acquisition date was allocated to goodwill, expiration lists, non-compete agreements and trade names in the amounts of $341.0 million, $300.9 million, $7.5 million and $0.3 million, respectively, within the brokerage segment.

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Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments. During this period, we may use independent third-party valuation specialists to assist us in finalizing the fair value of assets acquired and liabilities assumed. Fair value adjustments, if any, are most common to the values established for amortizable intangible assets, including expiration lists, non‑compete agreements and trade names, as well as for acquired software, and earnout liabilities, with the offset to goodwill, net of any income tax effect. Provisional estimates of fair value were used by us to initially record four acquisitions as of their acquisition date that were completed in the fourth quarter of 2023. We subsequently used independent third party valuation specialists to assist us in determining the fair value of assets acquired and liabilities assumed for these transactions, the valuations of which were completed in the three-month period ended June 30, 2024. Based on these valuations, we made adjustments to the amounts initially recorded for earnout liabilities, expiration lists, non-competes agreements, trade names and acquired software, which resulted in a net increase to goodwill of $256.7 million.

The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values. In general, the fair value of expiration lists was established using the excess earnings method, which is an income approach based on estimated financial projections developed by management for each acquired entity using market participant assumptions. Revenue growth and attrition rates generally ranged from 0.7% to 5.3% and 5.0% to 11.0%, respectively, for our 2023 acquisitions for which valuations were performed in 2024. We estimate the fair value as the present value of the benefits anticipated from ownership of the subject expiration list in excess of returns required on the investment in contributory assets necessary to realize those benefits. The rate used to discount the net benefits was based on a risk-adjusted rate that takes into consideration market-based rates of return and reflects the risk of the asset relative to the acquired business. The discount rates ranged from 9.5% to 11.0% for our 2023 acquisitions for which valuations were performed in 2024. The fair value of non-compete agreements was established using the profit differential method, which is an income approach based on estimated financial projections developed by management for the acquired company using market participant assumptions and various non-compete scenarios.

Expiration lists, non-compete agreements and trade names related to our acquisitions are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names), while goodwill is not subject to amortization. We use the straight-line method to amortize these intangible assets because the pattern of their economic benefits cannot be reasonably determined with any certainty. We review all of our identifiable intangible assets for impairment periodically (at least annually) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. In reviewing identifiable intangible assets, if the undiscounted future cash flows were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2024 we wrote off $14.0 million of amortizable assets related to the brokerage segment. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2023, we wrote off $3.1 million and $3.2 million, respectively, of amortizable assets related to the brokerage and risk management segments.

Of the $300.9 million of expiration lists, $7.5 million of non-compete agreements and $0.3 million of trade names related to our acquisitions made during the six-month period ended June 30, 2024, $52.1 million, $4.1 million and $0.3 million, respectively, are not expected to be deductible for income tax purposes. Accordingly, we recorded a deferred tax liability of $13.1 million and a corresponding amount of goodwill in the six-month period ended June 30, 2024, related to the nondeductible amortizable intangible assets.

Our unaudited consolidated financial statements for the six-month period ended June 30, 2024 include the operations of the entities acquired in the six-month period ended June 30, 2024 from their respective acquisition dates. The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2023 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Total revenues	$	2,785.4	$	2,478.5	$	6,061.9	$	5,223.0
Net earnings attributable to controlling interests		283.9		235.8		893.7		724.9
Basic net earnings per share		1.30		1.10		4.10		3.38
Diluted net earnings per share		1.27		1.07		4.02		3.32

The unaudited pro forma results above have been prepared for comparative purposes only and do not purport to be indicative of the results of operations which actually would have resulted had these acquisitions occurred at January 1, 2023, nor are they necessarily indicative of future operating results. Annualized revenues of entities acquired during the six-month period ended June 30, 2024 totaled approximately $141.2 million. For the six-month period ended June 30, 2024, total revenues, net pre-tax loss and net earnings before interest, income taxes, depreciation, amortization and the change in estimated acquisition earnout payables (EBITDAC)

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recorded in our unaudited consolidated statement of earnings related to our acquisitions made during the six-month period ended June 30, 2024 in the aggregate, were $42.8 million, $(5.0) million and $7.4 million, respectively.

4. Contracts with Customers

Contract Assets and Liabilities/Contract Balances

Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions):

	June 30, 2024		December 31, 2023
Unbilled receivables	$	1,536.6	$	1,093.7
Deferred contract costs		123.0		169.1
Deferred revenue		762.9		706.2

The unbilled receivables, which are included in accounts receivable in our consolidated balance sheet, primarily relate to our rights to consideration for work completed but not billed at the reporting date. These are transferred to the receivables when the client is billed. The deferred contract costs represent the costs we incur to fulfill a new or renewal contract with our clients prior to the effective date of the contract. These costs are expensed on the contract effective date. The deferred revenue in the consolidated balance sheet includes amounts that represent the remaining performance obligations under our contracts and amounts collected related to advanced billings and deposits received from customers that may or may not ultimately be recognized as revenues in the future. Deposits received from customers could be returned to the customers based on lesser actual transactional volume than originally billed volume.

Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions):

				Risk
	Brokerage			Management			Total
Deferred revenue at December 31, 2023	$	533.6		$	172.6		$	706.2
Incremental deferred revenue		417.5			45.5			463.0
Revenue recognized during the six-month period ended   June 30, 2024 included in deferred revenue at December 31, 2023		(343.5	)		(42.1	)		(385.6	)
Net change in collected billings/deposits received from customers		(22.8	)		(0.9	)		(23.7	)
Impact of change in foreign exchange rates		(2.2	)		(0.1	)		(2.3	)
Deferred revenue recognized from business acquisitions		5.3			—			5.3
Deferred revenue at June 30, 2024	$	587.9		$	175.0		$	762.9

Revenue recognized during the six-month period ended June 30, 2024 in the table above included revenue from 2023 acquisitions that would not be reflected in prior periods.

Remaining Performance Obligations

Remaining performance obligations represent the portion of the contract price for which work has not been performed. As of June 30, 2024, the aggregate amount of the contract price allocated to remaining performance obligations was $762.9 million. The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions):

	Brokerage		Risk Management		Total
2024 (remaining six months)	$	504.9	$	86.4	$	591.3
2025		64.2		38.9		103.1
2026		16.8		17.4		34.2
2027		1.0		13.0		14.0
2028		0.5		6.8		7.3
Thereafter		0.5		12.5		13.0
Total	$	587.9	$	175.0	$	762.9

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Deferred Contract Costs

We capitalize costs incurred to fulfill contracts as deferred contract costs which are included in other current assets in our consolidated balance sheet. Deferred contract costs were $123.0 million and $169.1 million as of June 30, 2024 and December 31, 2023, respectively. Capitalized fulfillment costs are amortized to expense on the contract effective date. The amount of amortization of the deferred contract costs was $362.9 million and $306.7 million for the six-month periods ended June 30, 2024 and 2023, respectively.

We have applied the practical expedient to recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less for our brokerage segment. These costs are included in compensation and operating expenses in our consolidated statement of earnings.

5. Intangible Assets

The carrying amount of goodwill at June 30, 2024 and December 31, 2023 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2024
United States	$	6,651.7	$	74.8	$	—	$	6,726.5
United Kingdom		2,503.1		18.4		—		2,521.5
Canada		606.8		—		—		606.8
Australia		522.6		234.5		—		757.1
New Zealand		197.0		9.2		—		206.2
Other foreign		1,078.5		—		18.9		1,097.4
Total goodwill	$	11,559.7	$	336.9	$	18.9	$	11,915.5
At December 31, 2023
United States	$	6,304.5	$	74.8	$	—	$	6,379.3
United Kingdom		2,493.4		18.5		—		2,511.9
Canada		623.7		—		—		623.7
Australia		514.6		135.9		—		650.5
New Zealand		204.2		9.6		—		213.8
Other foreign		1,077.4		—		19.0		1,096.4
Total goodwill	$	11,217.8	$	238.8	$	19.0	$	11,475.6

The changes in the carrying amount of goodwill for the six-month period ended June 30, 2024 are as follows (in millions):

	Brokerage			Risk Management			Corporate			Total
Balance as of December 31, 2023	$	11,217.8		$	238.8		$	19.0		$	11,475.6
Goodwill acquired during the period		341.0			—			—			341.0
Goodwill true-ups due to appraisals and other acquisition    adjustments (see Note 3)		94.4			102.0			—			196.4
Goodwill written-off related to sales of business and impairment		(5.8	)		—			—			(5.8	)
Foreign currency translation adjustments during the period		(87.7	)		(3.9	)		(0.1	)		(91.7	)
Balance as of June 30, 2024	$	11,559.7		$	336.9		$	18.9		$	11,915.5

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Major classes of amortizable intangible assets at June 30, 2024 and December 31, 2023 consist of the following (in millions):

	June 30,			December 31,
	2024			2023
Expiration lists	$	8,341.8		$	8,222.8
Accumulated amortization - expiration lists		(4,025.8	)		(3,733.2	)
		4,316.0			4,489.6
Non-compete agreements		103.3			112.2
Accumulated amortization - non-compete agreements		(79.9	)		(74.9	)
		23.4			37.3
Trade names		119.7			171.8
Accumulated amortization - trade names		(69.7	)		(65.4	)
		50.0			106.4
Net amortizable assets	$	4,389.4		$	4,633.3

Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):

2024 (remaining six months)	$	310.1
2025		587.5
2026		544.3
2027		510.5
2028		470.1
Thereafter		1,966.9
Total	$	4,389.4

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6. Credit and Other Debt Agreements

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2024			2023
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.40%, balloon due November 9, 2031	$	400.0		$	400.0
Semi-annual payments of interest, fixed rate of 5.50%, balloon due March 2, 2033		350.0			350.0
Semi-annual payments of interest, fixed rate of 6.50%, balloon due February 15, 2034		400.0			400.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due July 15, 2034		500.0			—
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			850.0
Semi-annual payments of interest, fixed rate of 3.05%, balloon due March 9, 2052		350.0			350.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due March 2, 2053		600.0			600.0
Semi-annual payments of interest, fixed rate of 6.75%, balloon due February 15, 2054		600.0			600.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due July 15, 2054		500.0			—
Total Senior Notes		4,550.0			3,550.0
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		—			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		—			325.0
Semi-annual payments of interest, fixed rate of 4.31%, balloon due June 24, 2025		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.85%, balloon due February 13, 2026		140.0			140.0
Semi-annual payments of interest, fixed rate of 4.73%, balloon due February 27, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.40%, balloon due June 2, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.36%, balloon due June 24, 2026		150.0			150.0
Semi-annual payments of interest, fixed rate of 3.75%, balloon due January 30, 2027		30.0			30.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due June 27, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due August 2, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.14%, balloon due August 4, 2027		98.0			98.0
Semi-annual payments of interest, fixed rate of 3.46%, balloon due December 1, 2027		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.55%, balloon due June 2, 2028		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 13, 2028		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.04%, balloon due February 13, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.98%, balloon due February 27, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due June 27, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due August 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.48%, balloon due December 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.99%, balloon due January 30, 2030		341.0			341.0
Semi-annual payments of interest, fixed rate of 4.44%, balloon due June 13, 2030		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.14%, balloon due March 13, 2031		180.0			180.0
Semi-annual payments of interest, fixed rate of 4.70%, balloon due June 2, 2031		25.0			25.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due January 30, 2032		69.0			69.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 27, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due August 2, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.59%, balloon due June 13, 2033		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.29%, balloon due March 13, 2034		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.48%, balloon due June 12, 2034		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.24%, balloon due January 30, 2035		79.0			79.0
Semi-annual payments of interest, fixed rate of 2.44%, balloon due February 10, 2036		100.0			100.0
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.69%, balloon due June 13, 2038		75.0			75.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due March 13, 2039		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.49%, balloon due January 30, 2040		56.0			56.0
Total Note Purchase Agreements		3,523.0			3,948.0
Credit Agreement:
Periodic payments of interest and principal, prime or SOFR plus up    to 1.075%, expires June 22, 2028		80.0			245.0
Premium Financing Debt Facility - expires October 31, 2025:
Facility B
AUD denominated tranche, interbank rates plus 1.500%		199.6			249.0
NZD denominated tranche, interbank rates plus 1.850%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.830%		—			31.4
NZD denominated tranche, interbank rates plus 0.990%		8.2			8.6
Total Premium Financing Debt Facility		207.8			289.0
Total corporate and other debt		8,360.8			8,032.0
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(46.8	)		(38.4	)
Less unamortized discount on Bonds Payable		(35.3	)		(28.6	)
Net corporate and other debt	$	8,278.7		$	7,965.0

Senior Notes - On February 12, 2024, we closed and funded an offering of $1,000.0 million of unsecured senior notes in two tranches. The $500.0 million aggregate principal amount of 5.45% Senior Notes is due in 2034 (which we refer to as the 2034 July Notes) and $500.0 million aggregate principal amount of 5.75% Senior Notes is due in 2054 (which we refer to as the 2054 July Notes). The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2023, we

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entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1.4 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

7. Earnings Per Share

The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Net earnings attributable to controlling interests	$	283.4	$	234.5	$	891.8	$	721.0
Weighted average number of common shares outstanding		218.8		214.9		218.1		213.8
Dilutive effect of stock options using the treasury    stock method		4.1		4.1		4.3		4.2
Weighted average number of common and common    equivalent shares outstanding		222.9		219.0		222.4		218.0
Basic net earnings per share	$	1.30	$	1.09	$	4.09	$	3.37
Diluted net earnings per share	$	1.27	$	1.07	$	4.01	$	3.31

Anti-dilutive stock-based awards of 1.0 million and 1.1 million shares were outstanding at the three-month periods ended June 30, 2024 and 2023, respectively, which were excluded in the computation of the dilutive effect of stock-based awards for the three-month periods then ended. Anti-dilutive stock-based awards of 0.7 million shares were outstanding at each the six-month periods ended June 30, 2024 and 2023, which were excluded in the computation of the dilutive effect of stock-based awards for the six-month periods then ended. These stock‑based awards were excluded from the computation because the exercise prices on these stock‑based awards were greater than the average market price of our common shares during the respective period, and therefore, would be anti‑dilutive to earnings per share under the treasury stock method.

8. Stock Option Plans

On May 10, 2022, our stockholders approved the Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (which we refer to as the 2017 LTIP). The LTIP term began May 10, 2022 and terminates on the date of the annual meeting of stockholders in 2032, unless terminated earlier by our board of directors. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. The compensation committee of our board of directors determines the annual number of shares delivered under the LTIP. The LTIP provides for non-qualified and incentive stock options, stock appreciation rights, restricted stock and restricted stock units, any or all of which may be made contingent upon the achievement of performance criteria.

Shares of our common stock available for issuance under the LTIP include authorized and unissued shares of common stock or authorized and issued shares of common stock reacquired and held as treasury shares or otherwise, or a combination thereof. The number of available shares will be reduced by the aggregate number of shares that become subject to outstanding awards granted under the LTIP. A maximum of 3.5 million shares issued for full value awards (i.e., awards other than stock options or stock appreciation rights) will be counted one-for-one against the 13.5 million share pool, and every share subject to a full value award in excess of such limit will count as 3.8 shares against the pool. To the extent that shares subject to an outstanding award granted under either the LTIP or prior equity plans are not issued or delivered by reason of the expiration, termination, cancellation or forfeiture of such award or by reason of the settlement of such award in cash, then such shares will again be available for grant under the LTIP.

The maximum number of shares available under the LTIP for restricted stock, restricted stock unit awards and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) was 2.5 million at June 30, 2024.

The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non-qualified stock options and stock appreciation rights. The compensation committee determines the period for the exercise of a non-qualified stock option, tax-qualified incentive stock option or stock appreciation right, provided that no option can be exercised later than seven years after its date of grant. The exercise price of a non-qualified stock option or tax-qualified incentive stock option and the base price of a stock appreciation right cannot be less than 100% of the fair market value of a share of our common stock on the date of grant,

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provided that the base price of a stock appreciation right granted in tandem with an option will be the exercise price of the related option.

Upon exercise, the option exercise price may be paid in cash, by the delivery of previously owned shares of our common stock, through a net-exercise arrangement, or through a broker-assisted cashless exercise arrangement. The compensation committee determines all of the terms relating to the exercise, cancellation or other disposition of an option or stock appreciation right upon a termination of employment, whether by reason of disability, retirement, death or any other reason. Stock option and stock appreciation right awards under the LTIP are non-transferable.

On March 1, 2024, the compensation committee granted 1,044,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2027, 2028 and 2029, respectively. On March 15, 2023, the compensation committee granted 1,131,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2026, 2027 and 2028, respectively. The 2024 and 2023 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment. Stock options granted in 2023 to certain executive officers age 55 or older are not subject to forfeiture upon such officers' departure from the company after two years from date of grant. Stock options granted in 2024 to executive officers are not subject to forfeiture upon such officers’ departure from the company once they attain the age of 62.

During the three-month periods ended June 30, 2024 and 2023, we recognized $10.5 million and $7.8 million, respectively, of compensation expense related to our stock option grants. During the six-month periods ended June 30, 2024 and 2023, we recognized $25.6 million and $15.5 million, respectively, of compensation expense related to our stock option grants.

For purposes of expense recognition, the estimated fair values of the stock option grants are amortized to expense over the options’ vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	2024			2023
Expected dividend yield		1.0	%		1.2	%
Expected risk-free interest rate		4.2	%		3.6	%
Volatility		25.3	%		25.0	%
Expected life (in years)		5.5			5.4

Option valuation models require the input of highly subjective assumptions including the expected stock price volatility. The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. The weighted average fair value per option for all options granted during the six-month periods ended June 30, 2024 and 2023, as determined on the grant date using the Black-Scholes option pricing model, was $69.55 and $46.48, respectively.

The following is a summary of our stock option activity and related information for 2024 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2024
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.9		$	123.85
Granted		1.0			243.54
Exercised		(1.0	)		76.40
Forfeited or canceled		(0.1	)		151.05
Ending balance		7.8		$	145.70		4.18	$	883.9
Exercisable at end of period		2.1		$	88.79		2.19	$	353.9
Ending unvested and expected to vest		5.2		$	164.50		4.86	$	494.1

Options with respect to 10.9 million shares (less any shares of restricted stock issued under the LTIP - see Note 10 to these unaudited consolidated financial statements) were available for grant under the LTIP at June 30, 2024.

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The total intrinsic value of options exercised during the six-month periods ended June 30, 2024 and 2023 was $173.7 million and $123.8 million, respectively. As of June 30, 2024, we had approximately $149.9 million of total unrecognized compensation expense related to nonvested options. We expect to recognize that cost over a weighted average period of approximately four years.

Other information regarding stock options outstanding and exercisable at June 30, 2024 is summarized as follows (in millions, except exercise price and year data):

					Options Outstanding						Options Exercisable
							Weighted
							Average
							Remaining		Weighted				Weighted
							Contractual		Average				Average
					Number		Term		Exercise		Number		Exercise
Range of Exercise Prices					Outstanding		(in years)		Price		Exercisable		Price
$	70.74	—	$	70.74		0.4		0.71	$	70.74		0.4	$	70.74
	79.59	—		79.59		0.7		1.70		79.59		0.7		79.59
	86.17	—		86.17		1.1		2.70		86.17		0.6		86.17
	127.90	—		127.90		1.4		3.71		127.90		0.4		127.90
	156.85	—		156.85		1.0		4.59		156.85		—		—
	158.56	—		161.14		1.1		4.72		158.65		—		—
	177.09	—		202.13		1.1		5.72		177.78		—		—
	238.88	—		243.54		1.0		6.67		243.54		—		—
$	70.74	—	$	243.54		7.8		4.18	$	145.70		2.1	$	88.79

9. Deferred Compensation

We have a Deferred Equity Participation Plan (which we refer to as the DEPP), which is a non-qualified plan that generally provides for distributions to certain of our key executives when they reach age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later. Under the provisions of the DEPP, we typically contribute cash in an amount approved by the compensation committee to a rabbi trust on behalf of the executives participating in the DEPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. Distributions under the DEPP may not normally be made until the participant reaches age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) and are subject to forfeiture in the event of voluntary termination of employment or termination for cause prior to then. DEPP awards are generally made annually in the first quarter. In addition, we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65. All contributions to the plan (including sub-plans) deemed to be invested in shares of our common stock are distributed in the form of our common stock and all other distributions are paid in cash.

Our common stock that is issued to or purchased by the rabbi trust as a contribution under the DEPP is valued at historical cost, which equals its fair market value at the date of grant or date of purchase. When common stock is issued, we record an unearned deferred compensation obligation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock owed to the participants do not have any impact on the amounts recorded in our unaudited consolidated financial statements.

In the first quarters of 2024 and 2023, the compensation committee approved $23.2 million and $25.1 million, respectively, of awards in the aggregate to certain key executives under the DEPP that were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. We contributed cash to the rabbi trust and instructed the trustee to acquire a specified number of shares of our common stock on the open market to fund these 2024 and 2023 awards. During the three-month periods ended June 30, 2024 and 2023, we charged $5.6 million and $5.9 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $9.6 million and $9.9 million, respectively, to compensation expense related to these awards.

In the first quarters of 2024 and 2023, the compensation committee approved $2.3 million and $3.0 million, respectively, of awards under the sub-plans referred to above, which were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. During the three-month periods ended June 30, 2024 and 2023, we charged $0.6 million and $0.8 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $1.1 million and $1.4 million, respectively, to compensation expense related to these awards. There were $2.3 million of distributions from the

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sub-plans during the six-month period ended June 30, 2024. There were $6.4 million of distributions from the sub‑plans during the six-month period ended June 30, 2023.

At June 30, 2024 and December 31, 2023, we recorded $95.5 million (related to 2.3 million shares) and $81.1 million (related to 2.2 million shares), respectively, of unearned deferred compensation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet. The total intrinsic value of our unvested equity-based awards under the plan at June 30, 2024 and December 31, 2023 was $584.4 million and $504.9 million, respectively. During the six-month periods ended June 30, 2024 and 2023, cash and equity awards with an aggregate fair value of $17.9 million and $9.4 million, respectively, were vested and distributed to executives under the DEPP.

We have a Deferred Cash Participation Plan (which we refer to as the DCPP), which is a non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the provisions of the DCPP, we typically contribute cash in an amount approved by the compensation committee to the rabbi trust on behalf of the executives participating in the DCPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. In the first quarters of 2024 and 2023, the compensation committee approved $8.1 million and $9.8 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. During the three-month periods ended June 30, 2024 and 2023, we charged $5.1 million and $4.2 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $9.9 million and $8.0 million, respectively, to compensation expense related to these awards. There were $13.6 million of distributions from the DCPP during the six-month period ended June 30, 2024. There were $19.5 million of distributions from the DCPP during the six-month period ended June 30, 2023.

10. Restricted Stock, Performance Share and Cash Awards

Restricted Stock Awards

As discussed in Note 8 to these unaudited consolidated financial statements, on May 10, 2022, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2017 LTIP. The LTIP provides for the grant of a stock award either as restricted stock or as restricted stock units to officers, employees and non-employee directors. In either case, the compensation committee may determine that the award will be subject to the attainment of performance measures over an established performance period. Stock awards and the related dividend equivalents are non-transferable and subject to forfeiture if the holder does not remain continuously employed with us during the applicable restriction period or, in the case of a performance-based award, if applicable performance measures are not attained. The compensation committee will determine all of the terms relating to the satisfaction of performance measures and the termination of a restriction period, or the forfeiture and cancellation of a restricted stock award upon a termination of employment, whether by reason of disability, retirement, death or any other reason.

The agreements awarding restricted stock units under the LTIP will specify whether such awards may be settled in shares of our common stock, cash or a combination of shares and cash and whether the holder will be entitled to receive dividend equivalents, on a current or deferred basis, with respect to such award. Prior to the settlement of a restricted stock unit, the holder of a restricted stock unit will have no rights as a stockholder of the company. The maximum number of shares available under the LTIP for restricted stock, restricted stock units and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 4.0 million. At June 30, 2024, 2.5 million shares were available for grant under the LTIP for such awards.

In the first quarters of 2024 and 2023, we granted 345,000 and 378,000 restricted stock units, respectively, to employees under the LTIP, with an aggregate fair value of $83.9 million and $67.0 million, respectively, at the date of grant. These 2024 and 2023 awards of restricted stock units vest in full based on continued employment through March 1, 2029 and March 15, 2028, respectively.

We account for restricted stock awards at historical cost, which equals its fair market value at the date of grant, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our unaudited consolidated financial statements. During the three-month periods ended June 30, 2024 and 2023, we recognized $14.1 million and $11.0 million, respectively, to compensation expense related to restricted stock unit awards granted in 2017 through 2023. During the six-month periods ended June 30, 2024 and 2023, we recognized $27.0 million and $20.7 million, respectively, to compensation expense related to restricted stock unit awards granted in 2017 through 2023. The total intrinsic value of unvested restricted stock units at June 30, 2024 and 2023 was $512.7 million and $460.5 million, respectively. During the six-month periods ended June 30, 2024 and 2023, equity awards (including accrued dividends) with an aggregate value of $93.3 million and $62.0 million, respectively, were vested and distributed to employees under this plan.

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Performance Share Awards

On March 1, 2024 and March 15, 2023, pursuant to the LTIP, respectively, the compensation committee approved 58,000 and 58,000, respectively, of provisional performance share awards, with an aggregate fair value of $14.2 million and $10.3 million, respectively, for future grants to our officers. Each performance share award was equivalent to the value of one share of our common stock on the date such provisional award was approved. At the end of the performance period, eligible participants will receive a number of earned shares based on the growth in adjusted EBITDAC per share (as defined in our 2024 Proxy Statement). Earned shares for the 2024 and 2023 provisional awards will fully vest based on continuous employment through March 1, 2027 and March 15, 2026, respectively, and will be settled in unrestricted shares of our common stock on a one-for-one basis as soon as practicable thereafter. The 2024 and 2023 awards are subject to a three-year performance period that began on January 1, 2024 and 2023, respectively, and vest on the three-year anniversary of the date of grant (March 1, 2027 and March 15, 2026). Performance share awards granted in 2023 to certain executive officers age 55 or older are not subject to forfeitures upon such officers' departure from the company after two years from date of grant. Performance share awards granted in 2024 to executive officers are not subject to forfeiture upon such officers’ departure from the company once they attain the age of 62. In each case, the awards vest on a pro rata basis based on the number of months rounded up during which the officer was employed during the three-year performance period. During the three-month periods ended June 30, 2024 and 2023, we recognized $5.6 million and $3.8 million, respectively, to compensation expense related to performance share awards granted in 2020 through 2024. During the six-month periods ended June 30, 2024 and 2023, we recognized $10.6 million and $8.5 million, respectively, to compensation expense related to performance share awards granted in 2020 through 2024. The total intrinsic value of unvested performance share awards at June 30, 2024 and 2023 was $85.2 million and $64.3 million, respectively. During the six-month periods ended June 30, 2024 and 2023, equity awards (including accrued dividends) with an aggregate fair value of $31.6 million and $28.9 million, respectively, were vested and distributed to employees under this plan.

Cash Awards

Pursuant to our Performance Unit Program (which we refer to as the Program), there were no units granted in the six-month periods ended June 30, 2024 and 2023. The Program consists of a one-year performance period based on our financial performance and a three-year vesting period measured from January 1 of the year of grant. At the discretion of the compensation committee and determined based on our performance, the eligible officer or key employee will be granted a percentage of the provisional cash award units that equates to the EBITDAC growth achieved (as defined in the Program). At the end of the performance period, eligible participants will be granted a number of units based on achievement of the performance goal and subject to approval by the compensation committee. Granted units will fully vest based on continuous employment through the three-year vesting period. The ultimate award value will be equal to the trailing twelve-month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date. The fair value of the awarded units will be paid out in cash as soon as practicable. If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited.

On March 15, 2022, pursuant to the Program, the compensation committee approved provisional cash awards of $19.9 million in the aggregate for future grants to our officers and key employees that are denominated in units (125,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. During the three-month periods ended June 30, 2024 and 2023, we recognized $3.3 million and $3.1 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we recognized $6.7 million and $5.7 million, respectively, to compensation expense related to these awards.

On March 16, 2021, pursuant to the Program, the compensation committee approved provisional cash awards of $18.8 million in the aggregate for future grants to our officers and key employees that are denominated in units (147,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. Based on our performance for 2021, we granted 143,000 units under the Program in the first quarter of 2022 that fully vested on January 1, 2024. During the three and six-month periods ended June 30, 2023, we recognized $3.2 million and $6.5 million, respectively, to compensation expense related to these awards.

During the six-month period ended June 30, 2024, cash awards related to the 2021 provisional award with an aggregate fair value of $25.4 million (129,000 units in the aggregate) were vested and distributed to employees under the program. During the six-month period ended June 30, 2023, cash awards related to the 2020 provisional award with an aggregate fair value of $24.7 million (191,000 units in the aggregate) were vested and distributed to employees under the Program.

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11. Derivatives and Hedging Activity

We are exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, we enter into various derivative instruments that reduce these risks by creating offsetting exposures. We generally do not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

We are exposed to foreign exchange risk when we earn revenues, pay expenses, or enter into monetary intercompany transfers denominated in a currency that differs from our functional currency, or other transactions that are denominated in a currency other than our functional currency. We use foreign exchange derivatives, typically forward contracts and options, to reduce our overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than three years.

Interest Rate Risk Management

We enter into various long-term debt agreements. We use interest rate derivatives, typically swaps, to reduce our exposure to the effects of interest rate fluctuations on the forecasted interest rates for up to three years into the future.

We have not received or pledged any collateral related to derivative arrangements at June 30, 2024.

The notional and fair values of derivatives designated as hedging instruments are as follows at June 30, 2024 and December 31, 2023 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2024
Interest rate contracts	$	—	Other current assets	$	—	Accrued compensation and other current liabilities	$	—
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		46.4	Other current assets		4.9	Accrued compensation and other current liabilities		2.6
			Other noncurrent assets		10.1	Other noncurrent liabilities		4.1
Total	$	46.4		$	15.0		$	6.7
At December 31, 2023
Interest rate contracts	$	150.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	5.7
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		67.8	Other current assets		3.9	Accrued compensation and other current liabilities		3.9
			Other noncurrent assets		14.2	Other noncurrent liabilities		4.0
Total	$	217.8		$	18.1		$	13.6

(1)Included within foreign exchange contracts at June 30, 2024 were $819.3 million of call options, offset with $819.3 million of put options, and $3.0 million of buy forwards, offset with $49.4 million of sell forwards. Included within foreign exchange contracts at December 31, 2023 were $331.3 million of call options, offset with $331.3 million of put options, and $5.5 million of buy forwards, offset with $73.3 million of sell forwards.

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The effect of cash flow hedge accounting on accumulated other comprehensive loss for the six-month periods ended June 30, 2024 and 2023 was as follows (in millions):

							Amount of
				Amount of			Gain
				Gain (Loss)			Recognized
	Amount of			Reclassified			in Earnings
	Gain (Loss)			from			Related to
	Recognized in			Accumulated			Amount
	Accumulated			Other			Excluded
	Other			Comprehensive			from
	Comprehensive			Loss into			Effectiveness		Statement of Earnings
Instrument	Loss (1)			Earnings			Testing		Classification
Three-month period ended June 30, 2024
Interest rate contracts	$	(3.6	)	$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		(0.4	)		(1.0	)		—	Commission revenue
					(0.4	)		0.2	Compensation expense
					(0.4	)		0.2	Operating expense
Total	$	(4.0	)	$	(2.1	)	$	0.4
Three-month period ended June 30, 2023
Interest rate contracts	$	18.9		$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		12.8			0.2			—	Commission revenue
					(0.5	)		0.4	Compensation expense
					(0.4	)		0.3	Operating expense
Total	$	31.7		$	(1.0	)	$	0.7
Six-month period ended June 30, 2024
Interest rate contracts	$	(2.9	)	$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		(3.8	)		(0.8	)		—	Commission revenue
					(0.9	)		0.5	Compensation expense
					(0.7	)		0.4	Operating expense
Total	$	(6.7	)	$	(3.0	)	$	0.9
Six-month period ended June 30, 2023
Interest rate contracts	$	8.8		$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		28.7			0.8			—	Commission revenue
					(1.0	)		1.0	Compensation expense
					(0.7	)		0.7	Operating expense
Total	$	37.5		$	(1.5	)	$	1.7

(1)For the three and six-month periods ended June 30, 2024, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of $0.1 million and a gain of $0.2 million, respectively. For the three and six-month periods ended June 30, 2023, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $0.3 million and $0.8 million, respectively.

We estimate that approximately $13.0 million of pretax gain currently included within accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

12. Commitments, Contingencies and Off-Balance Sheet Arrangements

In connection with our investing and operating activities, we have entered into certain contractual obligations and commitments. Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the Senior Notes, Note

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Purchase Agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase obligations at June 30, 2024 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2024			2025			2026			2027			2028			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	4,550.0		$	4,550.0
Note Purchase Agreements		—			200.0			640.0			478.0			200.0			2,005.0			3,523.0
Credit Agreement		80.0			—			—			—			—			—			80.0
Premium Financing Debt Facility		207.8			—			—			—			—			—			207.8
Interest on debt		184.4			374.0			355.0			336.7			317.2			4,285.8			5,853.1
Total debt obligations		472.2			574.0			995.0			814.7			517.2			10,840.8			14,213.9
Operating lease obligations		54.2			108.9			90.5			73.3			55.8			92.4			475.1
Less sublease arrangements		(1.2	)		(1.8	)		(1.7	)		(1.6	)		(1.1	)		(0.8	)		(8.2	)
Outstanding purchase obligations		80.0			71.6			29.0			23.3			16.9			48.3			269.1
Total contractual obligations	$	605.2		$	752.7		$	1,112.8		$	909.7		$	588.8		$	10,980.7		$	14,949.9

The amounts presented in the table above may not necessarily reflect our actual future cash funding requirements, because the actual timing of the future payments made may vary from the stated contractual obligation.

Senior Notes, Note Purchase Agreements, Credit Agreement and Premium Financing Debt Facility - See Note 6 to these unaudited consolidated financial statements for a summary of the amounts outstanding under the Senior Notes, Note Purchase Agreements, the Credit Agreement and Premium Financing Debt Facility.

Operating Lease Obligations - Our corporate segment’s executive offices and certain subsidiary and branch facilities of our brokerage and risk management segments are located in a building we own at 2850 Golf Road, Rolling Meadows, Illinois, where we have approximately 360,000 square feet of space.

We generally operate in leased premises at our other locations. Certain of these leases have options permitting renewals for additional periods. In addition to minimum fixed rentals, a number of leases contain annual escalation clauses which are generally related to increases in an inflation index.

We have leased certain office space to several non-affiliated tenants under operating sublease arrangements. In the normal course of business, we expect that certain of these leases will not be renewed or replaced. We adjust charges for real estate taxes and common area maintenance annually based on actual expenses, and we recognize the related revenues in the year in which the expenses are incurred. These amounts are not included in the minimum future rentals to be received in the contractual obligations table above.

Outstanding Purchase Obligations - The amount disclosed in the contractual obligations table above represents the aggregate amount of unrecorded purchase obligations that we had outstanding at June 30, 2024. These obligations represent agreements to purchase goods or services that were executed in the normal course of business.

Off-Balance Sheet Commitments - Our total unrecorded commitments associated with outstanding letters of credit, and financial guarantees as of June 30, 2024 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2024		2025		2026		2027		2028		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	23.7	$	23.7
Financial guarantees		1.0		—		—		—		—		—		1.0
Total commitments	$	1.0	$	—	$	—	$	—	$	—	$	23.7	$	24.7

Since commitments may expire unused, the amounts presented in the table above do not necessarily reflect our actual future cash funding requirements. See the Off‑Balance Sheet Debt section below for a discussion of our letters of credit. All of the letters of credit represent multiple year commitments that have annual, automatic renewing provisions and are classified by the latest commitment date.

Since January 1, 2002, we have acquired 725 companies, all of which were accounted for using the acquisition method for recording business combinations. Substantially all of the purchase agreements related to these acquisitions contain provisions for potential earnout obligations. For all of our acquisitions made in the period from 2020 to 2024 that contain potential earnout obligations, such

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obligations are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration for the respective acquisition. The amounts recorded as earnout payables are primarily based upon estimated future potential operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The aggregate amount of the maximum earnout obligations related to these acquisitions was $1,925.8 million, of which $1,236.7 million was recorded in our consolidated balance sheet as of June 30, 2024 based on the estimated fair value of the expected future payments to be made, of which approximately $491.8 million can be settled in cash or stock at our option and $744.9 million must be settled in cash.

Off-Balance Sheet Debt - Our unconsolidated investment portfolio includes investments in enterprises where our ownership interest is between 1% and 50%, in which management has determined that our level of influence and economic interest is not sufficient to require consolidation. As a result, these investments are accounted for under the equity method. None of these unconsolidated investments had any outstanding debt at June 30, 2024 or December 31, 2023, that was recourse to us.

At June 30, 2024, we had posted two letters of credit totaling $9.3 million, in the aggregate, related to our self‑insurance deductibles, for which we had a recorded liability of $14.0 million. We have an equity investment in a rent-a-captive facility, which we use as a placement facility for certain of our insurance brokerage operations. At June 30, 2024, we had posted eight letters of credit totaling $13.0 million to allow certain of our captive operations to meet minimum statutory surplus requirements plus additional collateral related to premium and claim funds held in a fiduciary capacity, one letter of credit totaling $0.9 million for collateral related to claim funds held in a fiduciary capacity by a recent acquisition and one letter of credit totaling $0.5 million as a security deposit for a 2015 acquisition’s lease. These letters of credit have never been drawn upon.

Litigation, Regulatory and Taxation Matters - We routinely are involved in legal proceedings, claims, disputes, regulatory matters and governmental inspections or investigations arising in the ordinary course of or incidental to our business, including those noted below in this section. We record accruals in the unaudited consolidated financial statements for pending litigation when we determine that an unfavorable outcome is probable and the amount of the loss can be reasonably estimated. For the matters we disclose that do not include an estimate of the amount of loss or range of losses, such an estimate is not possible or is immaterial, and we may be unable to estimate the possible loss or range of losses that could potentially result from the application of non-monetary remedies, unless disclosed below. We currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations or cash flows. However, legal proceedings and government investigations are subject to inherent uncertainties, and unfavorable rulings or other adverse events could occur, including the payment of substantial monetary damages or an injunction or other order prohibiting us from selling one or more products at all or in particular ways, precluding particular business practices or requiring other remedies, which may result in a material adverse impact on our business, results of operations or financial position.

As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services business has been under audit by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promoter in connection with these operations. Additionally, the IRS is conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not a target of the criminal investigation. We are fully cooperating with both matters.

Contingent Liabilities - We purchase insurance to provide protection from errors and omissions (which we refer to as E&O) claims that may arise during the ordinary course of business. Currently we retain the first $15.0 million of each and every E&O claim. In addition, we retain, in aggregate, up to another $2.0 million between $15.0 million and $100.0 million, plus up to another $10.0 million between $100.0 million and $225.0 million, and up to another $20.0 million between $225.0 million and $400.0 million. We have historically maintained self-insurance reserves for the portion of our E&O exposure that is not insured. We periodically determine a range of possible reserve levels using actuarial techniques that rely heavily on projecting historical claim data into the future. Our E&O reserve in the June 30, 2024 consolidated balance sheet is above the lower end of the most recently determined actuarial range by $6.2 million and below the upper end of the actuarial range by $8.8 million. We can make no assurances that the historical claim data used to project the current reserve levels will be indicative of future claim activity. Thus, the E&O reserve level and corresponding actuarial range could change in the future as more information becomes known, which could materially impact the amounts reported and disclosed herein.

