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, 2021          

or

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

For the transition period from                           to                           

Commission File Number:  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, 2021 was approximately 206,750,000.

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, 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: plans with respect to deploying funds raised through our public offering of common stock on May 17, 2021; our plan to redeem $650 million of senior notes; 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; 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, investigations, 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, including our clean energy investments; human capital management, including diversity and inclusion initiatives; environmental, social and governance matters, including climate-resilience products and services and carbon emissions; and integrating recent acquisitions.  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:  

• The ongoing COVID-19 pandemic, including its effect on the economy, our employees, our clients, the regulatory environment and our operations;

• A future economic downturn or unstable economic conditions, whatever the cause, including the effects of the COVID-19 pandemic, or other factors like Brexit, worsening international relations, tariffs, trade wars, political violence and unrest in the U.S. or around the world, or climate change and other long-term environmental, social and governance matters and global health risks;

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

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

• 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 growing interest in acquiring insurance brokers on the part of private equity firms and newly public insurance brokers, which could make it more difficult to identify targets and could make them more expensive, the risk that we may not receive timely regulatory approval of desired transactions, 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;

• Failure to successfully and cost-effectively integrate recently acquired businesses and their operations or fully realize synergies from such acquisitions in the expected time frame;

• Cyber attacks or other cybersecurity incidents, including the ransomware incident we publicly disclosed in September 2020; improper disclosure of confidential, personal or proprietary data; and changes to laws and regulations governing cybersecurity and data privacy;

• Risks arising from changes in U.S. or foreign tax laws, including the current U.S. president’s administration’s potential reversal of all or part of the U.S. Tax Cuts and Jobs Act 2017 (which we refer to as the TCJA) and related regulations and the recent increase in U.K. corporate tax rates;

• Uncertainty from the expected discontinuance of LIBOR;

• Our failure to attract and retain experienced and qualified talent, including our senior management team, and the risk of our CEO or another senior executive contracting COVID-19;

• Risks arising from our international operations, including the risks posed by political and economic uncertainty in certain countries (such as the risks posed by Brexit), risks related to maintaining regulatory and legal compliance across multiple jurisdictions (such as those relating to violations of anti-corruption, sanctions and privacy laws), rising global tensions and

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protectionism, and risks arising from the complexity of managing businesses across different time zones, languages, geographies, cultures and legal regimes that conflict with one another at times;

• Risks particular to our risk management segment, including any slowing of the trend toward outsourcing claims administration, and of the concentration of large amounts of revenue with certain clients;

• Risks particular to our benefit consulting operations, including risks to the business posed by potential changes to health legislation under the current U.S. president’s administration;

• The higher level of variability inherent in contingent and supplemental revenues versus standard commission revenues, particularly in light of the changed revenue recognition accounting standard;

• Sustained increases in the cost of employee benefits;

• A disaster or other significant disruption to business continuity; including natural disasters and political violence and unrest in the U.S. or elsewhere around the world;

• Damage to our reputation including as a result of environmental, social and governance (ESG) matters;

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

• Our failure to apply technology 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;

• Our failure to comply with regulatory requirements, including those related to governance and control requirements in particular jurisdictions, international sanctions, or a change in regulations or enforcement policies that adversely affects our operations (for example, relating to insurance broker compensation methods);

• Violations or alleged violations of the U.S. Foreign Corrupt Practices Act (which we refer to as FCPA), the 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 (which we refer to as FATCA);

• The outcome of any existing or future investigation, review, regulatory action or litigation;

• Unfavorable determinations related to contingencies and legal proceedings;

• Significant changes in foreign exchange rates;

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

• Risks related to our clean energy investments, including intellectual property claims, utilities switching from coal to natural gas or renewable energy sources, environmental and product liability claims, environmental compliance costs and the risk of disallowance by the Internal Revenue Service (which we refer to as the IRS) 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 we may not be able to receive dividends or other distributions from subsidiaries;

• The risk of share ownership dilution when we issue common stock as consideration for acquisitions and for other reasons; and

• Volatility of the price of our common stock.

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Forward-looking statements are not guarantees of future performance.  They involve risks, uncertainties and assumptions, including the risk factors referred to above, and are currently, or in the future could be, amplified by the COVID-19 pandemic.  Our future performance and actual results 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.