Tax-advantaged Investments No Longer Held - Between 1996 and 2007, we developed and then sold portions of our ownership in various energy related investments, many of which qualified for tax credits under IRC Section 29. We recorded tax benefits in connection with our ownership in these investments. At June 30, 2024, we had exposure on $108.0 million of previously earned tax credits. Under the Tax Cuts and Jobs Act, a portion of these previously earned tax credits were refunded in 2019 for tax year 2018, according to a specific formula. Under the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), which was passed on March 27, 2020, we accelerated the refund of all remaining credits on April 17, 2020, and the remaining credits were refunded to us in the second quarter of 2020. In 2004, 2007 and 2009, the IRS examined several of these investments and all examinations were closed without any changes being proposed by the IRS. However, any future adverse tax audits, administrative rulings or judicial decisions could disallow previously claimed tax credits.

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Due to the contingent nature of this exposure and our related assessment of its likelihood, no reserve has been recorded in our June 30, 2024 consolidated balance sheet related to this exposure.

13. Supplemental Disclosures of Cash Flow Information

	Six-month period ended June 30,
Supplemental disclosures of cash flow information (in millions):	2024		2023
Interest paid	$	162.1	$	127.3
Income taxes paid, net		167.8		116.7

The following is a reconciliation of our end of period cash, cash equivalents, restricted cash and fiduciary cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2024 and 2023 (in millions):

	June 30,
	2024		2023
Cash and cash equivalents - non-restricted cash	$	1,219.2	$	777.9
Cash and cash equivalents - restricted cash		196.1		174.4
Total cash and cash equivalents		1,415.3		952.3
Fiduciary cash		5,422.5		5,989.9
Total cash, cash equivalents, restricted cash and fiduciary cash	$	6,837.8	$	6,942.2

Fiduciary cash is included in fiduciary assets in our consolidated balance sheet.

We have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan’s age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5.0% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning in 2021, the amount matched by the company will be discretionary and annually determined by management. Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or company stock. We expensed (net of plan forfeitures) $56.0 million and $42.3 million related to the plan in the six-month periods ended June 30, 2024 and 2023, respectively. During 2023, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2023 plan year to be funded with our common stock, which was funded in February 2024. During 2022, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2022 plan year to be funded with our common stock, which was funded in February 2023.

14. Accumulated Other Comprehensive Loss

The after-tax components of our accumulated other comprehensive loss attributable to controlling interests consist of the following (in millions):

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2023	$	(37.1	)	$	(867.4	)	$	112.4		$	(792.1	)
Net change in period		0.2			(144.5	)		(2.8	)		(147.1	)
Balance as of June 30, 2024	$	(36.9	)	$	(1,011.9	)	$	109.6		$	(939.2	)

The foreign currency translation during the six-month period ended June 30, 2024 relates to the net impact of changes in the value of the local currencies relative to the U.S. dollar for our operations in the Australia, Canada, the Caribbean, India, New Zealand, the U.K. and other non-U.S. locations. The reporting currency for our financial statements is the U.S. dollar. Certain of our assets, liabilities, expenses and revenues are denominated in currencies other than the U.S. dollar, primarily the Australian dollar, British pound, Canadian dollar and New Zealand dollar. To prepare our unaudited consolidated financial statements, we must translate those assets, liabilities, expenses and revenues into U.S. dollars at the applicable exchange rates. Assets and liabilities of non-U.S. dollar functional currency operations are translated into U.S. dollars at end-of-period exchange rates while revenues, expenses and cash flows are translated at average monthly exchange rates over the period. Equity is translated at historical exchange rates and the resulting cumulative translation adjustments are included as a component of accumulated other comprehensive loss in the consolidated balance

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sheet. The net change in the foreign currency translation during the six-month period ended June 30, 2024 primarily relates to goodwill (see Note 5 for the impact on goodwill) and amortizable intangible assets held by operations with a non-U.S. dollar functional currency.

During the six-month periods ended June 30, 2024 and 2023, $1.0 million and $2.6 million, of expense, respectively, related to the pension liability was reclassified from accumulated other comprehensive loss to compensation expense in the statement of earnings. During the six-month periods ended June 30, 2024 and 2023, $3.0 million and $1.5 million of expense, respectively, related to the fair value of derivative investments, was reclassified from accumulated other comprehensive loss to the statement of earnings. During the six-month periods ended June 30, 2024 and 2023, no amounts related to foreign currency translation were reclassified from accumulated other comprehensive loss to the statement of earnings.

15. Segment Information

We have three reportable segments: brokerage, risk management and corporate.

The brokerage segment is primarily comprised of our retail and wholesale insurance and reinsurance brokerage operations. The brokerage segment (which comprises our retail property/casualty, wholesale, reinsurance, benefits and captive operations) generates revenues through commissions paid by underwriting enterprises and through fees charged to our clients. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients and we do not assume net underwriting risks.

The risk management segment provides contract claim settlement and administration services for commercial, nonprofit, captive and public sector entities, and various organizations that choose to self-insure some or all of their property/casualty coverages and for underwriting enterprises that choose to outsource some or all of their property/casualty claims departments. These operations also provide claims management, loss control consulting and insurance property appraisal services. Revenues are principally generated on a negotiated per-claim or per-service fee basis. Our risk management segment also provides risk management consulting services that are recognized as the services are delivered.

The corporate segment manages our clean energy and other investments. In addition, the corporate segment reports the financial information related to our debt and other corporate costs, external acquisition-related expenses and the impact of foreign currency remeasurements.

Allocations of interest income and certain expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. We allocate the provision for income taxes to the brokerage and risk management segments using the local country statutory rates. Reported operating results by segment would change if different methods were applied.

Financial information relating to our segments for the three and six-month periods ended June 30, 2024 and 2023 as follows

(in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Brokerage
Total revenues	$	2,376.3		$	2,088.4		$	5,241.2		$	4,463.6
Earnings before income taxes	$	446.3		$	390.5		$	1,322.4		$	1,081.4
Identifiable assets at June 30, 2024 and 2023							$	58,776.7		$	50,623.8
Risk Management
Total revenues	$	398.0		$	353.6		$	789.4		$	684.4
Earnings before income taxes	$	65.4		$	49.9		$	118.6		$	95.4
Identifiable assets at June 30, 2024 and 2023							$	1,683.4		$	1,212.8
Corporate
Total revenues	$	1.1		$	(0.1	)	$	1.5		$	—
Loss before income taxes	$	(146.1	)	$	(143.0	)	$	(302.7	)	$	(273.6	)
Identifiable assets at June 30, 2024 and 2023							$	2,547.6		$	2,528.6
Total
Total revenues	$	2,775.4		$	2,441.9		$	6,032.1		$	5,148.0
Earnings before income taxes	$	365.6		$	297.4		$	1,138.3		$	903.2
Identifiable assets at June 30, 2024 and 2023							$	63,007.7		$	54,365.2

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Disaggregation of Revenue

We disaggregate our revenue from contracts with clients by type and geographic location for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

Revenues by type and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,661.8	$	—	$	—	$	1,661.8
Fees		477.6		349.5		—		827.1
Supplemental revenues		88.7		—		—		88.7
Contingent revenues		59.8		—		—		59.8
Interest income, premium finance revenues and other income		88.4		9.1		1.1		98.6
Revenues before reimbursements		2,376.3		358.6		1.1		2,736.0
Reimbursements		—		39.4		—		39.4
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

Revenues by type and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,655.4	$	—	$	—	$	3,655.4
Fees		1,084.3		694.0		—		1,778.3
Supplemental revenues		182.6		—		—		182.6
Contingent revenues		145.8		—		—		145.8
Interest income, premium finance revenues and other income		173.1		17.4		1.5		192.0
Revenues before reimbursements		5,241.2		711.4		1.5		5,954.1
Reimbursements		—		78.0		—		78.0
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by geographical location and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,394.6	$	324.2	$	1.1	$	1,719.9
United Kingdom		574.6		14.0		—		588.6
Australia		90.9		56.0		—		146.9
Canada		110.3		1.7		—		112.0
New Zealand		55.9		2.1		—		58.0
Other foreign		150.0		—		—		150.0
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

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Revenues by geographical location and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	3,208.6	$	644.7	$	1.5	$	3,854.8
United Kingdom		1,159.4		28.0		—		1,187.4
Australia		158.9		109.0		—		267.9
Canada		213.4		3.4		—		216.8
New Zealand		97.6		4.3		—		101.9
Other foreign		403.3		—		—		403.3
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by type and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
Commissions	$	1,410.4	$	—	$	—		$	1,410.4
Fees		478.5		312.0		—			790.5
Supplemental revenues		71.2		—		—			71.2
Contingent revenues		54.2		—		—			54.2
Interest income, premium finance revenues and other income		74.1		6.6		(0.1	)		80.6
Revenues before reimbursements		2,088.4		318.6		(0.1	)		2,406.9
Reimbursements		—		35.0		—			35.0
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

Revenues by type and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,157.8	$	—	$	—	$	3,157.8
Fees		891.2		605.0		—		1,496.2
Supplemental revenues		152.8		—		—		152.8
Contingent revenues		126.0		—		—		126.0
Interest income, premium finance revenues and other income		135.8		11.2		—		147.0
Revenues before reimbursements		4,463.6		616.2		—		5,079.8
Reimbursements		—		68.2		—		68.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

Revenues by geographical location and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
United States	$	1,199.7	$	298.7	$	(0.1	)	$	1,498.3
United Kingdom		527.6		11.6		—			539.2
Australia		83.8		37.5		—			121.3
Canada		104.6		1.5		—			106.1
New Zealand		53.0		4.3		—			57.3
Other foreign		119.7		—		—			119.7
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

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Revenues by geographical location and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	2,675.0	$	578.8	$	—	$	3,253.8
United Kingdom		1,041.1		22.9		—		1,064.0
Australia		148.0		71.5		—		219.5
Canada		198.3		3.0		—		201.3
New Zealand		91.0		8.2		—		99.2
Other foreign		310.2		—		—		310.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The discussion and analysis that follows relates to our financial condition and results of operations for the six-month period ended June 30, 2024. Readers should review this information in conjunction with the June 30, 2024 unaudited consolidated financial statements and notes included in Item 1 of Part I of this quarterly report on Form 10‑Q and the audited consolidated financial statements and notes, and Management’s Discussion and Analysis of Financial Condition and Results of Operations, contained in our annual report on Form 10-K for the year ending December 31, 2023.

Prior Year Discussion of Results and Comparisons

For Information on fiscal second quarter 2023 results and similar comparisons, see “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Form 10-Q for the fiscal three and six-month periods ended June 30, 2023.

Information Regarding Non-GAAP Measures and Other

In the discussion and analysis of our results of operations that follows, in addition to reporting financial results in accordance with GAAP, we provide information regarding EBITDAC, EBITDAC margin, adjusted EBITDAC, adjusted EBITDAC margin, diluted net earnings per share, as adjusted (adjusted EPS), adjusted revenue, adjusted compensation and operating expenses, adjusted compensation expense ratio, adjusted operating expense ratio and organic revenue. These measures are not in accordance with, or an alternative to, the GAAP information provided in this quarterly report on Form 10‑Q. We believe that these presentations provide useful information to management, analysts and investors regarding financial and business trends relating to our results of operations and financial condition or because they provide investors with measures that our chief operating decision makers use when reviewing the company’s performance. See further below for definitions and additional reasons each of these measures is useful to investors. Our industry peers may provide similar supplemental non-GAAP information with respect to one or more of these measures, although they may not use the same or comparable terminology and may not make identical adjustments. The non-GAAP information we provide should be used in addition to, but not as a substitute for, the GAAP information provided. As disclosed in our most recent Proxy Statement, we make determinations regarding certain elements of executive officer incentive compensation, performance share awards and annual cash incentive awards, partly on the basis of measures related to adjusted EBITDAC.

Adjusted Non-GAAP presentation - We believe that the adjusted non-GAAP presentation of the current and prior period information presented on the following pages provides stockholders and other interested persons with useful information regarding certain financial metrics that may assist such persons in analyzing our operating results as they develop a future earnings outlook for us. The after-tax amounts related to the adjustments were computed using the normalized effective tax rate for each respective period.

•Adjusted measures - We define these measures as revenues (for the brokerage segment), revenues before reimbursements (for the risk management segment), net earnings, compensation expense and operating expense, respectively, each adjusted to exclude the following, as applicable:

•Net gains (losses) on divestitures, which are primarily net proceeds received related to sales of books of business and other divestiture transactions, such as the disposal of a business through sale or closure.

•Acquisition integration costs, which include costs related to certain large acquisitions (including the acquisitions of Willis Re, Buck, Cadence Insurance, Eastern Insurance and My Plan Manager), outside the scope of our usual tuck‑in strategy, not expected to occur on an ongoing basis in the future once we fully assimilate the applicable acquisition. These costs are typically associated with redundant workforce, compensation expense related to amortization of certain retention bonus arrangements, extra lease space, duplicate services and external costs incurred to assimilate the acquisition into our IT related systems.

•Transaction-related costs, which are primarily associated with the acquisition of Willis Re, Buck, Cadence Insurance, Eastern Insurance and My Plan Manager. These include costs related to regulatory filings, legal and accounting services, insurance and incentive compensation.

•Workforce related charges, which primarily include severance costs (either accrued or paid) related to employee terminations and other costs associated with redundant workforce.

•Lease termination related charges, which primarily include costs related to terminations of real estate leases and abandonment of leased space.

•Acquisition related adjustments principally relate to changes in estimated acquisition earnout payables adjustments and acquisition related compensation charges. In addition, from time to time may include changes in balance sheet estimates arising from conforming accounting principles, purchase-related true-ups and other balance sheet adjustments made after the closing date; the net impact on the results for first quarter 2024 was approximately $26 million of revenues and approximately $28 million of compensation expense. There were no changes to these

- 35 -

amounts in second quarter 2024.

•Amortization of intangible assets, which reflects the amortization of customer/expiration lists, non-compete agreements, trade names and other intangible assets acquired through our merger and acquisition strategy, the impact to amortization expense of acquisition valuation adjustments to these assets as well as non-cash impairment charges.

•The impact of foreign currency translation, as applicable. The amounts excluded with respect to foreign currency translation are calculated by applying current year foreign exchange rates to the same period in the prior year.

•Effective income tax rate impact, which levelizes the prior year for the change in current year tax rates.

•Legal and tax related, which represents the impact of adjustments in second quarter 2023 related to additional U.K. income tax expense related to the non-deductibility of acquisition-related adjustments made in the quarter and costs associated with legal and tax matters.

•Adjusted ratios - Adjusted compensation expense and adjusted operating expense, respectively, each divided by adjusted revenues.

Non-GAAP Earnings Measures

We believe that the presentation of EBITDAC, EBITDAC margin, adjusted EBITDAC, adjusted EBITDAC margin, adjusted EPS and adjusted net earnings for the brokerage and risk management segments, each as defined below, provides a meaningful representation of our operating performance. Adjusted EPS is a performance measure and should not be used as a measure of our liquidity. We also consider EBITDAC and EBITDAC margin as ways to measure financial performance on an ongoing basis. In addition, adjusted EBITDAC, adjusted EBITDAC margin and adjusted EPS for the brokerage and risk management segments are presented to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability.

•EBITDAC and EBITDAC Margin - EBITDAC is net earnings before interest, income taxes, depreciation, amortization and the change in estimated acquisition earnout payables and EBITDAC margin is EBITDAC divided by total revenues (for the brokerage segment) and revenues before reimbursements (for the risk management segment). These measures for the brokerage and risk management segments provide a meaningful representation of our operating performance for the overall business and provide a meaningful way to measure its financial performance on an ongoing basis.

•EBITDAC, as adjusted and EBITDAC Margin, as adjusted - Adjusted EBITDAC is EBITDAC adjusted to exclude net gains (losses) on divestitures, acquisition integration costs, workforce related charges, lease termination related charges, acquisition related adjustments, transaction related costs, legal and tax related costs and the period-over-period impact of foreign currency translation as applicable, and Adjusted EBITDAC margin is Adjusted EBITDAC divided by total adjusted revenues (defined above). These measures for the brokerage and risk management segments provide a meaningful representation of our operating performance, and are also presented to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability.

•EPS, as adjusted and Net Earnings, as adjusted - Adjusted net earnings have been adjusted to exclude the after-tax impact of net gains (losses) on divestitures, acquisition integration costs, the impact of foreign currency translation, workforce related charges, lease termination related charges, acquisition related adjustments, transaction related costs, amortization of intangible assets, legal and tax related costs and effective income tax rate impact, as applicable. Adjusted EPS is Adjusted Net Earnings divided by diluted weighted average shares outstanding. This measure provides a meaningful representation of our operating performance (and as such should not be used as a measure of our liquidity), and for the overall business is also presented to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability.

Organic Revenues (a non-GAAP measure) - For the brokerage segment, organic change in base commission and fee revenues, supplemental revenues and contingent revenues exclude the first twelve months of such revenues generated from acquisitions and such revenues related to divested operations, which include disposals of a business through sale or closure, run-off of a business and the restructuring and/or repricing of programs and products in each year presented. These revenues are excluded from organic revenues in order to help interested persons analyze the revenue growth associated with the operations that were a part of our business in both the current and prior period. In addition, organic change in base commission and fee revenues, supplemental revenues and contingent revenues excludes the period‑over‑period impact of foreign currency translation to improve the comparability of our results between periods. For the risk management segment, organic change in fee revenues excludes the first twelve months of such revenues generated from acquisitions and such revenues related to divested operations in each year presented. In addition, change in organic growth in fee revenues excludes the period-over-period impact of foreign currency translation to improve the comparability of our results between periods.

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These revenue items are excluded from organic revenues in order to determine a comparable, but non-GAAP, measurement of revenue growth that is associated with the revenue sources that are expected to continue in the current year and beyond, as well as eliminating the impact of the items that have a high degree of variability. We have historically viewed organic revenue growth as an important indicator when assessing and evaluating the performance of our brokerage and risk management segments. We also believe that using this non‑GAAP measure allows readers of our financial statements to measure, analyze and compare the growth from our brokerage and risk management segments in a meaningful and consistent manner.

Reconciliation of Non-GAAP Information Presented to GAAP Measures - This quarterly report on Form 10‑Q includes tabular reconciliations to the most comparable GAAP measures, as follows: for EBITDAC (on pages 45 and 51), for adjusted revenues, adjusted EBITDAC and adjusted diluted net earnings per share (on pages 39 and 40), for organic revenue measures (on pages 46 and 51), respectively, for the brokerage and risk management segments, for adjusted compensation and operating expenses and adjusted EBITDAC margin, (on pages 48 and 49) for the brokerage segment and (on pages 52 and 53) for the risk management segment.

Other Information - Allocations of investment income and certain expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. We allocate the provision for income taxes to the brokerage and risk management segments using local statutory rates. We anticipate reporting an effective tax rate of approximately 24.5% to 26.5% in the brokerage segment and 25.0% to 27.0% in the risk management segment for the foreseeable future. Reported operating results by segment would change if different allocation methods were applied.

In the discussion that follows regarding our results of operations, we also provide the following ratios with respect to our operating results: pretax profit margin, compensation expense ratio and operating expense ratio. Pretax profit margin represents pretax earnings divided by total revenues. The compensation expense ratio is compensation expense divided by total revenues. The operating expense ratio is operating expense divided by total revenues.

Overview and Second Quarter 2024 Highlights

We are engaged in providing insurance brokerage, reinsurance brokerage, consulting services, and third-party property/casualty claims settlement and administration services to entities and individuals around the world. In the six-month period ended June 30, 2024, we generated approximately 64% of our revenues for the combined brokerage and risk management segments domestically and 36% internationally, primarily in Australia, Canada, New Zealand and the U.K. We have three reportable segments: brokerage, risk management and corporate. The brokerage and risk management segments contributed approximately 87% and 13%, respectively, to revenues during the six-month period ended June 30, 2024. The corporate segment did not generate any significant revenues in the six-month period ended June 30, 2024. Our major sources of operating revenues are commissions, fees and supplemental and contingent revenues from brokerage operations and fees from risk management operations. Interest income is earned on cash, cash equivalents and fiduciary cash and revenues are generated from premium financing.

We use the Council of Insurance Agents and Brokers (which we refer to as CIAB) insurance pricing quarterly survey as an indicator of the insurance rate environment. The CIAB represents the leading domestic and international insurance brokers, who write approximately 85% of the commercial property/casualty premiums in the U.S. The second quarter 2024 survey had not been published as of the filing date of this report. The first quarter 2024 survey indicated that commercial property/casualty rates increased by 7.7% on average and we expect a similar trend to be noted when the CIAB's second quarter 2024 survey report is issued, which would indicate overall continued price firming and hardening in most lines of business.

We believe increases in property/casualty rates will continue for the remainder of 2024 due to rising loss costs, a firm reinsurance market, increased frequency of catastrophe losses, prior year reserve volatility and social inflation. If loss trends deteriorate over the coming quarters, including due to the impact of natural catastrophes, or if profitability concerns on casualty lines increase, it could lead to a more difficult rate and conditions environment in certain lines. The combination of increasing insurable values (due to inflation, including wage inflation), a tight labor market and low unemployment is likely contributing to increases in client insured exposures. Additionally, we expect that our history of strong new business generation, solid retentions and enhanced value‑added services for our carrier partners should all result in further organic growth opportunities around the world. Overall, we believe that in a positive rate environment with increasing exposures, our professionals can demonstrate their expertise and high‑quality, value-added capabilities by strengthening our clients’ insurance portfolios and delivering insurance and risk management solutions within our clients’ budgets. Based on our experience, insurance and reinsurance carriers appear to be making rational pricing decisions and are providing adequate capacity in the market for nearly all lines of coverage.

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Summary of Financial Results - Three-Month Periods Ended June 30, 2024 and 2023

See the reconciliations of non-GAAP measures on page 41.

(In millions, except per share data)	2nd Quarter 2024						2nd Quarter 2023						Change
	Reported			Adjusted			Reported			Adjusted			Reported			Adjusted
	GAAP			Non-GAAP			GAAP			Non-GAAP			GAAP			Non-GAAP
Brokerage Segment
Revenues	$	2,376.3		$	2,374.3		$	2,088.4		$	2,075.2			14	%		14	%
Organic revenues				$	2,145.9					$	1,993.4						7.7	%
Net earnings	$	332.8					$	290.3						15	%
Net earnings margin		14.0	%					13.9	%				+ 10 bpts
Adjusted EBITDAC				$	784.8					$	665.7						18	%
Adjusted EBITDAC margin					33.1	%					32.1	%				+ 97 bpts
Diluted net earnings per share	$	1.48		$	2.46		$	1.31		$	2.09			13	%		18	%
Risk Management Segment
Revenues before reimbursements	$	358.6		$	358.5		$	318.6		$	317.8			13	%		13	%
Organic revenues				$	335.1					$	311.3						7.7	%
Net earnings	$	47.8					$	36.7						30	%
Net earnings margin (before reimbursements)		13.3	%					11.5	%				+ 181 bpts
Adjusted EBITDAC				$	73.9					$	61.6						20	%
Adjusted EBITDAC margin (before reimbursements)					20.6	%					19.4	%				+ 123 bpts
Diluted net earnings per share	$	0.21		$	0.22		$	0.17		$	0.18			24	%		22	%
Corporate Segment
Diluted net loss per share	$	(0.43	)	$	(0.42	)	$	(0.41	)	$	(0.38	)
Total Company
Diluted net earnings per share	$	1.26		$	2.26		$	1.07		$	1.89			18	%		20	%
Total Brokerage and Risk Management Segment
Diluted net earnings per share	$	1.69		$	2.68		$	1.48		$	2.27			14	%		18	%

Summary of Financial Results - Six-Month Periods Ended June 30, 2024 and 2023

See the reconciliations of non-GAAP measures on page 42.

(In millions, except per share data)	Six-Months 2024						Six-Months 2023						Change
	Reported			Adjusted			Reported			Adjusted			Reported			Adjusted
	GAAP			Non-GAAP			GAAP			Non-GAAP			GAAP			Non-GAAP
Brokerage Segment
Revenues	$	5,241.2		$	5,212.7		$	4,463.6		$	4,455.4			17	%		17	%
Organic revenues				$	4,672.4					$	4,313.5						8.3	%
Net earnings	$	985.4					$	805.6						22	%
Net earnings margin		18.8	%					18.0	%				+ 75 bpts
Adjusted EBITDAC				$	1,917.1					$	1,623.2						18	%
Adjusted EBITDAC margin					36.8	%					36.4	%				+ 35 bpts
Diluted net earnings per share	$	4.40		$	6.07		$	3.68		$	5.20			20	%		17	%
Risk Management Segment
Revenues before reimbursements	$	711.4		$	711.5		$	616.2		$	614.2			15	%		16	%
Organic revenues				$	665.9					$	603.2						10.4	%
Net earnings	$	87.1					$	70.2						24	%
Net earnings margin (before reimbursements)		12.2	%					11.4	%				+ 85 bpts
Adjusted EBITDAC				$	146.6					$	118.5						24	%
Adjusted EBITDAC margin (before reimbursements)					20.6	%					19.3	%				+ 131 bpts
Diluted net earnings per share	$	0.39		$	0.42		$	0.32		$	0.34			22	%		24	%
Corporate Segment
Diluted net loss per share	$	(0.78	)	$	(0.76	)	$	(0.69	)	$	(0.64	)
Total Company
Diluted net earnings per share	$	4.01		$	5.73		$	3.31		$	4.90			21	%		17	%
Total Brokerage and Risk Management Segment
Diluted net earnings per share	$	4.79		$	6.49		$	4.00		$	5.54			20	%		17	%

The following provides information that management believes is helpful when comparing revenues before reimbursements, net earnings, EBITDAC and diluted net earnings per share for the three and six-month periods ended June 30, 2024 with the same periods in 2023. In addition, these tables provide reconciliations to the most comparable GAAP measures for adjusted revenues, adjusted

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EBITDAC and adjusted diluted net earnings per share. Reconciliations of EBITDAC for the brokerage and risk management segments are provided on pages 45 and 51, respectively, of this filing.

For the Three-Month Periods Ended June 30 Reported GAAP to Adjusted Non-GAAP Reconciliation:

	Revenues Before																		Diluted Net Earnings
	Reimbursements						Net Earnings (Loss)						EBITDAC						(Loss) Per Share
Segment	2024			2023			2024			2023			2024			2023			2024			2023			Chg
	(in millions)						(in millions)						(in millions)
Brokerage, as reported	$	2,376.3		$	2,088.4		$	332.8		$	290.3		$	668.1		$	563.8		$	1.48		$	1.31			13	%
Net (gains) on divestitures		(2.0	)		(5.0	)		(1.5	)		(3.8	)		(2.0	)		(5.0	)		(0.01	)		(0.02	)
Acquisition integration		—			—			40.0			51.2			53.6			68.1			0.18			0.24
Workforce and lease termination		—			—			20.8			23.7			27.9			31.6			0.10			0.11
Acquisition related adjustments		—			—			30.8			0.7			37.2			10.8			0.14			—
Amortization of intangible assets		—			—			127.5			100.2			—			—			0.57			0.46
Effective income tax rate impact		—			—			—			(0.2	)		—			—			—			—
Levelized foreign currency    translation		—			(8.2	)		—			(2.9	)		—			(3.6	)		—			(0.01	)
Brokerage, as adjusted *		2,374.3			2,075.2			550.4			459.2			784.8			665.7			2.46			2.09			18	%
Risk Management, as reported		358.6			318.6			47.8			36.7			72.3			60.5			0.21			0.17			24	%
Net (gains) on divestitures		(0.1	)		(0.1	)		(0.1	)		(0.1	)		(0.1	)		(0.1	)		—			—
Acquisition integration		—			—			0.2			0.1			0.2			0.2			—			—
Workforce and lease termination		—			—			1.1			0.7			1.4			1.0			0.01			—
Acquisition related adjustments		—			—			0.1			0.1			0.1			0.1			—			—
Amortization of intangible assets		—			—			—			1.0			—			—			—			0.01
Levelized foreign currency    translation		—			(0.7	)		—			(0.1	)		—			(0.1	)		—			—
Risk Management, as adjusted *		358.5			317.8			49.1			38.4			73.9			61.6			0.22			0.18			22	%
Corporate, as reported		1.1			(0.1	)		(95.2	)		(91.2	)		(50.1	)		(64.0	)		(0.43	)		(0.41	)
Transaction-related costs		—			—			2.3			2.4			2.8			3.2			0.01			0.01
Legal and tax related		—			—			—			5.0			—			5.5			—			0.02
Corporate, as adjusted*		1.1			(0.1	)		(92.9	)		(83.8	)		(47.3	)		(55.3	)		(0.42	)		(0.38	)
Total Company, as reported	$	2,736.0		$	2,406.9		$	285.4		$	235.8		$	690.3		$	560.3		$	1.26		$	1.07			18	%
Total Company, as adjusted *	$	2,733.9		$	2,392.9		$	506.6		$	413.8		$	811.4		$	672.0		$	2.26		$	1.89			20	%
Total Brokerage & Risk
Management, as reported	$	2,734.9		$	2,407.0		$	380.6		$	327.0		$	740.4		$	624.3		$	1.69		$	1.48			14	%
Total Brokerage & Risk
Management, as adjusted *	$	2,732.8		$	2,393.0		$	599.5		$	497.6		$	858.7		$	727.3		$	2.68		$	2.27			18	%

*For the three-month period ended June 30, 2024, the pretax impact of the brokerage segment adjustments totals $291.3 million, mostly due to non-cash period expenses related to intangible amortization, with a corresponding adjustment to the provision for income taxes of $73.7 million relating to these items. For the three-month period ended June 30, 2024, the pretax impact of the risk management segment adjustments totals $1.6 million, with a corresponding adjustment to the provision for income taxes of $0.3 million relating to these items. For the three-month period ended June 30, 2024, the pretax impact of the corporate segment adjustments totals $2.8 million, with a corresponding adjustment to the benefit for income taxes of $0.5 million. A detailed reconciliation of the 2024 provision (benefit) for income taxes is shown on page 41.

*For the three-month period ended June 30, 2023, the pretax impact of the brokerage segment adjustments totals $225.2 million, with a corresponding adjustment to the provision for income taxes of $56.3 million relating to these items. For the three-month period ended June 30, 2023, the pretax impact of the risk management segment adjustments totals $2.6 million, with a corresponding adjustment to the provision for income taxes of $0.9 million relating to these items. For the three-month period ended June 30, 2023, the pretax impact of the corporate segment adjustments totals $8.7 million, with a corresponding adjustment to the benefit for income taxes of $1.3 million. A detailed reconciliation of the 2023 provision (benefit) for income taxes is shown on page 41.

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For the Six-Month Periods Ended June 30 Reported GAAP to Adjusted Non-GAAP Reconciliation:

	Revenues Before																		Diluted Net Earnings
	Reimbursements						Net Earnings (Loss)						EBITDAC						(Loss) Per Share
Segment	2024			2023			2024			2023			2024			2023			2024			2023			Chg
	(in millions)						(in millions)						(in millions)
Brokerage, as reported	$	5,241.2		$	4,463.6		$	985.4		$	805.6		$	1,716.8		$	1,444.4		$	4.40		$	3.68			20	%
Net (gains) on divestitures		(2.5	)		(5.2	)		(1.9	)		(4.0	)		(2.5	)		(5.2	)		(0.01	)		(0.02	)
Acquisition integration		—			—			76.4			90.9			102.3			119.3			0.35			0.42
Workforce and lease termination		—			—			29.5			35.5			39.5			47.0			0.13			0.16
Acquisition related adjustments		(26.0	)		—			22.5			26.3			61.0			22.2			0.10			0.12
Amortization of intangible assets		—			—			244.2			189.3			—			—			1.10			0.87
Effective income tax rate impact		—			—			—			(2.9	)		—			—			—			(0.01	)
Levelized foreign currency    translation		—			(3.0	)		—			(3.8	)		—			(4.5	)		—			(0.02	)
Brokerage, as adjusted *		5,212.7			4,455.4			1,356.1			1,136.9			1,917.1			1,623.2			6.07			5.20			17	%
Risk Management, as reported		711.4			616.2			87.1			70.2			142.8			116.4			0.39			0.32			22	%
Net losses (gains) on divestitures		0.1			(0.2	)		—			(0.2	)		0.1			(0.2	)		—			—
Acquisition integration		—			—			0.7			0.5			0.9			0.8			—			—
Workforce and lease termination		—			—			2.0			1.2			2.6			1.6			0.01			0.01
Acquisition related adjustments		—			—			0.2			0.2			0.2			0.2			—			—
Amortization of intangible assets		—			—			4.5			2.1			—			—			0.02			0.01
Levelized foreign currency    translation		—			(1.8	)		—			(0.2	)		—			(0.3	)		—			—
Risk Management, as adjusted *		711.5			614.2			94.5			73.8			146.6			118.5			0.42			0.34			24	%
Corporate, as reported		1.5			—			(174.4	)		(153.4	)		(112.8	)		(125.6	)		(0.78	)		(0.69	)
Transaction-related costs		—			—			5.0			5.7			6.0			7.6			0.02			0.03
Legal and tax related		—			—			—			5.0			—			5.5			—			0.02
Corporate, as adjusted*		1.5			—			(169.4	)		(142.7	)		(106.8	)		(112.5	)		(0.76	)		(0.64	)
Total Company, as reported	$	5,954.1		$	5,079.8		$	898.1		$	722.4		$	1,746.8		$	1,435.2		$	4.01		$	3.31			21	%
Total Company, as adjusted *	$	5,925.7		$	5,069.6		$	1,281.2		$	1,068.0		$	1,956.9		$	1,629.2		$	5.73		$	4.90			17	%
Total Brokerage & Risk
Management, as reported	$	5,952.6		$	5,079.8		$	1,072.5		$	875.8		$	1,859.6		$	1,560.8		$	4.79		$	4.00			20	%
Total Brokerage & Risk
Management, as adjusted *	$	5,924.2		$	5,069.6		$	1,450.6		$	1,210.7		$	2,063.7		$	1,741.7		$	6.49		$	5.54			17	%

*For the six-month period ended June 30, 2024, the pretax impact of the brokerage segment adjustments totals $496.0 million, mostly due to non-cash period expenses related to intangible amortization, with a corresponding adjustment to the provision for income taxes of $125.3 million relating to these items. For the six-month period ended June 30, 2024, the pretax impact of the risk management segment adjustments totals $10.1 million, with a corresponding adjustment to the provision for income taxes of $2.7 million relating to these items. For the six-month period ended June 30, 2024, the pretax impact of the corporate segment adjustments totals $6.0 million, with a corresponding adjustment to the benefit for income taxes of $1.0 million. A detailed reconciliation of the 2024 provision (benefit) for income taxes is shown on page 42.

*For the six-month period ended June 30, 2023 the pretax impact of the brokerage segment adjustments totals $444.2 million, with a corresponding adjustment to the provision for income taxes of $112.9 million relating to these items. For the six-month period ended June 30, 2023, the pretax impact of the risk management segment adjustments totals $5.2 million, with a corresponding adjustment to the provision for income taxes of $1.6 million relating to these items. For the six-month period ended June 30, 2023, the pretax impact of the corporate segment adjustments totals $13.1 million, with a corresponding adjustment to the benefit for income taxes of $2.4 million. A detailed reconciliation of the 2023 provision (benefit) for income taxes is shown on page 42.

- 40 -

Reconciliation of Non-GAAP Measures - Pre-tax Earnings and Diluted Net Earnings per Share

(In millions except share and per share data)
	Earnings			Provision						Net Earnings (Loss)			Net Earnings (Loss)
	(Loss)			(Benefit)						Attributable to			Attributable to			Diluted Net
	Before Income			for Income			Net Earnings			Noncontrolling			Controlling			Earnings (Loss)
	Taxes			Taxes			(Loss)			Interests			Interests			per Share
Quarter Ended June 30, 2024
Brokerage, as reported	$	446.3		$	113.5		$	332.8		$	2.0		$	330.8		$	1.48
Net (gains) on divestitures		(2.0	)		(0.5	)		(1.5	)		—			(1.5	)		(0.01	)
Acquisition integration		53.6			13.6			40.0			—			40.0			0.18
Workforce and lease termination		27.9			7.1			20.8			—			20.8			0.10
Acquisition related adjustments		41.0			10.2			30.8			—			30.8			0.14
Amortization of intangible assets		170.8			43.3			127.5			—			127.5			0.57
Brokerage, as adjusted	$	737.6		$	187.2		$	550.4		$	2.0		$	548.4		$	2.46
Risk Management, as reported	$	65.4		$	17.6		$	47.8		$	—		$	47.8		$	0.21
Net (gains) on divestitures		(0.1	)		—			(0.1	)		—			(0.1	)		—
Acquisition integration		0.2			—			0.2			—			0.2			—
Workforce and lease termination		1.4			0.3			1.1			—			1.1			0.01
Acquisition related adjustments		0.1			—			0.1			—			0.1			—
Amortization of intangible assets		—			—			—			—			—			—
Risk Management, as adjusted	$	67.0		$	17.9		$	49.1		$	—		$	49.1		$	0.22
Corporate, as reported	$	(146.1	)	$	(50.9	)	$	(95.2	)	$	—		$	(95.2	)	$	(0.43	)
Transaction-related costs		2.8			0.5			2.3			—			2.3			0.01
Corporate, as adjusted	$	(143.3	)	$	(50.4	)	$	(92.9	)	$	—		$	(92.9	)	$	(0.42	)
Quarter Ended June 30, 2023
Brokerage, as reported	$	390.5		$	100.2		$	290.3		$	2.0		$	288.3		$	1.31
Net (gains) on divestitures		(5.0	)		(1.2	)		(3.8	)		—			(3.8	)		(0.02	)
Acquisition integration		68.1			16.9			51.2			—			51.2			0.24
Workforce and lease termination		31.6			7.9			23.7			—			23.7			0.11
Acquisition related adjustments		0.9			0.2			0.7			—			0.7			—
Amortization of intangible assets		133.4			33.2			100.2			—			100.2			0.46
Effective income tax rate impact		—			0.2			(0.2	)		—			(0.2	)		—
Levelized foreign currency translation		(3.8	)		(0.9	)		(2.9	)		—			(2.9	)		(0.01	)
Brokerage, as adjusted	$	615.7		$	156.5		$	459.2		$	2.0		$	457.2		$	2.09
Risk Management, as reported	$	49.9		$	13.2		$	36.7		$	—		$	36.7		$	0.17
Net (gains) on divestitures		(0.1	)		—			(0.1	)		—			(0.1	)		—
Acquisition integration		0.2			0.1			0.1			—			0.1			—
Workforce and lease termination		1.0			0.3			0.7			—			0.7			—
Acquisition related adjustments		0.1			—			0.1			—			0.1			—
Amortization of intangible assets		1.5			0.5			1.0			—			1.0			0.01
Levelized foreign currency translation		(0.1	)		—			(0.1	)		—			(0.1	)		—
Risk Management, as adjusted	$	52.5		$	14.1		$	38.4		$	—		$	38.4		$	0.18
Corporate, as reported	$	(143.0	)	$	(51.8	)	$	(91.2	)	$	(0.7	)	$	(90.5	)	$	(0.41	)
Transaction-related costs		3.2			0.8			2.4			—			2.4			0.01
Income tax related		5.5			0.5			5.0			—			5.0			0.02
Corporate, as adjusted	$	(134.3	)	$	(50.5	)	$	(83.8	)	$	(0.7	)	$	(83.1	)	$	(0.38	)

- 41 -

Reconciliation of Non-GAAP Measures - Pre-tax Earnings and Diluted Net Earnings per Share

(In millions except share and per share data)
	Earnings			Provision						Net Earnings (Loss)			Net Earnings (Loss)
	(Loss)			(Benefit)						Attributable to			Attributable to			Diluted Net
	Before Income			for Income			Net Earnings			Noncontrolling			Controlling			Earnings (Loss)
	Taxes			Taxes			(Loss)			Interests			Interests			per Share
Six-Months Ended June 30, 2024
Brokerage, as reported	$	1,322.4		$	337.0		$	985.4		$	6.3		$	979.1		$	4.40
Net (gains) on divestitures		(2.5	)		(0.6	)		(1.9	)		—			(1.9	)		(0.01	)
Acquisition integration		102.3			25.9			76.4			—			76.4			0.35
Workforce and lease termination		39.5			10.0			29.5			—			29.5			0.13
Acquisition related adjustments		29.9			7.4			22.5			(3.0	)		25.5			0.10
Amortization of intangible assets		326.8			82.6			244.2			—			244.2			1.10
Brokerage, as adjusted	$	1,818.4		$	462.3		$	1,356.1		$	3.3		$	1,352.8		$	6.07
Risk Management, as reported	$	118.6		$	31.5		$	87.1		$	—		$	87.1		$	0.39
Net losses on divestitures		0.1			0.1			—			—			—			—
Acquisition integration		0.9			0.2			0.7			—			0.7			—
Workforce and lease termination		2.6			0.6			2.0			—			2.0			0.01
Acquisition related adjustments		0.2			—			0.2			—			0.2			—
Amortization of intangible assets		6.3			1.8			4.5			—			4.5			0.02
Risk Management, as adjusted	$	128.7		$	34.2		$	94.5		$	—		$	94.5		$	0.42
Corporate, as reported	$	(302.7	)	$	(128.3	)	$	(174.4	)	$	—		$	(174.4	)	$	(0.78	)
Transaction-related costs		6.0			1.0			5.0			—			5.0			0.02
Corporate, as adjusted	$	(296.7	)	$	(127.3	)	$	(169.4	)	$	—		$	(169.4	)	$	(0.76	)
Six-Months Ended June 30, 2023
Brokerage, as reported	$	1,081.4		$	275.8		$	805.6		$	2.8		$	802.8		$	3.68
Net (gains) on divestitures		(5.2	)		(1.2	)		(4.0	)		—			(4.0	)		(0.02	)
Acquisition integration		119.3			28.4			90.9			—			90.9			0.42
Workforce and lease termination		47.1			11.6			35.5			—			35.5			0.16
Acquisition related adjustments		34.3			8.0			26.3			—			26.3			0.12
Amortization of intangible assets		253.6			64.3			189.3			—			189.3			0.87
Effective income tax rate impact		—			2.9			(2.9	)		—			(2.9	)		(0.01	)
Levelized foreign currency translation		(4.9	)		(1.1	)		(3.8	)		—			(3.8	)		(0.02	)
Brokerage, as adjusted	$	1,525.6		$	388.7		$	1,136.9		$	2.8		$	1,134.1		$	5.20
Risk Management, as reported	$	95.4		$	25.2		$	70.2		$	—		$	70.2		$	0.32
Net (gains) on divestitures		(0.2	)		—			(0.2	)		—			(0.2	)		—
Workforce and lease termination		1.6			0.4			1.2			—			1.2			0.01
Acquisition related adjustments		0.2			—			0.2			—			0.2			—
Acquisition integration		0.8			0.3			0.5			—			0.5			—
Amortization of intangible assets		3.0			0.9			2.1			—			2.1			0.01
Levelized foreign currency translation		(0.2	)		—			(0.2	)		—			(0.2	)		—
Risk Management, as adjusted	$	100.6		$	26.8		$	73.8		$	—		$	73.8		$	0.34
Corporate, as reported	$	(273.6	)	$	(120.2	)	$	(153.4	)	$	(1.4	)	$	(152.0	)	$	(0.69	)
Transaction-related costs		7.6			1.9			5.7			—			5.7			0.03
Income tax related		5.5			0.5			5.0			—			5.0			0.02
Corporate, as adjusted	$	(260.5	)	$	(117.8	)	$	(142.7	)	$	(1.4	)	$	(141.3	)	$	(0.64	)

- 42 -

Results of Operations

Brokerage

The brokerage segment accounted for 87% of our revenues during the six-month period ended June 30, 2024. Our brokerage segment is primarily comprised of retail, wholesale and reinsurance brokerage operations. Our brokerage segment generates revenues by:

(i)Identifying, negotiating and placing all forms of insurance coverage, as well as providing data analytics, risk-shifting, risk-sharing and risk-mitigation consulting services, principally related to property/casualty, life, health, welfare and disability insurance. We also provide these services through, or in conjunction with, other unrelated agents and brokers, consultants and management advisors;

(ii)Identifying, negotiating and placing all forms of reinsurance coverage, as well as providing capital markets services, including acting as underwriter, with respect to insurance linked securities, weather derivatives, capital raising and selected merger and acquisition advisory activities;

(iii)Acting as an agent or broker for multiple underwriting enterprises by providing services such as sales, marketing, selecting, negotiating, underwriting, servicing and placing insurance coverage on their behalf;

(iv)Providing consulting services related to health and welfare benefits, voluntary benefits, executive benefits, compensation, retirement planning, institutional investment and fiduciary, actuarial, compliance, private insurance exchange, human resources technology, communications and benefits administration; and

(v)Providing management and administrative services to captives, pools, risk-retention groups, healthcare exchanges, small underwriting enterprises, such as accounting, claims and loss processing assistance, feasibility studies, actuarial studies, data analytics and other administrative services.

The primary source of revenues for our brokerage services is commissions from underwriting enterprises, based on a percentage of premiums paid by our clients, or fees received from clients based on an agreed level of service usually in lieu of commissions. Commissions are fixed at the contract effective date and generally are based on a percentage of premiums for insurance coverage or employee headcount for employer sponsored benefit plans. Commissions depend upon a large number of factors, including the type of risk being placed, the particular underwriting enterprise’s demand, the expected loss experience of the particular risk of coverage, and historical benchmarks surrounding the level of effort necessary for us to place and service the insurance contract. Rather than being tied to the amount of premiums, fees are most often based on an expected level of effort to provide our services. In addition, under certain circumstances, both retail brokerage and wholesale brokerage services receive supplemental and contingent revenues. Supplemental revenue is revenue paid by an underwriting enterprise that is above the base commission paid, is determined by the underwriting enterprise and is established annually in advance of the contractual period based on historical performance criteria. Contingent revenue is revenue paid by an underwriting enterprise based on the overall profit and/or volume of the business placed with that underwriting enterprise during a particular calendar year and is determined after the contractual period.

Litigation, Regulatory and Taxation Matters

As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services business has been under audit by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promoter in connection with these operations. Additionally, the IRS is conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not a target of the criminal investigation. We are fully cooperating with both matters.

- 43 -

Financial information relating to our brokerage segment results for the three and six-month periods ended June 30, 2024 compared to the same periods in 2023, is as follows (in millions, except per share, percentages and workforce data):

	Three-month period ended June 30,									Six-month period ended June 30,
Statement of Earnings	2024			2023			Change			2024			2023			Change
Commissions	$	1,661.8		$	1,410.4		$	251.4		$	3,655.4		$	3,157.8		$	497.6
Fees		477.6			478.5			(0.9	)		1,084.3			891.2			193.1
Supplemental revenues		88.7			71.2			17.5			182.6			152.8			29.8
Contingent revenues		59.8			54.2			5.6			145.8			126.0			19.8
Interest income, premium finance revenues and other income		88.4			74.1			14.3			173.1			135.8			37.3
Total revenues		2,376.3			2,088.4			287.9			5,241.2			4,463.6			777.6
Compensation		1,370.3			1,196.4			173.9			2,847.1			2,402.5			444.6
Operating		337.9			328.2			9.7			677.3			616.7			60.6
Depreciation		32.3			30.6			1.7			65.1			58.5			6.6
Amortization		170.8			133.4			37.4			326.8			253.6			73.2
Change in estimated acquisition    earnout payables		18.7			9.3			9.4			2.5			50.9			(48.4	)
Total expenses		1,930.0			1,697.9			232.1			3,918.8			3,382.2			536.6
Earnings before income taxes		446.3			390.5			55.8			1,322.4			1,081.4			241.0
Provision for income taxes		113.5			100.2			13.3			337.0			275.8			61.2
Net earnings		332.8			290.3			42.5			985.4			805.6			179.8
Net earnings attributable to    noncontrolling interests		2.0			2.0			—			6.3			2.8			3.5
Net earnings attributable to    controlling interests	$	330.8		$	288.3		$	42.5		$	979.1		$	802.8		$	176.3
Diluted net earnings per share	$	1.48		$	1.31		$	0.17		$	4.40		$	3.68		$	0.72
Other Information
Change in diluted net earnings    per share		13	%		-10	%					20	%		2	%
Growth in revenues		14	%		20	%					17	%		16	%
Organic change in commissions and    fees		8	%		10	%					8	%		10	%
Compensation expense ratio		58	%		57	%					54	%		54	%
Operating expense ratio		14	%		16	%					13	%		14	%
Effective income tax rate		25	%		26	%					25	%		26	%
Workforce at end of period (includes    acquisitions)											40,566			36,609
Identifiable assets at June 30										$	58,776.7		$	50,623.8
EBITDAC
Net earnings	$	332.8		$	290.3		$	42.5		$	985.4		$	805.6		$	179.8
Provision for income taxes		113.5			100.2			13.3			337.0			275.8			61.2
Depreciation		32.3			30.6			1.7			65.1			58.5			6.6
Amortization		170.8			133.4			37.4			326.8			253.6			73.2
Change in estimated acquisition    earnout payables		18.7			9.3			9.4			2.5			50.9			(48.4	)
EBITDAC	$	668.1		$	563.8		$	104.3		$	1,716.8		$	1,444.4		$	272.4

- 44 -

The following provides information that management believes is helpful when comparing EBITDAC and adjusted EBITDAC for the three and six-month periods ended June 30, 2024 compared to the same periods in 2023 (in millions):

	Three-month period ended June 30,									Six-month period ended June 30,
	2024			2023			Change			2024			2023			Change
Net earnings, as reported	$	332.8		$	290.3			15	%	$	985.4		$	805.6			22	%
Provision for income taxes		113.5			100.2						337.0			275.8
Depreciation		32.3			30.6						65.1			58.5
Amortization		170.8			133.4						326.8			253.6
Change in estimated acquisition    earnout payables		18.7			9.3						2.5			50.9
EBITDAC		668.1			563.8			18	%		1,716.8			1,444.4			19	%
Net (gains) on divestitures		(2.0	)		(5.0	)					(2.5	)		(5.2	)
Acquisition integration		53.6			68.1						102.3			119.3
Workforce and lease termination    related charges		27.9			31.6						39.5			47.0
Acquisition related adjustments		37.2			10.8						61.0			22.2
Levelized foreign currency translation		—			(3.6	)					—			(4.5	)
EBITDAC, as adjusted	$	784.8		$	665.7			18	%	$	1,917.1		$	1,623.2			18	%
Net earnings margin, as reported		14.0	%		13.9	%	+ 10 bpts				18.8	%		18.0	%	+ 75 bpts
EBITDAC margin, as adjusted		33.1	%		32.1	%	+ 97 bpts				36.8	%		36.4	%	+ 35 bpts
Reported revenues	$	2,376.3		$	2,088.4					$	5,241.2		$	4,463.6
Adjusted revenues - see pages    39 and 40	$	2,374.3		$	2,075.2					$	5,212.7		$	4,455.4

Commissions and fees - The aggregate increase in base commissions and fees for the three-month period ended June 30, 2024, compared to the same period in 2023, was due to revenues associated with acquisitions that were made in the twelve-month period ended June 30, 2024 ($130.7 million), and to the organic change in base commissions and fee revenues. The organic change in base commissions and fee revenues were 7.5% and 9.6% for the three-month periods ended June 30, 2024 and 2023, respectively.

The aggregate increase in base commissions and fees for the six-month period ended June 30, 2024, compared to the same period in 2023, was due to revenues associated with acquisitions that were made in the twelve-month period ended June 30, 2024 ($374.9 million), and to the organic change in base commissions and fee revenues. The organic change in base commissions and fee revenues were 8.2% and 9.5% for the six-month periods ended June 30, 2024 and 2023, respectively.

In our property/casualty brokerage operations, during the three and six-month periods ended June 30, 2024 we saw continued strong customer retention, higher new business generation and increasing renewal premiums (premium rates and exposures). We believe these favorable trends should continue for the remainder of 2024; however, if economic conditions worsen or premium rate increases slow, we could see our revenue growth soften.

- 45 -

Items excluded from organic revenue computations yet impacting revenue comparisons for the three and six-month periods ended June 30, 2024 and 2023 include the following (in millions):

	Three-Month Period Ended June 30,									Six-Month Period Ended June 30,
Organic Revenues (Non-GAAP)	2024			2023			Change			2024			2023			Change
Base Commissions and Fees
Commission and fees, as reported	$	2,139.4		$	1,888.9			13.3	%	$	4,739.7		$	4,049.0			17.1	%
Less commission and fee revenues from acquisitions		(130.7	)		—						(374.9	)		—
Less divested operations		—			(13.2	)					—			(13.2	)
Levelized foreign currency translation		—			(7.7	)					—			(1.7	)
Organic base commission and fees	$	2,008.7		$	1,868.0			7.5	%	$	4,364.8		$	4,034.1			8.2	%
Supplemental revenues
Supplemental revenues, as reported	$	88.7		$	71.2			24.6	%	$	182.6		$	152.8			19.5	%
Less supplemental revenues from acquisitions		(2.8	)		—						(5.1	)		—
Levelized foreign currency translation		—			—						—			0.4
Organic supplemental revenues	$	85.9		$	71.2			20.7	%	$	177.5		$	153.2			15.9	%
Contingent revenues
Contingent revenues, as reported	$	59.8		$	54.2			10.3	%	$	145.8		$	126.0			15.7	%
Less contingent revenues from acquisitions		(8.5	)		—						(15.7	)		—
Levelized foreign currency translation		—			—						—			0.2
Organic contingent revenues	$	51.3		$	54.2			-5.4	%	$	130.1		$	126.2			3.1	%
Total reported commissions, fees, supplemental    revenues and contingent revenues	$	2,287.9		$	2,014.3			13.6	%	$	5,068.1		$	4,327.8			17.1	%
Less commissions, fees, supplemental revenues and    contingent revenues from acquisitions		(142.0	)		—						(395.7	)		—
Less divested operations		—			(13.2	)					—			(13.2	)
Levelized foreign currency translation		—			(7.7	)					—			(1.1	)
Total organic commissions, fees, supplemental    revenues and contingent revenues	$	2,145.9		$	1,993.4			7.7	%	$	4,672.4		$	4,313.5			8.3	%

The following is a summary of brokerage segment acquisition activity for 2024 and 2023:

	Three-month period ended June 30,				Six-month period ended June 30,
	2024		2023		2024		2023
Number of acquisitions closed		12		15		24		25
Estimated annualized revenues acquired (in millions)	$	72.0	$	349.1	$	141.2	$	418.1

In the three and six-month periods ended June 30, 2024 we issued 154,000 and 512,000 shares of our common stock at the request of sellers and/or in connection with tax-free exchange acquisitions. In the three and six-month periods ended June 30, 2023, we issued 851,000 and 1,833,000 shares of our common stock at the request of sellers and/or in connection with tax-free exchange acquisitions.

- 46 -

Supplemental and contingent revenues - Reported supplemental and contingent revenues recognized in 2024, 2023 and 2022 by quarter are as follows (in millions):

	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		YTD
2024
Reported supplemental revenues	$	93.9	$	88.7					$	182.6
Reported contingent revenues		86.0		59.8						145.8
Reported supplemental and contingent revenues	$	179.9	$	148.5					$	328.4
2023
Reported supplemental revenues	$	81.6	$	71.2	$	70.8		90.6	$	314.2
Reported contingent revenues		71.8		54.2		53.9		55.4		235.3
Reported supplemental and contingent revenues	$	153.4	$	125.4	$	124.7	$	146.0	$	549.5
2022
Reported supplemental revenues	$	74.3	$	65.7	$	64.7		80.0	$	284.7
Reported contingent revenues		71.6		43.1		52.4		40.2		207.3
Reported supplemental and contingent revenues	$	145.9	$	108.8	$	117.1	$	120.2	$	492.0

Interest income, premium finance revenues and other income - This primarily represents interest income earned on cash, cash equivalents and fiduciary cash and revenues from premium financing, income from equity investments and net gains related to divestitures and sales of books of business.

Interest income, premium finance revenues and other income in the three and six-month periods ended June 30, 2024 increased compared to the same periods in 2023, primarily due to increases in interest income on our own and fiduciary funds.

The following table provides a reconciliation of brokerage segment interest income, premium finance revenues and other income, as reported in our consolidated financial statements to interest income earned on cash, cash equivalents and fiduciary cash (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Interest income, premium finance revenues and other income	$	88.4		$	74.1		$	173.1		$	135.8
Less:
Net (gains) on divestitures		(2.0	)		(5.0	)		(2.5	)		(5.2	)
Premium financing revenues and net earnings from equity interests		(24.1	)		(20.8	)		(45.6	)		(41.0	)
Interest income from cash, cash equivalents and fiduciary cash	$	62.3		$	48.3		$	125.0		$	89.6

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Compensation expense - The following provides non-GAAP information that management believes is helpful when comparing compensation expense for the three and six-month periods ended June 30, 2024 with the same periods in 2023 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Compensation expense, as reported	$	1,370.3		$	1,196.4		$	2,847.1		$	2,402.5
Acquisition integration		(30.9	)		(38.5	)		(55.4	)		(72.6	)
Workforce and lease termination related charges		(24.9	)		(29.2	)		(35.3	)		(42.6	)
Acquisition related adjustments		(37.2	)		(10.8	)		(87.0	)		(22.2	)
Levelized foreign currency translation		—			(1.9	)		—			3.8
Compensation expense, as adjusted	$	1,277.3		$	1,116.0		$	2,669.4		$	2,268.9
Reported compensation expense ratios		57.7	%		57.3	%		54.3	%		53.8	%
Adjusted compensation expense ratios		53.8	%		53.8	%		51.2	%		50.9	%
Reported revenues	$	2,376.3		$	2,088.4		$	5,241.2		$	4,463.6
Adjusted revenues - see pages    39 and 40	$	2,374.3		$	2,075.2		$	5,212.7		$	4,455.4

The $173.9 million increase in compensation expense for the three-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to compensation associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑ $75.7 million, increases in base and incentive compensation related to the hiring of producers and other roles to service and support organic growth, stock compensation and higher benefit costs - $83.7 million in the aggregate, acquisition earnout related adjustments - $26.4 million, partially offset by reduced acquisition integration costs - $7.6 million and reduced workforce related charges - $4.3 million.

The $444.6 million increase in compensation expense for the six-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to compensation associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑ $210.3 million, increases in base and incentive compensation related to the hiring of producers and other roles to service and support organic growth, stock compensation and higher benefit costs - $194.0 million in the aggregate, increases in acquisition earnout related adjustments - $64.8 million, partially offset by reduced acquisition integration costs - $17.2 million and reduced workforce related charges - $7.3 million.

Operating expense - The following provides non-GAAP information that management believes is helpful when comparing operating expense for the three and six-month periods ended June 30, 2024 with the same periods in 2023 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Operating expense, as reported	$	337.9		$	328.2		$	677.3		$	616.7
Acquisition integration		(22.7	)		(29.6	)		(46.9	)		(46.7	)
Workforce and lease termination related charges		(3.0	)		(2.4	)		(4.2	)		(4.4	)
Levelized foreign currency translation		—			(2.7	)		—			(2.3	)
Operating expense, as adjusted	$	312.2		$	293.5		$	626.2		$	563.3
Reported operating expense ratios		14.2	%		15.7	%		12.9	%		13.8	%
Adjusted operating expense ratios		13.2	%		14.1	%		12.0	%		12.6	%
Reported revenues	$	2,376.3		$	2,088.4		$	5,241.2		$	4,463.6
Adjusted revenues - see pages    39 and 40	$	2,374.3		$	2,075.2		$	5,212.7		$	4,455.4

The $9.7 million increase in operating expense for the three-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑ $17.8 million and increased workforce related charges $0.6 million, partially offset by decreases in acquisition integration costs - $6.9 million and savings related to professional fees and lower business insurance costs - $1.8 million.

The $60.6 million increase in operating expense for the six-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑

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$46.3 million, underlying inflation of travel and entertainment costs and professional fees as well as additional investments in technology - $14.3 million, partially offset by reduced workforce related charges - $0.2 million.

Depreciation - Depreciation expense increased in the three and six-month periods ended June 30, 2024 compared to the same periods in 2023 by $1.7 million and $6.6 million, respectively. The increase in depreciation expense in 2024 compared to 2023 was due primarily to the purchases of furniture, equipment and leasehold improvements related to office consolidations and moves, and expenditures related to upgrading computer systems. Also contributing to the increase in depreciation expense was the depreciation expense associated with acquisitions completed in the twelve-month period ended June 30, 2024.

Amortization - The increase in amortization expense in the three and six-month periods ended June 30, 2024 compared to the same periods in 2023 was primarily due to the impact of amortization expense of intangible assets associated with acquisitions completed in the twelve-month period ended June 30, 2024. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2024 we wrote off $14.0 million of amortizable assets. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2023 we wrote off $3.1 million and $3.2 million respectively, of amortizable assets. We review all of our intangible assets for impairment periodically (at least annually for goodwill) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. We perform such impairment reviews at the division (i.e., reporting unit) level with respect to goodwill and at the business unit level for amortizable intangible assets. In reviewing intangible assets, if the undiscounted future cash flows were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. Expiration lists, non‑compete agreements and trade names are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names).

Change in estimated acquisition earnout payables - The change in the expense from the change in estimated acquisition earnout payables in the three and six-month periods ended June 30, 2024 compared to the same periods in 2023, was primarily due to adjustments made to the estimated fair value of earnout obligations related to revised assumptions due to rising interest rates and increased market volatility and projections of future performance. During the three-month periods ended June 30, 2024 and 2023, we recognized $14.9 million and $19.7 million, respectively, of expense related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions made in the period from 2020 to 2024. During the six-month periods ended June 30, 2024 and 2023, we recognized $33.6 million and $39.3 million, respectively, of expense related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions made in the period from 2020 to 2024. In addition, during the three-month periods ended June 30, 2024 and 2023, we recognized $3.8 million of expense and $10.4 million of income, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 30 and 34 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2024 and 2023, we recognized $31.1 million of income and $11.6 million of expense, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 58 and 45 acquisitions, respectively.

The amounts initially recorded as earnout payables for our 2020 to 2024 acquisitions were measured at fair value as of the acquisition date and are primarily based upon the estimated future operating results of the acquired entities over a two- to-three-year period subsequent to the acquisition date. The fair value of these earnout obligations is based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, we estimate the acquired entity’s future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. We estimate future earnout payments using the earnout formula and performance targets specified in each purchase agreement and these financial projections. Subsequent changes in the underlying financial projections or assumptions will cause the estimated earnout obligations to change and such adjustments are recorded in our consolidated statement of earnings when incurred. Increases in the earnout payable obligations will result in the recognition of expense and decreases in the earnout payable obligations will result in the recognition of income.

Provision for income taxes - The brokerage segment’s effective income tax rates for the three-month periods ended June 30, 2024 and 2023, were 25.4% and 25.7%, respectively. The brokerage segment’s effective income tax rates for the six-month periods ended June 30, 2024 and 2023, were 25.5% and 25.5%, respectively. We anticipate reporting an effective tax rate of approximately 24.5% to 26.5% in our brokerage segment based on known changes in tax rates in future periods.

Net earnings attributable to noncontrolling interests - The amounts reported in this line for the three-month periods ended June 30, 2024 and 2023, include noncontrolling interest earnings of $2.0 million in each period. The amounts reported in this line for the six-month periods ended June 30, 2024 and 2023, include noncontrolling interest earnings of $6.3 million and $2.8 million, respectively.

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Risk Management

The risk management segment accounted for 13% of our revenue during the six-month period ended June 30, 2024. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third-party claims management organization rather than the claim services provided by underwriting enterprises. Revenues for our risk management segment are comprised of fees generally negotiated (i) on a per-claim or per-service basis, (ii) on a cost-plus basis, or (iii) as performance-based fees. We also provide risk management consulting services that are recognized as the services are delivered.

Financial information relating to our risk management segment results for the three and six-month periods ended June 30, 2024 as compared to the same periods in 2023, is as follows (in millions, except per share, percentages and workforce data):

Statement of Earnings	Three-month period ended June 30,									Six-month period ended June 30,
	2024			2023			Change			2024			2023			Change
Fees	$	349.5		$	312.0		$	37.5		$	694.0		$	605.0		$	89.0
Interest income and other income		9.1			6.6			2.5			17.4			11.2			6.2
Revenues before reimbursements		358.6			318.6			40.0			711.4			616.2			95.2
Reimbursements		39.4			35.0			4.4			78.0			68.2			9.8
Total revenues		398.0			353.6			44.4			789.4			684.4			105.0
Compensation		219.2			190.3			28.9			433.1			370.1			63.0
Operating		67.1			67.8			(0.7	)		135.5			129.7			5.8
Reimbursements		39.4			35.0			4.4			78.0			68.2			9.8
Depreciation		6.8			9.0			(2.2	)		17.7			17.7			—
Amortization		—			1.5			(1.5	)		6.3			3.0			3.3
Change in estimated acquisition    earnout payables		0.1			0.1			—			0.2			0.3			(0.1	)
Total expenses		332.6			303.7			28.9			670.8			589.0			81.8
Earnings before income taxes		65.4			49.9			15.5			118.6			95.4			23.2
Provision for income taxes		17.6			13.2			4.4			31.5			25.2			6.3
Net earnings		47.8			36.7			11.1			87.1			70.2			16.9
Net earnings attributable to    noncontrolling interests		—			—			—			—			—			—
Net earnings attributable to    controlling interests	$	47.8		$	36.7		$	11.1		$	87.1		$	70.2		$	16.9
Diluted net earnings per share	$	0.21		$	0.17		$	0.04		$	0.39		$	0.32		$	0.07
Other information
Change in diluted net earnings per share		24	%		31	%					22	%		33	%
Growth in revenues (before    reimbursements)		13	%		19	%					15	%		17	%
Organic change in fees (before    reimbursements)		8	%		18	%					10	%		16	%
Compensation expense ratio (before    reimbursements)		61	%		60	%					61	%		60	%
Operating expense ratio (before    reimbursements)		19	%		21	%					19	%		21	%
Effective income tax rate		27	%		26	%					27	%		26	%
Workforce at end of period (includes    acquisitions)											10,103			9,032
Identifiable assets at June 30										$	1,683.4		$	1,212.8
EBITDAC
Net earnings	$	47.8		$	36.7		$	11.1		$	87.1		$	70.2		$	16.9
Provision for income taxes		17.6			13.2			4.4			31.5			25.2			6.3
Depreciation		6.8			9.0			(2.2	)		17.7			17.7			—
Amortization		—			1.5			(1.5	)		6.3			3.0			3.3
Change in estimated acquisition    earnout payables		0.1			0.1			—			0.2			0.3			(0.1	)
EBITDAC	$	72.3		$	60.5		$	11.8		$	142.8		$	116.4		$	26.4

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The following provides non-GAAP information that management believes is helpful when comparing EBITDAC and adjusted EBITDAC for the three and six-month periods ended June 30, 2024 to the same periods in 2023 (in millions):

	Three-month period ended June 30,									Six-month period ended June 30,
	2024			2023			Change			2024			2023			Change
Net earnings, as reported	$	47.8		$	36.7			30	%	$	87.1		$	70.2			24	%
Provision for income taxes		17.6			13.2						31.5			25.2
Depreciation		6.8			9.0						17.7			17.7
Amortization		—			1.5						6.3			3.0
Change in estimated acquisition    earnout payables		0.1			0.1						0.2			0.3
Total EBITDAC		72.3			60.5			20	%		142.8			116.4			23	%
Net (gains) losses on divestitures		(0.1	)		(0.1	)					0.1			(0.2	)
Acquisition integration		0.2			0.2						0.9			0.8
Workforce and lease termination    related charges		1.4			1.0						2.6			1.6
Acquisition related adjustments		0.1			0.1						0.2			0.2
Levelized foreign currency translation		—			(0.1	)					—			(0.3	)
EBITDAC, as adjusted	$	73.9		$	61.6			20	%	$	146.6		$	118.5			24	%
Net earnings margin (before    reimbursements), as reported		13.3	%		11.5	%	+ 181 bpts				12.2	%		11.4	%	+ 85 bpts
EBITDAC margin (before    reimbursements), as adjusted		20.6	%		19.4	%	+ 123 bpts				20.6	%		19.3	%	+ 131 bpts
Reported revenues (before    reimbursements)	$	358.6		$	318.6					$	711.4		$	616.2
Adjusted revenues (before    reimbursements) - see pages 39 and 40	$	358.5		$	317.8					$	711.5		$	614.2

Fees - In our risk management operations, for the three-month period ended June 30, 2024, new core workers' compensation and general liability claims arising improved from existing clients and new clients coming on board in 2023 and 2024. We believe these favorable new arising claim trends should continue for the remainder of 2024 however, worsening economic conditions or a reversal in the number of workers employed could cause fewer new liability and core workers' compensation claims to arise in future quarters. Organic change in fee revenues for the three-month period ended June 30, 2024 was 7.7% compared to 18.1% for the same period in 2023. Organic change in fee revenues for the six-month period ended June 30, 2024 was 10.4% compared to 16.2% for the same period in 2023.

Items excluded from organic fee computations yet impacting revenue comparisons for the three and six-month periods ended June 30, 2024 and 2023 include the following (in millions):

	Three-Month Period Ended June 30									Six-Month Period Ended June 30
Organic Revenues (Non-GAAP)	2024			2023			Change			2024			2023			Change
Fees	$	347.0		$	306.6			13.2	%	$	688.9		$	595.4			15.7	%
International performance bonus fees		2.5			5.4						5.1			9.6
Fees as reported		349.5			312.0			12.0	%		694.0			605.0			14.7	%
Less fees from acquisitions		(14.4	)		—						(28.1	)		—
Levelized foreign currency translation		—			(0.7	)					—			(1.8	)
Organic fees	$	335.1		$	311.3			7.7	%	$	665.9		$	603.2			10.4	%

Reimbursements - Reimbursements represent amounts received from clients reimbursing us for certain third-party costs associated with providing our claims management services. In certain service partner relationships, we are considered a principal because we direct the third party, control the specified service and combine the services provided into an integrated solution. Given this principal relationship, we are required to recognize revenue on a gross basis and service partner vendor fees in the operating expense line in our consolidated statement of earnings.

- 51 -

Interest income and other income - Interest income and other income primarily represents interest income earned on cash, cash equivalents and fiduciary cash. Interest income and other income in the three and six-month periods ended June 30, 2024 increased compared to the same periods in 2023, primarily due to increases in interest income from increases in interest rates earned on fiduciary cash.

Compensation expense - The following provides non-GAAP information that management believes is helpful when comparing compensation expense for the three and six-month periods ended June 30, 2024 with the same periods in 2023 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Compensation expense, as reported	$	219.2		$	190.3		$	433.1		$	370.1
Acquisition integration		—			(0.2	)		(0.6	)		(0.8	)
Workforce and lease termination related charges		(0.9	)		(0.5	)		(1.7	)		(0.9	)
Acquisition related adjustments		(0.1	)		(0.1	)		(0.2	)		(0.2	)
Levelized foreign currency translation		—			(0.5	)		—			(1.3	)
Compensation expense, as adjusted	$	218.2		$	189.0		$	430.6		$	366.9
Reported compensation expense ratios (before    reimbursements)		61.1	%		59.7	%		60.9	%		60.1	%
Adjusted compensation expense ratios (before    reimbursements)		60.9	%		59.5	%		60.5	%		59.7	%
Reported revenues (before reimbursements)	$	358.6		$	318.6		$	711.4		$	616.2
Adjusted revenues (before reimbursements) -    see pages 39 and 40	$	358.5		$	317.8		$	711.5		$	614.2

The $28.9 million increase in compensation expense for the three-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to compensation associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑ $6.8 million, increases in base and incentive compensation related to the hiring of producers and other roles to service and support organic growth, stock compensation and higher benefit costs - $21.9 million in the aggregate, and increase in workforce related charges - $0.4 million, partially offset by reduced acquisition integration costs - $0.2 million.

The $63.0 million increase in compensation expense for the six-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to increases in base and incentive compensation and higher benefit costs - $50.0 million in the aggregate, and compensation associated with the acquisitions completed in the twelve-month period ended June 30, 2024 ‑ $13.0 million.

Operating expense - The following provides non-GAAP information that management believes is helpful when comparing operating expense for the three and six-month periods ended June 30, 2024 with the same periods in 2023 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Operating expense, as reported	$	67.1		$	67.8		$	135.5		$	129.7
Acquisition integration		(0.2	)		—			(0.3	)		—
Workforce and lease termination related charges		(0.5	)		(0.5	)		(0.9	)		(0.7	)
Levelized foreign currency translation		—			(0.1	)		—			(0.2	)
Operating expense, as adjusted	$	66.4		$	67.2		$	134.3		$	128.8
Reported operating expense ratios (before    reimbursements)		18.7	%		21.3	%		19.1	%		21.1	%
Adjusted operating expense ratios (before    reimbursements)		18.5	%		21.2	%		18.9	%		21.0	%
Reported revenues (before reimbursements)	$	358.6		$	318.6		$	711.4		$	616.2
Adjusted revenues (before reimbursements) -    see pages 39 and 40	$	358.5		$	317.8		$	711.5		$	614.2

The $0.7 million decrease in operating expense for the three-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended June 30, 2024 -

- 52 -

$2.6 million and an increase in acquisition integration costs - $0.2 million, being more than offset by savings in client-related expenses and professional fees - $3.5 million in the aggregate.

The $5.8 million increase in operating expense for the six-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to expenses associated with the acquisitions completed in the twelve-month period ended June 30, 2024 - $5.6 million increases in acquisition integration costs - $0.3 million and workforce related charges - $0.2 million, partially offset by savings in client-related expenses and professional fees - $0.3 million in the aggregate.

Depreciation - Depreciation decreased in the three-month period ended June 30, 2024 compared to the same period in 2023 by $2.2 million and was flat in the six-month period ended June 30, 2024 compared to the same period in 2023, due to the true up of depreciation expense related to valuation adjustments made to acquired software in the quarter on the My Plan Manager acquisition that was completed in December 2023. Depreciation expense also reflects expenditures related to upgrading computer systems, partially offset by the impact of office consolidations that occurred as leases expired in 2023 and 2022 (less depreciation associated with furniture, equipment and leasehold improvements).

Amortization - Amortization expense in the three-month period ended June 30, 2024 was zero due to the normal recurring quarterly amortization expense being offset by a true up of amortization expense related to valuation adjustments made to amortizable assets in the quarter for the My Plan Manager acquisition that was completed in December 2023. Provisional estimates of fair value were used by us to initially record the acquisition of My Plan Manager as of the acquisition date. We used an independent third party valuation specialist to assist us in determining the fair value of assets acquired and liabilities assumed for this transaction that was completed in the three-month period ended June 30, 2024. The amortization expense increased in the six-month period ended June 30, 2024 compared to the same period in 2023 by $3.3 million, primarily due to the acquisition of My Plan Manager. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2024 and 2023, no impairments were noted.

Change in estimated acquisition earnout payables - The change in expense from the change in estimated acquisition earnout payables in the three and six-month periods ended June 30, 2024 to the same period in 2023, was due to accretion of the discount. During the three-month periods ended June 30, 2024 and 2023, we recognized $0.1 million of expense in each period, related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. During the six-month periods ended June 30, 2024 and 2023, we recognized $0.2 million and $0.3 million, respectively, of expense, related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions.

Provision for income taxes - The risk management segment’s effective income tax rates for the three-month periods ended June 30, 2024 and 2023, were 26.9% and 26.5%, respectively. The risk management segment’s effective income tax rates for the three-month periods ended June 30, 2024 and 2023, were 26.6% and 26.4%, respectively. We anticipate reporting an effective tax rate on adjusted results of approximately 25.0% to 27.0% in our risk management segment based on known changes in tax rates in future periods.

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Corporate

The corporate segment reports the financial information related to our clean energy and other investments, our debt, certain corporate and acquisition-related activities and the impact of foreign currency remeasurement. For a detailed discussion of the nature of these investments, see Note 14 to our most recent Annual Report on Form 10‑K as of December 31, 2023. For a detailed discussion of the nature of our debt, see Note 6 to our unaudited consolidated financial statements included herein as of June 30, 2024 and in Note 8 to our most recent Annual Report on Form 10‑K as of December 31, 2023.

Financial information relating to our corporate segment results for the three and six-month periods ended June 30, 2024 compared to the same periods in 2023 is as follows (in millions, except per share):

	Three-month period ended June 30,									Six-month period ended June 30,
Statement of Earnings	2024			2023			Change			2024			2023			Change
Other income	$	1.1		$	(0.1	)	$	1.2		$	1.5		$	—		$	1.5
Total revenues		1.1			(0.1	)		1.2			1.5			—			1.5
Compensation		30.6			26.3			4.3			65.8			55.9			9.9
Operating		20.6			37.6			(17.0	)		48.5			69.7			(21.2	)
Interest		94.3			77.8			16.5			186.5			145.7			40.8
Depreciation		1.7			1.2			0.5			3.4			2.3			1.1
Total expenses		147.2			142.9			4.3			304.2			273.6			30.6
Loss before income taxes		(146.1	)		(143.0	)		(3.1	)		(302.7	)		(273.6	)		(29.1	)
Benefit for income taxes		(50.9	)		(51.8	)		0.9			(128.3	)		(120.2	)		(8.1	)
Net loss		(95.2	)		(91.2	)		(4.0	)		(174.4	)		(153.4	)		(21.0	)
Net loss attributable to    noncontrolling interests		—			(0.7	)		0.7			—			(1.4	)		1.4
Net loss attributable to    controlling interests	$	(95.2	)	$	(90.5	)	$	(4.7	)	$	(174.4	)	$	(152.0	)	$	(22.4	)
Diluted net loss per share	$	(0.43	)	$	(0.41	)	$	(0.02	)	$	(0.78	)	$	(0.69	)	$	(0.09	)
Identifiable assets at June 30										$	2,547.6		$	2,528.6
EBITDAC
Net loss	$	(95.2	)	$	(91.2	)	$	(4.0	)	$	(174.4	)	$	(153.4	)	$	(21.0	)
Benefit for income taxes		(50.9	)		(51.8	)		0.9			(128.3	)		(120.2	)		(8.1	)
Interest		94.3			77.8			16.5			186.5			145.7			40.8
Depreciation		1.7			1.2			0.5			3.4			2.3			1.1
EBITDAC	$	(50.1	)	$	(64.0	)	$	13.9		$	(112.8	)	$	(125.6	)	$	12.8

Revenues - Revenues in the corporate segment primarily consist of income from the run-off of legacy investments.

Compensation expense - Compensation expense in the three-month periods ended June 30, 2024 and 2023, includes salary, incentive compensation, and associated benefit expenses of $30.6 million and $26.3 million, respectively. The change in compensation expense for the three-month period ended June 30, 2024 compared to the same period in 2023 was primarily due to increased incentive compensation and benefits expense.

Compensation expense in the six-month periods ended June 30, 2024 and 2023, includes salary, incentive compensation, and associated benefit expenses of $65.8 million and $55.9 million, respectively. The change in compensation expense for the six-month period ended June 30, 2024 compared to the same period in 2023 was primarily due to increased costs associated with stock-based benefits as well as increased incentive compensation and benefits expense.

Operating expense - Operating expense in the three-month period ended June 30, 2024, includes banking and related fees of $0.7 million, external professional fees and other due diligence costs related to acquisitions of $6.0 million, which includes transaction-related costs as described on page 57 in note (2), other corporate and clean energy related expenses, including litigation matters, technology and other professional fees of $11.7 million, and a net unrealized foreign exchange remeasurement loss of $(2.2) million.

Operating expense in the six-month period ended June 30, 2024, includes banking and related fees of $1.6 million, external professional fees and other due diligence costs related to acquisitions of $9.8 million, which includes transaction-related costs as

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described on page 57 in note (2), other corporate and clean energy related expenses, including litigation matters, technology and other professional fees of $35.5 million, and a net unrealized foreign exchange remeasurement loss of $(1.6) million.