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, 2020, the prospectus filed on May 17, 2021 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, 2021 and 2020	6
		Consolidated Statement of Comprehensive Earnings for the Three-month and Six-month Periods Ended June 30, 2021 and 2020	7
		Consolidated Balance Sheet at June 30, 2021 and December 31, 2020	8
		Consolidated Statement of Cash Flows for the Six-month Periods Ended June 30, 2021 and 2020	9
		Consolidated Statement of Stockholders’ Equity for the Three-month and Six-month Periods Ended June 30, 2021 and 2020	10-11
		Notes to June 30, 2021 Consolidated Financial Statements	12-36
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37-68
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	68-69
	Item 4.	Controls and Procedures	70
Part II.	Other Information
	Item 1.	Legal Proceedings	70
	Item 1A.	Risk Factors.	70
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	71-72
	Item 6.	Exhibits	72
	Signature		73

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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,
	2021		2020		2021		2020
Commissions	$	977.1	$	827.5	$	2,102.5	$	1,844.7
Fees		540.9		459.7		1,094.7		967.0
Supplemental revenues		55.2		50.3		122.0		109.3
Contingent revenues		43.3		37.4		106.6		82.5
Investment income		18.1		16.0		35.2		34.6
Net gains on divestitures		0.6		1.0		4.7		1.2
Revenues from clean coal activities		261.0		159.5		561.6		341.3
Other net revenues		0.6		0.2		2.1		0.2
Revenues before reimbursements		1,896.8		1,551.6		4,029.4		3,380.8
Reimbursements		36.7		32.4		69.1		70.1
Total revenues		1,933.5		1,584.0		4,098.5		3,450.9
Compensation		937.1		815.6		1,912.7		1,711.8
Operating		253.4		214.8		486.5		472.5
Reimbursements		36.7		32.4		69.1		70.1
Cost of revenues from clean coal activities		268.8		161.2		577.9		346.6
Interest		56.2		50.0		104.3		100.5
Depreciation		37.2		34.4		75.3		71.2
Amortization		108.0		88.2		213.2		223.8
Change in estimated acquisition earnout payables		13.8		15.7		28.8		(73.3	)
Total expenses		1,711.2		1,412.3		3,467.8		2,923.2
Earnings before income taxes		222.3		171.7		630.7		527.7
Provision for income taxes		20.5		9.9		35.2		10.5
Net earnings		201.8		161.8		595.5		517.2
Net earnings attributable to noncontrolling interests		11.6		8.1		23.2		17.2
Net earnings attributable to controlling interests	$	190.2	$	153.7	$	572.3	$	500.0
Basic net earnings per share	$	0.94	$	0.81	$	2.89	$	2.64
Diluted net earnings per share		0.92		0.79		2.83		2.58
Dividends declared per common share		0.48		0.45		0.96		0.90

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,
	2021			2020			2021		2020
Net earnings	$	201.8		$	161.8		$	595.5	$	517.2
Change in pension liability, net of taxes		0.1			—			1.1		1.2
Foreign currency translation, net of taxes		30.4			250.7			88.4		(130.6	)
Change in fair value of derivative investments,    net of taxes		(33.2	)		(1.8	)		23.6		(93.2	)
Comprehensive earnings		199.1			410.7			708.6		294.6
Comprehensive earnings attributable to    noncontrolling interests		11.3			7.3			23.5		17.6
Comprehensive earnings attributable to    controlling interests	$	187.8		$	403.4		$	685.1	$	277.0

See notes to consolidated financial statements.

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Arthur J. Gallagher & Co.

Consolidated Balance Sheet

(Unaudited - in millions)

	June 30, 2021			December 31, 2020
Cash and cash equivalents	$	3,204.1		$	664.6
Restricted cash		3,170.9			2,909.7
Premiums and fees receivable		8,394.8			6,436.0
Other current assets		1,169.5			1,113.9
Total current assets		15,939.3			11,124.2
Fixed assets - net		454.9			450.7
Deferred income taxes		1,126.3			1,085.8
Other noncurrent assets		860.8			769.9
Right-of-use assets		358.3			373.9
Goodwill		6,630.3			6,127.0
Amortizable intangible assets - net		2,447.3			2,399.9
Total assets	$	27,817.2		$	22,331.4
Premiums payable to underwriting enterprises	$	9,716.7		$	7,784.6
Accrued compensation and other current liabilities		1,408.4			1,596.2
Deferred revenue - current		530.1			475.6
Premium financing debt		166.1			203.6
Corporate related borrowings - current		200.0			75.0
Total current liabilities		12,021.3			10,135.0
Corporate related borrowings - noncurrent		5,712.2			4,266.0
Deferred revenue - noncurrent		62.0			65.7
Lease liabilities - noncurrent		302.6			320.9
Other noncurrent liabilities		1,365.1			1,311.1
Total liabilities		19,463.2			16,098.7
Stockholders' equity:
Common stock - issued and outstanding 206.8 shares in 2021 and 193.7 shares in 2020		206.8			193.7
Capital in excess of par value		5,887.3			4,264.4
Retained earnings		2,749.1			2,371.7
Accumulated other comprehensive loss		(530.5	)		(643.6	)
Stockholders' equity attributable to controlling interests		8,312.7			6,186.2
Stockholders' equity attributable to noncontrolling interests		41.3			46.5
Total stockholders' equity		8,354.0			6,232.7
Total liabilities and stockholders' equity	$	27,817.2		$	22,331.4