Operating expense in the three-month period ended June 30, 2023 includes banking and related fees of $0.7 million, external professional fees and other due diligence costs related to acquisitions of $6.4 million, which includes $3.2 million of transaction‑related costs as described on page 57 in note (2), other corporate and clean energy related expenses, including litigation matters, costs associated with a triennial corporate-wide meeting, technology and professional fees of $20.9 million, and a net unrealized foreign exchange remeasurement loss of $(9.6) million.

Operating expense in the six-month period ended June 30, 2023 includes banking and related fees of $1.5 million, external professional fees and other due diligence costs related to acquisitions of $14.8 million, which includes $7.6 million of transaction‑related costs as described on page 57 in note (2), other corporate and clean energy related expenses, including litigation matters, costs associated with a triennial corporate-wide meeting, technology and professional fees of $43.7 million, and a net unrealized foreign exchange remeasurement loss of $(9.7) million.

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Interest expense - The increase in interest expense for the three and six-month periods ended June 30, 2024 compared to the same periods in 2023, was due to the following:

Change in interest expense related to:	Three-month period ended June 30, 2024			Six-month period ended June 30, 2024
Interest on borrowings from our Credit Agreement	$	(3.7	)	$	(2.6	)
Interest on the maturity of the Series H notes		(3.8	)		(5.0	)
Interest on the maturity of the Series E notes		—			(0.3	)
Interest on the maturity of the Series N notes		(2.0	)		(4.1	)
Interest on the prepayment of the Series CC notes		(0.8	)		(1.6	)
Interest on the maturity of the Series HH notes		(1.2	)		(1.8	)
Interest on the $950.0 million senior notes funded on    March 2, 2023		—			9.2
Interest on the $1,000.0 million senior notes funded on    November 2, 2023		16.9			33.7
Interest on the $1,000.0 million senior notes funded on    February 15, 2024		14.2			21.3
Amortization of hedge gains/losses		(3.1	)		(8.0	)
Net change in interest expense	$	16.5		$	40.8

Depreciation - Depreciation expense in the three and six-month periods ended June 30, 2024 relates to corporate home office related assets.

Benefit for income taxes - We allocate the provision for income taxes to the brokerage and risk management segments using local country statutory rates. Our consolidated effective tax rate for the three-month period ended June 30, 2024 was 21.9% compared to 20.7% for the same period in 2023. Our consolidated effective tax rate for the six-month period ended June 30, 2024 was 21.1% compared to 20.0% for the same period in 2023.

Net loss attributable to noncontrolling interests - The amounts reported in this line for the three-month periods ended June 30, 2024 and 2023 include noncontrolling interest loss of zero and $(0.7) million, respectively, related to our investment in Chem-Mod LLC. The amounts reported in this line for the six-month periods ended June 30, 2024 and 2023 include noncontrolling interest loss of zero and $(1.4) million, respectively, related to our investment in Chem-Mod LLC. As of June 30, 2024, we held a 46.5% controlling interest in Chem-Mod LLC. Also included in net earnings attributable to noncontrolling interests are offsetting amounts related to non-Gallagher owned interests in several clean energy investments.

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The following provides non-GAAP information that we believe is helpful when comparing our operating results for the three and six-month periods ended June 30, 2024 and 2023 for the corporate segment (in millions):

	2024									2023
																Net Earnings
				Income			(Loss)						Income			(Loss)
				Tax			Attributable to						Tax			Attributable to
	Pretax			(Provision)			Controlling			Pretax			(Provision)			Controlling
Three-Month Periods Ended June 30,	Loss			Benefit			Interests			Loss			Benefit			Interests
Interest and banking costs	$	(95.0	)	$	24.7		$	(70.3	)	$	(78.5	)	$	20.4		$	(58.1	)
Clean energy related (1)		(2.2	)		0.4			(1.8	)		(3.2	)		0.8			(2.4	)
Acquisition costs (2)		(7.3	)		1.2			(6.1	)		(6.9	)		1.0			(5.9	)
Corporate (3) (4)		(41.6	)		24.6			(17.0	)		(53.7	)		29.6			(24.1	)
Corporate, as reported		(146.1	)		50.9			(95.2	)		(142.3	)		51.8			(90.5	)
Adjustments
Transaction-related costs (2)		2.8			(0.5	)		2.3			3.2			(0.8	)		2.4
Legal and tax related (3)		—			—			—			5.5			(0.5	)		5.0
Components of Corporate    Segment, as adjusted
Interest and banking costs		(95.0	)		24.7			(70.3	)		(78.5	)		20.4			(58.1	)
Clean energy related (1)		(2.2	)		0.4			(1.8	)		(3.2	)		0.8			(2.4	)
Acquisition costs		(4.5	)		0.7			(3.8	)		(3.7	)		0.2			(3.5	)
Corporate (3) (4)		(41.6	)		24.6			(17.0	)		(48.2	)		29.1			(19.1	)
Adjusted three months	$	(143.3	)	$	50.4		$	(92.9	)	$	(133.6	)	$	50.5		$	(83.1	)

	2024									2023
							Net Earnings									Net Earnings
				Income			(Loss)						Income			(Loss)
				Tax			Attributable to						Tax			Attributable to
	Pretax			(Provision)			Controlling			Pretax			(Provision)			Controlling
Six-Month Periods Ended June 30,	Loss			Benefit			Interests			Loss			Benefit			Interests
Interest and banking costs	$	(188.1	)	$	48.9		$	(139.2	)	$	(147.2	)	$	38.3		$	(108.9	)
Clean energy related (1)		(4.1	)		0.9			(3.2	)		(5.4	)		1.4			(4.0	)
Acquisition costs (2)		(12.0	)		2.0			(10.0	)		(16.4	)		2.5			(13.9	)
Corporate (3) (4)		(98.5	)		76.5			(22.0	)		(103.2	)		78.0			(25.2	)
Corporate, as reported		(302.7	)		128.3			(174.4	)		(272.2	)		120.2			(152.0	)
Adjustments
Transaction-related costs (2)		6.0			(1.0	)		5.0			7.6			(1.9	)		5.7
Legal and tax related (3)		—			—			—			5.5			(0.5	)		5.0
Components of Corporate    Segment, as adjusted
Interest and banking costs		(188.1	)		48.9			(139.2	)		(147.2	)		38.3			(108.9	)
Clean energy related (1)		(4.1	)		0.9			(3.2	)		(5.4	)		1.4			(4.0	)
Acquisition costs		(6.0	)		1.0			(5.0	)		(8.8	)		0.6			(8.2	)
Corporate (4)		(98.5	)		76.5			(22.0	)		(97.7	)		77.5			(20.2	)
Adjusted six months	$	(296.7	)	$	127.3		$	(169.4	)	$	(259.1	)	$	117.8		$	(141.3	)

(1)Pretax loss for the three-month periods ended June 30, 2024 and 2023 is presented net of amounts attributable to noncontrolling interests of zero and $(0.7) million, respectively. Pretax loss for the six-month periods ended June 30, 2024 and 2023 is presented net of amounts attributable to noncontrolling interests of zero and $(1.4) million, respectively.

(2)We incurred transaction-related costs, which include legal, consulting, employee compensation and other professional fees primarily associated with our acquisitions of Willis Re, Buck, which closed on April 3, 2023, and the acquisitions of Cadence Insurance, Eastern Insurance and My Plan Manager, all of which closed in fourth quarter 2023.

(3)Adjustments in second quarter 2023 include additional U.K. income tax expense related to the non-deductibility of acquisition‑related adjustments made in the quarter and costs associated with legal and tax matters.

(4)Corporate pretax loss includes a net unrealized foreign exchange remeasurement loss of $(2.2) million in second quarter 2024 and a net unrealized foreign exchange remeasurement loss of $(9.6) million in second quarter 2023. Corporate pretax loss

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includes a net unrealized foreign exchange remeasurement loss of $(1.6) million in the six-month period ended June 30, 2024 and a net unrealized foreign exchange remeasurement loss of $(9.7) million in the six-month period ended June 30, 2023.

Interest and banking costs and debt - Interest and banking costs includes expenses related to our debt.

Clean energy - For 2024, this consists of the operating results related to our investments in new clean energy projects.

Acquisition costs - Consists mostly of external professional fees and other due diligence costs related to our acquisitions. On occasion, we enter into forward currency hedges for the purchase price of committed, but not yet funded, acquisitions with funding requirements in currencies other than the U.S. dollar. The gains or losses, if any, associated with these hedge transactions are also included in acquisition costs.

Corporate - Consists of overhead allocations mostly related to corporate staff compensation, other corporate level activities, and net unrealized foreign exchange remeasurement. In addition, it includes the tax expense related to partial taxation of foreign earnings, nondeductible executive compensation and entertainment expenses, the tax benefit from vesting of employee equity awards, as well as other permanent or discrete tax items not reflected in the provision for income taxes in the brokerage and risk management segments. The income tax benefit of stock-based awards that vested or were settled in the six-month periods ended June 30, 2024 and 2023, was $63.0 million and $46.8 million, respectively, and is included in the table above in the Corporate line.

Clean energy investments - Please refer to our filings with the SEC, including Item 1A, “Risk Factors,” on pages 11 through 30 of our Annual Report on Form 10‑K for the fiscal year ended December 31, 2023, for a more detailed discussion of these and other factors that could impact the information above.

Liquidity and Capital Resources

Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations. The insurance brokerage and risk management industries are not capital intensive. Historically, our capital requirements have primarily included dividend payments on our common stock, repurchases of our common stock, funding of our investments, acquisitions of brokerage and risk management operations and capital expenditures, including investments being made in IT software development projects.

Operating Cash Flows

Historically, we have depended on our ability to generate positive cash flow from operations to meet a substantial portion of our cash requirements. We believe that our cash flows from operations and borrowings under our Credit Agreement (as defined below) will provide us with adequate resources to meet our liquidity needs in the foreseeable future. To fund acquisitions made during 2023 and for the six-month period ended June 30, 2024, we relied on a combination of net cash flows from operations, proceeds from borrowings under our Credit Agreement, and proceeds from issuances of senior unsecured notes and issuance of our common stock.

Cash provided by operating activities was $908.8 million and $440.9 million for the six-month periods ended June 30, 2024 and 2023, respectively. The increase in cash provided by operating activities during the six-month period ended June 30, 2024 compared to the same period in 2023, was primarily due to growth in our core brokerage and risk management operations and timing differences between periods with cash receipts and disbursements related to accounts receivables and accrued compensation and other current liabilities compared to the same period in 2023.

During the six-month period ended June 30, 2024 employee matching contributions to the 401(k) plan of $86.0 million relating to 2023 were funded using common stock. During the six-month period ended June 30, 2023, employee matching contributions to the 401(k) plan of $73.8 million relating to 2022 were funded using common stock.

When assessing our overall liquidity, we believe that the focus should be on net earnings as reported in our consolidated statement of earnings, adjusted for non‑cash items (i.e., EBITDAC), and cash provided by operating activities in our consolidated statement of cash flows. Consolidated EBITDAC was $1,746.8 million and $1,435.2 million for the six-month periods ended June 30, 2024 and 2023, respectively. Net earnings attributable to controlling interests were $891.8 million and $721.0 million for the six-month periods ended June 30, 2024 and 2023, respectively. We believe that EBITDAC items are indicators of trends in liquidity.

Defined Benefit Pension Plan

Our policy for funding our defined benefit pension plan is to contribute amounts at least sufficient to meet the minimum funding

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requirements under the IRC. The Employee Retirement Income Security Act of 1974, as amended (which we refer to as ERISA), could impose a minimum funding requirement for our plan. We are not required to make any minimum contributions to the plan for the 2024 plan year, nor were we required to make any minimum contributions to the plan for the 2023 plan year. Funding requirements are based on the plan being frozen and the aggregate amount of our historical funding. The plan’s actuaries determine contribution rates based on our funding practices and requirements. Funding amounts may be influenced by future asset performance, the level of discount rates and other variables impacting the assets and/or liabilities of the plan. In addition, amounts funded in the future, to the extent not due under regulatory requirements, may be affected by alternative uses of our cash flows, including dividends, acquisitions and common stock repurchases. We did not make any discretionary contributions to the plan during the six-month periods ended June 30, 2024 and 2023. We are not considering making any discretionary contributions to the plan in 2024, but may be required to make minimum contributions to the plan in future periods.

Investing Cash Flows

Capital Expenditures - Capital expenditures were $61.5 million and $88.8 million for each of the six-month periods ended June 30, 2024 and 2023, respectively. In 2024, we expect total expenditures for capital improvements to be approximately $150.0 million, part of which is related to expenditures on office moves and investments being made in IT and software development projects. Capital expenditures decreased in 2024 compared to 2023 primarily due to less acquisition integration related expenditures, differences in the period over period timing of expenditures related to investments in information technology, and by the movement of information technology to cloud computing based technology from in‑house hosted environments. Expenditures made related to cloud computing based technology are accounted for as deferred costs versus fixed assets, which would reduce capital expenditures.

Acquisitions - Cash paid for acquisitions, net of cash and restricted cash acquired, was $518.6 million and $1,049.5 million in the six-month periods ended June 30, 2024 and 2023, respectively. In addition, during the six-month period ended June 30, 2024, we issued 0.6 million shares ($133.8 million) of our common stock as payment for a portion of the total consideration paid for 2024 acquisitions and earnout payments made in 2024. During the six-month period ended June 30, 2023, we issued 1.8 million shares ($365.1 million) of our common stock as payment for consideration paid for 2023 acquisitions and earnout payments made in 2023. We completed twenty-four and twenty-five acquisitions in the six-month periods ended June 30, 2024 and 2023, respectively. Annualized revenues of businesses acquired in the six-month periods ended June 30, 2024 and 2023 totaled approximately $141.2 million and $418.1 million, respectively. For the remainder of 2024, we expect to use new debt, our Credit Agreement, cash from operations and our common stock, or a combination thereof to fund all of the acquisitions we complete.

If liquidity concerns arise, we may be more likely to issue common stock to fund acquisitions.

Dispositions - During each of the six-month periods ended June 30, 2024 and 2023, we sold several books of business and recognized net gains of $2.4 million and $5.4 million, respectively. We received net cash proceeds of $1.7 million and $4.8 million, respectively, in these 2024 and 2023 transactions.

Financing Cash Flows

At June 30, 2024, we had $4,550.0 million of Senior Notes, $3,523.0 million of corporate related borrowings outstanding, $80.0 million of borrowings outstanding under our Credit Agreement, $207.8 million of borrowings outstanding under our Premium Financing Debt Facility and a cash and cash equivalent balance of $1,415.3 million.

The Senior Notes, Note Purchase Agreements, the Credit Agreement and the Premium Financing Debt Facility contain various financial covenants that require us to maintain specified financial ratios. We were in compliance with these covenants at June 30, 2024.

Senior Notes - On February 12, 2024, we closed and funded an offering of $1,000.0 million of unsecured senior notes in two tranches. The $500.0 million aggregate principal amount of 5.45% Senior Notes is due in 2034 (which we refer to as the 2034 July Notes) and $500.0 million aggregate principal amount of 5.75% Senior Notes is due in 2054 (which we refer to as the 2054 July Notes). The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2023, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1.4 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

On November 2, 2023, we closed and funded an offering of $1,000.0 million of unsecured senior notes in two tranches. The $400.0 million aggregate principal amount of 6.50% Senior Notes is due in 2034 (which we refer to as the 2034 Notes) and $600.0 million aggregate principal amount of 6.75% Senior Notes is due in 2054 (which we refer to as the 2054 Notes). The weighted average interest rate is 5.97% per annum after giving effect to underwriting costs and a net hedge gain. During 2021 through 2023, we entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash gain of approximately

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$128.0 million on the hedging transactions that will be recognized on a pro rata basis as a decrease to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

On March 2, 2023, we closed and funded an offering of $950.0 million of unsecured senior notes in two tranches. The $350.0 million aggregate principal amount of 5.50% Senior Notes is due in 2033 (which we refer to as the 2033 Notes) and $600.0 million aggregate principal amount of 5.75% Senior Notes is due in 2053 (which we refer to as the 2053 Notes). The weighted average interest rate is 5.05% per annum after giving effect to underwriting costs and a net hedge gain. During 2019 through 2022, we entered into a pre‑issuance interest rate hedging transaction related to these notes. We realized a net cash gain of approximately $112.7 million on the hedging transactions that will be recognized on a pro rata basis as a decrease to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

Note Purchase Agreement - During February 2024, we used operating cash to fund the $100.0 million Series HH note maturity that had a fixed rate of 4.72% that was due February 13, 2024.

During February 2024, we used operating cash to fund the $325.0 million Series H note maturity that had a fixed rate of 4.58% that was due February 27, 2024.

During June 2023, we used operating cash to fund the $200.0 million Series N note maturity that had a fixed rate of 4.13% that was due June 24, 2023.

During June 2023, we used operating cash to fund the prepayment of the $50.0 million Series CC note that had a floating rate of 90 day LIBOR plus 1.40%, balloon that was originally due on June 13, 2024.

During February 2023, we used operating cash to fund the $50.0 million Series E note maturity that had a fixed rate of 5.49% that was due February 10, 2023.

Credit Agreement - On June 22, 2023, we entered into a new Credit Agreement (which we refer to as the Credit Agreement) with an administrative agent and a group of other lenders. The Credit Agreement provides for a five-year unsecured revolving credit facility in the amount of $1,200.0 million (including a $75.0 million letter of credit sub-facility), which is also available in Pounds Sterling, Canadian Dollars, Australian Dollars, New Zealand Dollars, Euros, Japanese Yen and any other currencies agreed by the lenders. On November 7, 2023, we entered into the First Amendment to the Credit Agreement, pursuant to which we increased the commitments under the Credit Agreement up to $1,700.0 million. There were $80.0 million of borrowings outstanding under the Credit Agreement at June 30, 2024. Due to the outstanding borrowing and letters of credit, $1,608.4 million remained available for potential borrowings under the Credit Agreement at June 30, 2024.

We use the Credit Agreement to post letters of credit and to borrow funds to supplement our operating cash flows from time to time. In the six-month period ended June 30, 2024, we borrowed an aggregate of $1,663.2 million and repaid $1,826.9 million under our Credit Agreement. Principal uses of the 2024 and 2023 borrowings under the Credit Agreement were to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

Premium Financing Debt Facility - On October 31, 2023, we entered into an amendment to our revolving loan facility (which we refer to as the Premium Financing Debt Facility), that provides funding for the three Australian (AU) and New Zealand (NZ) premium finance subsidiaries. The Premium Financing Debt Facility is comprised of: (i) Facility B, which is separated into AU$390.0 million and NZ$10.0 million tranches (the NZ$ tranche will be increased as of October 1, 2024 to NZ$25.0 million), (ii) Facility C, which is an AU$60.0 million equivalent multi-currency overdraft tranche and (iii) Facility D, which is a NZ$15.0 million equivalent multi-currency overdraft tranche.

At June 30, 2024, AU$300.0 million of borrowings were outstanding under Facility B, with no borrowings outstanding under the NZ$ tranche of Facility B. There were no borrowings outstanding under Facility C and NZ$13.4 million of borrowings were outstanding under Facility D, which in aggregate amount to US$207.8 million of borrowings outstanding under the Premium Financing Debt Facility.

Dividends - Our board of directors determines our dividend policy. Our board of directors determines dividends on our common stock on a quarterly basis after considering our available cash from earnings, our anticipated cash needs and current conditions in the economy and financial markets.

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In the six-month period ended June 30, 2024, we declared $263.5 million in cash dividends on our common stock, or $0.60 per common share, a 9% increase over the six-month period ended June 30, 2023. On July 24, 2024, we announced a quarterly dividend for second quarter 2024 of $0.60 per common share. This dividend level in 2024 will result in annualized net cash used by financing activities in 2024 of approximately $525.3 million (based on the number of outstanding shares as of June 30, 2024) or an anticipated increase in cash used of approximately $51.7 million compared to 2023. We make no assurances regarding the amount of any future dividend payments.

Shelf Registration Statement - On February 12, 2024, we filed a shelf registration statement on Form S-3 with the SEC, registering the offer and sale from time to time, of an indeterminate amount of debt securities, guarantees, common stock, preferred stock, warrants, depositary shares, purchase contracts, or units. The availability of the potential liquidity under this shelf registration statement depends on investor demand, market conditions and other factors. We make no assurances regarding when, or if, we will issue any securities under this registration statement. On November 15, 2022, we filed a shelf registration statement on Form S-4 with the with the SEC, registering 7.0 million shares of our common stock that we may offer and issue from time to time in connection with future acquisitions of other businesses, assets or securities. At June 30, 2024, 5.6 million shares remained available for issuance under this registration statement.

Common Stock Repurchases - We have in place a common stock repurchase plan approved by our board of directors in July 2021, that authorizes the repurchase of up to $1.5 billion of common stock. During the six-month periods ended June 30, 2024 and 2023, we did not repurchase shares of our common stock. The plan authorizes the repurchase of our common stock at such times and prices, as we may deem advantageous, in transactions on the open market or in privately negotiated transactions. We are under no commitment or obligation to repurchase any particular number of shares, and the plan may be suspended at any time at our discretion. Management may consider repurchasing common stock during the remainder of 2024 to the extent that our available cash exceeds acquisition opportunities. Funding for share repurchases may come from a variety of sources, including cash from operations, short-term or long‑term borrowings under our Credit Agreement or other sources. See “Issuer Purchases of Equity Securities” below for more information regarding shares repurchased during the quarter.

At-the-Market Equity Program - On March 14, 2024, we entered into an updated Equity Distribution Agreement with Morgan Stanley & Co. LLC, pursuant to which we may offer and sell, from time to time, up to 3,000,000 shares of our common stock through Morgan Stanley as sales agent. We intend to use the net proceeds of sales under this program to fund future acquisitions from time to time or for general corporate purposes. Pursuant to the agreement, shares may be sold by means of ordinary brokers’ transactions, including on the New York Stock Exchange, at market prices prevailing at the time of sale, at prices related to the prevailing market prices, or at negotiated prices, in block transactions, or as otherwise agreed upon by us and Morgan Stanley. During the quarter ended June 30, 2024, we did not sell shares of our common stock under the program.

Common Stock Issuances - Another source of liquidity to us is the issuance of our common stock pursuant to our stock option and employee stock purchase plans. Proceeds from the issuance of common stock under these plans for the six-month periods ended June 30, 2024 and 2023, were $93.5 million and $66.0 million, respectively. On May 10, 2022, our stockholders approved the 2022 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved 2017 Long-Term Incentive Plan. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. Awards that may be granted under the LTIP include non-qualified and incentive stock options, stock appreciation rights, restricted stock units and performance units, any or all of which may be made contingent upon the achievement of performance criteria. Stock options with respect to 10.9 million shares (less any shares of restricted stock issued under the LTIP - 2.5 million shares of our common stock were available for this purpose as of June 30, 2024) were available for grant under the LTIP at June 30, 2024. Our employee stock purchase plan allows our employees to purchase our common stock at 95% of its fair market value. Proceeds from the issuance of our common stock related to these plans have contributed favorably to net cash provided by financing activities in the six-month periods ended June 30, 2024 and 2023, and we believe this favorable trend will continue in the foreseeable future.

We have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan’s age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5.0% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning with the match paid in 2021, the amount matched by the company will be discretionary and annually determined by management. Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or company stock. We expensed (net of plan forfeitures) $56.0 million and $42.3 million related to the plan in the six-month periods ended June 30, 2024 and 2023, respectively. During 2023, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2023 plan year to be funded with our common stock, which we funded in February 2024. During 2022, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2022 plan year to be funded with our common stock, which we funded in February 2023.

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Outlook - We believe that we have sufficient capital and access to additional capital to meet our short- and long-term cash flow needs.

Critical Accounting Estimates

There have been no changes in our critical accounting estimates, which include revenue recognition, income taxes and intangible assets/earnout obligations, as discussed in our Annual Report on Form 10-K for the year ended December 31, 2023.

Business Combinations and Dispositions

See Note 3 to the unaudited consolidated financial statements for a discussion of our business combinations during the six-month period ended June 30, 2024. We did not have any material dispositions during the six-month period ended June 30, 2024.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to various market risks in our day to day operations. Market risk is the potential loss arising from adverse changes in market rates and prices, such as interest and foreign currency exchange rates and equity prices. The following analyses present the hypothetical loss in fair value of the financial instruments held by us at June 30, 2024 that are sensitive to changes in interest rates. The range of changes in interest rates used in the analyses reflects our view of changes that are reasonably possible over a one‑year period. This discussion of market risks related to our consolidated balance sheet includes estimates of future economic environments caused by changes in market risks. The effect of actual changes in these market risk factors may differ materially from our estimates. In the ordinary course of business, we also face risks that are either nonfinancial or unquantifiable, including credit risk and legal risk. These risks are not included in the following analyses.

Our invested assets are primarily held as cash and cash equivalents, which are subject to various market risk exposures such as interest rate risk. The fair value of our portfolio of cash and cash equivalents at June 30, 2024 approximated its carrying value due to its short‑term duration. We estimated market risk as the potential decrease in fair value resulting from a hypothetical one‑percentage point increase in interest rates for the instruments contained in the cash and cash equivalents investment portfolio. The resulting fair values were not materially different from their carrying values at June 30, 2024.

At June 30, 2024, we had $8,073.0 million of borrowings outstanding under our various senior notes and note purchase agreements. The aggregate estimated fair value of these borrowings at June 30, 2024 was $7,234.8 million due to their long‑term duration and fixed interest rates associated with these debt obligations. No active or observable market exists for our private placement long-term debt. Therefore, the estimated fair value of this debt is based on the income valuation approach, which is a valuation technique that converts future amounts (for example, cash flows or income and expenses) to a single current (that is, discounted) amount. The fair value measurement is determined on the basis of the value indicated by current market expectations about those future amounts. Because our debt issuances generate a measurable income stream for each lender, the income approach was deemed to be an appropriate methodology for valuing the private placement long-term debt. The methodology used calculated the original deal spread at the time of each debt issuance, which was equal to the difference between the yield of each issuance (the coupon rate) and the equivalent benchmark treasury yield at that time. The market spread as of the valuation date was calculated, which is equal to the difference between an index for investment grade insurers and the equivalent benchmark treasury yield today. An implied premium or discount to the par value of each debt issuance based on the difference between the origination deal spread and market as of the valuation date was then calculated. The index we relied on to represent investment graded insurers was the Bloomberg Valuation Services (BVAL) U.S. Insurers BBB index. This index is comprised primarily of insurance brokerage firms and was representative of the industry in which we operate. For the purpose of our analysis, the average BBB rate was assumed to be the appropriate borrowing rate for us.

We estimated market risk as the potential impact on the value of the debt recorded in our consolidated balance sheet based on a hypothetical one‑percentage point decrease in our weighted average borrowing rate at June 30, 2024 and the resulting fair values would have been $192.3 million lower than their carrying value (or $7,880.7 million). We estimated market risk as the potential impact on the value of the debt recorded in our consolidated balance sheet resulting from a hypothetical one‑percentage point increase in our weighted average borrowing rate at June 30, 2024 and the resulting fair values would have been $1,394.4 million lower than their carrying value (or $6,678.6 million).

At June 30, 2024, we had $80.0 million of borrowings outstanding under our Credit Agreement and $207.8 million of borrowings outstanding under our Premium Financing Debt Facility. The fair value of these borrowings approximate their carrying value due to their short‑term duration and variable interest rates associated with these debt obligations. Market risk is estimated as the potential increase in fair value resulting from a hypothetical one‑percentage point decrease in our weighted average short-term borrowing rate at June 30, 2024, and the resulting fair value is not materially different from their carrying value.

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We are subject to foreign currency exchange rate risk primarily from one of our larger U.K. based brokerage subsidiaries that incurs expenses denominated primarily in British pounds while receiving a substantial portion of its revenues in U.S. dollars. Please see Item 1A, “Risk Factors,” in our Annual Report on Form 10-K for the year ended December 31, 2023 for additional information regarding potential foreign exchange rate risks arising from Brexit. In addition, we are subject to foreign currency exchange rate risk from our Australian, Canadian, Indian, Jamaican, New Zealand, Norwegian, Singaporean and various Caribbean and Latin American operations because we transact business in their local denominated currencies. Foreign currency gains (losses) related to this market risk are recorded in earnings before income taxes as transactions occur. Assuming a hypothetical adverse change of 10% in the average foreign currency exchange rate for the six-month period ended June 30, 2024 (a weakening of the U.S. dollar), earnings before income taxes would have increased by approximately $41.1 million. Assuming a hypothetical favorable change of 10% in the average foreign currency exchange rate for the six-month period ended June 30, 2024 (a strengthening of the U.S. dollar), earnings before income taxes would have decreased by approximately $44.3 million. We are also subject to foreign currency exchange rate risk associated with the translation of local currencies of our foreign subsidiaries into U.S. dollars. We manage the balance sheets of our foreign subsidiaries, where practical, such that foreign liabilities are matched with equal foreign assets, maintaining a “balanced book” which minimizes the effects of currency fluctuations. However, our consolidated financial position is exposed to foreign currency exchange risk related to intra-entity loans between our U.S. based subsidiaries and our non-U.S. based subsidiaries that are denominated in the respective local foreign currency. A transaction that is in a foreign currency is first remeasured at the entity’s functional (local) currency, where applicable, (which is an adjustment to consolidated earnings) and then translated to the reporting (U.S. dollar) currency (which is an adjustment to consolidated stockholders’ equity) for consolidated reporting purposes. If the transaction is already denominated in the foreign entity’s functional currency, only the translation to U.S. dollar reporting is necessary. The remeasurement process required by U.S. GAAP for such foreign currency loan transactions will give rise to a consolidated unrealized foreign exchange gain or loss, which could be material, that is recorded in accumulated other comprehensive earnings (loss).

Historically, we have not entered into derivatives or other similar financial instruments for trading or speculative purposes. However, with respect to managing foreign currency exchange rate risk in India, Norway and the U.K., we have periodically purchased financial instruments to minimize our exposure to this risk. During the three-month periods ended June 30, 2024 and 2023, we had several monthly forward contracts and options in place with an external financial institution that are designed to hedge a significant portion of our future Norway and the U.K. currency revenues through various future payment dates. In addition, during the six-month periods ended June 30, 2024 and 2023, we had several monthly put/call options in place with an external financial institution that were designed to hedge a significant portion of our Indian currency disbursements through various future payment dates. Although these hedging strategies were designed to protect us against significant India, Norway and the U.K. currency exchange rate movements, we are still exposed to some foreign currency exchange rate risk for the portion of the payments and currency exchange rate that are unhedged. All of these hedges are accounted for in accordance with ASC Topic 815, “Derivatives and Hedging”, and periodically are tested for effectiveness in accordance with such guidance. In the scenario where such hedge does not pass the effectiveness test, the hedge will be re‑measured at the stated point and the appropriate loss, if applicable, would be recognized. In the six-month period ended June 30, 2024 there has been no such effect on our financial presentation. The impact of these hedging strategies was not material to our unaudited consolidated financial statements for the six-month period ended June 30, 2024. See Note 11 to our unaudited consolidated financial statements for the changes in fair value of these derivative instruments reflected in comprehensive earnings at June 30, 2024.

Item 4. Controls and Procedures

We carried out an evaluation required by the Exchange Act, under the supervision and with the participation of our principal executive officer and principal financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rule 13a-15(e) of the Exchange Act, as of the end of the period covered by this report. Based on this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

During the most recent fiscal quarter, there has not occurred any change in our internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives as specified above. Management does not expect, however, that our disclosure controls and procedures will prevent or detect all errors and fraud. Any control system, no matter how well designed and operated, is based upon certain assumptions and can provide only reasonable, not absolute, assurance that its objectives will be met. Further, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within our company have been detected.

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Part II - Other Information

Item 1. Legal Proceedings

Please see the information set forth in Note 12 to our unaudited consolidated financial statements, included herein, under “Litigation, Regulatory and Taxation Matters.”

Item 1A. Risk Factors

The risk factors described under the heading “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2023 should be considered alongside the information contained in this report.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Issuer Purchases of Equity Securities

The following table shows the purchases of our common stock made by or on behalf of us or any “affiliated purchaser” (as such term is defined in Rule 10b-18(a)(3) under the Securities Exchange Act of 1934, as amended) for each fiscal month in the three-month period ended June 30, 2024:

							Maximum Dollar
							Value of Shares
					Total Number of		that May Yet be
	Total				Shares Purchased		Purchased
	Number of		Average		as Part of Publicly		Under the
	Shares		Price Paid		Announced Plans		Plans or
Period	Purchased (1)		per Share (2)		or Programs (3)		Programs (3) (4)
April 1 through April 30, 2024		22,924	$	244.11		—	$	1,500
May 1 through May 31, 2024		2,219		247.25		—		1,500
June 1 through June 30, 2024		19,298		259.97		—		1,500
Total		44,441	$	251.15		—

(1)Amounts in this column include shares of our common stock purchased by the trustees of trusts established under our Deferred Equity Participation Plan, including sub-plans (which we refer to as the DEPP), our Deferred Cash Participation Plan (which we refer to as the DCPP) and our Supplemental Savings and Thrift Plan (which we refer to as the Supplemental Plan), respectively. These plans are considered to be unfunded for purposes of federal tax law since the assets of these trusts are available to our creditors in the event of our financial insolvency. The DEPP is an unfunded, non-qualified deferred compensation plan that generally provides for distributions to certain of our key executives when they reach age 62 or upon or after their actual retirement. Under sub-plans of the DEPP for certain production staff, the plan generally provides for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65. See Note 9 to the June 30, 2024 unaudited consolidated financial statements in this report for more information regarding the DEPP. The DCPP is an unfunded, non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the terms of the DEPP and the DCPP, we may contribute cash to the trust and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions. In the second quarter of 2024, we instructed the trustee for the DEPP and the DCPP to reinvest dividends on shares of our common stock held by these trusts and to purchase our common stock using cash that we contributed to the DCPP related to 2024 awards under the DCPP. The Supplemental Plan is an unfunded, non-qualified deferred compensation plan that allows certain highly compensated employees to defer compensation, including company match amounts, on a before-tax basis or after‑tax basis. Under the terms of the Supplemental Plan, all amounts credited to an employee’s account may be deemed invested, at the employee’s election, in a number of investment options that include various mutual funds, an annuity product and a fund representing our common stock. When an employee elects to have some or all of the amounts credited to the employee’s account under the Supplemental Plan deemed to be invested in the fund representing our common stock, the trustee of the trust for the Supplemental Plan purchases shares of our common stock in a number sufficient to ensure that the trust holds a number of shares of our common stock with a value equal to all equivalent to the amounts deemed invested in the fund representing our common stock. We want to ensure that at the time when an employee becomes entitled to a distribution under the terms of the Supplemental Plan, any amounts deemed to be invested in the fund representing our common stock are distributed in the form of shares of our common stock held by the trust. We established the trusts for the DEPP, the DCPP and the Supplemental Plan to assist us in discharging our deferred compensation obligations under these plans. All assets of these trusts, including any shares of our common stock purchased by the trustees, remain, at all times, assets of the company, subject

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to the claims of our creditors in the event of our financial insolvency. The terms of the DEPP, the DCPP and the Supplemental Plan do not provide for a specified limit on the number of shares of common stock that may be purchased by the respective trustees of the trusts.

(2)The average price paid per share is calculated on a settlement basis and does not include commissions.

(3)Effective July 28, 2021, the board of directors approved a common stock repurchase plan of up to $1.5 billion of common stock. Repurchases of common stock may be effected from time to time through open market purchases, trading plans established in accordance with the SEC’s rules, accelerated stock repurchases, private transactions or other means, depending on satisfactory market conditions, applicable legal requirements and other factors. The repurchase plan has no expiration date and we are under no commitment or obligation to repurchase any particular amount of our common stock under his plan. At our discretion, we may suspend the repurchase plan at any time.

(4)Dollar values stated in millions.

Item 5. Other Information

During the quarter ended June 30, 2024, no director or officer adopted or terminated any Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement, as each term is defined in Item 408(a) of Regulation S-K.

Item 6. Exhibits

Filed with this Form 10‑Q

3.1	Restated Certificate of Incorporation of Arthur J. Gallagher & Co. (incorporated by reference to Exhibit 3.2 to our Form 8-K Current Report dated May 11, 2023, File No. 1-09761).
3.2	Amended and Restated By-Laws of Arthur J. Gallagher & Co. (incorporated by reference to Exhibit 3.1 to our Form 8-K Current Report dated December 6, 2022, File No. 1-09761).
31.1	Rule 13a-14(a) Certification of Chief Executive Officer.
31.2	Rule 13a-14(a) Certification of Chief Financial Officer.
32.1	Section 1350 Certification of Chief Executive Officer.
32.2	Section 1350 Certification of Chief Financial Officer.
101.INS	Inline 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 with embedded linkbases document.
104	Cover Page Interactive Data File formatted in Inline XBRL (included as Exhibit 101).

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Signature

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

		Arthur J. Gallagher & Co.
Date: July 26, 2024	By:	/s/ Douglas K. Howell
		Douglas K. Howell Vice President and Chief Financial Officer (principal financial officer and duly authorized officer)

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EX-31.1

Exhibit 31.1

Rule 13a-14(a) Certification of Chief Executive Officer

I, J. Patrick Gallagher, Jr., certify that:

1.I have reviewed this quarterly report on Form 10-Q of Arthur J. Gallagher & Co.;

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 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 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: July 26, 2024

/s/ J. Patrick Gallagher, Jr.

J. Patrick Gallagher, Jr.
Chairman and Chief Executive Officer
(principal executive officer)

EX-31.2

Exhibit 31.2

Rule 13a-14(a) Certification of Chief Financial Officer

I, Douglas K. Howell, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Arthur J. Gallagher & Co.;

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 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 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: July 26, 2024

/s/ Douglas K. Howell

Douglas K. Howell
Vice President
Chief Financial Officer
(principal financial officer)

EX-32.1

Exhibit 32.1

Section 1350 Certification of Chief Executive Officer

I, J. Patrick Gallagher, Jr., the chief executive officer of Arthur J. Gallagher & Co., certify that (i) the Quarterly Report on Form 10-Q of Arthur J. Gallagher & Co. for the quarterly period ended June 30, 2024 (the “Form 10‑Q”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Arthur J. Gallagher & Co. and its subsidiaries.

Date: July 26, 2024

/s/ J. Patrick Gallagher, Jr.

J. Patrick Gallagher, Jr.
Chairman and Chief Executive Officer
(principal executive officer)

A signed original of this written statement required by 18 U.S.C. Section 1350 has been provided to Arthur J. Gallagher & Co. and will be retained by Arthur J. Gallagher & Co. and furnished to the Securities Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Section 1350 Certification of Chief Financial Officer

I, Douglas K. Howell, the chief financial officer of Arthur J. Gallagher & Co., certify that (i) the Quarterly Report on Form 10-Q of Arthur J. Gallagher & Co. for the quarterly period ended June 30, 2024 (the “Form 10-Q”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and (ii) the information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Arthur J. Gallagher & Co. and its subsidiaries.

Date: July 26, 2024

/s/ Douglas K. Howell

Douglas K. Howell
Vice President
Chief Financial Officer
(principal financial officer)

A signed original of this written statement required by 18 U.S.C. Section 1350 has been provided to Arthur J. Gallagher & Co. and will be retained by Arthur J. Gallagher & Co. and furnished to the Securities Exchange Commission or its staff upon request.

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Entity Address, City or Town	Rolling Meadows
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60008
City Area Code	630
Local Phone Number	773-3800
Entity Shell Company	false
Trading Symbol	AJG
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, par value $1.00 per share
Entity Common Stock, Shares Outstanding	219,100,000
Document Quarterly Report	true

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Consolidated Statement of Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenues before reimbursements	$ 2,736.0	$ 2,406.9	$ 5,954.1	$ 5,079.8
Reimbursements	39.4	35.0	78.0	68.2
Total revenues	2,775.4	2,441.9	6,032.1	5,148.0
Compensation	1,620.1	1,413.0	3,346.0	2,828.5
Operating	425.6	433.6	861.3	816.1
Reimbursements	39.4	35.0	78.0	68.2
Interest	94.3	77.8	186.5	145.7
Depreciation	40.8	40.8	86.2	78.5
Amortization	170.8	134.9	333.1	256.6
Change in estimated acquisition earnout payables	18.8	9.4	2.7	51.2
Total expenses	2,409.8	2,144.5	4,893.8	4,244.8
Earnings before income taxes	365.6	297.4	1,138.3	903.2
Provision for income taxes	80.2	61.6	240.2	180.8
Net earnings	285.4	235.8	898.1	722.4
Net earnings attributable to noncontrolling interests	2.0	1.3	6.3	1.4
Net earnings attributable to controlling interests	$ 283.4	$ 234.5	$ 891.8	$ 721.0
Basic net earnings per share	$ 1.3	$ 1.09	$ 4.09	$ 3.37
Diluted net earnings per share	1.27	1.07	4.01	3.31
Dividends declared per common share	$ 0.6	$ 0.55	$ 1.2	$ 1.1
Commissions [Member]
Revenues before reimbursements	$ 1,661.8	$ 1,410.4	$ 3,655.4	$ 3,157.8
Broker Fees [Member]
Revenues before reimbursements	827.1	790.5	1,778.3	1,496.2
Supplemental Revenue [Member]
Revenues before reimbursements	88.7	71.2	182.6	152.8
Contingent Revenue [Member]
Revenues before reimbursements	59.8	54.2	145.8	126.0
Investment Income [Member]
Revenues before reimbursements	$ 98.6	$ 80.6	$ 192.0	$ 147.0

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Consolidated Statement of Comprehensive Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 285.4	$ 235.8	$ 898.1	$ 722.4
Change in pension liability, net of taxes	(0.1)	0.7	0.2	1.5
Foreign currency translation, net of taxes	11.3	193.5	(144.5)	226.8
Change in fair value of derivative investments, net of taxes	(1.4)	24.3	(2.8)	29.2
Comprehensive earnings	295.2	454.3	751.0	979.9
Comprehensive earnings attributable to noncontrolling interests	2.1	1.6	6.4	1.6
Comprehensive earnings attributable to controlling interests	$ 293.1	$ 452.7	$ 744.6	$ 978.3

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Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 1,415.3	$ 971.5
Fiduciary assets (includes fiduciary cash of $5,422.5 and $5,571.8 in 2023)	37,316.9	26,907.9
Accounts receivable, net	4,178.3	3,786.6
Other current assets	403.0	450.1
Total current assets	43,313.5	32,116.1
Fixed assets - net	655.3	726.4
Deferred income taxes (includes tax credit carryforwards of $805.1 in 2024 and $867.4 in 2023)	1,040.1	1,132.3
Other noncurrent assets	1,311.6	1,131.8
Right-of-use assets	382.3	400.3
Goodwill	11,915.5	11,475.6
Amortizable intangible assets - net	4,389.4	4,633.3
Total assets	63,007.7	51,615.8
Fiduciary liabilities	37,316.9	26,907.9
Accrued compensation and other current liabilities	3,107.8	2,553.1
Deferred revenue - current	697.1	644.7
Premium financing debt	207.8	289.0
Corporate related borrowings - current	280.0	670.0
Total current liabilities	41,609.6	31,064.7
Corporate related borrowings - noncurrent	7,790.9	7,006.0
Deferred revenue - noncurrent	65.8	61.5
Lease liabilities - noncurrent	335.2	352.2
Other noncurrent liabilities	1,606.9	2,316.1
Total liabilities	51,408.4	40,800.5
Stockholders' equity:
Common stock - issued and outstanding 219.1 shares in 2024 and 216.7 shares in 2023	219.1	216.7
Capital in excess of par value	7,611.4	7,297.8
Retained earnings	4,681.2	4,052.9
Accumulated other comprehensive loss	(939.2)	(792.1)
Stockholders' equity attributable to controlling interests	11,572.5	10,775.3
Stockholders' equity attributable to noncontrolling interests	26.8	40.0
Total stockholders' equity	11,599.3	10,815.3
Total liabilities and stockholders' equity	$ 63,007.7	$ 51,615.8

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Consolidated Balance Sheet (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Fiduciary cash	$ 5,422.5	$ 5,571.8
Deferred income tax credit carryforwards	$ 805.1	$ 867.4
Common stock - issued shares	219.1	216.7
Common stock - outstanding shares	219.1	216.7

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Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net earnings	$ 898.1	$ 722.4
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(1.8)	(4.1)
Depreciation and amortization	419.3	335.1
Change in estimated acquisition earnout payables	2.7	51.2
Amortization of deferred compensation and restricted stock	58.1	48.5
Stock-based and other noncash compensation expense	21.1	11.9
Payments on acquisition earnouts in excess of original estimates	(23.3)	(57.5)
Provision for deferred income taxes	5.6	(0.9)
Effect of changes in foreign exchange rates	0.6	11.0
Net change in accounts receivable, net	(469.2)	(732.3)
Net change in deferred revenue	55.3	78.8
Net change in other current assets	2.7	(29.9)
Net change in accrued compensation and other accrued liabilities	(94.5)	15.0
Net change in income taxes payable	0.6	14.9
Net change in other noncurrent assets and liabilities	33.5	(23.2)
Net cash provided by operating activities	908.8	440.9
Cash flows from investing activities:
Capital expenditures	(61.5)	(88.8)
Cash paid for acquisitions, net of cash and restricted cash acquired	(518.6)	(1,049.5)
Net proceeds from sales of operations/books of business	1.7	4.8
Net funding of investment transactions	0.8	4.5
Net funding of premium finance loans	78.0	63.9
Net cash used by investing activities	(499.6)	(1,065.1)
Cash flows from financing activities:
Payments on acquisition earnouts	(104.4)	(72.5)
Proceeds from issuance of common stock	93.5	66.0
Payments to noncontrolling interests	(4.1)	(1.2)
Dividends paid	(262.0)	(235.9)
Net change in fiduciary assets and liabilities	(103.1)	1,727.0
Net borrowings on premium financing debt facility	(73.1)	(53.2)
Borrowings on line of credit facility	1,663.2	2,125.0
Repayments on line of credit facility	(1,826.9)	(1,690.0)
Net borrowings of corporate related long-term debt	567.5	643.7
Debt acquisition costs	(8.4)	(8.6)
Settlements on terminated interest rate swaps	(1.4)	60.0
Net cash (used) provided by financing activities	(59.2)	2,560.3
Effect of changes in foreign exchange rates on cash, cash equivalents, restricted cash and fiduciary cash	(55.5)	41.9
Net increase in cash, cash equivalents, restricted cash and fiduciary cash	294.5	1,978.0
Cash, cash equivalents, restricted cash and fiduciary cash at beginning of period	6,543.3	4,964.2
Cash, cash equivalents, restricted cash and fiduciary cash at end of period	$ 6,837.8	$ 6,942.2

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Consolidated Statement of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
Beginning balance at Dec. 31, 2022	$ 9,190.2	$ 211.9	$ 6,509.9	$ 3,562.2	$ (1,140.4)	$ 46.6
Beginning balance (in shares) at Dec. 31, 2022		211.9
Net earnings	486.6			486.5		0.1
Net purchase of subsidiary shares from noncontrolling interests	(5.4)					(5.4)
Dividends paid to noncontrolling interests	(0.7)					(0.7)
Net change in pension asset/liability, net of taxes	0.8				0.8
Foreign currency translation	33.2				33.3	(0.1)
Change in fair value of derivative instruments, net of taxes	4.9				4.9
Compensation expense related to stock option plan grants	7.7		7.7
Common stock issued in: purchase transactions	186.5	$ 1.0	185.5
Common stock issued in: purchase transactions (in shares)		1.0
Stock option plans	21.2	$ 0.5	20.7
Stock option plans (in shares)		0.5
Employee stock purchase plan	9.1	$ 0.1	9.0
Employee stock purchase plan (in shares)		0.1
Shares issued to benefit plans	84.6	$ 0.4	84.2
Shares issued to benefit plans (in shares)		0.4
Deferred compensation and restricted stock	(41.9)	$ 0.3	(42.2)
Deferred compensation and restricted (in shares)		0.3
Cash dividends declared on common stock	(118.5)			(118.5)
Ending balance at Mar. 31, 2023	9,858.3	$ 214.2	6,774.8	3,930.2	(1,101.4)	40.5
Ending balance, (in shares) at Mar. 31, 2023		214.2
Beginning balance at Dec. 31, 2022	9,190.2	$ 211.9	6,509.9	3,562.2	(1,140.4)	46.6
Beginning balance (in shares) at Dec. 31, 2022		211.9
Net earnings	722.4
Net change in pension asset/liability, net of taxes	1.5
Change in fair value of derivative instruments, net of taxes	29.2
Compensation expense related to stock option plan grants	15.5
Ending balance at Jun. 30, 2023	10,440.0	$ 215.5	7,018.0	4,045.1	(882.9)	44.3
Ending balance, (in shares) at Jun. 30, 2023		215.5
Beginning balance at Mar. 31, 2023	9,858.3	$ 214.2	6,774.8	3,930.2	(1,101.4)	40.5
Beginning balance (in shares) at Mar. 31, 2023		214.2
Net earnings	235.8			234.5		1.3
Net purchase of subsidiary shares from noncontrolling interests	2.7					2.7
Dividends paid to noncontrolling interests	(0.5)					(0.5)
Net change in pension asset/liability, net of taxes	0.7				0.7
Foreign currency translation	193.8				193.5	0.3
Change in fair value of derivative instruments, net of taxes	24.3				24.3
Compensation expense related to stock option plan grants	7.8		7.8
Common stock issued in: purchase transactions	178.6	$ 0.8	177.8
Common stock issued in: purchase transactions (in shares)		0.8
Stock option plans	22.8	$ 0.4	22.4
Stock option plans (in shares)		0.4
Employee stock purchase plan	13.0	$ 0.1	12.9
Employee stock purchase plan (in shares)		0.1
Deferred compensation and restricted stock	22.3		22.3
Cash dividends declared on common stock	(119.6)			(119.6)
Ending balance at Jun. 30, 2023	10,440.0	$ 215.5	7,018.0	4,045.1	(882.9)	44.3
Ending balance, (in shares) at Jun. 30, 2023		215.5
Beginning balance at Dec. 31, 2023	$ 10,815.3	$ 216.7	7,297.8	4,052.9	(792.1)	40.0
Beginning balance (in shares) at Dec. 31, 2023	216.7	216.7
Net earnings	$ 612.7			608.4		4.3
Net purchase of subsidiary shares from noncontrolling interests	(0.3)					(0.3)
Dividends paid to noncontrolling interests	(0.6)					(0.6)
Net change in pension asset/liability, net of taxes	0.3				0.3
Foreign currency translation	(155.8)				(155.8)
Change in fair value of derivative instruments, net of taxes	(1.4)				(1.4)
Compensation expense related to stock option plan grants	15.1		15.1
Common stock issued in: purchase transactions	88.3	$ 0.4	87.9
Common stock issued in: purchase transactions (in shares)		0.4
Stock option plans	39.9	$ 0.6	39.3
Stock option plans (in shares)		0.6
Employee stock purchase plan	12.2	$ 0.1	12.1
Employee stock purchase plan (in shares)		0.1
Shares issued to benefit plans	98.5	$ 0.4	98.1
Shares issued to benefit plans (in shares)		0.4
Deferred compensation and restricted stock	(48.0)	$ 0.3	(48.3)
Deferred compensation and restricted (in shares)		0.3
Cash dividends declared on common stock	(132.0)			(132.0)
Ending balance at Mar. 31, 2024	11,344.2	$ 218.5	7,502.0	4,529.3	(949.0)	43.4
Ending balance, (in shares) at Mar. 31, 2024		218.5
Beginning balance at Dec. 31, 2023	$ 10,815.3	$ 216.7	7,297.8	4,052.9	(792.1)	40.0
Beginning balance (in shares) at Dec. 31, 2023	216.7	216.7
Net earnings	$ 898.1
Net change in pension asset/liability, net of taxes	0.2
Change in fair value of derivative instruments, net of taxes	(2.8)
Compensation expense related to stock option plan grants	$ 25.6
Stock option plans (in shares)	1.0
Ending balance at Jun. 30, 2024	$ 11,599.3	$ 219.1	7,611.4	4,681.2	(939.2)	26.8
Ending balance, (in shares) at Jun. 30, 2024	219.1	219.1
Beginning balance at Mar. 31, 2024	$ 11,344.2	$ 218.5	7,502.0	4,529.3	(949.0)	43.4
Beginning balance (in shares) at Mar. 31, 2024		218.5
Net earnings	285.4			283.4		2.0
Net purchase of subsidiary shares from noncontrolling interests	(18.4)					(18.4)
Dividends paid to noncontrolling interests	(0.3)					(0.3)
Net change in pension asset/liability, net of taxes	(0.1)				(0.1)
Foreign currency translation	11.4				11.3	0.1
Change in fair value of derivative instruments, net of taxes	(1.4)				(1.4)
Compensation expense related to stock option plan grants	10.5		10.5
Common stock issued in: purchase transactions	45.5	$ 0.2	45.3
Common stock issued in: purchase transactions (in shares)		0.2
Stock option plans	24.8	$ 0.3	24.5
Stock option plans (in shares)		0.3
Employee stock purchase plan	16.5		16.5
Deferred compensation and restricted stock	12.7	$ 0.1	12.6
Deferred compensation and restricted (in shares)		0.1
Cash dividends declared on common stock	(131.5)			(131.5)
Ending balance at Jun. 30, 2024	$ 11,599.3	$ 219.1	$ 7,611.4	$ 4,681.2	$ (939.2)	$ 26.8
Ending balance, (in shares) at Jun. 30, 2024	219.1	219.1

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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Tax effect on net change in pension asset/liability	$ 0.0	$ 0.1	$ 0.2	$ 0.2
Net change in fair value of derivative instruments, tax	$ (0.5)	$ (0.4)	$ 8.4	$ 1.3

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Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ 283.4	$ 234.5	$ 891.8	$ 721.0

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Insider Trading Arrangements	3 Months Ended
	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

1. Summary of Significant Accounting Policies

Terms Used in Notes to Consolidated Financial Statements

ASC - Accounting Standards Codification.

ASU - Accounting Standards Update.

FASB - The Financial Accounting Standards Board.

GAAP - U.S. generally accepted accounting principles.

IRC - Internal Revenue Code.

IRS - Internal Revenue Service.

Underwriting enterprises - Insurance companies, reinsurance companies and various other forms of risk-taking entities, including intermediaries of underwriting enterprises.

Nature of Operations and Basis of Presentation

Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us, Gallagher or the company, provide insurance and reinsurance brokerage, consulting and third party claims settlement and administration services to both domestic and international entities. We have three reportable segments: brokerage, risk management and corporate. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients.

Our brokerage segment operations provide brokerage and consulting services to entities of all types, including commercial, nonprofit, public sector entities, and, to a lesser extent, individuals, in the areas of insurance and reinsurance placements, risk of loss management, and management of employer sponsored benefit programs. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third‑party claims management organization rather than the claim services provided by underwriting enterprises. The corporate segment reports the financial information related to our debt and other corporate costs, clean energy investments, external acquisition‑related expenses and the impact of foreign currency translation.

We do not assume insurance underwriting risk on a net basis, other than with respect to de minimis amounts necessary to provide minimum or regulatory capital to organize captives, pools, specialized underwriters or risk-retention groups. Rather, capital necessary for covering losses is provided by underwriting enterprises.

Interest income, premium finance revenues and other income are primarily generated from our premium financing operations, our invested cash and restricted cash we hold on behalf of our clients, as well as clean energy investments. In addition, our share of the net earnings related to partially owned entities that are accounted for using the equity method is included in other income.

We are a global insurance brokerage, risk management and consulting services firm, headquartered in Rolling Meadows, Illinois. We provide these services in approximately 130 countries around the world through our owned operations and a network of correspondent brokers and consultants. We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in annual financial statements have been omitted pursuant to such rules and regulations. The unaudited consolidated financial statements included herein are, in the opinion of management, prepared on a basis consistent with our audited consolidated financial statements for the year ended December 31, 2023, and include all normal recurring adjustments necessary for a fair presentation of the information set forth herein. The quarterly results of operations are not necessarily indicative of the results of operations to be reported for subsequent quarters or the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. In the preparation of our unaudited consolidated financial statements as of June 30, 2024, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued, for potential recognition and/or disclosure therein.

Use of Estimates

The preparation of our unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our unaudited consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in the notes herein.

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Effect of New Accounting Pronouncements

6 Months Ended

Jun. 30, 2024

Accounting Changes and Error Corrections [Abstract]

Effect of New Accounting Pronouncements

2. Effect of New Accounting Pronouncements

Segment Reporting

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires that an entity report segment information in accordance with Topic 280, Segment Reporting. The amendment in the ASU is intended to improve reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. We are currently evaluating the impact of the new standard on our consolidated financial statements which is expected to result in enhanced disclosures.

Income Taxes

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires that an entity, on an annual basis, disclose additional income tax information, primarily related to the rate reconciliation and income taxes paid. The amendment in the ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. The amendments in this update are effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact of the new standard on our consolidated financial statements which is expected to result in enhanced disclosures.

Climate Risk Disclosures

In March 2024, the SEC issued final climate-related disclosure rules that will require disclosure of material climate-related risks and material direct greenhouse gas emissions from operations owned or controlled (Scope 1) and/or material indirect greenhouse gas emissions from purchased energy consumed in owned or controlled operations (Scope 2). Additionally, the rules require disclosure in the notes to the financial statements of the effects of severe weather events and other natural conditions, subject to certain materiality thresholds. The disclosure requirements were scheduled to begin phasing in for annual reports and registration statements including financial information with respect to annual periods beginning in calendar year 2025. On April 4, 2024, the SEC issued an order staying the rules during the pendency of a number of legal challenges to the rules’ validity. We are continuing to monitor these developments while evaluating the impact of the rules on our consolidated financial statements, which are expected to result in additional disclosures.

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Business Combinations

6 Months Ended

Jun. 30, 2024

Business Combinations [Abstract]

Business Combinations

3. Business Combinations

During the six-month period ended June 30, 2024, we acquired substantially all of the ownership interest or net assets, as applicable, of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data):

													Total		Maximum
	Common		Common								Recorded		Recorded		Potential
Name and Effective	Shares		Share				Accrued		Escrow		Earnout		Purchase		Earnout
Date of Acquisition	Issued		Value		Cash Paid		Liability		Deposited		Payable		Price		Payable
	(000s)
Ericson Insurance Services, LLC    January 1, 2024 (EIS)		129	$	30.1	$	26.5	$	—	$	3.0	$	7.0	$	66.6	$	10.0
The Rowley Agency, LLC    January 1, 2024 (TRA)		—		—		117.2		—		11.0		—		128.2		—
OperationsInc, LLC    June 1, 2024 (OPR)		—	$	—	$	52.6	$	—	$	2.8	$	11.0	$	66.4	$	20.0
Twenty-one other acquisitions    completed in 2024		229		48.8		271.3		2.6		16.8		53.3		392.8		108.5
		358	$	78.9	$	467.6	$	2.6	$	33.6	$	71.3	$	654.0	$	138.5

Common shares issued in connection with acquisitions are valued at closing market prices as of the effective date of the applicable acquisition or on the days when the shares are issued, if purchase consideration is deferred. We record escrow deposits that are returned to us as a result of adjustments to net assets acquired as reductions of goodwill when the escrows are settled. The maximum potential earnout payables disclosed in the foregoing table represent the maximum amount of additional consideration that could be paid pursuant to the terms of the purchase agreement for the applicable acquisition. The amounts recorded as earnout payables, which are primarily based upon the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date, are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration in the foregoing table. We will record subsequent changes in these estimated earnout obligations, including the accretion of discount, in our consolidated statement of earnings when incurred.

The fair value of these earnout obligations is generally based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements, which is a Level 3 fair value measurement (discounted cash flow method of the income approach). In determining fair value, we estimated the acquired entity’s future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. Revenue growth rates generally ranged from 5.0% to 15.0% for our 2024 acquisitions. We estimated future payments using the earnout formula and performance targets specified in each purchase agreement and the financial projections just described. We then discounted these payments to present value using a risk-adjusted rate that takes into consideration market-based rates of return that reflect the ability of the acquired entity to achieve the targets. The discount rate was 9.0% for all of our 2024 acquisitions. In some instances, the fair value of these earnout obligations can be based on other valuation methods including the Black-Scholes Option Pricing Method or Monte Carlo Simulation method. Changes in financial projections, market participant assumptions for revenue growth and/or profitability, or the risk-adjusted discount rate, would result in a change in the fair value of recorded earnout obligations.

During the three-month periods ended June 30, 2024 and 2023, we recognized $15.0 million and $19.8 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. During the six-month periods ended June 30, 2024 and 2023, we recognized $33.8 million and $39.6 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. In addition, during the three-month periods ended June 30, 2024 and 2023, we recognized $3.8 million of expense and $10.4 million of income, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 30 and 34 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2024 and 2023, we recognized $31.1 million of income and $11.6 million of expense, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised assumptions due to changes in interest rates, volatility and other assumptions and projections of future performance for 58 and 45 acquisitions, respectively. The net adjustments in the three‑month period ended June 30, 2024, include changes made to the estimated fair value of the Willis Re acquisition earnout and reflect updated assumptions as of June 30, 2024. The aggregate amount of maximum earnout obligations related to acquisitions was $1,925.8 million as of June 30, 2024, of which $1,236.7 million was recorded in the consolidated balance sheet as of June 30, 2024, based on the estimated fair value of the expected future payments to be made, of which approximately $491.8 million can be settled in cash or stock at our option and $744.9 million must be settled in cash.

The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in the six-month period ended June 30, 2024 (in millions):

							Twenty-one Other
	EIS		TRA		OPR		Acquisitions		Total
Cash and cash equivalents	$	0.1	$	4.1	$	0.8	$	9.9	$	14.9
Fiduciary assets		1.0		2.6		—		34.1		37.7
Other current assets		3.5		0.5		2.7		11.3		18.0
Fixed assets		—		0.4		—		0.7		1.1
Noncurrent assets		0.1		1.7		2.0		3.8		7.6
Goodwill		27.4		65.8		41.9		205.9		341.0
Expiration lists		35.9		57.4		22.1		185.5		300.9
Non-compete agreements		0.5		0.6		0.2		6.2		7.5
Trade names		—		—		—		0.3		0.3
Total assets acquired		68.5		133.1		69.7		457.7		729.0
Fiduciary liabilities		1.0		2.6		—		34.1		37.7
Current liabilities		0.8		0.6		1.1		14.7		17.2
Noncurrent liabilities		0.1		1.7		2.2		16.1		20.1
Total liabilities assumed		1.9		4.9		3.3		64.9		75.0
Total net assets acquired	$	66.6	$	128.2	$	66.4	$	392.8	$	654.0

Among other things, these acquisitions allow us to expand into desirable geographic locations, further extend our presence in the retail and wholesale insurance and reinsurance brokerage markets and increase the volume of general services currently provided. The excess of the purchase price over the estimated fair value of the tangible net assets acquired at the acquisition date was allocated to goodwill, expiration lists, non-compete agreements and trade names in the amounts of $341.0 million, $300.9 million, $7.5 million and $0.3 million, respectively, within the brokerage segment.

Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments. During this period, we may use independent third-party valuation specialists to assist us in finalizing the fair value of assets acquired and liabilities assumed. Fair value adjustments, if any, are most common to the values established for amortizable intangible assets, including expiration lists, non‑compete agreements and trade names, as well as for acquired software, and earnout liabilities, with the offset to goodwill, net of any income tax effect. Provisional estimates of fair value were used by us to initially record four acquisitions as of their acquisition date that were completed in the fourth quarter of 2023. We subsequently used independent third party valuation specialists to assist us in determining the fair value of assets acquired and liabilities assumed for these transactions, the valuations of which were completed in the three-month period ended June 30, 2024. Based on these valuations, we made adjustments to the amounts initially recorded for earnout liabilities, expiration lists, non-competes agreements, trade names and acquired software, which resulted in a net increase to goodwill of $256.7 million.

The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values. In general, the fair value of expiration lists was established using the excess earnings method, which is an income approach based on estimated financial projections developed by management for each acquired entity using market participant assumptions. Revenue growth and attrition rates generally ranged from 0.7% to 5.3% and 5.0% to 11.0%, respectively, for our 2023 acquisitions for which valuations were performed in 2024. We estimate the fair value as the present value of the benefits anticipated from ownership of the subject expiration list in excess of returns required on the investment in contributory assets necessary to realize those benefits. The rate used to discount the net benefits was based on a risk-adjusted rate that takes into consideration market-based rates of return and reflects the risk of the asset relative to the acquired business. The discount rates ranged from 9.5% to 11.0% for our 2023 acquisitions for which valuations were performed in 2024. The fair value of non-compete agreements was established using the profit differential method, which is an income approach based on estimated financial projections developed by management for the acquired company using market participant assumptions and various non-compete scenarios.

Expiration lists, non-compete agreements and trade names related to our acquisitions are amortized using the straight-line method over their estimated useful lives (two to fifteen years for expiration lists, two to six years for non-compete agreements and two to fifteen years for trade names), while goodwill is not subject to amortization. We use the straight-line method to amortize these intangible assets because the pattern of their economic benefits cannot be reasonably determined with any certainty. We review all of our identifiable intangible assets for impairment periodically (at least annually) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. In reviewing identifiable intangible assets, if the undiscounted future cash flows were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2024 we wrote off $14.0 million of amortizable assets related to the brokerage segment. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2023, we wrote off $3.1 million and $3.2 million, respectively, of amortizable assets related to the brokerage and risk management segments.

Of the $300.9 million of expiration lists, $7.5 million of non-compete agreements and $0.3 million of trade names related to our acquisitions made during the six-month period ended June 30, 2024, $52.1 million, $4.1 million and $0.3 million, respectively, are not expected to be deductible for income tax purposes. Accordingly, we recorded a deferred tax liability of $13.1 million and a corresponding amount of goodwill in the six-month period ended June 30, 2024, related to the nondeductible amortizable intangible assets.

Our unaudited consolidated financial statements for the six-month period ended June 30, 2024 include the operations of the entities acquired in the six-month period ended June 30, 2024 from their respective acquisition dates. The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2023 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Total revenues	$	2,785.4	$	2,478.5	$	6,061.9	$	5,223.0
Net earnings attributable to controlling interests		283.9		235.8		893.7		724.9
Basic net earnings per share		1.30		1.10		4.10		3.38
Diluted net earnings per share		1.27		1.07		4.02		3.32

The unaudited pro forma results above have been prepared for comparative purposes only and do not purport to be indicative of the results of operations which actually would have resulted had these acquisitions occurred at January 1, 2023, nor are they necessarily indicative of future operating results. Annualized revenues of entities acquired during the six-month period ended June 30, 2024 totaled approximately $141.2 million. For the six-month period ended June 30, 2024, total revenues, net pre-tax loss and net earnings before interest, income taxes, depreciation, amortization and the change in estimated acquisition earnout payables (EBITDAC)

recorded in our unaudited consolidated statement of earnings related to our acquisitions made during the six-month period ended June 30, 2024 in the aggregate, were $42.8 million, $(5.0) million and $7.4 million, respectively.

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Contracts with Customers

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Contracts with Customers

4. Contracts with Customers

Contract Assets and Liabilities/Contract Balances

Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions):

	June 30, 2024		December 31, 2023
Unbilled receivables	$	1,536.6	$	1,093.7
Deferred contract costs		123.0		169.1
Deferred revenue		762.9		706.2

The unbilled receivables, which are included in accounts receivable in our consolidated balance sheet, primarily relate to our rights to consideration for work completed but not billed at the reporting date. These are transferred to the receivables when the client is billed. The deferred contract costs represent the costs we incur to fulfill a new or renewal contract with our clients prior to the effective date of the contract. These costs are expensed on the contract effective date. The deferred revenue in the consolidated balance sheet includes amounts that represent the remaining performance obligations under our contracts and amounts collected related to advanced billings and deposits received from customers that may or may not ultimately be recognized as revenues in the future. Deposits received from customers could be returned to the customers based on lesser actual transactional volume than originally billed volume.

Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions):

				Risk
	Brokerage			Management			Total
Deferred revenue at December 31, 2023	$	533.6		$	172.6		$	706.2
Incremental deferred revenue		417.5			45.5			463.0
Revenue recognized during the six-month period ended   June 30, 2024 included in deferred revenue at December 31, 2023		(343.5	)		(42.1	)		(385.6	)
Net change in collected billings/deposits received from customers		(22.8	)		(0.9	)		(23.7	)
Impact of change in foreign exchange rates		(2.2	)		(0.1	)		(2.3	)
Deferred revenue recognized from business acquisitions		5.3			—			5.3
Deferred revenue at June 30, 2024	$	587.9		$	175.0		$	762.9

Revenue recognized during the six-month period ended June 30, 2024 in the table above included revenue from 2023 acquisitions that would not be reflected in prior periods.

Remaining Performance Obligations

Remaining performance obligations represent the portion of the contract price for which work has not been performed. As of June 30, 2024, the aggregate amount of the contract price allocated to remaining performance obligations was $762.9 million. The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions):

	Brokerage		Risk Management		Total
2024 (remaining six months)	$	504.9	$	86.4	$	591.3
2025		64.2		38.9		103.1
2026		16.8		17.4		34.2
2027		1.0		13.0		14.0
2028		0.5		6.8		7.3
Thereafter		0.5		12.5		13.0
Total	$	587.9	$	175.0	$	762.9

Deferred Contract Costs

We capitalize costs incurred to fulfill contracts as deferred contract costs which are included in other current assets in our consolidated balance sheet. Deferred contract costs were $123.0 million and $169.1 million as of June 30, 2024 and December 31, 2023, respectively. Capitalized fulfillment costs are amortized to expense on the contract effective date. The amount of amortization of the deferred contract costs was $362.9 million and $306.7 million for the six-month periods ended June 30, 2024 and 2023, respectively.

We have applied the practical expedient to recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less for our brokerage segment. These costs are included in compensation and operating expenses in our consolidated statement of earnings.

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Intangible Assets

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

5. Intangible Assets

The carrying amount of goodwill at June 30, 2024 and December 31, 2023 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2024
United States	$	6,651.7	$	74.8	$	—	$	6,726.5
United Kingdom		2,503.1		18.4		—		2,521.5
Canada		606.8		—		—		606.8
Australia		522.6		234.5		—		757.1
New Zealand		197.0		9.2		—		206.2
Other foreign		1,078.5		—		18.9		1,097.4
Total goodwill	$	11,559.7	$	336.9	$	18.9	$	11,915.5
At December 31, 2023
United States	$	6,304.5	$	74.8	$	—	$	6,379.3
United Kingdom		2,493.4		18.5		—		2,511.9
Canada		623.7		—		—		623.7
Australia		514.6		135.9		—		650.5
New Zealand		204.2		9.6		—		213.8
Other foreign		1,077.4		—		19.0		1,096.4
Total goodwill	$	11,217.8	$	238.8	$	19.0	$	11,475.6

The changes in the carrying amount of goodwill for the six-month period ended June 30, 2024 are as follows (in millions):

	Brokerage			Risk Management			Corporate			Total
Balance as of December 31, 2023	$	11,217.8		$	238.8		$	19.0		$	11,475.6
Goodwill acquired during the period		341.0			—			—			341.0
Goodwill true-ups due to appraisals and other acquisition    adjustments (see Note 3)		94.4			102.0			—			196.4
Goodwill written-off related to sales of business and impairment		(5.8	)		—			—			(5.8	)
Foreign currency translation adjustments during the period		(87.7	)		(3.9	)		(0.1	)		(91.7	)
Balance as of June 30, 2024	$	11,559.7		$	336.9		$	18.9		$	11,915.5

Major classes of amortizable intangible assets at June 30, 2024 and December 31, 2023 consist of the following (in millions):

	June 30,			December 31,
	2024			2023
Expiration lists	$	8,341.8		$	8,222.8
Accumulated amortization - expiration lists		(4,025.8	)		(3,733.2	)
		4,316.0			4,489.6
Non-compete agreements		103.3			112.2
Accumulated amortization - non-compete agreements		(79.9	)		(74.9	)
		23.4			37.3
Trade names		119.7			171.8
Accumulated amortization - trade names		(69.7	)		(65.4	)
		50.0			106.4
Net amortizable assets	$	4,389.4		$	4,633.3

Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):

2024 (remaining six months)	$	310.1
2025		587.5
2026		544.3
2027		510.5
2028		470.1
Thereafter		1,966.9
Total	$	4,389.4

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Credit and Other Debt Agreements

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Credit and Other Debt Agreements

6. Credit and Other Debt Agreements

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2024			2023
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.40%, balloon due November 9, 2031	$	400.0		$	400.0
Semi-annual payments of interest, fixed rate of 5.50%, balloon due March 2, 2033		350.0			350.0
Semi-annual payments of interest, fixed rate of 6.50%, balloon due February 15, 2034		400.0			400.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due July 15, 2034		500.0			—
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			850.0
Semi-annual payments of interest, fixed rate of 3.05%, balloon due March 9, 2052		350.0			350.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due March 2, 2053		600.0			600.0
Semi-annual payments of interest, fixed rate of 6.75%, balloon due February 15, 2054		600.0			600.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due July 15, 2054		500.0			—
Total Senior Notes		4,550.0			3,550.0
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		—			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		—			325.0
Semi-annual payments of interest, fixed rate of 4.31%, balloon due June 24, 2025		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.85%, balloon due February 13, 2026		140.0			140.0
Semi-annual payments of interest, fixed rate of 4.73%, balloon due February 27, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.40%, balloon due June 2, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.36%, balloon due June 24, 2026		150.0			150.0
Semi-annual payments of interest, fixed rate of 3.75%, balloon due January 30, 2027		30.0			30.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due June 27, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due August 2, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.14%, balloon due August 4, 2027		98.0			98.0
Semi-annual payments of interest, fixed rate of 3.46%, balloon due December 1, 2027		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.55%, balloon due June 2, 2028		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 13, 2028		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.04%, balloon due February 13, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.98%, balloon due February 27, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due June 27, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due August 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.48%, balloon due December 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.99%, balloon due January 30, 2030		341.0			341.0
Semi-annual payments of interest, fixed rate of 4.44%, balloon due June 13, 2030		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.14%, balloon due March 13, 2031		180.0			180.0
Semi-annual payments of interest, fixed rate of 4.70%, balloon due June 2, 2031		25.0			25.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due January 30, 2032		69.0			69.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 27, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due August 2, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.59%, balloon due June 13, 2033		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.29%, balloon due March 13, 2034		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.48%, balloon due June 12, 2034		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.24%, balloon due January 30, 2035		79.0			79.0
Semi-annual payments of interest, fixed rate of 2.44%, balloon due February 10, 2036		100.0			100.0
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.69%, balloon due June 13, 2038		75.0			75.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due March 13, 2039		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.49%, balloon due January 30, 2040		56.0			56.0
Total Note Purchase Agreements		3,523.0			3,948.0
Credit Agreement:
Periodic payments of interest and principal, prime or SOFR plus up    to 1.075%, expires June 22, 2028		80.0			245.0
Premium Financing Debt Facility - expires October 31, 2025:
Facility B
AUD denominated tranche, interbank rates plus 1.500%		199.6			249.0
NZD denominated tranche, interbank rates plus 1.850%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.830%		—			31.4
NZD denominated tranche, interbank rates plus 0.990%		8.2			8.6
Total Premium Financing Debt Facility		207.8			289.0
Total corporate and other debt		8,360.8			8,032.0
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(46.8	)		(38.4	)
Less unamortized discount on Bonds Payable		(35.3	)		(28.6	)
Net corporate and other debt	$	8,278.7		$	7,965.0

Senior Notes - On February 12, 2024, we closed and funded an offering of $1,000.0 million of unsecured senior notes in two tranches. The $500.0 million aggregate principal amount of 5.45% Senior Notes is due in 2034 (which we refer to as the 2034 July Notes) and $500.0 million aggregate principal amount of 5.75% Senior Notes is due in 2054 (which we refer to as the 2054 July Notes). The weighted average interest rate is 5.71% per annum after giving effect to underwriting costs and a net hedge loss. During 2023, we

entered into a pre-issuance interest rate hedging transaction related to these notes. We realized a net cash loss of approximately $1.4 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over ten years. We used the proceeds of these offerings to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.

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Earnings Per Share

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Earnings Per Share

7. Earnings Per Share

The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Net earnings attributable to controlling interests	$	283.4	$	234.5	$	891.8	$	721.0
Weighted average number of common shares outstanding		218.8		214.9		218.1		213.8
Dilutive effect of stock options using the treasury    stock method		4.1		4.1		4.3		4.2
Weighted average number of common and common    equivalent shares outstanding		222.9		219.0		222.4		218.0
Basic net earnings per share	$	1.30	$	1.09	$	4.09	$	3.37
Diluted net earnings per share	$	1.27	$	1.07	$	4.01	$	3.31

Anti-dilutive stock-based awards of 1.0 million and 1.1 million shares were outstanding at the three-month periods ended June 30, 2024 and 2023, respectively, which were excluded in the computation of the dilutive effect of stock-based awards for the three-month periods then ended. Anti-dilutive stock-based awards of 0.7 million shares were outstanding at each the six-month periods ended June 30, 2024 and 2023, which were excluded in the computation of the dilutive effect of stock-based awards for the six-month periods then ended. These stock‑based awards were excluded from the computation because the exercise prices on these stock‑based awards were greater than the average market price of our common shares during the respective period, and therefore, would be anti‑dilutive to earnings per share under the treasury stock method.

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Stock Option Plans

6 Months Ended

Jun. 30, 2024

Text Block [Abstract]

Stock Option Plans

8. Stock Option Plans

On May 10, 2022, our stockholders approved the Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (which we refer to as the 2017 LTIP). The LTIP term began May 10, 2022 and terminates on the date of the annual meeting of stockholders in 2032, unless terminated earlier by our board of directors. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. The compensation committee of our board of directors determines the annual number of shares delivered under the LTIP. The LTIP provides for non-qualified and incentive stock options, stock appreciation rights, restricted stock and restricted stock units, any or all of which may be made contingent upon the achievement of performance criteria.

Shares of our common stock available for issuance under the LTIP include authorized and unissued shares of common stock or authorized and issued shares of common stock reacquired and held as treasury shares or otherwise, or a combination thereof. The number of available shares will be reduced by the aggregate number of shares that become subject to outstanding awards granted under the LTIP. A maximum of 3.5 million shares issued for full value awards (i.e., awards other than stock options or stock appreciation rights) will be counted one-for-one against the 13.5 million share pool, and every share subject to a full value award in excess of such limit will count as 3.8 shares against the pool. To the extent that shares subject to an outstanding award granted under either the LTIP or prior equity plans are not issued or delivered by reason of the expiration, termination, cancellation or forfeiture of such award or by reason of the settlement of such award in cash, then such shares will again be available for grant under the LTIP.

The maximum number of shares available under the LTIP for restricted stock, restricted stock unit awards and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) was 2.5 million at June 30, 2024.

The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non-qualified stock options and stock appreciation rights. The compensation committee determines the period for the exercise of a non-qualified stock option, tax-qualified incentive stock option or stock appreciation right, provided that no option can be exercised later than seven years after its date of grant. The exercise price of a non-qualified stock option or tax-qualified incentive stock option and the base price of a stock appreciation right cannot be less than 100% of the fair market value of a share of our common stock on the date of grant,

provided that the base price of a stock appreciation right granted in tandem with an option will be the exercise price of the related option.

Upon exercise, the option exercise price may be paid in cash, by the delivery of previously owned shares of our common stock, through a net-exercise arrangement, or through a broker-assisted cashless exercise arrangement. The compensation committee determines all of the terms relating to the exercise, cancellation or other disposition of an option or stock appreciation right upon a termination of employment, whether by reason of disability, retirement, death or any other reason. Stock option and stock appreciation right awards under the LTIP are non-transferable.