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,
	2021			2020
Cash flows from operating activities:
Net earnings	$	595.5		$	517.2
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other		(6.3	)		(1.2	)
Depreciation and amortization		288.5			295.0
Change in estimated acquisition earnout payables		28.8			(73.3	)
Amortization of deferred compensation and restricted stock		31.8			30.8
Stock-based and other noncash compensation expense		8.2			6.7
Payments on acquisition earnouts in excess of original estimates		(24.3	)		(14.3	)
Effect of changes in foreign exchange rates		6.5			(6.5	)
Net change in premiums and fees receivable		(1,678.7	)		(1,569.1	)
Net change in deferred revenue		36.4			18.4
Net change in premiums payable to underwriting enterprises		1,617.4			1,723.6
Net change in other current assets		(52.8	)		103.1
Net change in accrued compensation and other current liabilities		(53.9	)		(206.4	)
Net change in income taxes payable		(30.9	)		34.3
Net change in deferred income taxes		(23.5	)		(79.3	)
Net change in other noncurrent assets and liabilities		(54.4	)		23.2
Net cash provided by operating activities		688.3			802.2
Cash flows from investing activities:
Capital expenditures		(59.2	)		(58.8	)
Cash paid for acquisitions, net of cash and restricted cash acquired		(551.6	)		(82.9	)
Net proceeds from sales of operations/books of business		9.4			2.5
Net funding of investment transactions		(0.7	)		(0.6	)
Net cash used by investing activities		(602.1	)		(139.8	)
Cash flows from financing activities:
Payments on acquisition earnouts		(115.8	)		(30.7	)
Proceeds from issuance of common stock		1,502.0			58.2
Payments to noncontrolling interests		(21.6	)		(81.4	)
Dividends paid		(202.4	)		(173.5	)
Net borrowings on premium financing debt facility		(37.8	)		(62.7	)
Borrowings on line of credit facility		925.0			2,550.0
Repayments on line of credit facility		(925.0	)		(2,970.0	)
Net borrowings of corporate related long-term debt		1,586.5			524.8
Debt acquisition costs		(14.6	)		(1.3	)
Settlements on terminated interest rate swaps		(31.9	)		(65.9	)
Net cash provided (used) by financing activities		2,664.4			(252.5	)
Effect of changes in foreign exchange rates on cash and cash equivalents and    restricted cash		50.1			(31.1	)
Net increase in cash, cash equivalents and restricted cash		2,800.7			378.8
Cash, cash equivalents and restricted cash at beginning of period		3,574.3			2,623.9
Cash, cash equivalents and restricted cash at end of period	$	6,375.0		$	3,002.7

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, 2020		193.7	$	193.7	$	4,264.4		$	2,371.7		$	(643.6	)	$	46.5		$	6,232.7
Net earnings		—		—		—			382.1			—			11.6			393.7
Dividends paid to noncontrolling    interests		—		—		—			—			—			(10.3	)		(10.3	)
Net change in pension asset/    liability, net of taxes of    $0.2 million		—		—		—			—			1.0			—			1.0
Foreign currency translation		—		—		—			—			58.0			0.6			58.6
Change in fair value of derivative    instruments, net of taxes of    $19.0 million		—		—		—			—			56.8			—			56.8
Compensation expense related to    stock option plan grants		—		—		3.7			—			—			—			3.7
Common stock issued in:
Five purchase transactions		0.6		0.6		66.9			—			—			—			67.5
Stock option plans		0.6		0.6		29.6			—			—			—			30.2
Employee stock purchase plan		0.1		0.1		6.9			—			—			—			7.0
Shares issued to benefit plans		0.6		0.6		70.8												71.4
Deferred compensation and    restricted stock		0.3		0.3		(38.2	)		—			—			—			(37.9	)
Cash dividends declared on    common stock		—		—		—			(94.9	)		—			—			(94.9	)
Balance at March 31, 2021		195.9		195.9		4,404.1			2,658.9			(527.8	)		48.4			6,779.5
Net earnings		—		—		—			190.2			—			11.6			201.8
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			(11.0	)		(11.0	)
Dividends paid to noncontrolling    interests		—		—		—			—			—			(7.4	)		(7.4	)
Net change in pension asset/    liability, net of taxes of    $0.1 million		—		—		—			—			0.1			—			0.1
Foreign currency translation		—		—		—			—			30.4			(0.3	)		30.1
Change in fair value of derivative    instruments, net of taxes of    $(10.9) million		—		—		—			—			(33.2	)		—			(33.2	)
Compensation expense related to    stock option plan grants		—		—		4.5			—			—			—			4.5
Common stock issued in:
One purchase transaction		0.1		0.1		12.9			—			—			—			13.0
Stock option plans		0.3		0.3		15.4			—			—			—			15.7
Employee stock purchase plan		0.1		0.1		10.4			—			—			—			10.5
Deferred compensation and    restricted stock		0.1		0.1		12.1			—			—			—			12.2
Stock issuance from public    offering		10.3		10.3		1,427.6			—			—			—			1,437.9
Other compensation expense		—		—		0.3			—			—			—			0.3
Cash dividends declared on    common stock		—		—		—			(100.0	)		—			—			(100.0	)
Balance at June 30, 2021		206.8	$	206.8	$	5,887.3		$	2,749.1		$	(530.5	)	$	41.3		$	8,354.0