On March 1, 2024, the compensation committee granted 1,044,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2027, 2028 and 2029, respectively. On March 15, 2023, the compensation committee granted 1,131,000 options under the LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2026, 2027 and 2028, respectively. The 2024 and 2023 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment. Stock options granted in 2023 to certain executive officers age 55 or older are not subject to forfeiture upon such officers' departure from the company after two years from date of grant. Stock options granted in 2024 to executive officers are not subject to forfeiture upon such officers’ departure from the company once they attain the age of 62.

During the three-month periods ended June 30, 2024 and 2023, we recognized $10.5 million and $7.8 million, respectively, of compensation expense related to our stock option grants. During the six-month periods ended June 30, 2024 and 2023, we recognized $25.6 million and $15.5 million, respectively, of compensation expense related to our stock option grants.

For purposes of expense recognition, the estimated fair values of the stock option grants are amortized to expense over the options’ vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	2024			2023
Expected dividend yield		1.0	%		1.2	%
Expected risk-free interest rate		4.2	%		3.6	%
Volatility		25.3	%		25.0	%
Expected life (in years)		5.5			5.4

Option valuation models require the input of highly subjective assumptions including the expected stock price volatility. The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. The weighted average fair value per option for all options granted during the six-month periods ended June 30, 2024 and 2023, as determined on the grant date using the Black-Scholes option pricing model, was $69.55 and $46.48, respectively.

The following is a summary of our stock option activity and related information for 2024 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2024
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.9		$	123.85
Granted		1.0			243.54
Exercised		(1.0	)		76.40
Forfeited or canceled		(0.1	)		151.05
Ending balance		7.8		$	145.70		4.18	$	883.9
Exercisable at end of period		2.1		$	88.79		2.19	$	353.9
Ending unvested and expected to vest		5.2		$	164.50		4.86	$	494.1

Options with respect to 10.9 million shares (less any shares of restricted stock issued under the LTIP - see Note 10 to these unaudited consolidated financial statements) were available for grant under the LTIP at June 30, 2024.

The total intrinsic value of options exercised during the six-month periods ended June 30, 2024 and 2023 was $173.7 million and $123.8 million, respectively. As of June 30, 2024, we had approximately $149.9 million of total unrecognized compensation expense related to nonvested options. We expect to recognize that cost over a weighted average period of approximately four years.

Other information regarding stock options outstanding and exercisable at June 30, 2024 is summarized as follows (in millions, except exercise price and year data):

					Options Outstanding						Options Exercisable
							Weighted
							Average
							Remaining		Weighted				Weighted
							Contractual		Average				Average
					Number		Term		Exercise		Number		Exercise
Range of Exercise Prices					Outstanding		(in years)		Price		Exercisable		Price
$	70.74	—	$	70.74		0.4		0.71	$	70.74		0.4	$	70.74
	79.59	—		79.59		0.7		1.70		79.59		0.7		79.59
	86.17	—		86.17		1.1		2.70		86.17		0.6		86.17
	127.90	—		127.90		1.4		3.71		127.90		0.4		127.90
	156.85	—		156.85		1.0		4.59		156.85		—		—
	158.56	—		161.14		1.1		4.72		158.65		—		—
	177.09	—		202.13		1.1		5.72		177.78		—		—
	238.88	—		243.54		1.0		6.67		243.54		—		—
$	70.74	—	$	243.54		7.8		4.18	$	145.70		2.1	$	88.79

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Deferred Compensation

6 Months Ended

Jun. 30, 2024

Compensation Related Costs [Abstract]

Deferred Compensation

9. Deferred Compensation

We have a Deferred Equity Participation Plan (which we refer to as the DEPP), which is a non-qualified plan that generally provides for distributions to certain of our key executives when they reach age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later. Under the provisions of the DEPP, we typically contribute cash in an amount approved by the compensation committee to a rabbi trust on behalf of the executives participating in the DEPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. Distributions under the DEPP may not normally be made until the participant reaches age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) and are subject to forfeiture in the event of voluntary termination of employment or termination for cause prior to then. DEPP awards are generally made annually in the first quarter. In addition, we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65. All contributions to the plan (including sub-plans) deemed to be invested in shares of our common stock are distributed in the form of our common stock and all other distributions are paid in cash.

Our common stock that is issued to or purchased by the rabbi trust as a contribution under the DEPP is valued at historical cost, which equals its fair market value at the date of grant or date of purchase. When common stock is issued, we record an unearned deferred compensation obligation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock owed to the participants do not have any impact on the amounts recorded in our unaudited consolidated financial statements.

In the first quarters of 2024 and 2023, the compensation committee approved $23.2 million and $25.1 million, respectively, of awards in the aggregate to certain key executives under the DEPP that were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. We contributed cash to the rabbi trust and instructed the trustee to acquire a specified number of shares of our common stock on the open market to fund these 2024 and 2023 awards. During the three-month periods ended June 30, 2024 and 2023, we charged $5.6 million and $5.9 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $9.6 million and $9.9 million, respectively, to compensation expense related to these awards.

In the first quarters of 2024 and 2023, the compensation committee approved $2.3 million and $3.0 million, respectively, of awards under the sub-plans referred to above, which were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. During the three-month periods ended June 30, 2024 and 2023, we charged $0.6 million and $0.8 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $1.1 million and $1.4 million, respectively, to compensation expense related to these awards. There were $2.3 million of distributions from the

sub-plans during the six-month period ended June 30, 2024. There were $6.4 million of distributions from the sub‑plans during the six-month period ended June 30, 2023.

At June 30, 2024 and December 31, 2023, we recorded $95.5 million (related to 2.3 million shares) and $81.1 million (related to 2.2 million shares), respectively, of unearned deferred compensation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet. The total intrinsic value of our unvested equity-based awards under the plan at June 30, 2024 and December 31, 2023 was $584.4 million and $504.9 million, respectively. During the six-month periods ended June 30, 2024 and 2023, cash and equity awards with an aggregate fair value of $17.9 million and $9.4 million, respectively, were vested and distributed to executives under the DEPP.

We have a Deferred Cash Participation Plan (which we refer to as the DCPP), which is a non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the provisions of the DCPP, we typically contribute cash in an amount approved by the compensation committee to the rabbi trust on behalf of the executives participating in the DCPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. In the first quarters of 2024 and 2023, the compensation committee approved $8.1 million and $9.8 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in the first quarters of 2024 and 2023, respectively. During the three-month periods ended June 30, 2024 and 2023, we charged $5.1 million and $4.2 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we charged $9.9 million and $8.0 million, respectively, to compensation expense related to these awards. There were $13.6 million of distributions from the DCPP during the six-month period ended June 30, 2024. There were $19.5 million of distributions from the DCPP during the six-month period ended June 30, 2023.

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Restricted Stock, Performance Share and Cash Awards

6 Months Ended

Jun. 30, 2024

Text Block [Abstract]

Restricted Stock, Performance Share and Cash Awards

10. Restricted Stock, Performance Share and Cash Awards

Restricted Stock Awards

As discussed in Note 8 to these unaudited consolidated financial statements, on May 10, 2022, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2017 LTIP. The LTIP provides for the grant of a stock award either as restricted stock or as restricted stock units to officers, employees and non-employee directors. In either case, the compensation committee may determine that the award will be subject to the attainment of performance measures over an established performance period. Stock awards and the related dividend equivalents are non-transferable and subject to forfeiture if the holder does not remain continuously employed with us during the applicable restriction period or, in the case of a performance-based award, if applicable performance measures are not attained. The compensation committee will determine all of the terms relating to the satisfaction of performance measures and the termination of a restriction period, or the forfeiture and cancellation of a restricted stock award upon a termination of employment, whether by reason of disability, retirement, death or any other reason.

The agreements awarding restricted stock units under the LTIP will specify whether such awards may be settled in shares of our common stock, cash or a combination of shares and cash and whether the holder will be entitled to receive dividend equivalents, on a current or deferred basis, with respect to such award. Prior to the settlement of a restricted stock unit, the holder of a restricted stock unit will have no rights as a stockholder of the company. The maximum number of shares available under the LTIP for restricted stock, restricted stock units and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 4.0 million. At June 30, 2024, 2.5 million shares were available for grant under the LTIP for such awards.

In the first quarters of 2024 and 2023, we granted 345,000 and 378,000 restricted stock units, respectively, to employees under the LTIP, with an aggregate fair value of $83.9 million and $67.0 million, respectively, at the date of grant. These 2024 and 2023 awards of restricted stock units vest in full based on continued employment through March 1, 2029 and March 15, 2028, respectively.

We account for restricted stock awards at historical cost, which equals its fair market value at the date of grant, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our unaudited consolidated financial statements. During the three-month periods ended June 30, 2024 and 2023, we recognized $14.1 million and $11.0 million, respectively, to compensation expense related to restricted stock unit awards granted in 2017 through 2023. During the six-month periods ended June 30, 2024 and 2023, we recognized $27.0 million and $20.7 million, respectively, to compensation expense related to restricted stock unit awards granted in 2017 through 2023. The total intrinsic value of unvested restricted stock units at June 30, 2024 and 2023 was $512.7 million and $460.5 million, respectively. During the six-month periods ended June 30, 2024 and 2023, equity awards (including accrued dividends) with an aggregate value of $93.3 million and $62.0 million, respectively, were vested and distributed to employees under this plan.

Performance Share Awards

On March 1, 2024 and March 15, 2023, pursuant to the LTIP, respectively, the compensation committee approved 58,000 and 58,000, respectively, of provisional performance share awards, with an aggregate fair value of $14.2 million and $10.3 million, respectively, for future grants to our officers. Each performance share award was equivalent to the value of one share of our common stock on the date such provisional award was approved. At the end of the performance period, eligible participants will receive a number of earned shares based on the growth in adjusted EBITDAC per share (as defined in our 2024 Proxy Statement). Earned shares for the 2024 and 2023 provisional awards will fully vest based on continuous employment through March 1, 2027 and March 15, 2026, respectively, and will be settled in unrestricted shares of our common stock on a one-for-one basis as soon as practicable thereafter. The 2024 and 2023 awards are subject to a three-year performance period that began on January 1, 2024 and 2023, respectively, and vest on the three-year anniversary of the date of grant (March 1, 2027 and March 15, 2026). Performance share awards granted in 2023 to certain executive officers age 55 or older are not subject to forfeitures upon such officers' departure from the company after two years from date of grant. Performance share awards granted in 2024 to executive officers are not subject to forfeiture upon such officers’ departure from the company once they attain the age of 62. In each case, the awards vest on a pro rata basis based on the number of months rounded up during which the officer was employed during the three-year performance period. During the three-month periods ended June 30, 2024 and 2023, we recognized $5.6 million and $3.8 million, respectively, to compensation expense related to performance share awards granted in 2020 through 2024. During the six-month periods ended June 30, 2024 and 2023, we recognized $10.6 million and $8.5 million, respectively, to compensation expense related to performance share awards granted in 2020 through 2024. The total intrinsic value of unvested performance share awards at June 30, 2024 and 2023 was $85.2 million and $64.3 million, respectively. During the six-month periods ended June 30, 2024 and 2023, equity awards (including accrued dividends) with an aggregate fair value of $31.6 million and $28.9 million, respectively, were vested and distributed to employees under this plan.

Cash Awards

Pursuant to our Performance Unit Program (which we refer to as the Program), there were no units granted in the six-month periods ended June 30, 2024 and 2023. The Program consists of a one-year performance period based on our financial performance and a three-year vesting period measured from January 1 of the year of grant. At the discretion of the compensation committee and determined based on our performance, the eligible officer or key employee will be granted a percentage of the provisional cash award units that equates to the EBITDAC growth achieved (as defined in the Program). At the end of the performance period, eligible participants will be granted a number of units based on achievement of the performance goal and subject to approval by the compensation committee. Granted units will fully vest based on continuous employment through the three-year vesting period. The ultimate award value will be equal to the trailing twelve-month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date. The fair value of the awarded units will be paid out in cash as soon as practicable. If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited.

On March 15, 2022, pursuant to the Program, the compensation committee approved provisional cash awards of $19.9 million in the aggregate for future grants to our officers and key employees that are denominated in units (125,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. During the three-month periods ended June 30, 2024 and 2023, we recognized $3.3 million and $3.1 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2024 and 2023, we recognized $6.7 million and $5.7 million, respectively, to compensation expense related to these awards.

On March 16, 2021, pursuant to the Program, the compensation committee approved provisional cash awards of $18.8 million in the aggregate for future grants to our officers and key employees that are denominated in units (147,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. Based on our performance for 2021, we granted 143,000 units under the Program in the first quarter of 2022 that fully vested on January 1, 2024. During the three and six-month periods ended June 30, 2023, we recognized $3.2 million and $6.5 million, respectively, to compensation expense related to these awards.

During the six-month period ended June 30, 2024, cash awards related to the 2021 provisional award with an aggregate fair value of $25.4 million (129,000 units in the aggregate) were vested and distributed to employees under the program. During the six-month period ended June 30, 2023, cash awards related to the 2020 provisional award with an aggregate fair value of $24.7 million (191,000 units in the aggregate) were vested and distributed to employees under the Program.

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Derivatives and Hedging Activity

6 Months Ended

Jun. 30, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activity

11. Derivatives and Hedging Activity

We are exposed to market risks, including changes in foreign currency exchange rates and interest rates. To manage the risk related to these exposures, we enter into various derivative instruments that reduce these risks by creating offsetting exposures. We generally do not enter into derivative transactions for trading or speculative purposes.

Foreign Exchange Risk Management

We are exposed to foreign exchange risk when we earn revenues, pay expenses, or enter into monetary intercompany transfers denominated in a currency that differs from our functional currency, or other transactions that are denominated in a currency other than our functional currency. We use foreign exchange derivatives, typically forward contracts and options, to reduce our overall exposure to the effects of currency fluctuations on cash flows. These exposures are hedged, on average, for less than three years.

Interest Rate Risk Management

We enter into various long-term debt agreements. We use interest rate derivatives, typically swaps, to reduce our exposure to the effects of interest rate fluctuations on the forecasted interest rates for up to three years into the future.

We have not received or pledged any collateral related to derivative arrangements at June 30, 2024.

The notional and fair values of derivatives designated as hedging instruments are as follows at June 30, 2024 and December 31, 2023 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2024
Interest rate contracts	$	—	Other current assets	$	—	Accrued compensation and other current liabilities	$	—
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		46.4	Other current assets		4.9	Accrued compensation and other current liabilities		2.6
			Other noncurrent assets		10.1	Other noncurrent liabilities		4.1
Total	$	46.4		$	15.0		$	6.7
At December 31, 2023
Interest rate contracts	$	150.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	5.7
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		67.8	Other current assets		3.9	Accrued compensation and other current liabilities		3.9
			Other noncurrent assets		14.2	Other noncurrent liabilities		4.0
Total	$	217.8		$	18.1		$	13.6

(1)Included within foreign exchange contracts at June 30, 2024 were $819.3 million of call options, offset with $819.3 million of put options, and $3.0 million of buy forwards, offset with $49.4 million of sell forwards. Included within foreign exchange contracts at December 31, 2023 were $331.3 million of call options, offset with $331.3 million of put options, and $5.5 million of buy forwards, offset with $73.3 million of sell forwards.

The effect of cash flow hedge accounting on accumulated other comprehensive loss for the six-month periods ended June 30, 2024 and 2023 was as follows (in millions):

							Amount of
				Amount of			Gain
				Gain (Loss)			Recognized
	Amount of			Reclassified			in Earnings
	Gain (Loss)			from			Related to
	Recognized in			Accumulated			Amount
	Accumulated			Other			Excluded
	Other			Comprehensive			from
	Comprehensive			Loss into			Effectiveness		Statement of Earnings
Instrument	Loss (1)			Earnings			Testing		Classification
Three-month period ended June 30, 2024
Interest rate contracts	$	(3.6	)	$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		(0.4	)		(1.0	)		—	Commission revenue
					(0.4	)		0.2	Compensation expense
					(0.4	)		0.2	Operating expense
Total	$	(4.0	)	$	(2.1	)	$	0.4
Three-month period ended June 30, 2023
Interest rate contracts	$	18.9		$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		12.8			0.2			—	Commission revenue
					(0.5	)		0.4	Compensation expense
					(0.4	)		0.3	Operating expense
Total	$	31.7		$	(1.0	)	$	0.7
Six-month period ended June 30, 2024
Interest rate contracts	$	(2.9	)	$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		(3.8	)		(0.8	)		—	Commission revenue
					(0.9	)		0.5	Compensation expense
					(0.7	)		0.4	Operating expense
Total	$	(6.7	)	$	(3.0	)	$	0.9
Six-month period ended June 30, 2023
Interest rate contracts	$	8.8		$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		28.7			0.8			—	Commission revenue
					(1.0	)		1.0	Compensation expense
					(0.7	)		0.7	Operating expense
Total	$	37.5		$	(1.5	)	$	1.7

(1)For the three and six-month periods ended June 30, 2024, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of $0.1 million and a gain of $0.2 million, respectively. For the three and six-month periods ended June 30, 2023, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $0.3 million and $0.8 million, respectively.

We estimate that approximately $13.0 million of pretax gain currently included within accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.

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Commitments, Contingencies and Off-Balance Sheet Arrangements

6 Months Ended

Jun. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments, Contingencies and Off-Balance Sheet Arrangements

12. Commitments, Contingencies and Off-Balance Sheet Arrangements

In connection with our investing and operating activities, we have entered into certain contractual obligations and commitments. Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the Senior Notes, Note

Purchase Agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase obligations at June 30, 2024 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2024			2025			2026			2027			2028			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	4,550.0		$	4,550.0
Note Purchase Agreements		—			200.0			640.0			478.0			200.0			2,005.0			3,523.0
Credit Agreement		80.0			—			—			—			—			—			80.0
Premium Financing Debt Facility		207.8			—			—			—			—			—			207.8
Interest on debt		184.4			374.0			355.0			336.7			317.2			4,285.8			5,853.1
Total debt obligations		472.2			574.0			995.0			814.7			517.2			10,840.8			14,213.9
Operating lease obligations		54.2			108.9			90.5			73.3			55.8			92.4			475.1
Less sublease arrangements		(1.2	)		(1.8	)		(1.7	)		(1.6	)		(1.1	)		(0.8	)		(8.2	)
Outstanding purchase obligations		80.0			71.6			29.0			23.3			16.9			48.3			269.1
Total contractual obligations	$	605.2		$	752.7		$	1,112.8		$	909.7		$	588.8		$	10,980.7		$	14,949.9

The amounts presented in the table above may not necessarily reflect our actual future cash funding requirements, because the actual timing of the future payments made may vary from the stated contractual obligation.

Senior Notes, Note Purchase Agreements, Credit Agreement and Premium Financing Debt Facility - See Note 6 to these unaudited consolidated financial statements for a summary of the amounts outstanding under the Senior Notes, Note Purchase Agreements, the Credit Agreement and Premium Financing Debt Facility.

Operating Lease Obligations - Our corporate segment’s executive offices and certain subsidiary and branch facilities of our brokerage and risk management segments are located in a building we own at 2850 Golf Road, Rolling Meadows, Illinois, where we have approximately 360,000 square feet of space.

We generally operate in leased premises at our other locations. Certain of these leases have options permitting renewals for additional periods. In addition to minimum fixed rentals, a number of leases contain annual escalation clauses which are generally related to increases in an inflation index.

We have leased certain office space to several non-affiliated tenants under operating sublease arrangements. In the normal course of business, we expect that certain of these leases will not be renewed or replaced. We adjust charges for real estate taxes and common area maintenance annually based on actual expenses, and we recognize the related revenues in the year in which the expenses are incurred. These amounts are not included in the minimum future rentals to be received in the contractual obligations table above.

Outstanding Purchase Obligations - The amount disclosed in the contractual obligations table above represents the aggregate amount of unrecorded purchase obligations that we had outstanding at June 30, 2024. These obligations represent agreements to purchase goods or services that were executed in the normal course of business.

Off-Balance Sheet Commitments - Our total unrecorded commitments associated with outstanding letters of credit, and financial guarantees as of June 30, 2024 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2024		2025		2026		2027		2028		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	23.7	$	23.7
Financial guarantees		1.0		—		—		—		—		—		1.0
Total commitments	$	1.0	$	—	$	—	$	—	$	—	$	23.7	$	24.7

Since commitments may expire unused, the amounts presented in the table above do not necessarily reflect our actual future cash funding requirements. See the Off‑Balance Sheet Debt section below for a discussion of our letters of credit. All of the letters of credit represent multiple year commitments that have annual, automatic renewing provisions and are classified by the latest commitment date.

Since January 1, 2002, we have acquired 725 companies, all of which were accounted for using the acquisition method for recording business combinations. Substantially all of the purchase agreements related to these acquisitions contain provisions for potential earnout obligations. For all of our acquisitions made in the period from 2020 to 2024 that contain potential earnout obligations, such

obligations are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration for the respective acquisition. The amounts recorded as earnout payables are primarily based upon estimated future potential operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The aggregate amount of the maximum earnout obligations related to these acquisitions was $1,925.8 million, of which $1,236.7 million was recorded in our consolidated balance sheet as of June 30, 2024 based on the estimated fair value of the expected future payments to be made, of which approximately $491.8 million can be settled in cash or stock at our option and $744.9 million must be settled in cash.

Off-Balance Sheet Debt - Our unconsolidated investment portfolio includes investments in enterprises where our ownership interest is between 1% and 50%, in which management has determined that our level of influence and economic interest is not sufficient to require consolidation. As a result, these investments are accounted for under the equity method. None of these unconsolidated investments had any outstanding debt at June 30, 2024 or December 31, 2023, that was recourse to us.

At June 30, 2024, we had posted two letters of credit totaling $9.3 million, in the aggregate, related to our self‑insurance deductibles, for which we had a recorded liability of $14.0 million. We have an equity investment in a rent-a-captive facility, which we use as a placement facility for certain of our insurance brokerage operations. At June 30, 2024, we had posted eight letters of credit totaling $13.0 million to allow certain of our captive operations to meet minimum statutory surplus requirements plus additional collateral related to premium and claim funds held in a fiduciary capacity, one letter of credit totaling $0.9 million for collateral related to claim funds held in a fiduciary capacity by a recent acquisition and one letter of credit totaling $0.5 million as a security deposit for a 2015 acquisition’s lease. These letters of credit have never been drawn upon.

Litigation, Regulatory and Taxation Matters - We routinely are involved in legal proceedings, claims, disputes, regulatory matters and governmental inspections or investigations arising in the ordinary course of or incidental to our business, including those noted below in this section. We record accruals in the unaudited consolidated financial statements for pending litigation when we determine that an unfavorable outcome is probable and the amount of the loss can be reasonably estimated. For the matters we disclose that do not include an estimate of the amount of loss or range of losses, such an estimate is not possible or is immaterial, and we may be unable to estimate the possible loss or range of losses that could potentially result from the application of non-monetary remedies, unless disclosed below. We currently believe that the ultimate outcome of these proceedings, individually and in the aggregate, will not materially harm our financial position, results of operations or cash flows. However, legal proceedings and government investigations are subject to inherent uncertainties, and unfavorable rulings or other adverse events could occur, including the payment of substantial monetary damages or an injunction or other order prohibiting us from selling one or more products at all or in particular ways, precluding particular business practices or requiring other remedies, which may result in a material adverse impact on our business, results of operations or financial position.

As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services business has been under audit by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promoter in connection with these operations. Additionally, the IRS is conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not a target of the criminal investigation. We are fully cooperating with both matters.

Contingent Liabilities - We purchase insurance to provide protection from errors and omissions (which we refer to as E&O) claims that may arise during the ordinary course of business. Currently we retain the first $15.0 million of each and every E&O claim. In addition, we retain, in aggregate, up to another $2.0 million between $15.0 million and $100.0 million, plus up to another $10.0 million between $100.0 million and $225.0 million, and up to another $20.0 million between $225.0 million and $400.0 million. We have historically maintained self-insurance reserves for the portion of our E&O exposure that is not insured. We periodically determine a range of possible reserve levels using actuarial techniques that rely heavily on projecting historical claim data into the future. Our E&O reserve in the June 30, 2024 consolidated balance sheet is above the lower end of the most recently determined actuarial range by $6.2 million and below the upper end of the actuarial range by $8.8 million. We can make no assurances that the historical claim data used to project the current reserve levels will be indicative of future claim activity. Thus, the E&O reserve level and corresponding actuarial range could change in the future as more information becomes known, which could materially impact the amounts reported and disclosed herein.

Tax-advantaged Investments No Longer Held - Between 1996 and 2007, we developed and then sold portions of our ownership in various energy related investments, many of which qualified for tax credits under IRC Section 29. We recorded tax benefits in connection with our ownership in these investments. At June 30, 2024, we had exposure on $108.0 million of previously earned tax credits. Under the Tax Cuts and Jobs Act, a portion of these previously earned tax credits were refunded in 2019 for tax year 2018, according to a specific formula. Under the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), which was passed on March 27, 2020, we accelerated the refund of all remaining credits on April 17, 2020, and the remaining credits were refunded to us in the second quarter of 2020. In 2004, 2007 and 2009, the IRS examined several of these investments and all examinations were closed without any changes being proposed by the IRS. However, any future adverse tax audits, administrative rulings or judicial decisions could disallow previously claimed tax credits.

Due to the contingent nature of this exposure and our related assessment of its likelihood, no reserve has been recorded in our June 30, 2024 consolidated balance sheet related to this exposure.

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Supplemental Disclosures of Cash Flow Information

6 Months Ended

Jun. 30, 2024

Cash and Cash Equivalents [Abstract]

Supplemental Disclosures of Cash Flow Information

13. Supplemental Disclosures of Cash Flow Information

	Six-month period ended June 30,
Supplemental disclosures of cash flow information (in millions):	2024		2023
Interest paid	$	162.1	$	127.3
Income taxes paid, net		167.8		116.7

The following is a reconciliation of our end of period cash, cash equivalents, restricted cash and fiduciary cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2024 and 2023 (in millions):

	June 30,
	2024		2023
Cash and cash equivalents - non-restricted cash	$	1,219.2	$	777.9
Cash and cash equivalents - restricted cash		196.1		174.4
Total cash and cash equivalents		1,415.3		952.3
Fiduciary cash		5,422.5		5,989.9
Total cash, cash equivalents, restricted cash and fiduciary cash	$	6,837.8	$	6,942.2

Fiduciary cash is included in fiduciary assets in our consolidated balance sheet.

We have a qualified contributory savings and thrift 401(k) plan covering the majority of our domestic employees. For eligible employees who have met the plan’s age and service requirements to receive matching contributions, we historically have matched 100% of pre-tax and Roth elective deferrals up to a maximum of 5.0% of eligible compensation, subject to federal limits on plan contributions and not in excess of the maximum amount deductible for federal income tax purposes. Beginning in 2021, the amount matched by the company will be discretionary and annually determined by management. Employees must be employed and eligible for the plan on the last day of the plan year to receive a matching contribution, subject to certain exceptions enumerated in the plan document. Matching contributions are subject to a five-year graduated vesting schedule and can be funded in cash or company stock. We expensed (net of plan forfeitures) $56.0 million and $42.3 million related to the plan in the six-month periods ended June 30, 2024 and 2023, respectively. During 2023, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2023 plan year to be funded with our common stock, which was funded in February 2024. During 2022, our board of directors authorized the 5.0% employer matching contribution on eligible compensation to the 401(k) plan for the 2022 plan year to be funded with our common stock, which was funded in February 2023.

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Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

Accumulated Other Comprehensive Loss

14. Accumulated Other Comprehensive Loss

The after-tax components of our accumulated other comprehensive loss attributable to controlling interests consist of the following (in millions):

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2023	$	(37.1	)	$	(867.4	)	$	112.4		$	(792.1	)
Net change in period		0.2			(144.5	)		(2.8	)		(147.1	)
Balance as of June 30, 2024	$	(36.9	)	$	(1,011.9	)	$	109.6		$	(939.2	)

The foreign currency translation during the six-month period ended June 30, 2024 relates to the net impact of changes in the value of the local currencies relative to the U.S. dollar for our operations in the Australia, Canada, the Caribbean, India, New Zealand, the U.K. and other non-U.S. locations. The reporting currency for our financial statements is the U.S. dollar. Certain of our assets, liabilities, expenses and revenues are denominated in currencies other than the U.S. dollar, primarily the Australian dollar, British pound, Canadian dollar and New Zealand dollar. To prepare our unaudited consolidated financial statements, we must translate those assets, liabilities, expenses and revenues into U.S. dollars at the applicable exchange rates. Assets and liabilities of non-U.S. dollar functional currency operations are translated into U.S. dollars at end-of-period exchange rates while revenues, expenses and cash flows are translated at average monthly exchange rates over the period. Equity is translated at historical exchange rates and the resulting cumulative translation adjustments are included as a component of accumulated other comprehensive loss in the consolidated balance

sheet. The net change in the foreign currency translation during the six-month period ended June 30, 2024 primarily relates to goodwill (see Note 5 for the impact on goodwill) and amortizable intangible assets held by operations with a non-U.S. dollar functional currency.

During the six-month periods ended June 30, 2024 and 2023, $1.0 million and $2.6 million, of expense, respectively, related to the pension liability was reclassified from accumulated other comprehensive loss to compensation expense in the statement of earnings. During the six-month periods ended June 30, 2024 and 2023, $3.0 million and $1.5 million of expense, respectively, related to the fair value of derivative investments, was reclassified from accumulated other comprehensive loss to the statement of earnings. During the six-month periods ended June 30, 2024 and 2023, no amounts related to foreign currency translation were reclassified from accumulated other comprehensive loss to the statement of earnings.

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Segment Information

6 Months Ended

Jun. 30, 2024

Segment Reporting [Abstract]

Segment Information

15. Segment Information

We have three reportable segments: brokerage, risk management and corporate.

The brokerage segment is primarily comprised of our retail and wholesale insurance and reinsurance brokerage operations. The brokerage segment (which comprises our retail property/casualty, wholesale, reinsurance, benefits and captive operations) generates revenues through commissions paid by underwriting enterprises and through fees charged to our clients. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients and we do not assume net underwriting risks.

The risk management segment provides contract claim settlement and administration services for commercial, nonprofit, captive and public sector entities, and various organizations that choose to self-insure some or all of their property/casualty coverages and for underwriting enterprises that choose to outsource some or all of their property/casualty claims departments. These operations also provide claims management, loss control consulting and insurance property appraisal services. Revenues are principally generated on a negotiated per-claim or per-service fee basis. Our risk management segment also provides risk management consulting services that are recognized as the services are delivered.

The corporate segment manages our clean energy and other investments. In addition, the corporate segment reports the financial information related to our debt and other corporate costs, external acquisition-related expenses and the impact of foreign currency remeasurements.

Allocations of interest income and certain expenses are based on reasonable assumptions and estimates primarily using revenue, headcount and other information. We allocate the provision for income taxes to the brokerage and risk management segments using the local country statutory rates. Reported operating results by segment would change if different methods were applied.

Financial information relating to our segments for the three and six-month periods ended June 30, 2024 and 2023 as follows

(in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Brokerage
Total revenues	$	2,376.3		$	2,088.4		$	5,241.2		$	4,463.6
Earnings before income taxes	$	446.3		$	390.5		$	1,322.4		$	1,081.4
Identifiable assets at June 30, 2024 and 2023							$	58,776.7		$	50,623.8
Risk Management
Total revenues	$	398.0		$	353.6		$	789.4		$	684.4
Earnings before income taxes	$	65.4		$	49.9		$	118.6		$	95.4
Identifiable assets at June 30, 2024 and 2023							$	1,683.4		$	1,212.8
Corporate
Total revenues	$	1.1		$	(0.1	)	$	1.5		$	—
Loss before income taxes	$	(146.1	)	$	(143.0	)	$	(302.7	)	$	(273.6	)
Identifiable assets at June 30, 2024 and 2023							$	2,547.6		$	2,528.6
Total
Total revenues	$	2,775.4		$	2,441.9		$	6,032.1		$	5,148.0
Earnings before income taxes	$	365.6		$	297.4		$	1,138.3		$	903.2
Identifiable assets at June 30, 2024 and 2023							$	63,007.7		$	54,365.2

Disaggregation of Revenue

We disaggregate our revenue from contracts with clients by type and geographic location for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.

Revenues by type and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,661.8	$	—	$	—	$	1,661.8
Fees		477.6		349.5		—		827.1
Supplemental revenues		88.7		—		—		88.7
Contingent revenues		59.8		—		—		59.8
Interest income, premium finance revenues and other income		88.4		9.1		1.1		98.6
Revenues before reimbursements		2,376.3		358.6		1.1		2,736.0
Reimbursements		—		39.4		—		39.4
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

Revenues by type and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,655.4	$	—	$	—	$	3,655.4
Fees		1,084.3		694.0		—		1,778.3
Supplemental revenues		182.6		—		—		182.6
Contingent revenues		145.8		—		—		145.8
Interest income, premium finance revenues and other income		173.1		17.4		1.5		192.0
Revenues before reimbursements		5,241.2		711.4		1.5		5,954.1
Reimbursements		—		78.0		—		78.0
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by geographical location and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,394.6	$	324.2	$	1.1	$	1,719.9
United Kingdom		574.6		14.0		—		588.6
Australia		90.9		56.0		—		146.9
Canada		110.3		1.7		—		112.0
New Zealand		55.9		2.1		—		58.0
Other foreign		150.0		—		—		150.0
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

Revenues by geographical location and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	3,208.6	$	644.7	$	1.5	$	3,854.8
United Kingdom		1,159.4		28.0		—		1,187.4
Australia		158.9		109.0		—		267.9
Canada		213.4		3.4		—		216.8
New Zealand		97.6		4.3		—		101.9
Other foreign		403.3		—		—		403.3
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by type and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
Commissions	$	1,410.4	$	—	$	—		$	1,410.4
Fees		478.5		312.0		—			790.5
Supplemental revenues		71.2		—		—			71.2
Contingent revenues		54.2		—		—			54.2
Interest income, premium finance revenues and other income		74.1		6.6		(0.1	)		80.6
Revenues before reimbursements		2,088.4		318.6		(0.1	)		2,406.9
Reimbursements		—		35.0		—			35.0
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

Revenues by type and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,157.8	$	—	$	—	$	3,157.8
Fees		891.2		605.0		—		1,496.2
Supplemental revenues		152.8		—		—		152.8
Contingent revenues		126.0		—		—		126.0
Interest income, premium finance revenues and other income		135.8		11.2		—		147.0
Revenues before reimbursements		4,463.6		616.2		—		5,079.8
Reimbursements		—		68.2		—		68.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

Revenues by geographical location and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
United States	$	1,199.7	$	298.7	$	(0.1	)	$	1,498.3
United Kingdom		527.6		11.6		—			539.2
Australia		83.8		37.5		—			121.3
Canada		104.6		1.5		—			106.1
New Zealand		53.0		4.3		—			57.3
Other foreign		119.7		—		—			119.7
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

Revenues by geographical location and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	2,675.0	$	578.8	$	—	$	3,253.8
United Kingdom		1,041.1		22.9		—		1,064.0
Australia		148.0		71.5		—		219.5
Canada		198.3		3.0		—		201.3
New Zealand		91.0		8.2		—		99.2
Other foreign		310.2		—		—		310.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2024

Accounting Policies [Abstract]

Nature of Operations and Basis of Presentation

Nature of Operations and Basis of Presentation

Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us, Gallagher or the company, provide insurance and reinsurance brokerage, consulting and third party claims settlement and administration services to both domestic and international entities. We have three reportable segments: brokerage, risk management and corporate. Our brokers, agents and administrators act as intermediaries between underwriting enterprises and our clients.

Our brokerage segment operations provide brokerage and consulting services to entities of all types, including commercial, nonprofit, public sector entities, and, to a lesser extent, individuals, in the areas of insurance and reinsurance placements, risk of loss management, and management of employer sponsored benefit programs. Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, nonprofit, captive and public sector entities, and various other organizations that choose to self-insure property/casualty coverages or choose to use a third‑party claims management organization rather than the claim services provided by underwriting enterprises. The corporate segment reports the financial information related to our debt and other corporate costs, clean energy investments, external acquisition‑related expenses and the impact of foreign currency translation.

We do not assume insurance underwriting risk on a net basis, other than with respect to de minimis amounts necessary to provide minimum or regulatory capital to organize captives, pools, specialized underwriters or risk-retention groups. Rather, capital necessary for covering losses is provided by underwriting enterprises.

Interest income, premium finance revenues and other income are primarily generated from our premium financing operations, our invested cash and restricted cash we hold on behalf of our clients, as well as clean energy investments. In addition, our share of the net earnings related to partially owned entities that are accounted for using the equity method is included in other income.

We are a global insurance brokerage, risk management and consulting services firm, headquartered in Rolling Meadows, Illinois. We provide these services in approximately 130 countries around the world through our owned operations and a network of correspondent brokers and consultants. We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in annual financial statements have been omitted pursuant to such rules and regulations. The unaudited consolidated financial statements included herein are, in the opinion of management, prepared on a basis consistent with our audited consolidated financial statements for the year ended December 31, 2023, and include all normal recurring adjustments necessary for a fair presentation of the information set forth herein. The quarterly results of operations are not necessarily indicative of the results of operations to be reported for subsequent quarters or the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2023. In the preparation of our unaudited consolidated financial statements as of June 30, 2024, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued, for potential recognition and/or disclosure therein.

Use of Estimates

Use of Estimates

The preparation of our unaudited consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These accounting principles require us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenues and expenses, and the disclosure of contingent assets and liabilities at the date of our unaudited consolidated financial statements. We periodically evaluate our estimates and assumptions, including those relating to the valuation of goodwill and other intangible assets, right-of-use assets, investments, income taxes, revenue recognition, deferred costs, stock-based compensation, claims handling obligations, retirement plans, litigation and contingencies. We base our estimates on historical experience and various assumptions that we believe to be reasonable based on specific circumstances. Such estimates and assumptions could change in the future as more information becomes known, which could impact the amounts reported and disclosed in the notes herein.