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, 2019		188.1	$	188.1	$	3,825.7		$	1,901.3		$	(759.6	)	$	60.0		$	5,215.5
Net earnings		—		—		—			346.3			—			9.1			355.4
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			(10.8	)		(10.8	)
Dividends paid to noncontrolling    interests		—		—		—			—			—			(18.9	)		(18.9	)
Net change in pension asset/    liability, net of taxes of    $0.3 million		—		—		—			—			1.2			—			1.2
Foreign currency translation		—		—		—			—			(381.3	)		1.2			(380.1	)
Change in fair value of derivative    instruments, net of taxes of    $(28.9) million		—		—		—			—			(91.4	)		—			(91.4	)
Compensation expense related to    stock option plan grants		—		—		3.4			—			—			—			3.4
Common stock issued in:
Three purchase transactions		0.7		0.7		72.4			—			—			—			73.1
Stock option plans		0.4		0.4		17.5			—			—			—			17.9
Employee stock purchase plan		0.1		0.1		5.9			—			—			—			6.0
Deferred compensation and    restricted stock		0.3		0.3		(15.3	)		—			—			—			(15.0	)
Cash dividends declared on    common stock		—		—		—			(86.2	)		—			—			(86.2	)
Balance at March 31, 2020		189.6	$	189.6	$	3,909.6		$	2,161.4		$	(1,231.1	)	$	40.6		$	5,070.1
Net earnings		—		—		—			153.7			—			8.1			161.8
Net purchase of subsidiary shares    from noncontrolling interests		—		—		—			—			—			4.3			4.3
Dividends paid to noncontrolling    interests		—		—		—			—			—			(6.3	)		(6.3	)
Foreign currency translation		—		—		—			—			250.7			(0.8	)		249.9
Change in fair value of derivative    instruments, net of taxes of    $0.0 million		—		—		—			—			(1.8	)		—			(1.8	)
Compensation expense related to    stock option plan grants		—		—		3.3			—			—			—			3.3
Common stock issued in:
Twenty-six purchase transactions		1.2		1.2		109.7			—			—			—			110.9
Stock option plans		0.5		0.5		21.4			—			—			—			21.9
Employee stock purchase plan		0.1		0.1		12.3			—			—			—			12.4
Deferred compensation and    restricted stock		0.1		0.1		(5.3	)		—			—			—			(5.2	)
Cash dividends declared on    common stock		—		—		—			(86.8	)		—			—			(86.8	)
Balance at June 30, 2020		191.5	$	191.5	$	4,051.0		$	2,228.3		$	(982.2	)	$	45.9		$	5,534.5

See notes to consolidated financial statements.

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Notes to June 30, 2021 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 or the company, provide insurance 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 companies and entities of all types, including commercial, not-for-profit, public entities, and, to a lesser extent, individuals, in the areas of insurance placement, 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, not-for-profit, captive and public 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.  Clean energy investments consist of our investments in limited liability companies that own 35 commercial clean coal production facilities that can produce refined coal using Chem-Mod LLC’s proprietary technologies.  We believe these operations produce refined coal that qualifies for tax credits under IRC Section 45.  

We do not assume 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.

Investment income and other revenues 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 investment income.

We are headquartered in Rolling Meadows, Illinois, have operations in 56 countries and offer client-service capabilities in more than 150 countries globally through a network of correspondent insurance brokers and consultants.

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We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission.  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, 2020, and include all normal recurring adjustments necessary for a fair presentation of the information set forth.  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, 2020.  In the preparation of our unaudited consolidated financial statements as of June 30, 2021, 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 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 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 (including our IRC Section 45 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.

2.  Effect of New Accounting Pronouncements    

Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application.  The amendments in ASU 2019-12 are effective for public business entities for fiscal years beginning after December 15, 2020, including interim periods therein.  We adopted this new guidance effective January 1, 2021.  The adoption did not have any impact on our consolidated financial statements.

3.  Business Combinations

During the six-month period ended June 30, 2021, we acquired substantially all of the net assets 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)
Atlas General Holdings, LLC
January 1, 2021 (AGH)		—	$	—	$	95.2	$	—	$	5.4	$	8.7	$	109.3	$	35.0
Bollington Wilson Group
February 5, 2021 (BWG)		—		—		328.0		—		1.4		—		329.4		—
LDJ American Online    Benefits Group, LLC       May 1, 2021 (LDJ)		—		—		38.2		—		7.1		14.8		60.1		20.0
Eleven other acquisitions    completed in 2021		152.0		19.4		130.6		0.1		11.8		25.7		187.6		50.5
		152.0	$	19.4	$	592.0	$	0.1	$	25.7	$	49.2	$	686.4	$	105.5

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On May 12, 2021, we signed an agreement to acquire certain Willis Towers Watson plc reinsurance, specialty and retail brokerage operations as part of a proposed regulatory remedy for the pending Aon plc and Willis Towers plc combination for net cash consideration of approximately $3.57 billion.  On July 26, 2021, we announced that this agreement had been terminated in conjunction with the announced termination of the Aon plc and Willis Towers Watson plc combination.