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Business Combinations (Tables)

6 Months Ended

Jun. 30, 2024

Business Combinations [Abstract]

Acquisition Method for Recording Business Combinations

During the six-month period ended June 30, 2024, we acquired substantially all of the ownership interest or net assets, as applicable, of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions, except share data):

													Total		Maximum
	Common		Common								Recorded		Recorded		Potential
Name and Effective	Shares		Share				Accrued		Escrow		Earnout		Purchase		Earnout
Date of Acquisition	Issued		Value		Cash Paid		Liability		Deposited		Payable		Price		Payable
	(000s)
Ericson Insurance Services, LLC    January 1, 2024 (EIS)		129	$	30.1	$	26.5	$	—	$	3.0	$	7.0	$	66.6	$	10.0
The Rowley Agency, LLC    January 1, 2024 (TRA)		—		—		117.2		—		11.0		—		128.2		—
OperationsInc, LLC    June 1, 2024 (OPR)		—	$	—	$	52.6	$	—	$	2.8	$	11.0	$	66.4	$	20.0
Twenty-one other acquisitions    completed in 2024		229		48.8		271.3		2.6		16.8		53.3		392.8		108.5
		358	$	78.9	$	467.6	$	2.6	$	33.6	$	71.3	$	654.0	$	138.5

Summary of Estimated Fair Values of Net Assets Acquired

The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in the six-month period ended June 30, 2024 (in millions):

							Twenty-one Other
	EIS		TRA		OPR		Acquisitions		Total
Cash and cash equivalents	$	0.1	$	4.1	$	0.8	$	9.9	$	14.9
Fiduciary assets		1.0		2.6		—		34.1		37.7
Other current assets		3.5		0.5		2.7		11.3		18.0
Fixed assets		—		0.4		—		0.7		1.1
Noncurrent assets		0.1		1.7		2.0		3.8		7.6
Goodwill		27.4		65.8		41.9		205.9		341.0
Expiration lists		35.9		57.4		22.1		185.5		300.9
Non-compete agreements		0.5		0.6		0.2		6.2		7.5
Trade names		—		—		—		0.3		0.3
Total assets acquired		68.5		133.1		69.7		457.7		729.0
Fiduciary liabilities		1.0		2.6		—		34.1		37.7
Current liabilities		0.8		0.6		1.1		14.7		17.2
Noncurrent liabilities		0.1		1.7		2.2		16.1		20.1
Total liabilities assumed		1.9		4.9		3.3		64.9		75.0
Total net assets acquired	$	66.6	$	128.2	$	66.4	$	392.8	$	654.0

Summary of Unaudited Pro Forma Historical Results

The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2023 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Total revenues	$	2,785.4	$	2,478.5	$	6,061.9	$	5,223.0
Net earnings attributable to controlling interests		283.9		235.8		893.7		724.9
Basic net earnings per share		1.30		1.10		4.10		3.38
Diluted net earnings per share		1.27		1.07		4.02		3.32

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Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers

Information about unbilled receivables, contract assets and contract liabilities from contracts with customers is as follows (in millions):

	June 30, 2024		December 31, 2023
Unbilled receivables	$	1,536.6	$	1,093.7
Deferred contract costs		123.0		169.1
Deferred revenue		762.9		706.2

Summary of Changes in Deferred Revenue Balances

Significant changes in the deferred revenue balances, which include foreign currency translation adjustments, during the period are as follows (in millions):

				Risk
	Brokerage			Management			Total
Deferred revenue at December 31, 2023	$	533.6		$	172.6		$	706.2
Incremental deferred revenue		417.5			45.5			463.0
Revenue recognized during the six-month period ended   June 30, 2024 included in deferred revenue at December 31, 2023		(343.5	)		(42.1	)		(385.6	)
Net change in collected billings/deposits received from customers		(22.8	)		(0.9	)		(23.7	)
Impact of change in foreign exchange rates		(2.2	)		(0.1	)		(2.3	)
Deferred revenue recognized from business acquisitions		5.3			—			5.3
Deferred revenue at June 30, 2024	$	587.9		$	175.0		$	762.9

Summary of Expected Revenue Related to Performance Obligations

The estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period is as follows (in millions):

	Brokerage		Risk Management		Total
2024 (remaining six months)	$	504.9	$	86.4	$	591.3
2025		64.2		38.9		103.1
2026		16.8		17.4		34.2
2027		1.0		13.0		14.0
2028		0.5		6.8		7.3
Thereafter		0.5		12.5		13.0
Total	$	587.9	$	175.0	$	762.9

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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations

The carrying amount of goodwill at June 30, 2024 and December 31, 2023 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2024
United States	$	6,651.7	$	74.8	$	—	$	6,726.5
United Kingdom		2,503.1		18.4		—		2,521.5
Canada		606.8		—		—		606.8
Australia		522.6		234.5		—		757.1
New Zealand		197.0		9.2		—		206.2
Other foreign		1,078.5		—		18.9		1,097.4
Total goodwill	$	11,559.7	$	336.9	$	18.9	$	11,915.5
At December 31, 2023
United States	$	6,304.5	$	74.8	$	—	$	6,379.3
United Kingdom		2,493.4		18.5		—		2,511.9
Canada		623.7		—		—		623.7
Australia		514.6		135.9		—		650.5
New Zealand		204.2		9.6		—		213.8
Other foreign		1,077.4		—		19.0		1,096.4
Total goodwill	$	11,217.8	$	238.8	$	19.0	$	11,475.6

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the six-month period ended June 30, 2024 are as follows (in millions):

	Brokerage			Risk Management			Corporate			Total
Balance as of December 31, 2023	$	11,217.8		$	238.8		$	19.0		$	11,475.6
Goodwill acquired during the period		341.0			—			—			341.0
Goodwill true-ups due to appraisals and other acquisition    adjustments (see Note 3)		94.4			102.0			—			196.4
Goodwill written-off related to sales of business and impairment		(5.8	)		—			—			(5.8	)
Foreign currency translation adjustments during the period		(87.7	)		(3.9	)		(0.1	)		(91.7	)
Balance as of June 30, 2024	$	11,559.7		$	336.9		$	18.9		$	11,915.5

Major Classes of Amortizable Intangible Assets

Major classes of amortizable intangible assets at June 30, 2024 and December 31, 2023 consist of the following (in millions):

	June 30,			December 31,
	2024			2023
Expiration lists	$	8,341.8		$	8,222.8
Accumulated amortization - expiration lists		(4,025.8	)		(3,733.2	)
		4,316.0			4,489.6
Non-compete agreements		103.3			112.2
Accumulated amortization - non-compete agreements		(79.9	)		(74.9	)
		23.4			37.3
Trade names		119.7			171.8
Accumulated amortization - trade names		(69.7	)		(65.4	)
		50.0			106.4
Net amortizable assets	$	4,389.4		$	4,633.3

Estimated Aggregate Amortization Expense

Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):

2024 (remaining six months)	$	310.1
2025		587.5
2026		544.3
2027		510.5
2028		470.1
Thereafter		1,966.9
Total	$	4,389.4

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Credit and Other Debt Agreements (Tables)

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Summary of Corporate and Other Debt

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2024			2023
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.40%, balloon due November 9, 2031	$	400.0		$	400.0
Semi-annual payments of interest, fixed rate of 5.50%, balloon due March 2, 2033		350.0			350.0
Semi-annual payments of interest, fixed rate of 6.50%, balloon due February 15, 2034		400.0			400.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due July 15, 2034		500.0			—
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			850.0
Semi-annual payments of interest, fixed rate of 3.05%, balloon due March 9, 2052		350.0			350.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due March 2, 2053		600.0			600.0
Semi-annual payments of interest, fixed rate of 6.75%, balloon due February 15, 2054		600.0			600.0
Semi-annual payments of interest, fixed rate of 5.75%, balloon due July 15, 2054		500.0			—
Total Senior Notes		4,550.0			3,550.0
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		—			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		—			325.0
Semi-annual payments of interest, fixed rate of 4.31%, balloon due June 24, 2025		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.85%, balloon due February 13, 2026		140.0			140.0
Semi-annual payments of interest, fixed rate of 4.73%, balloon due February 27, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.40%, balloon due June 2, 2026		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.36%, balloon due June 24, 2026		150.0			150.0
Semi-annual payments of interest, fixed rate of 3.75%, balloon due January 30, 2027		30.0			30.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due June 27, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due August 2, 2027		125.0			125.0
Semi-annual payments of interest, fixed rate of 4.14%, balloon due August 4, 2027		98.0			98.0
Semi-annual payments of interest, fixed rate of 3.46%, balloon due December 1, 2027		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.55%, balloon due June 2, 2028		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 13, 2028		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.04%, balloon due February 13, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.98%, balloon due February 27, 2029		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due June 27, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.19%, balloon due August 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.48%, balloon due December 2, 2029		50.0			50.0
Semi-annual payments of interest, fixed rate of 3.99%, balloon due January 30, 2030		341.0			341.0
Semi-annual payments of interest, fixed rate of 4.44%, balloon due June 13, 2030		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.14%, balloon due March 13, 2031		180.0			180.0
Semi-annual payments of interest, fixed rate of 4.70%, balloon due June 2, 2031		25.0			25.0
Semi-annual payments of interest, fixed rate of 4.09%, balloon due January 30, 2032		69.0			69.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due June 27, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.34%, balloon due August 2, 2032		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.59%, balloon due June 13, 2033		125.0			125.0
Semi-annual payments of interest, fixed rate of 5.29%, balloon due March 13, 2034		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.48%, balloon due June 12, 2034		175.0			175.0
Semi-annual payments of interest, fixed rate of 4.24%, balloon due January 30, 2035		79.0			79.0
Semi-annual payments of interest, fixed rate of 2.44%, balloon due February 10, 2036		100.0			100.0
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		75.0			75.0
Semi-annual payments of interest, fixed rate of 4.69%, balloon due June 13, 2038		75.0			75.0
Semi-annual payments of interest, fixed rate of 5.45%, balloon due March 13, 2039		40.0			40.0
Semi-annual payments of interest, fixed rate of 4.49%, balloon due January 30, 2040		56.0			56.0
Total Note Purchase Agreements		3,523.0			3,948.0
Credit Agreement:
Periodic payments of interest and principal, prime or SOFR plus up    to 1.075%, expires June 22, 2028		80.0			245.0
Premium Financing Debt Facility - expires October 31, 2025:
Facility B
AUD denominated tranche, interbank rates plus 1.500%		199.6			249.0
NZD denominated tranche, interbank rates plus 1.850%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.830%		—			31.4
NZD denominated tranche, interbank rates plus 0.990%		8.2			8.6
Total Premium Financing Debt Facility		207.8			289.0
Total corporate and other debt		8,360.8			8,032.0
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(46.8	)		(38.4	)
Less unamortized discount on Bonds Payable		(35.3	)		(28.6	)
Net corporate and other debt	$	8,278.7		$	7,965.0

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net EPS

The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2024		2023		2024		2023
Net earnings attributable to controlling interests	$	283.4	$	234.5	$	891.8	$	721.0
Weighted average number of common shares outstanding		218.8		214.9		218.1		213.8
Dilutive effect of stock options using the treasury    stock method		4.1		4.1		4.3		4.2
Weighted average number of common and common    equivalent shares outstanding		222.9		219.0		222.4		218.0
Basic net earnings per share	$	1.30	$	1.09	$	4.09	$	3.37
Diluted net earnings per share	$	1.27	$	1.07	$	4.01	$	3.31

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Stock Option Plans (Tables)

6 Months Ended

Jun. 30, 2024

Text Block [Abstract]

Black-Scholes Option Pricing Model with Weighted Average

For purposes of expense recognition, the estimated fair values of the stock option grants are amortized to expense over the options’ vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	2024			2023
Expected dividend yield		1.0	%		1.2	%
Expected risk-free interest rate		4.2	%		3.6	%
Volatility		25.3	%		25.0	%
Expected life (in years)		5.5			5.4

Stock Option Activity and Related Information

The following is a summary of our stock option activity and related information for 2024 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2024
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.9		$	123.85
Granted		1.0			243.54
Exercised		(1.0	)		76.40
Forfeited or canceled		(0.1	)		151.05
Ending balance		7.8		$	145.70		4.18	$	883.9
Exercisable at end of period		2.1		$	88.79		2.19	$	353.9
Ending unvested and expected to vest		5.2		$	164.50		4.86	$	494.1

Other Information Regarding Stock Options Outstanding and Exercisable

Other information regarding stock options outstanding and exercisable at June 30, 2024 is summarized as follows (in millions, except exercise price and year data):

					Options Outstanding						Options Exercisable
							Weighted
							Average
							Remaining		Weighted				Weighted
							Contractual		Average				Average
					Number		Term		Exercise		Number		Exercise
Range of Exercise Prices					Outstanding		(in years)		Price		Exercisable		Price
$	70.74	—	$	70.74		0.4		0.71	$	70.74		0.4	$	70.74
	79.59	—		79.59		0.7		1.70		79.59		0.7		79.59
	86.17	—		86.17		1.1		2.70		86.17		0.6		86.17
	127.90	—		127.90		1.4		3.71		127.90		0.4		127.90
	156.85	—		156.85		1.0		4.59		156.85		—		—
	158.56	—		161.14		1.1		4.72		158.65		—		—
	177.09	—		202.13		1.1		5.72		177.78		—		—
	238.88	—		243.54		1.0		6.67		243.54		—		—
$	70.74	—	$	243.54		7.8		4.18	$	145.70		2.1	$	88.79

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Derivatives and Hedging Activity (Tables)

6 Months Ended

Jun. 30, 2024

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Notional and Fair Values of Derivative Instruments

The notional and fair values of derivatives designated as hedging instruments are as follows at June 30, 2024 and December 31, 2023 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2024
Interest rate contracts	$	—	Other current assets	$	—	Accrued compensation and other current liabilities	$	—
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		46.4	Other current assets		4.9	Accrued compensation and other current liabilities		2.6
			Other noncurrent assets		10.1	Other noncurrent liabilities		4.1
Total	$	46.4		$	15.0		$	6.7
At December 31, 2023
Interest rate contracts	$	150.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	5.7
			Other noncurrent assets		—	Other noncurrent liabilities		—
Foreign exchange contracts (1)		67.8	Other current assets		3.9	Accrued compensation and other current liabilities		3.9
			Other noncurrent assets		14.2	Other noncurrent liabilities		4.0
Total	$	217.8		$	18.1		$	13.6

(1)Included within foreign exchange contracts at June 30, 2024 were $819.3 million of call options, offset with $819.3 million of put options, and $3.0 million of buy forwards, offset with $49.4 million of sell forwards. Included within foreign exchange contracts at December 31, 2023 were $331.3 million of call options, offset with $331.3 million of put options, and $5.5 million of buy forwards, offset with $73.3 million of sell forwards.

Summary of Amounts of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Loss

The effect of cash flow hedge accounting on accumulated other comprehensive loss for the six-month periods ended June 30, 2024 and 2023 was as follows (in millions):

							Amount of
				Amount of			Gain
				Gain (Loss)			Recognized
	Amount of			Reclassified			in Earnings
	Gain (Loss)			from			Related to
	Recognized in			Accumulated			Amount
	Accumulated			Other			Excluded
	Other			Comprehensive			from
	Comprehensive			Loss into			Effectiveness		Statement of Earnings
Instrument	Loss (1)			Earnings			Testing		Classification
Three-month period ended June 30, 2024
Interest rate contracts	$	(3.6	)	$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		(0.4	)		(1.0	)		—	Commission revenue
					(0.4	)		0.2	Compensation expense
					(0.4	)		0.2	Operating expense
Total	$	(4.0	)	$	(2.1	)	$	0.4
Three-month period ended June 30, 2023
Interest rate contracts	$	18.9		$	(0.3	)	$	—	Interest expense
Foreign exchange contracts		12.8			0.2			—	Commission revenue
					(0.5	)		0.4	Compensation expense
					(0.4	)		0.3	Operating expense
Total	$	31.7		$	(1.0	)	$	0.7
Six-month period ended June 30, 2024
Interest rate contracts	$	(2.9	)	$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		(3.8	)		(0.8	)		—	Commission revenue
					(0.9	)		0.5	Compensation expense
					(0.7	)		0.4	Operating expense
Total	$	(6.7	)	$	(3.0	)	$	0.9
Six-month period ended June 30, 2023
Interest rate contracts	$	8.8		$	(0.6	)	$	—	Interest expense
Foreign exchange contracts		28.7			0.8			—	Commission revenue
					(1.0	)		1.0	Compensation expense
					(0.7	)		0.7	Operating expense
Total	$	37.5		$	(1.5	)	$	1.7

(1)For the three and six-month periods ended June 30, 2024, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of $0.1 million and a gain of $0.2 million, respectively. For the three and six-month periods ended June 30, 2023, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $0.3 million and $0.8 million, respectively.

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Commitments, Contingencies and Off-Balance Sheet Arrangements (Tables)

6 Months Ended

Jun. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligations

Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the Senior Notes, Note

Purchase Agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase obligations at June 30, 2024 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2024			2025			2026			2027			2028			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	4,550.0		$	4,550.0
Note Purchase Agreements		—			200.0			640.0			478.0			200.0			2,005.0			3,523.0
Credit Agreement		80.0			—			—			—			—			—			80.0
Premium Financing Debt Facility		207.8			—			—			—			—			—			207.8
Interest on debt		184.4			374.0			355.0			336.7			317.2			4,285.8			5,853.1
Total debt obligations		472.2			574.0			995.0			814.7			517.2			10,840.8			14,213.9
Operating lease obligations		54.2			108.9			90.5			73.3			55.8			92.4			475.1
Less sublease arrangements		(1.2	)		(1.8	)		(1.7	)		(1.6	)		(1.1	)		(0.8	)		(8.2	)
Outstanding purchase obligations		80.0			71.6			29.0			23.3			16.9			48.3			269.1
Total contractual obligations	$	605.2		$	752.7		$	1,112.8		$	909.7		$	588.8		$	10,980.7		$	14,949.9

Off-Balance Sheet Commitments

Off-Balance Sheet Commitments - Our total unrecorded commitments associated with outstanding letters of credit, and financial guarantees as of June 30, 2024 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2024		2025		2026		2027		2028		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	23.7	$	23.7
Financial guarantees		1.0		—		—		—		—		—		1.0
Total commitments	$	1.0	$	—	$	—	$	—	$	—	$	23.7	$	24.7

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Supplemental Disclosures of Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2024

Cash and Cash Equivalents [Abstract]

Supplemental Disclosures of Cash Flow Information

	Six-month period ended June 30,
Supplemental disclosures of cash flow information (in millions):	2024		2023
Interest paid	$	162.1	$	127.3
Income taxes paid, net		167.8		116.7

Summary of Cash, Cash Equivalents, Restricted Cash and Fiduciary Cash

The following is a reconciliation of our end of period cash, cash equivalents, restricted cash and fiduciary cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2024 and 2023 (in millions):

	June 30,
	2024		2023
Cash and cash equivalents - non-restricted cash	$	1,219.2	$	777.9
Cash and cash equivalents - restricted cash		196.1		174.4
Total cash and cash equivalents		1,415.3		952.3
Fiduciary cash		5,422.5		5,989.9
Total cash, cash equivalents, restricted cash and fiduciary cash	$	6,837.8	$	6,942.2

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Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss Attributable to Controlling Interests

The after-tax components of our accumulated other comprehensive loss attributable to controlling interests consist of the following (in millions):

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2023	$	(37.1	)	$	(867.4	)	$	112.4		$	(792.1	)
Net change in period		0.2			(144.5	)		(2.8	)		(147.1	)
Balance as of June 30, 2024	$	(36.9	)	$	(1,011.9	)	$	109.6		$	(939.2	)

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2024

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Financial information relating to our segments for the three and six-month periods ended June 30, 2024 and 2023 as follows

(in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2024			2023			2024			2023
Brokerage
Total revenues	$	2,376.3		$	2,088.4		$	5,241.2		$	4,463.6
Earnings before income taxes	$	446.3		$	390.5		$	1,322.4		$	1,081.4
Identifiable assets at June 30, 2024 and 2023							$	58,776.7		$	50,623.8
Risk Management
Total revenues	$	398.0		$	353.6		$	789.4		$	684.4
Earnings before income taxes	$	65.4		$	49.9		$	118.6		$	95.4
Identifiable assets at June 30, 2024 and 2023							$	1,683.4		$	1,212.8
Corporate
Total revenues	$	1.1		$	(0.1	)	$	1.5		$	—
Loss before income taxes	$	(146.1	)	$	(143.0	)	$	(302.7	)	$	(273.6	)
Identifiable assets at June 30, 2024 and 2023							$	2,547.6		$	2,528.6
Total
Total revenues	$	2,775.4		$	2,441.9		$	6,032.1		$	5,148.0
Earnings before income taxes	$	365.6		$	297.4		$	1,138.3		$	903.2
Identifiable assets at June 30, 2024 and 2023							$	63,007.7		$	54,365.2

Summary of Revenues by Type and Segment

Revenues by type and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,661.8	$	—	$	—	$	1,661.8
Fees		477.6		349.5		—		827.1
Supplemental revenues		88.7		—		—		88.7
Contingent revenues		59.8		—		—		59.8
Interest income, premium finance revenues and other income		88.4		9.1		1.1		98.6
Revenues before reimbursements		2,376.3		358.6		1.1		2,736.0
Reimbursements		—		39.4		—		39.4
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

Revenues by type and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,655.4	$	—	$	—	$	3,655.4
Fees		1,084.3		694.0		—		1,778.3
Supplemental revenues		182.6		—		—		182.6
Contingent revenues		145.8		—		—		145.8
Interest income, premium finance revenues and other income		173.1		17.4		1.5		192.0
Revenues before reimbursements		5,241.2		711.4		1.5		5,954.1
Reimbursements		—		78.0		—		78.0
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by type and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
Commissions	$	1,410.4	$	—	$	—		$	1,410.4
Fees		478.5		312.0		—			790.5
Supplemental revenues		71.2		—		—			71.2
Contingent revenues		54.2		—		—			54.2
Interest income, premium finance revenues and other income		74.1		6.6		(0.1	)		80.6
Revenues before reimbursements		2,088.4		318.6		(0.1	)		2,406.9
Reimbursements		—		35.0		—			35.0
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

Revenues by type and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	3,157.8	$	—	$	—	$	3,157.8
Fees		891.2		605.0		—		1,496.2
Supplemental revenues		152.8		—		—		152.8
Contingent revenues		126.0		—		—		126.0
Interest income, premium finance revenues and other income		135.8		11.2		—		147.0
Revenues before reimbursements		4,463.6		616.2		—		5,079.8
Reimbursements		—		68.2		—		68.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

Summary of Geographical Location and Segment

Revenues by geographical location and segment for the three-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,394.6	$	324.2	$	1.1	$	1,719.9
United Kingdom		574.6		14.0		—		588.6
Australia		90.9		56.0		—		146.9
Canada		110.3		1.7		—		112.0
New Zealand		55.9		2.1		—		58.0
Other foreign		150.0		—		—		150.0
Total revenues	$	2,376.3	$	398.0	$	1.1	$	2,775.4

Revenues by geographical location and segment for the six-month period ended June 30, 2024 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	3,208.6	$	644.7	$	1.5	$	3,854.8
United Kingdom		1,159.4		28.0		—		1,187.4
Australia		158.9		109.0		—		267.9
Canada		213.4		3.4		—		216.8
New Zealand		97.6		4.3		—		101.9
Other foreign		403.3		—		—		403.3
Total revenues	$	5,241.2	$	789.4	$	1.5	$	6,032.1

Revenues by geographical location and segment for the three-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate			Total
Revenues:
United States	$	1,199.7	$	298.7	$	(0.1	)	$	1,498.3
United Kingdom		527.6		11.6		—			539.2
Australia		83.8		37.5		—			121.3
Canada		104.6		1.5		—			106.1
New Zealand		53.0		4.3		—			57.3
Other foreign		119.7		—		—			119.7
Total revenues	$	2,088.4	$	353.6	$	(0.1	)	$	2,441.9

Revenues by geographical location and segment for the six-month period ended June 30, 2023 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	2,675.0	$	578.8	$	—	$	3,253.8
United Kingdom		1,041.1		22.9		—		1,064.0
Australia		148.0		71.5		—		219.5
Canada		198.3		3.0		—		201.3
New Zealand		91.0		8.2		—		99.2
Other foreign		310.2		—		—		310.2
Total revenues	$	4,463.6	$	684.4	$	—	$	5,148.0

XML

Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2024 Country Segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | Segment	3
Number of countries in which the company does business through a network of correspondent brokers and consultants | Country	130

XML

Business Combinations - Acquisition Method for Recording Business Combinations (Detail) shares in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) shares
Ericson Insurance Services [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	129
Common Share Value	$ 30,100,000
Cash Paid	26,500,000
Escrow Deposited	3,000,000
Recorded Earnout Payable	7,000,000
Total Recorded Purchase Price	66,600,000
Maximum Potential Earnout Payable	10,000,000
The Rowley Agency [Member]
Business Acquisition [Line Items]
Cash Paid	117,200,000
Escrow Deposited	11,000,000
Total Recorded Purchase Price	128,200,000
OperationsInc [Member]
Business Acquisition [Line Items]
Cash Paid	52,600,000
Escrow Deposited	2,800,000
Recorded Earnout Payable	11,000,000
Total Recorded Purchase Price	66,400,000
Maximum Potential Earnout Payable	$ 20,000,000
Twenty-One Other Acquisitions [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	229
Common Share Value	$ 48,800,000
Cash Paid	271,300,000
Accrued Liability	2,600,000
Escrow Deposited	16,800,000
Recorded Earnout Payable	53,300,000
Total Recorded Purchase Price	392,800,000
Maximum Potential Earnout Payable	$ 108,500,000
2024 Acquisitions [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	358
Common Share Value	$ 78,900,000
Cash Paid	467,600,000
Accrued Liability	2,600,000
Escrow Deposited	33,600,000
Recorded Earnout Payable	71,300,000
Total Recorded Purchase Price	654,000,000
Maximum Potential Earnout Payable	$ 138,500,000

XML

Business Combinations - Additional Information (Detail) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended	270 Months Ended
	Jun. 30, 2024 USD ($) Entity	Jun. 30, 2023 USD ($) Entity	Jun. 30, 2024 USD ($) Entity	Jun. 30, 2023 USD ($) Entity	Dec. 31, 2023 USD ($)	Jun. 30, 2024 USD ($) Entity
Business Acquisition [Line Items]
Accretion of the discount on acquisition	$ 15.0	$ 19.8	$ 33.8	$ 39.6
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations	$ (3.8)	$ 10.4	$ 31.1	$ (11.6)
Number of companies acquired | Entity	30	34	58	45		725
Aggregate amount of maximum earnout obligations related to acquisitions			$ 1,925.8
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet			1,236.7
Aggregate amount of earnout obligation expected settlement in cash or stock at option	$ 491.8		491.8			$ 491.8
Aggregate amount of earnout obligation expected settlement in cash	744.9		744.9			744.9
Goodwill	341.0		341.0			341.0
Expiration lists	300.9		300.9			300.9
Non-compete agreements	7.5		7.5			7.5
Trade names	0.3		0.3			0.3
Net increase to goodwill			196.4		$ 256.7
Total revenues	2,785.4	$ 2,478.5	6,061.9	$ 5,223.0
Brokerage and Risk Management [Member]
Business Acquisition [Line Items]
Write-off of amortizable intangible assets		$ 3.1		$ 3.2
Brokerage [Member]
Business Acquisition [Line Items]
Net increase to goodwill			94.4
Write-off of amortizable intangible assets	14.0		14.0
Brokerage [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes	52.1		52.1			52.1
Brokerage [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes	4.1		4.1			4.1
Brokerage [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes	$ 0.3		$ 0.3			$ 0.3
Minimum [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	2 years		2 years			2 years
Minimum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	2 years		2 years			2 years
Minimum [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	2 years		2 years			2 years
Maximum [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	15 years		15 years			15 years
Maximum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	6 years		6 years			6 years
Maximum [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years	15 years		15 years			15 years
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input	0.05		0.05			0.05
2024 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input	0.15		0.15			0.15
2024 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member]
Business Acquisition [Line Items]
Measurement input	0.09		0.09			0.09
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input	0.007		0.007			0.007
2023 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input	0.053		0.053			0.053
2023 Acquisitions [Member] | Valuation, Income Approach | Minimum [Member]
Business Acquisition [Line Items]
Attrition rate			5.00%
2023 Acquisitions [Member] | Valuation, Income Approach | Maximum [Member]
Business Acquisition [Line Items]
Attrition rate			11.00%
2023 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input	0.095		0.095			0.095
2023 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input	0.11		0.11			0.11
Business Acquisition [Member]
Business Acquisition [Line Items]
Annualized revenue of business acquisitions			$ 141.2
Total revenues			42.8
Net earnings			(5.0)
Net earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earnout payables			7.4
Business Acquisition [Member] | Brokerage [Member]
Business Acquisition [Line Items]
Expiration lists	$ 300.9		300.9			$ 300.9
Non-compete agreements	7.5		7.5			7.5
Trade names	0.3		0.3			0.3
Deferred tax liability	$ 13.1		$ 13.1			$ 13.1

XML

Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail) $ in Millions	Jun. 30, 2024 USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and cash equivalents	$ 14.9
Fiduciary assets	37.7
Other current assets	18.0
Fixed assets	1.1
Noncurrent assets	7.6
Goodwill	341.0
Expiration lists	300.9
Non-compete agreements	7.5
Trade names	0.3
Total assets acquired	729.0
Fiduciary liabilities	37.7
Current liabilities	17.2
Noncurrent liabilities	20.1
Total liabilities assumed	75.0
Total net assets acquired	654.0
Ericson Insurance Services [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and cash equivalents	0.1
Fiduciary assets	1.0
Other current assets	3.5
Noncurrent assets	0.1
Goodwill	27.4
Expiration lists	35.9
Non-compete agreements	0.5
Total assets acquired	68.5
Fiduciary liabilities	1.0
Current liabilities	0.8
Noncurrent liabilities	0.1
Total liabilities assumed	1.9
Total net assets acquired	66.6
The Rowley Agency [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and cash equivalents	4.1
Fiduciary assets	2.6
Other current assets	0.5
Fixed assets	0.4
Noncurrent assets	1.7
Goodwill	65.8
Expiration lists	57.4
Non-compete agreements	0.6
Total assets acquired	133.1
Fiduciary liabilities	2.6
Current liabilities	0.6
Noncurrent liabilities	1.7
Total liabilities assumed	4.9
Total net assets acquired	128.2
OPR [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and cash equivalents	0.8
Fiduciary assets	0.0
Other current assets	2.7
Fixed assets	0.0
Noncurrent assets	2.0
Goodwill	41.9
Expiration lists	22.1
Non-compete agreements	0.2
Total assets acquired	69.7
Fiduciary liabilities	0.0
Current liabilities	1.1
Noncurrent liabilities	2.2
Total liabilities assumed	3.3
Total net assets acquired	66.4
Twenty One Other Acquisitions [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and cash equivalents	9.9
Fiduciary assets	34.1
Other current assets	11.3
Fixed assets	0.7
Noncurrent assets	3.8
Goodwill	205.9
Expiration lists	185.5
Non-compete agreements	6.2
Trade names	0.3
Total assets acquired	457.7
Fiduciary liabilities	34.1
Current liabilities	14.7
Noncurrent liabilities	16.1
Total liabilities assumed	64.9
Total net assets acquired	$ 392.8

XML

Business Combinations - Summary of Unaudited Pro Forma Historical Results (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Business Combinations [Abstract]
Total revenues	$ 2,785.4	$ 2,478.5	$ 6,061.9	$ 5,223.0
Net earnings attributable to controlling interests	$ 283.9	$ 235.8	$ 893.7	$ 724.9
Basic net earnings per share	$ 1.3	$ 1.1	$ 4.1	$ 3.38
Diluted net earnings per share	$ 1.27	$ 1.07	$ 4.02	$ 3.32

XML

Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Unbilled receivables	$ 1,536.6	$ 1,093.7
Deferred contract costs	123.0	169.1
Deferred revenue	$ 762.9	$ 706.2

XML

Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	$ 706.2
Incremental deferred revenue	463.0
Revenue recognized during the six-month period ended June 30, 2024 included in deferred revenue at December 31, 2023	(385.6)
Net change in collected billings/deposits received from customers	(23.7)
Impact of change in foreign exchange rates	(2.3)
Deferred revenue recognized from business acquisitions	5.3
Deferred revenue ending balance	762.9
Brokerage [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	533.6
Incremental deferred revenue	417.5
Revenue recognized during the six-month period ended June 30, 2024 included in deferred revenue at December 31, 2023	(343.5)
Net change in collected billings/deposits received from customers	(22.8)
Impact of change in foreign exchange rates	(2.2)
Deferred revenue recognized from business acquisitions	5.3
Deferred revenue ending balance	587.9
Risk Management [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	172.6
Incremental deferred revenue	45.5
Revenue recognized during the six-month period ended June 30, 2024 included in deferred revenue at December 31, 2023	(42.1)
Net change in collected billings/deposits received from customers	(0.9)
Impact of change in foreign exchange rates	(0.1)
Deferred revenue ending balance	$ 175.0

XML

Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	$ 762.9
Deferred contract costs	123.0	$ 169.1
Amortization of deferred contract costs	$ 362.9		$ 306.7

XML

Contracts with Customers - Summary of Expected Revenue Related to Performance Obligations (Detail) $ in Millions	Jun. 30, 2024 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 762.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 591.3
Remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 103.1
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 34.2
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 14.0
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 7.3
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 13.0
Remaining performance obligation, expected timing of satisfaction, period
Brokerage [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 587.9
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 504.9
Remaining performance obligation, expected timing of satisfaction, period	6 months
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 64.2
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 16.8
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 1.0
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 0.5
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 0.5
Remaining performance obligation, expected timing of satisfaction, period
Risk Management [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 175.0
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 86.4
Remaining performance obligation, expected timing of satisfaction, period	6 months
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 38.9
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 17.4
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 13.0
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 6.8
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2029-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 12.5
Remaining performance obligation, expected timing of satisfaction, period

XML

Contracts with Customers - Summary of Expected Revenue Related to Performance Obligations 1 (Detail) $ in Millions	Jun. 30, 2024 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 762.9
Brokerage [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	587.9
Risk Management [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 175.0

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Intangible Assets - Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Total goodwill	$ 11,915.5	$ 11,475.6
Unites States [Member]
Goodwill [Line Items]
Total goodwill	6,726.5	6,379.3
United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	2,521.5	2,511.9
Canada [Member]
Goodwill [Line Items]
Total goodwill	606.8	623.7
Australia [Member]
Goodwill [Line Items]
Total goodwill	757.1	650.5
New Zealand [Member]
Goodwill [Line Items]
Total goodwill	206.2	213.8
Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	1,097.4	1,096.4
Brokerage [Member]
Goodwill [Line Items]
Total goodwill	11,559.7	11,217.8
Risk Management [Member]
Goodwill [Line Items]
Total goodwill	336.9	238.8
Corporate [Member]
Goodwill [Line Items]
Total goodwill	18.9	19.0
Operating Segments [Member] | Brokerage [Member]
Goodwill [Line Items]
Total goodwill	11,559.7	11,217.8
Operating Segments [Member] | Brokerage [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill	6,651.7	6,304.5
Operating Segments [Member] | Brokerage [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	2,503.1	2,493.4
Operating Segments [Member] | Brokerage [Member] | Canada [Member]
Goodwill [Line Items]
Total goodwill	606.8	623.7
Operating Segments [Member] | Brokerage [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill	522.6	514.6
Operating Segments [Member] | Brokerage [Member] | New Zealand [Member]
Goodwill [Line Items]
Total goodwill	197.0	204.2
Operating Segments [Member] | Brokerage [Member] | Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	1,078.5	1,077.4
Operating Segments [Member] | Risk Management [Member]
Goodwill [Line Items]
Total goodwill	336.9	238.8
Operating Segments [Member] | Risk Management [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill	74.8	74.8
Operating Segments [Member] | Risk Management [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	18.4	18.5
Operating Segments [Member] | Risk Management [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill	234.5	135.9
Operating Segments [Member] | Risk Management [Member] | New Zealand [Member]
Goodwill [Line Items]
Total goodwill	9.2	9.6
Operating Segments [Member] | Corporate [Member]
Goodwill [Line Items]
Total goodwill	18.9	19.0
Operating Segments [Member] | Corporate [Member] | Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	$ 18.9	$ 19.0

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Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Beginning Balance	$ 11,475.6
Goodwill acquired during the period	341.0
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3)	196.4	$ 256.7
Goodwill written-off related to sales of business and impairment	(5.8)
Foreign currency translation adjustments during the period	(91.7)
Ending Balance	11,915.5	11,475.6
Brokerage [Member]
Goodwill [Line Items]
Beginning Balance	11,217.8
Goodwill acquired during the period	341.0
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3)	94.4
Goodwill written-off related to sales of business and impairment	(5.8)
Foreign currency translation adjustments during the period	(87.7)
Ending Balance	11,559.7	11,217.8
Risk Management [Member]
Goodwill [Line Items]
Beginning Balance	238.8
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3)	102.0
Foreign currency translation adjustments during the period	(3.9)
Ending Balance	336.9	238.8
Corporate [Member]
Goodwill [Line Items]
Beginning Balance	19.0
Foreign currency translation adjustments during the period	(0.1)
Ending Balance	$ 18.9	$ 19.0

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Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, net	$ 4,389.4	$ 4,633.3
Expiration Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	8,341.8	8,222.8
Accumulated amortization	(4,025.8)	(3,733.2)
Amortizable intangible assets, net	4,316.0	4,489.6
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	103.3	112.2
Accumulated amortization	(79.9)	(74.9)
Amortizable intangible assets, net	23.4	37.3
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	119.7	171.8
Accumulated amortization	(69.7)	(65.4)
Amortizable intangible assets, net	$ 50.0	$ 106.4

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Intangible Assets - Estimated Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
2024 (remaining three months)	$ 310.1
2025	587.5
2026	544.3
2027	510.5
2028	470.1
Thereafter	1,966.9
Amortizable intangible assets, net	$ 4,389.4	$ 4,633.3

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Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 8,360.8	$ 8,032.0
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements	(46.8)	(38.4)
Less unamortized discount on Bonds Payable	(35.3)	(28.6)
Semi-annual payments of interest, Net	8,278.7	7,965.0
Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	3,523.0	3,948.0
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	4,550.0	3,550.0
Fixed Rate of 2.40%, Balloon Due November 9, 2031 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	400.0	400.0
Fixed Rate of 5.50%, Balloon Due March 2, 2033 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	350.0	350.0
Fixed Rate of 6.50%, Balloon due February 15, 2034 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	400.0	400.0
Fixed Rate of 5.45%, Balloon Due July 15, 2034 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	500.0
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	850.0	850.0
Fixed Rate of 3.05%, Balloon Due March 9, 2052 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	350.0	350.0
Fixed Rate of 5.75%, Balloon Due March 2, 2053 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	600.0	600.0
Fixed Rate of 6.75%, Balloon Due February 15, 2054 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	600.0	600.0
Fixed Rate of 5.75%, Balloon Due July 15, 2054 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	500.0
Fixed Rate of 4.72%, Balloon due February 13, 2024 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest		100.0
Fixed Rate of 4.58%, Balloon Due February 27, 2024 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest		325.0
Fixed Rate of 4.31%, Balloon Due June 24, 2025 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200.0	200.0
Fixed Rate of 4.85%, Balloon due February 13, 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	140.0	140.0
Fixed Rate of 4.73%, Balloon Due February 27, 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	175.0	175.0
Fixed Rate of 4.40%, Balloon Due June 2, 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	175.0	175.0
Fixed Rate of 4.36%, Balloon Due June 24, 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	150.0	150.0
Fixed Rate of 3.75%, Balloon Due January 30, 2027 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	30.0	30.0
Fixed Rate of 4.09%, Balloon Due June 27, 2027 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	125.0	125.0
Fixed Rate of 4.09%, Balloon Due August 2, 2027 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	125.0	125.0
Fixed Rate of 4.14%, Balloon Due August 4, 2027 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	98.0	98.0
Fixed Rate of 3.46%, Balloon Due December 1, 2027 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	100.0	100.0
Fixed Rate of 4.55%, Balloon Due June 2, 2028 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75.0	75.0
Fixed Rate of 4.34%, Balloon due June 13, 2028 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	125.0	125.0
Fixed Rate of 5.04%, Balloon due February 13, 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	100.0	100.0
Fixed Rate of 4.98%, Balloon Due February 27, 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	100.0	100.0
Fixed Rate of 4.19%, Balloon Due June 27, 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50.0	50.0
Fixed Rate of 4.19%, Balloon Due August 2, 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50.0	50.0
Fixed Rate of 3.48%, Balloon Due December 2, 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50.0	50.0
Fixed Rate of 3.99%, Balloon Due January 30, 2030 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	341.0	341.0
Fixed Rate of 4.44%, Balloon Due June 13, 2030 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	125.0	125.0
Fixed Rate of 5.14%, Balloon due March 13, 2031 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	180.0	180.0
Fixed Rate of 4.70%, Balloon Due June 2, 2031 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	25.0	25.0
Fixed Rate of 4.09%, Balloon Due January 30, 2032 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	69.0	69.0
Fixed Rate of 4.34%, Balloon Due June 27, 2032 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75.0	75.0
Fixed Rate of 4.34%, Balloon Due August 2, 2032 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75.0	75.0
Fixed Rate of 4.59%, Balloon due June 13, 2033 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	125.0	125.0
Fixed Rate of 5.29%, balloon due March 13, 2034 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	40.0	40.0
Fixed Rate of 4.48%, Balloon Due June 12, 2034 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	175.0	175.0
Fixed Rate of 4.24%, Balloon Due January 30, 2035 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	79.0	79.0
Fixed Rate of 2.44%, Balloon Due February 10, 2036 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	100.0	100.0
Fixed Rate of 2.46%, Balloon Due May 5, 2036 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75.0	75.0
Fixed Rate of 4.69%, Balloon Due June 13, 2038 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75.0	75.0
Fixed Rate of 5.45%, balloon due March 13, 2039 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	40.0	40.0
Fixed Rate of 4.49%, Balloon Due January 30, 2040 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	56.0	56.0
Prime or SOFR Plus up to 1.075%, Expires June 22, 2028 [Member] | Unsecured Multicurrency Credit Agreement [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	80.0	245.0
Interbank rates plus 1.500% Expires October 31, 2025 [Member] | AUD Denominated Tranche [Member] | Facility B [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	199.6	249.0
Interbank Rates Plus 0.830% Expires October 31, 2025 [Member] | AUD Denominated Tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest		31.4
Interbank Rates Plus 0.990% Expires October 31, 2025 [Member] | NZD Denominated Tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	8.2	8.6
Interbank Rates Expires October 31, 2025 [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 207.8	$ 289.0