On May 17, 2021, we closed on a follow-on public offering of our common stock whereby 10.3 million shares of our stock were issued for net proceeds, after underwriting discounts and other expenses related to this offering, of $1,437.9 million. Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of the offering to fund this acquisition.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as other general corporate purposes.

On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as the 2031 Notes) and the $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 notes).  The weighted average interest rate is 3.31% per annum after giving effect to underwriting costs and the net hedge loss.  Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of this offering to fund this transaction.  In conjunction with the termination of this agreement, on July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes (which is described in further detail in Note 7 below).  These notes will be redeemed on August 13, 2021.

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 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. 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 2021 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 7.0% to 10.5% for all of our 2021 acquisitions.  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.  

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During the three-month periods ended June 30, 2021 and 2020, we recognized $9.2 million and $7.7  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, 2021 and 2020, we recognized $18.2 million and $18.4 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, 2021 and 2020, we recognized $4.6  million and $8.0  million of expense, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised projections of future performance for 26 and 44 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2021 and 2020, we recognized $10.6  million of expense and $91.6 million of income, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised projections of future performance for 48 and 102 acquisitions, respectively. The aggregate amount of maximum earnout obligations related to acquisitions was $1,068.1 million as of June 30, 2021, of which $560.1 million was recorded in the consolidated balance sheet as of June 30, 2021, based on the estimated fair value of the expected future payments to be made, of which approximately $536.2 million can be settled in cash or stock at our option and $23.9 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, 2021 (in millions):

							Eleven Other
	AGH		BWG		LDJ		Acquisitions		Total
Cash and restricted cash	$	32.8	$	24.9	$	0.7	$	7.2	$	65.6
Other current assets		112.0		15.2		15.8		36.9		179.9
Fixed assets		7.4		3.8		—		0.1		11.3
Noncurrent assets		1.2		5.3		0.2		5.4		12.1
Goodwill		45.9		223.0		29.1		89.2		387.2
Expiration lists		39.7		109.1		21.3		89.4		259.5
Non-compete agreements		0.3		16.1		0.6		1.2		18.2
Trade names		—		3.2		0.5		0.4		4.1
Total assets acquired		239.3		400.6		68.2		229.8		937.9
Current liabilities		129.8		39.6		8.0		36.4		213.8
Noncurrent liabilities		0.2		31.6		0.1		5.8		37.7
Total liabilities assumed		130.0		71.2		8.1		42.2		251.5
Total net assets acquired	$	109.3	$	329.4	$	60.1	$	187.6	$	686.4

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 in third party claims administration services 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 $387.2 million, $259.5 million, $18.2 million and $4.1 million, respectively, within the brokerage and risk management segments.

Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments.  The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values.  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 3.0% to 4.8% and 4.3% to 16.1%, respectively, for our 2020 acquisitions for which valuations were performed in 2021.  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.  These discount rates generally ranged from 10.0% to 13.5% for our 2020 acquisitions for which valuations were performed in 2021.  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

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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-month periods ended June 30, 2021 and 2020, we wrote off $8.0 million and $0.2 million, respectively, of amortizable assets related to the brokerage and risk management segments.  Based on the results of impairment reviews during the six-month periods ended June 30, 2021 and 2020, we wrote off $13.1  million and $46.0 million, respectively, of amortizable assets related to the brokerage and risk management segments.

Of the $259.5 million of expiration lists, $18.2 million of non-compete agreements and $4.1 million of trade names related to our acquisitions made during the six-month period ended June 30, 2021, $138.6 million, $16.4 million and $3.3 million, respectively, is not expected to be deductible for income tax purposes.  Accordingly, we recorded a deferred tax liability of $26.5 million, and a corresponding amount of goodwill, in the six-month period ended June 30, 2021, related to the nondeductible amortizable intangible assets.  

Our consolidated financial statements for the six-month period ended June 30, 2021 include the operations of the entities acquired in the six-month period ended June 30, 2021 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, 2020 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2021		2020		2021		2020
Total revenues	$	1,936.8	$	1,620.0	$	4,129.4	$	3,527.3
Net earnings attributable to controlling interests		190.6		153.2		575.6		500.2
Basic net earnings per share		0.95		0.80		2.91		2.64
Diluted net earnings per share		0.93		0.79		2.84		2.58

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, 2020, nor are they necessarily indicative of future operating results.  Annualized revenues of entities acquired during the six-month period ended June 30, 2021 totaled approximately $173.8 million.  For the six-month period ended June 30, 2021, total revenues and net earnings recorded in our unaudited consolidated statement of earnings related to our acquisitions made during the six-month period ended June 30, 2021 in the aggregate, were $60.6 million and $2.7 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 2021		December 31, 2020
Unbilled receivables	$	810.8	$	603.1
Deferred contract costs		80.7		102.0
Deferred revenue		592.1		541.3

The unbilled receivables, which are included in premiums and fees 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.