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Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Periodic payments of interest and principal, expiry date	Oct. 31, 2025	Oct. 31, 2025
Fixed Rate of 2.40%, Balloon Due November 9, 2031 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	2.40%	2.40%
Periodic payments of interest and principal, expiry date	Nov. 09, 2031	Nov. 09, 2031
Fixed Rate of 5.50%, Balloon Due March 2, 2033 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.50%	5.50%
Periodic payments of interest and principal, expiry date	Mar. 02, 2033	Mar. 02, 2033
Fixed Rate of 6.50%, Balloon due February 15, 2034 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	6.50%	6.50%
Periodic payments of interest and principal, expiry date	Feb. 15, 2034	Feb. 15, 2034
Fixed Rate of 5.45%, Balloon Due July 15, 2034 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.45%	5.45%
Periodic payments of interest and principal, expiry date	Jul. 15, 2034	Jul. 15, 2034
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.50%	3.50%
Periodic payments of interest and principal, expiry date	May 20, 2051	May 20, 2051
Fixed Rate of 3.05%, Balloon Due March 9, 2052 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.05%	3.05%
Periodic payments of interest and principal, expiry date	Mar. 09, 2052	Mar. 09, 2052
Fixed Rate of 6.75%, Balloon Due February 15, 2054 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	6.75%	6.75%
Periodic payments of interest and principal, expiry date	Feb. 15, 2054	Feb. 15, 2054
Fixed Rate of 5.75%, Balloon Due July 15, 2054 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.75%	5.75%
Periodic payments of interest and principal, expiry date	Jul. 15, 2054	Jul. 15, 2054
Fixed Rate of 5.75%, Balloon Due March 2, 2053 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.75%	5.75%
Periodic payments of interest and principal, expiry date	Mar. 02, 2053	Mar. 02, 2053
Fixed Rate of 4.72%, Balloon due February 13, 2024 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.72%	4.72%
Periodic payments of interest and principal, expiry date	Feb. 13, 2024	Feb. 13, 2024
Fixed Rate of 4.58%, Balloon Due February 27, 2024 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.58%	4.58%
Periodic payments of interest and principal, expiry date	Feb. 27, 2024	Feb. 27, 2024
Fixed Rate of 4.31%, Balloon Due June 24, 2025 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.31%	4.31%
Periodic payments of interest and principal, expiry date	Jun. 24, 2025	Jun. 24, 2025
Fixed Rate of 4.85%, Balloon due February 13, 2026 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.85%	4.85%
Periodic payments of interest and principal, expiry date	Feb. 13, 2026	Feb. 13, 2026
Fixed Rate of 4.73%, Balloon Due February 27, 2026 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.73%	4.73%
Periodic payments of interest and principal, expiry date	Feb. 27, 2026	Feb. 27, 2026
Fixed Rate of 4.40%, Balloon Due June 2, 2026 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.40%	4.40%
Periodic payments of interest and principal, expiry date	Jun. 02, 2026	Jun. 02, 2026
Fixed Rate of 4.36%, Balloon Due June 24, 2026 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.36%	4.36%
Periodic payments of interest and principal, expiry date	Jun. 24, 2026	Jun. 24, 2026
Fixed Rate of 3.75%, Balloon Due January 30, 2027 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.75%	3.75%
Periodic payments of interest and principal, expiry date	Jan. 30, 2027	Jan. 30, 2027
Fixed Rate of 4.09%, Balloon Due June 27, 2027 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.09%	4.09%
Periodic payments of interest and principal, expiry date	Jun. 27, 2027	Jun. 27, 2027
Fixed Rate of 4.09%, Balloon Due August 2, 2027 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.09%	4.09%
Periodic payments of interest and principal, expiry date	Aug. 02, 2027	Aug. 02, 2027
Fixed Rate of 4.14%, Balloon Due August 4, 2027 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.14%	4.14%
Periodic payments of interest and principal, expiry date	Aug. 04, 2027	Aug. 04, 2027
Fixed Rate of 3.46%, Balloon Due December 1, 2027 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.46%	3.46%
Periodic payments of interest and principal, expiry date	Dec. 01, 2027	Dec. 01, 2027
Fixed Rate of 4.55%, Balloon Due June 2, 2028 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.55%	4.55%
Periodic payments of interest and principal, expiry date	Jun. 02, 2028	Jun. 02, 2028
Fixed Rate of 4.34%, Balloon due June 13, 2028 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.34%	4.34%
Periodic payments of interest and principal, expiry date	Jun. 13, 2028	Jun. 13, 2028
Fixed Rate of 5.04%, Balloon due February 13, 2029 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.04%	5.04%
Periodic payments of interest and principal, expiry date	Feb. 13, 2029	Feb. 13, 2029
Fixed Rate of 4.98%, Balloon Due February 27, 2029 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.98%	4.98%
Periodic payments of interest and principal, expiry date	Feb. 27, 2029	Feb. 27, 2029
Fixed Rate of 4.19%, Balloon Due June 27, 2029 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.19%	4.19%
Periodic payments of interest and principal, expiry date	Jun. 27, 2029	Jun. 27, 2029
Fixed Rate of 4.19%, Balloon Due August 2, 2029 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.19%	4.19%
Periodic payments of interest and principal, expiry date	Aug. 02, 2029	Aug. 02, 2029
Fixed Rate of 3.48%, Balloon Due December 2, 2029 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.48%	3.48%
Periodic payments of interest and principal, expiry date	Dec. 02, 2029	Dec. 02, 2029
Fixed Rate of 3.99%, Balloon Due January 30, 2030 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	3.99%	3.99%
Periodic payments of interest and principal, expiry date	Jan. 30, 2030	Jan. 30, 2030
Fixed Rate of 4.44%, Balloon Due June 13, 2030 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.44%	4.44%
Periodic payments of interest and principal, expiry date	Jun. 13, 2030	Jun. 13, 2030
Fixed Rate of 5.14%, Balloon due March 13, 2031 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.14%	5.14%
Periodic payments of interest and principal, expiry date	Mar. 13, 2031	Mar. 13, 2031
Fixed Rate of 4.70%, Balloon Due June 2, 2031 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.70%	4.70%
Periodic payments of interest and principal, expiry date	Jun. 02, 2031	Jun. 02, 2031
Fixed Rate of 4.09%, Balloon Due January 30, 2032 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.09%	4.09%
Periodic payments of interest and principal, expiry date	Jan. 30, 2032	Jan. 30, 2032
Fixed Rate of 4.34%, Balloon Due June 27, 2032 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.34%	4.34%
Periodic payments of interest and principal, expiry date	Jun. 27, 2032	Jun. 27, 2032
Fixed Rate of 4.34%, Balloon Due August 2, 2032 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.34%	4.34%
Periodic payments of interest and principal, expiry date	Aug. 02, 2032	Aug. 02, 2032
Fixed Rate of 4.59%, Balloon due June 13, 2033 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.59%	4.59%
Periodic payments of interest and principal, expiry date	Jun. 13, 2033	Jun. 13, 2033
Fixed Rate of 5.29%, balloon due March 13, 2034 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.29%	5.29%
Periodic payments of interest and principal, expiry date	Mar. 13, 2034	Mar. 13, 2034
Fixed Rate of 4.48%, Balloon Due June 12, 2034 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.48%	4.48%
Periodic payments of interest and principal, expiry date	Jun. 12, 2034	Jun. 12, 2034
Fixed Rate of 4.24%, Balloon Due January 30, 2035 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.24%	4.24%
Periodic payments of interest and principal, expiry date	Jan. 30, 2035	Jan. 30, 2035
Fixed Rate of 2.44%, Balloon Due February 10, 2036 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	2.44%	2.44%
Periodic payments of interest and principal, expiry date	Feb. 10, 2036	Feb. 10, 2036
Fixed Rate of 2.46%, Balloon Due May 5, 2036 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	2.46%	2.46%
Periodic payments of interest and principal, expiry date	May 05, 2036	May 05, 2036
Fixed Rate of 4.69%, Balloon Due June 13, 2038 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.69%	4.69%
Periodic payments of interest and principal, expiry date	Jun. 13, 2038	Jun. 13, 2038
Fixed Rate of 5.45%, balloon due March 13, 2039 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	5.45%	5.45%
Periodic payments of interest and principal, expiry date	Mar. 13, 2039	Mar. 13, 2039
Fixed Rate of 4.49%, Balloon Due January 30, 2040 [Member]
Debt Instrument [Line Items]
Periodic payment of interest	4.49%	4.49%
Periodic payments of interest and principal, expiry date	Jan. 30, 2040	Jan. 30, 2040
Prime or SOFR Plus up to 1.075%, Expires June 22, 2028 [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Periodic payment of interest	1.075%	1.075%
Periodic payments of interest and principal, expiry date	Jun. 22, 2028	Jun. 22, 2028
Facility B [Member] | Interbank rates plus 1.500% Expires October 31, 2025 [Member] | Premium Financing Debt Facility [Member] | AUD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic payment of interest	1.50%	1.50%
Facility B [Member] | Interbank Rates Plus 1.850% Expires October 31, 2025 [Member] | Premium Financing Debt Facility [Member] | NZD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic payment of interest	1.85%	1.85%
Facility C and D [Member] | Interbank Rates Plus 0.830% Expires October 31, 2025 [Member] | Premium Financing Debt Facility [Member] | AUD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic payment of interest	0.83%	0.83%
Facility C and D [Member] | Interbank Rates Plus 0.990% Expires October 31, 2025 [Member] | Premium Financing Debt Facility [Member] | NZD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic payment of interest	0.99%	0.99%

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Credit and Other Debt Agreements - Additional Information (Detail) - USD ($) $ in Millions	Feb. 12, 2024	Jun. 30, 2024	Dec. 31, 2023
Fixed Rate of 5.45%, Balloon Due July 15, 2034 [Member]
Debt Instrument [Line Items]
Periodic payment of interest		5.45%	5.45%
Fixed Rate of 5.75%, Balloon Due July 15, 2054 [Member]
Debt Instrument [Line Items]
Periodic payment of interest		5.75%	5.75%
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 1,000.0
Weighted average interest rate	5.71%
Realized a cash gain (loss) on hedging transaction	$ 1.4
Derivative instrument, term	10 years
Unsecured Senior Notes [Member] | Fixed Rate of 5.45%, Balloon Due July 15, 2034 [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 500.0
Periodic payment of interest	5.45%
Periodic payments of interest and principal, expiry year	2034
Unsecured Senior Notes [Member] | Fixed Rate of 5.75%, Balloon Due July 15, 2054 [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 500.0
Periodic payment of interest	5.75%
Periodic payments of interest and principal, expiry year	2054

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Earnings Per Share - Computation of Basic and Diluted Net EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 283.4	$ 234.5	$ 891.8	$ 721.0
Weighted average number of common shares outstanding	218.8	214.9	218.1	213.8
Dilutive effect of stock options using the treasury stock method	4.1	4.1	4.3	4.2
Weighted average number of common and common equivalent shares outstanding	222.9	219.0	222.4	218.0
Basic net earnings per share	$ 1.3	$ 1.09	$ 4.09	$ 3.37
Diluted net earnings per share	$ 1.27	$ 1.07	$ 4.01	$ 3.31

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Earnings Per Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Anti-dilutive stock-based awards shares outstanding	1.0	1.1	0.7	0.7

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Stock Option Plans - Additional information (Detail) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended				6 Months Ended
	Mar. 01, 2024	Mar. 15, 2023	May 10, 2022	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Stock Option Plans [Line Items]
Compensation expense related to stock option grants				$ 10.5	$ 15.1	$ 7.8	$ 7.7	$ 25.6	$ 15.5
Total intrinsic value of options exercised								173.7	$ 123.8
Total unrecognized compensation cost related to nonvested options				$ 149.9				$ 149.9
Weighted average period, years								4 years
Black-Scholes Option Pricing Model [Member]
Stock Option Plans [Line Items]
Weighted average fair value per option for all options								$ 69.55	$ 46.48
Long Term Incentive Plan [Member]
Stock Option Plans [Line Items]
Stock option granted, Share pool			13,500,000
Shares against the pool			3.8
Maximum number of shares available			3,500,000					2,500,000
Number Of Periods Options Expire								7 years
Shares available for grant				10,900,000				10,900,000
Long Term Incentive Plan [Member] | Officer and Key Employees [Member]
Stock Option Plans [Line Items]
Shares available for grant	1,044,000	1,131,000
Stock options granted, exercise percentage, on the third anniversary date of the grant	34.00%	34.00%
Stock options granted, exercise percentage, on the fourth anniversary date of the grant	33.00%	33.00%
Stock options granted, exercise percentage, on the fifth anniversary date of the grant	33.00%	33.00%
Long Term Incentive Plan [Member] | Maximum [Member]
Stock Option Plans [Line Items]
Minimum exercise price of stock options, percent of fair market value of a share of common stock on the date of grant								100.00%
Maximum period for the exercise of stock options, years								7 years	7 years
Long Term Incentive Plan [Member] | Minimum [Member]
Stock Option Plans [Line Items]
Period of service from grant date stock options awarded not subject to forfeiture		2 years							2 years
Long Term Incentive Plan [Member] | Minimum [Member] | Executive Officer [Member]
Stock Option Plans [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance								62 years	55 years

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Stock Option Plans - Black-Scholes Option Pricing Model with Weighted Average (Detail)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]
Expected dividend yield	1.00%	1.20%
Expected risk-free interest rate	4.20%	3.60%
Volatility	25.30%	25.00%
Expected life (in years)	5 years 6 months	5 years 4 months 24 days

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Stock Option Plans - Stock Option Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]
Shares Under Option, Beginning balance	7.9
Shares Under Option, Granted	1.0
Shares Under Option, Exercised	(1.0)
Shares Under Option, Forfeited or canceled	(0.1)
Shares Under Option, Ending balance	7.8
Shares Under Option, Exercisable at end of period	2.1
Shares Under Option, Ending unvested and expected to vest	5.2
Weighted Average Exercise Price, Beginning balance	$ 123.85
Weighted Average Exercise Price, Granted	243.54
Weighted Average Exercise Price, Exercised	76.4
Weighted Average Exercise Price, Forfeited or canceled	151.05
Weighted Average Exercise Price, Ending balance	145.7
Weighted Average Exercise Price, Exercisable at end of period	88.79
Weighted Average Exercise Price, Ending unvested and expected to vest	$ 164.5
Weighted Average Remaining Contractual Term (in years), Ending balance	4 years 2 months 4 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year	2 years 2 months 8 days
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest	4 years 10 months 9 days
Aggregate Intrinsic Value, Ending Balance	$ 883.9
Aggregate Intrinsic Value, Exercisable at end of year	353.9
Aggregate Intrinsic Value, Ending unvested and expected to vest	$ 494.1

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Stock Option Plans - Stock Options Outstanding and Exercisable (Detail) - $ / shares shares in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 70.74
Range of Exercise Prices, maximum	$ 243.54
Option Outstanding, Number Outstanding	7.8
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 2 months 4 days
Option Outstanding, Weighted Average Exercise Price	$ 145.7	$ 123.85
Options Exercisable, Number Exercisable	2.1
Option Exercisable, Weighted Average Exercise Price	$ 88.79
Exercise Prices Range $ 70.74 - $ 70.74 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	70.74
Range of Exercise Prices, maximum	$ 70.74
Option Outstanding, Number Outstanding	0.4
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 70.74
Options Exercisable, Number Exercisable	0.4
Option Exercisable, Weighted Average Exercise Price	$ 70.74
Exercise Prices Range $ 79.59 - $ 79.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	79.59
Range of Exercise Prices, maximum	$ 79.59
Option Outstanding, Number Outstanding	0.7
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 8 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 79.59
Options Exercisable, Number Exercisable	0.7
Option Exercisable, Weighted Average Exercise Price	$ 79.59
Exercise Prices Range $ 86.17 - $ 86.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	86.17
Range of Exercise Prices, maximum	$ 86.17
Option Outstanding, Number Outstanding	1.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 8 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 86.17
Options Exercisable, Number Exercisable	0.6
Option Exercisable, Weighted Average Exercise Price	$ 86.17
Exercise Prices Range $ 127.90 - $ 127.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	127.9
Range of Exercise Prices, maximum	$ 127.9
Option Outstanding, Number Outstanding	1.4
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 127.9
Options Exercisable, Number Exercisable	0.4
Option Exercisable, Weighted Average Exercise Price	$ 127.9
Exercise Prices Range $ 156.85 - $ 156.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	156.85
Range of Exercise Prices, maximum	$ 156.85
Option Outstanding, Number Outstanding	1.0
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 7 months 2 days
Option Outstanding, Weighted Average Exercise Price	$ 156.85
Exercise Prices Range $ 158.56 - $ 161.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	158.56
Range of Exercise Prices, maximum	$ 161.14
Option Outstanding, Number Outstanding	1.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 19 days
Option Outstanding, Weighted Average Exercise Price	$ 158.65
Exercise Prices Range $ 177.09 - $ 202.13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	177.09
Range of Exercise Prices, maximum	$ 202.13
Option Outstanding, Number Outstanding	1.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 8 months 19 days
Option Outstanding, Weighted Average Exercise Price	$ 177.78
Exercise Prices Range $ 238.88 - $ 243.54 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	238.88
Range of Exercise Prices, maximum	$ 243.54
Option Outstanding, Number Outstanding	1.0
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 8 months 1 day
Option Outstanding, Weighted Average Exercise Price	$ 243.54

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Deferred Compensation - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Investments And Employee Deferred Compensation Plan [Line Items]
Deferred Equity Participation Plan, distributions to key executives, age					age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later.
Deferred Equity Participation Sub-plans, distributions requisite service description					we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65.
Deferred Equity Participation Sub-plans, distributions to key executives, age					age 65
Deferred Equity Participation Plan (DEPP) [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		$ 23.2		$ 25.1
Charge to compensation expenses related to awards	$ 5.6		$ 5.9		$ 9.6	$ 9.9
Unearned deferred compensation, value					$ 95.5		$ 81.1
Unearned deferred compensation, shares					2.3		2.2
Total intrinsic value of unvested equity based awards					$ 584.4		$ 504.9
Cash and equity awards with aggregate fair value vested and distributed to participants					17.9	9.4
Deferred Equity Participation Plan Sub Plans [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		2.3		3.0
Charge to compensation expenses related to awards	0.6		0.8		1.1	1.4
Distributions from the sub-plans					2.3	6.4
Deferred Cash Participation Plan (DCPP) [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		$ 8.1		$ 9.8
Charge to compensation expenses related to awards	$ 5.1		$ 4.2		9.9	8.0
Cash and equity awards with aggregate fair value vested and distributed to participants					$ 13.6	$ 19.5

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Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail) $ in Millions				3 Months Ended				6 Months Ended
	Mar. 01, 2024 USD ($) shares	Mar. 15, 2023 USD ($) shares	May 10, 2022 shares	Jun. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($) shares	Jun. 30, 2023 USD ($) shares	Mar. 31, 2023 USD ($) shares	Jun. 30, 2024 USD ($) TIME shares	Jun. 30, 2023 USD ($) shares	Dec. 31, 2023 shares	Mar. 31, 2022 shares	Mar. 15, 2022 USD ($) shares	Mar. 16, 2021 USD ($) shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding | shares				7,800,000				7,800,000		7,900,000
Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Performance awards period, years								1 year
Restricted Stock Units (RSUs) [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share based payment award vesting date					Mar. 01, 2029		Mar. 15, 2028
Restricted stock or unit expense				$ 14.1		$ 11.0		$ 27.0	$ 20.7
Unvested Restricted Stock [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Total intrinsic value				512.7		460.5		512.7	460.5
Equity awards with an aggregate fair value								93.3	62.0
Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Restricted stock or unit expense				5.6		3.8		10.6	8.5
Total intrinsic value				85.2		64.3		85.2	64.3
Equity awards with an aggregate fair value								$ 31.6	$ 28.9
Performance share awards approved, Fair value	$ 14.2	$ 10.3
Vesting period, years	3 years	3 years
Performance Shares [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance	62 years	62 years
2017 Performance Share Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional awards, terms								The 2024 and 2023 awards are subject to a three-year performance period that began on January 1, 2024 and 2023, respectively, and vest on the three-year anniversary of the date of grant (March 1, 2027 and March 15, 2026).
Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares								0	0
Cash Awards [Member] | Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional awards, terms								The ultimate award value will be equal to the trailing twelve-month price of our common stock, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date.
Vesting period, years								3 years
Provisional compensation cash awards approved for future grant by compensation committee, value												$ 19.9	$ 18.8
Provisional compensation cash award approved for future grant by compensation committee, units | shares												125,000	147,000
Ultimate award value, multiples of original value of the units, minimum | TIME								0.5
Ultimate award value, multiples of original value of the units, maximum | TIME								1.5
2022 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses				$ 3.3		3.1		$ 6.7	$ 5.7
2021 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares				129,000				129,000
Cash-based compensation awards, expenses						$ 3.2			$ 6.5
Cash award with aggregate fair value vested and distributed to participants								$ 25.4
Performance awards expiration date								Jan. 01, 2024
2021 Provisional Cash Awards [Member] | Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares											143,000
2020 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares						191,000			191,000
Cash award with aggregate fair value vested and distributed to participants									$ 24.7
Long Term Incentive Plan [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding, Value				$ 4.0				$ 4.0
Shares granted in the period | shares			3,500,000					2,500,000
Long Term Incentive Plan [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Period of service from grant date stock options awarded not subject to forfeiture		2 years							2 years
Long Term Incentive Plan [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance								62 years	55 years
Long Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares					345,000		378,000
Fair value of grants in period					$ 83.9		$ 67.0
Long Term Incentive Plan [Member] | Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares authorized | shares	58,000	58,000
Long Term Incentive Plan [Member] | Performance Shares [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance		55 years

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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Detail) - USD ($)		Jun. 30, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Notional Amount		$ 46,400,000	$ 217,800,000
Derivative Assets		15,000,000	18,100,000
Derivative Liabilities		6,700,000	13,600,000
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			150,000,000
Interest Rate Contracts [Member] | Accrued compensation and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities			5,700,000
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	[1]	46,400,000	67,800,000
Foreign Exchange Contracts [Member] | Other current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets	[1]	4,900,000	3,900,000
Foreign Exchange Contracts [Member] | Other noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets		10,100,000	14,200,000
Foreign Exchange Contracts [Member] | Accrued compensation and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	[1]	2,600,000	3,900,000
Foreign Exchange Contracts [Member] | Other noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities		$ 4,100,000	$ 4,000,000

[1] Included within foreign exchange contracts at June 30, 2024 were $819.3 million of call options, offset with $819.3 million of put options, and $3.0 million of buy forwards, offset with $49.4 million of sell forwards. Included within foreign exchange contracts at December 31, 2023 were $331.3 million of call options, offset with $331.3 million of put options, and $5.5 million of buy forwards, offset with $73.3 million of sell forwards.

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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Parenthetical) (Detail) - Foreign Exchange Contracts [Member] - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	$ 819.3	$ 331.3
Put Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	819.3	331.3
Forward Contracts [Member] | Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	49.4	73.3
Forward Contracts [Member] | Put Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	$ 3.0	$ 5.5

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Derivatives and Hedging Activity - Summary of Amounts of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	$ (4.0)	$ 31.7	$ (6.7)	$ 37.5
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		(2.1)	(1.0)	(3.0)	(1.5)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		0.4	0.7	0.9	1.7
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (0.3)	$ (0.3)	$ (0.6)	$ (0.6)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating	Interest Expense, Operating and Nonoperating
Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (1.0)	$ 0.2	$ (0.8)	$ 0.8
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax	Revenue from Contract with Customer, Excluding Assessed Tax
Interest expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	$ (3.6)	$ 18.9	$ (2.9)	$ 8.8
Commission revenue [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	(0.4)	12.8	(3.8)	28.7
Compensation expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		(0.4)	(0.5)	(0.9)	(1.0)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		$ 0.2	$ 0.4	$ 0.5	$ 1.0
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Labor and Related Expense	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Operating expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Earnings		$ (0.4)	$ (0.4)	$ (0.7)	$ (0.7)
Amount of Gain Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		$ 0.2	$ 0.3	$ 0.4	$ 0.7
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]		Operating Expenses	Operating Expenses	Operating Expenses	Operating Expenses

[1] For the three and six-month periods ended June 30, 2024, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of $0.1 million and a gain of $0.2 million, respectively. For the three and six-month periods ended June 30, 2023, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a gain of $0.3 million and $0.8 million, respectively.

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Derivatives and Hedging Activity - Summary of Amounts of Derivative Gains (Losses) Recognized In Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), foreign currency transaction and translation adjustment, net of tax	$ 11.4	$ (155.8)	$ 193.8	$ 33.2
Foreign Exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), foreign currency transaction and translation adjustment, net of tax	$ (0.1)		$ 0.3		$ 0.2	$ 0.8

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Derivatives and Hedging Activity - Additional Information (Detail) $ in Millions	12 Months Ended
	Jun. 30, 2025 USD ($)
Scenario, Forecast [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated pretax gain to be reclassified from accumulated other comprehensive loss into earnings	$ 13.0

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Jun. 30, 2024 USD ($)
Senior Notes [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, Thereafter	$ 4,550.0
Contractual Obligations, Payments Due by Period, Total	4,550.0
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2025	200.0
Contractual Obligations, Payments Due by Period, 2026	640.0
Contractual Obligations, Payments Due by Period, 2027	478.0
Contractual Obligations, Payments Due by Period, 2028	200.0
Contractual Obligations, Payments Due by Period, Thereafter	2,005.0
Contractual Obligations, Payments Due by Period, Total	3,523.0
Credit Agreement [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	80.0
Contractual Obligations, Payments Due by Period, Total	80.0
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	207.8
Contractual Obligations, Payments Due by Period, Total	207.8
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	184.4
Contractual Obligations, Payments Due by Period, 2025	374.0
Contractual Obligations, Payments Due by Period, 2026	355.0
Contractual Obligations, Payments Due by Period, 2027	336.7
Contractual Obligations, Payments Due by Period, 2028	317.2
Contractual Obligations, Payments Due by Period, Thereafter	4,285.8
Contractual Obligations, Payments Due by Period, Total	5,853.1
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	472.2
Contractual Obligations, Payments Due by Period, 2025	574.0
Contractual Obligations, Payments Due by Period, 2026	995.0
Contractual Obligations, Payments Due by Period, 2027	814.7
Contractual Obligations, Payments Due by Period, 2028	517.2
Contractual Obligations, Payments Due by Period, Thereafter	10,840.8
Contractual Obligations, Payments Due by Period, Total	14,213.9
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	54.2
Contractual Obligations, Payments Due by Period, 2025	108.9
Contractual Obligations, Payments Due by Period, 2026	90.5
Contractual Obligations, Payments Due by Period, 2027	73.3
Contractual Obligations, Payments Due by Period, 2028	55.8
Contractual Obligations, Payments Due by Period, Thereafter	92.4
Contractual Obligations, Payments Due by Period, Total	475.1
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Receivable by Period, 2024	(1.2)
Contractual Obligations, Payments Receivable by Period, 2025	(1.8)
Contractual Obligations, Payments Receivable by Period, 2026	(1.7)
Contractual Obligations, Payments Receivable by Period, 2027	(1.6)
Contractual Obligations, Payments Receivable by Period, 2028	(1.1)
Contractual Obligations, Payments Receivable by Period, Thereafter	(0.8)
Contractual Obligations, Payments Receivable by Period, Total	(8.2)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	80.0
Contractual Obligations, Payments Due by Period, 2025	71.6
Contractual Obligations, Payments Due by Period, 2026	29.0
Contractual Obligations, Payments Due by Period, 2027	23.3
Contractual Obligations, Payments Due by Period, 2028	16.9
Contractual Obligations, Payments Due by Period, Thereafter	48.3
Contractual Obligations, Payments Due by Period, Total	269.1
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2024	605.2
Contractual Obligations, Payments Due by Period, 2025	752.7
Contractual Obligations, Payments Due by Period, 2026	1,112.8
Contractual Obligations, Payments Due by Period, 2027	909.7
Contractual Obligations, Payments Due by Period, 2028	588.8
Contractual Obligations, Payments Due by Period, Thereafter	10,980.7
Contractual Obligations, Payments Due by Period, Total	$ 14,949.9

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)	3 Months Ended		6 Months Ended		270 Months Ended
	Jun. 30, 2024 USD ($) ft² Entity LetterOfCredit	Jun. 30, 2023 Entity	Jun. 30, 2024 USD ($) ft² LetterOfCredit Entity	Jun. 30, 2023 Entity	Jun. 30, 2024 USD ($) ft² Entity LetterOfCredit
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of square feet | ft²	360,000		360,000		360,000
Number of companies acquired | Entity	30	34	58	45	725
Aggregate amount of maximum earnout obligations related to acquisitions			$ 1,925,800,000
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet			1,236,700,000
Aggregate amount of earnout obligation expected settlement in cash or stock at option	$ 491,800,000		491,800,000		$ 491,800,000
Aggregate amount of earnout obligation expected settlement in cash	$ 744,900,000		744,900,000		$ 744,900,000
Income tax credits and adjustments			$ 108,000,000
Collateral [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit	1		1		1
Security Deposit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit	1		1		1
Self-Insurance Deductibles [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit	2		2		2
Rent-A-Captive Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit	8		8		8
Errors And Omissions [Member] | Up to $4.5 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained			$ 2,000,000.0
Errors And Omissions [Member] | Up to $10 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained			15,000,000.0
Errors And Omissions [Member] | Up to $20.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained			10,000,000.0
Errors And Omissions [Member] | Up to $27.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained			20,000,000.0
Letter of Credit [Member] | Collateral [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt	$ 500,000		500,000		$ 500,000
Letter of Credit [Member] | Security Deposit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt	900,000		900,000		900,000
Letter of Credit [Member] | Self-Insurance Deductibles [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt	9,300,000		9,300,000		9,300,000
Liabilities recorded on self-insurance	14,000,000		14,000,000		14,000,000
Letter of Credit [Member] | Rent-A-Captive Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt	13,000,000		13,000,000		13,000,000
Minimum [Member] | Errors And Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Loss Contingency Accrual, Product Liability, Net, Total	8,800,000		8,800,000		8,800,000
Minimum [Member] | Errors And Omissions [Member] | Up to $4.5 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	15,000,000.0		15,000,000.0		15,000,000.0
Minimum [Member] | Errors And Omissions [Member] | Up to $20.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	100,000,000.0		100,000,000.0		100,000,000.0
Minimum [Member] | Errors And Omissions [Member] | Up to $27.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	225,000,000.0		225,000,000.0		225,000,000.0
Maximum [Member] | Errors And Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Loss Contingency Accrual, Product Liability, Net, Total	6,200,000		6,200,000		6,200,000
Maximum [Member] | Errors And Omissions [Member] | Up to $4.5 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	100,000,000.0		100,000,000.0		100,000,000.0
Maximum [Member] | Errors And Omissions [Member] | Up to $20.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	225,000,000.0		225,000,000.0		225,000,000.0
Maximum [Member] | Errors And Omissions [Member] | Up to $27.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claim arise during ordinary course of business	$ 400,000,000.0		$ 400,000,000.0		$ 400,000,000.0
Unconsolidated Investments in Enterprises [Member] | Minimum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Ownership interest	1.00%		1.00%		1.00%
Unconsolidated Investments in Enterprises [Member] | Maximum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Ownership interest	50.00%		50.00%		50.00%

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2024	$ 1.0
Amount of Commitment Expiration by Period - Thereafter	23.7
Total Amounts Committed	24.7
Financial Guarantees [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2024	1.0
Total Amounts Committed	1.0
Letters of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - Thereafter	23.7
Total Amounts Committed	$ 23.7

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Supplemental Disclosures of Cash Flow Information - Cash Flow (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash and Cash Equivalents [Abstract]
Interest paid	$ 162.1	$ 127.3
Income taxes paid, net	$ 167.8	$ 116.7

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Supplemental Disclosures of Cash Flow Information - Cash Equivalents, Restricted Cash and Fiduciary Cash (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents - non-restricted cash	$ 1,219.2		$ 777.9
Cash and cash equivalents - restricted cash	196.1		174.4
Total cash and cash equivalents	1,415.3	$ 971.5	952.3
Fiduciary cash	5,422.5	$ 5,571.8	5,989.9
Total cash, cash equivalents, restricted cash and fiduciary cash	$ 6,837.8		$ 6,942.2

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Supplemental Disclosures of Cash Flow Information - Additional Information (Detail) - Qualified Contributory Savings and Thrift 401(k) Plan [Member] - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Matching contributions by employer, percentage	100.00%
Percentage of eligible compensation for matching contributions by employer	5.00%	5.00%
Matching contributions vesting schedule	5 years
Contribution expense to plan	$ 56.0	$ 42.3
Employer match on eligible compensation			5.00%	5.00%

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Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss Attributable to Controlling Interests (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ (792.1)
Ending Balance	(939.2)
Pension Liability [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(37.1)
Net change in period	0.2
Ending Balance	(36.9)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(867.4)
Net change in period	(144.5)
Ending Balance	(1,011.9)
Fair Value of Derivative Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	112.4
Net change in period	(2.8)
Ending Balance	109.6
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(792.1)
Net change in period	(147.1)
Ending Balance	$ (939.2)

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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Expense related to pension liability reclassified from accumulated other comprehensive earnings	$ 1,000,000	$ 2,600,000
Income (expense) related to fair value of derivative investments reclassified from accumulated other comprehensive earnings	(3,000,000)	(1,500,000)
Foreign currency translation reclassified from accumulated other comprehensive earnings	$ 0	$ 0

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Segment Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2024 Segment
Segment Reporting [Abstract]
Number of reportable segments	3

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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 2,775.4	$ 2,441.9	$ 6,032.1	$ 5,148.0
Earnings before income taxes	365.6	297.4	1,138.3	903.2
Identifiable assets at June 30, 2024 and 2023	63,007.7	54,365.2	63,007.7	54,365.2	$ 51,615.8
Operating Segments [Member] | Brokerage [Member]
Segment Reporting Information [Line Items]
Total revenues	2,376.3	2,088.4	5,241.2	4,463.6
Earnings before income taxes	446.3	390.5	1,322.4	1,081.4
Identifiable assets at June 30, 2024 and 2023	58,776.7	50,623.8	58,776.7	50,623.8
Operating Segments [Member] | Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenues	398.0	353.6	789.4	684.4
Earnings before income taxes	65.4	49.9	118.6	95.4
Identifiable assets at June 30, 2024 and 2023	1,683.4	1,212.8	1,683.4	1,212.8
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Total revenues	1.1	(0.1)	1.5
Earnings before income taxes	(146.1)	(143.0)	(302.7)	(273.6)
Identifiable assets at June 30, 2024 and 2023	$ 2,547.6	$ 2,528.6	$ 2,547.6	$ 2,528.6

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Segment Information - Summary of Revenues by Type and Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 2,736.0	$ 2,406.9	$ 5,954.1	$ 5,079.8
Reimbursements	39.4	35.0	78.0	68.2
Total revenues	2,775.4	2,441.9	6,032.1	5,148.0
Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	1,719.9	1,498.3	3,854.8	3,253.8
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	588.6	539.2	1,187.4	1,064.0
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	146.9	121.3	267.9	219.5
Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	112.0	106.1	216.8	201.3
New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	58.0	57.3	101.9	99.2
Other Foreign [Member]
Segment Reporting Information [Line Items]
Total revenues	150.0	119.7	403.3	310.2
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	2,376.3	2,088.4	5,241.2	4,463.6
Total revenues	2,376.3	2,088.4	5,241.2	4,463.6
Brokerage [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1,394.6	1,199.7	3,208.6	2,675.0
Brokerage [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	574.6	527.6	1,159.4	1,041.1
Brokerage [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	90.9	83.8	158.9	148.0
Brokerage [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	110.3	104.6	213.4	198.3
Brokerage [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	55.9	53.0	97.6	91.0
Brokerage [Member] | Other Foreign [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	150.0	119.7	403.3	310.2
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	358.6	318.6	711.4	616.2
Reimbursements	39.4	35.0	78.0	68.2
Total revenues	398.0	353.6	789.4	684.4
Risk Management [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	324.2	298.7	644.7	578.8
Risk Management [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	14.0	11.6	28.0	22.9
Risk Management [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	56.0	37.5	109.0	71.5
Risk Management [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1.7	1.5	3.4	3.0
Risk Management [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	2.1	4.3	4.3	8.2
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1.1	(0.1)	1.5
Total revenues	1.1	(0.1)	1.5
Corporate [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1.1	(0.1)	1.5
Commissions [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,661.8	1,410.4	3,655.4	3,157.8
Commissions [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,661.8	1,410.4	3,655.4	3,157.8
Broker Fees [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	827.1	790.5	1,778.3	1,496.2
Broker Fees [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	477.6	478.5	1,084.3	891.2
Broker Fees [Member] | Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	349.5	312.0	694.0	605.0
Supplemental Revenue Member [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	88.7	71.2	182.6	152.8
Supplemental Revenue Member [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	88.7	71.2	182.6	152.8
Contingent Revenue [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	59.8	54.2	145.8	126.0
Contingent Revenue [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	59.8	54.2	145.8	126.0
Interest Income Premium Finance Revenues and Other Income [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	98.6	80.6	192.0	147.0
Interest Income Premium Finance Revenues and Other Income [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	88.4	74.1	173.1	135.8
Interest Income Premium Finance Revenues and Other Income [Member] | Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	9.1	6.6	17.4	11.2
Interest Income Premium Finance Revenues and Other Income [Member] | Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1.1	(0.1)	1.5
Investment Income [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 98.6	$ 80.6	$ 192.0	$ 147.0

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Segment Information - Summary of Geographical Location and Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 2,775.4	$ 2,441.9	$ 6,032.1	$ 5,148.0
Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	1,719.9	1,498.3	3,854.8	3,253.8
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	588.6	539.2	1,187.4	1,064.0
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	146.9	121.3	267.9	219.5
Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	112.0	106.1	216.8	201.3
New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	58.0	57.3	101.9	99.2
Other Foreign [Member]
Segment Reporting Information [Line Items]
Total revenues	150.0	119.7	403.3	310.2
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	2,376.3	2,088.4	5,241.2	4,463.6
Brokerage [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1,394.6	1,199.7	3,208.6	2,675.0
Brokerage [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	574.6	527.6	1,159.4	1,041.1
Brokerage [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	90.9	83.8	158.9	148.0
Brokerage [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	110.3	104.6	213.4	198.3
Brokerage [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	55.9	53.0	97.6	91.0
Brokerage [Member] | Other Foreign [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	150.0	119.7	403.3	310.2
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	398.0	353.6	789.4	684.4
Risk Management [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	324.2	298.7	644.7	578.8
Risk Management [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	14.0	11.6	28.0	22.9
Risk Management [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	56.0	37.5	109.0	71.5
Risk Management [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1.7	1.5	3.4	3.0
Risk Management [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	2.1	4.3	4.3	$ 8.2
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1.1	(0.1)	1.5
Corporate [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1.1	$ (0.1)	$ 1.5