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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, 2020	$	354.7		$	186.6		$	541.3
Incremental deferred revenue		256.2			51.1			307.3
Revenue recognized during the six-month period ended    June 30, 2021 included in deferred revenue at December 31, 2020		(226.0	)		(51.4	)		(277.4	)
Net change in collected billings/deposits received from customers		(0.2	)		6.7			6.5
Impact of change in foreign exchange rates		5.5			0.3			5.8
Deferred revenue recognized from business acquisitions		8.6			—			8.6
Deferred revenue at June 30, 2021	$	398.8		$	193.3		$	592.1

Revenue recognized during the six-month period ended June 30, 2021 in the table above included revenue from 2020 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, 2021, the aggregate amount of the contract price allocated to remaining performance obligations was $592.1 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
2021 (remaining six months)	$	323.5	$	105.9	$	429.4
2022		60.0		44.4		104.4
2023		13.1		19.6		32.7
2024		1.1		8.8		9.9
2025		0.6		5.0		5.6
Thereafter		0.5		9.6		10.1
Total	$	398.8	$	193.3	$	592.1

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 $80.7 million and $102.0 million as of June 30, 2021 and December 31, 2020, respectively.  Capitalized fulfillment costs are amortized to expense on the contract effective date.  The amount of amortization of the deferred contract costs was $221.6 million and $208.1 million for the six-month periods ended June 30, 2021 and 2020, respectively.

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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.  Other Financial Data

Other Current Assets

Major classes of other current assets consist of the following (in millions):

	June 30, 2021		December 31, 2020
Premium finance advances and loans	$	443.3	$	442.7
Accrued supplemental, direct bill and other receivables		375.6		361.7
Refined coal production related receivables		137.8		95.4
Deferred contract costs		80.7		102.0
Prepaid expenses		132.1		112.1
Total other current assets	$	1,169.5	$	1,113.9

The premium finance advances and loans represent short-term loans which we make to many of our brokerage related clients and other non‑brokerage clients to finance their premiums paid to underwriting enterprises.  These premium finance advances and loans are primarily generated by three Australian and New Zealand premium finance subsidiaries.  Financing receivables are carried at amortized cost.  Given that these receivables carry a fairly rapid delinquency period of only seven days post payment date, and that contractually the majority of the underlying insurance policies will be cancelled within one month of the payment due date in normal course, there historically has been a minimal risk of not receiving payment, and therefore we do not maintain any significant allowance for losses against this balance.  

6.  Intangible Assets

The carrying amount of goodwill at June 30, 2021 and December 31, 2020 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2021
United States	$	3,543.7	$	65.2	$	—	$	3,608.9
United Kingdom		1,602.4		15.6		—		1,618.0
Canada		540.3		—		—		540.3
Australia		468.5		11.5		—		480.0
New Zealand		220.2		10.6		—		230.8
Other foreign		149.4		—		2.9		152.3
Total goodwill	$	6,524.5	$	102.9	$	2.9	$	6,630.3
At December 31, 2020
United States	$	3,399.8	$	33.2	$	—	$	3,433.0
United Kingdom		1,328.3		15.1		—		1,343.4
Canada		492.9		—		—		492.9
Australia		462.1		11.5		—		473.6
New Zealand		221.9		10.7		—		232.6
Other foreign		148.6		—		2.9		151.5
Total goodwill	$	6,053.6	$	70.5	$	2.9	$	6,127.0

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The changes in the carrying amount of goodwill for the six-month period ended June 30, 2021 are as follows (in millions):

	Brokerage			Risk Management		Corporate		Total
Balance as of December 31, 2020	$	6,053.6		$	70.5	$	2.9	$	6,127.0
Goodwill acquired during the period		355.2			32.0		—		387.2
Goodwill adjustments due to appraisals and other acquisition adjustments		52.5			—		—		52.5
Goodwill written-off related to sales of business and impairment		(1.0	)		—		—		(1.0	)
Foreign currency translation adjustments during the period		64.2			0.4		—		64.6
Balance as of June 30, 2021	$	6,524.5		$	102.9	$	2.9	$	6,630.3

Major classes of amortizable intangible assets at June 30, 2021 and December 31, 2020 consist of the following (in millions):

	June 30,			December 31,
	2021			2020
Expiration lists	$	5,017.9		$	4,753.2
Accumulated amortization - expiration lists		(2,655.0	)		(2,436.7	)
		2,362.9			2,316.5
Non-compete agreements		88.6			75.9
Accumulated amortization - non-compete agreements		(62.9	)		(57.8	)
		25.7			18.1
Trade names		105.7			107.8
Accumulated amortization - trade names		(47.0	)		(42.5	)
		58.7			65.3
Net amortizable assets	$	2,447.3		$	2,399.9

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

2021 (remaining six months)	$	197.8
2022		376.5
2023		349.5
2024		307.8
2025		267.1
Thereafter		948.6
Total	$	2,447.3

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7.  Credit and Other Debt Agreements

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2021			2020
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.50%, balloon due May 20, 2031	$	650.0		$	-
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			—
Total Senior Notes		1,500.0			-
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 5.18%, balloon due February 10, 2021		-			75.0
Semi-annual payments of interest, fixed rate of 3.69%, balloon due June 14, 2022		200.0			200.0
Semi-annual payments of interest, fixed rate of 5.49%, balloon due February 10, 2023		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.13%, balloon due June 24, 2023		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		325.0			325.0
Quarterly payments of interest, floating rate of 90 day LIBOR plus 1.40%, balloon due June 13, 2024		50.0			50.0
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			—
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		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		4,448.0			4,348.0
Credit Agreement:
Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires June 7, 2024		—			—
Premium Financing Debt Facility - expires September 15, 2022:
Facility B
AUD denominated tranche, interbank rates plus 1.400%		147.3			193.1
NZD denominated tranche, interbank rates plus 1.750%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.730%		13.2			—
NZD denominated tranche, interbank rates plus 0.940%		5.6			10.5
Total Premium Financing Debt Facility		166.1			203.6
Total corporate and other debt		6,114.1			4,551.6
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(21.7	)		(7.0	)
Less unamortized discount on Bonds Payable		(14.1	)		—
Net corporate and other debt	$	6,078.3		$	4,544.6

On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as the 2031 Notes) and the $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 Notes and together with the 2031 Notes, the “Notes”).  The weighted average interest rate is 3.31% per annum after giving effect to underwriting costs and the net hedge loss.  In 2018 and 2019, we entered into a pre-issuance interest rate hedging transaction related to these notes.  We realized a net cash loss of approximately $57.8 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over a ten year period.  Prior to the termination our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of this offering to fund a portion of the cash consideration payable in connection with this transaction.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as general corporate purposes. The offering of the Notes was made pursuant to a shelf registration statement filed with the SEC.  

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The 2031 Notes have a special optional redemption whereby we may, at our option, redeem the 2031 Notes, in whole and not in part, by providing notice of such redemption to the holders of the 2031 Notes within 30 days following a Willis Tower Watson plc transaction termination event, at a redemption price equal to 101% of the aggregate principal amount of the 2031 Notes, plus any accrued and unpaid interest.  In conjunction with the termination of this agreement, on July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes. These notes will be redeemed on August 13, 2021.  The impact of the extinguishment of this debt, which includes the redemption price premium, the unamortized discount amount on the debt issuance and the write-off of all the debt acquisition costs, is estimated to be an after-tax loss of $12.0 million to $14.0 million that will be recognized in third quarter 2021.  The 2051 Notes are not subject to the special optional redemption.

8.  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,
	2021		2020		2021		2020
Net earnings attributable to controlling interests	$	190.2	$	153.7	$	572.3	$	500.0
Weighted average number of common shares outstanding		201.3		190.5		198.0		189.6
Dilutive effect of stock options using the treasury    stock method		4.5		3.6		4.5		4.0
Weighted average number of common and common    equivalent shares outstanding		205.8		194.1		202.5		193.6
Basic net earnings per share	$	0.94	$	0.81	$	2.89	$	2.64
Diluted net earnings per share	$	0.92	$	0.79	$	2.83	$	2.58

Anti-dilutive stock-based awards of 1.6 million shares were outstanding at June 30, 2021 and 2020 that 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 1.0 million shares were outstanding at June 30, 2021 and 2020 that 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.

9.  Stock Option Plans

On May 16, 2017, our stockholders approved the Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2014 Long-Term Incentive Plan (which we refer to as the 2014 LTIP).  The LTIP term began May 16, 2017 and terminates on the date of the annual meeting of stockholders in 2027, 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. To the extent that shares subject to an outstanding award granted under either the LTIP or prior equity plans are not

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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) is 1.8 million at June 30, 2021.  

The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non-qualified 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 16, 2021, the compensation committee granted 1,640,000 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 2024, 2025 and 2026, respectively.  On March 12, 2020, the compensation committee granted 1,590,740 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 2023, 2024 and 2025, respectively.  The 2021 and 2020 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment.  For our executive officers age 55 or older, stock options are not subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.

During the three-month periods ended June 30, 2021 and 2020, we recognized $4.5 million and $3.3 million, respectively, of compensation expense related to our stock option grants. During the six-month periods ended June 30, 2021 and 2020, we recognized $8.2 million and $6.7 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:

	2021			2020
Expected dividend yield		1.5	%		2.1	%
Expected risk-free interest rate		0.9	%		0.7	%
Volatility		22.9	%		17.3	%
Expected life (in years)		5.4			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-months periods ended June 30, 2021 and 2020, as determined on the grant date using the Black-Scholes option pricing model, was $23.38 and $9.99, respectively.

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The following is a summary of our stock option activity and related information for 2021 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2021
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.5		$	65.09
Granted		1.6			127.90
Exercised		(0.9	)		49.43
Forfeited or canceled		(0.1	)		84.41
Ending balance		8.1		$	79.59		4.26	$	488.4
Exercisable at end of period		2.5		$	50.83		2.00	$	222.2
Ending unvested and expected to vest		5.1		$	91.44		5.21	$	250.3

Options with respect to 9.4 million shares (less any shares of restricted stock issued under the LTIP - see Note 11 to these unaudited consolidated financial statements) were available for grant under the LTIP at June 30, 2021.

The total intrinsic value of options exercised during the six-month periods ended June 30, 2021 and 2020 was $78.1 million and $47.1 million, respectively.  As of June 30, 2021, we had approximately $57.6 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, 2021 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
$	43.71	—	$	43.71		1.0	$	1.71	$	43.71		1.0	$	43.71
	46.17	—		46.17		0.5		0.70		46.17		0.5		46.17
	49.55	—		56.86		1.1		2.71		56.83		0.7		56.84
	70.74			70.74		1.1		3.71		70.74		0.3		70.74
	79.59	—		79.59		1.2		4.71		79.59		—		79.59
	86.17	—		86.17		1.6		5.70		86.17		—		86.17
	127.90	—		127.90		1.6		6.72		127.90		—		—
$	43.71	—	$	127.90		8.1		4.26	$	79.59		2.5	$	50.83

10.  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 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.

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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 consolidated financial statements.  

In the first quarters of 2021 and 2020, the compensation committee approved $17.0 million and $14.1 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 2021 and 2020, 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 2021 and 2020 awards.  During the three-month periods ended June 30, 2021 and 2020, we charged $3.8 million and $3.7 million, respectively, to compensation expense related to these awards. During the six‑month periods ended June 30, 2021 and 2020, we charged $6.5 million and $6.0 million, respectively, to compensation expense related to these awards.

In the first quarters of 2021 and 2020, the compensation committee approved $3.2 million and $1.8 million, respectively, of awards under the sub-plans referred to above, which were contributed to the rabbi trust in the first quarters of 2021 and 2020, respectively.  During the three-month periods ended June 30, 2021 and 2020, we charged $0.7 million to compensation expense related to these awards.  During the six-month periods ended June 30, 2021 and 2020, we charged $1.4 million to compensation expense related to these awards.  There were no distributions from the sub-plans during the six-month periods ended June 30, 2021 and 2020.

At June 30, 2021 and December 31, 2020, we recorded $78.9 million (related to 2.7 million shares) and $60.5 million (related to 2.6 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, 2021 and December 31, 2020 was $383.3 million and $327.8 million, respectively.  During the six-month period ended June 30, 2021, cash and equity awards with an aggregate fair value of $4.8 million were vested and distributed to executives under the DEPP.  During the six-month period ended June 30, 2020, cash and equity awards with an aggregate fair value of $9.8 million 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 2021 and 2020, the compensation committee approved $7.2 million and $3.0 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in the second quarters of 2021 and 2020, respectively.  During the three-month periods ended June 30, 2021 and 2020, we charged $2.1 million and $1.7 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2021 and 2020, we charged $4.1 million and $3.4 million, respectively, to compensation expense related to these awards.  There were $6.7 million and $7.3 million of distributions from the DCPP during the six-month periods ended June 30, 2021 and 2020, respectively.

11.  Restricted Stock, Performance Share and Cash Awards

Restricted Stock Awards

As discussed in Note 9 to these unaudited consolidated financial statements, on May 16, 2017, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2014 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

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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, 2021, 1.8 million shares were available for grant under the LTIP for such awards.

In the first quarters of 2021 and 2020, we granted 314,000 and 405,900 restricted stock units, respectively, to employees under the LTIP, with an aggregate fair value of $40.1 million and $34.9 million, respectively, at the date of grant.  These 2021 and 2020 awards of restricted stock units vest in full based on continued employment through March 16, 2026 and March 12, 2025, respectively. For our executive officers age 55 or older, restricted stock units are not subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.  

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 value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements.  During the three‑month periods ended June 30, 2021 and 2020, we recognized $7.6 million and $6.6 million, respectively, to compensation expense related to restricted stock unit awards granted in 2015 through 2021. During the six-month periods ended June 30, 2021 and 2020, we recognized $13.5 million and $11.5 million, respectively, to compensation expense related to restricted stock unit awards granted in 2015 through 2021.  The total intrinsic value of unvested restricted stock units at June 30, 2021 and 2020 was $269.7 million and $207.4 million, respectively. During the three-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate value of $1.3 million and $0.8 million, respectively, were vested and distributed to employees under this plan. During the six-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate value of $48.1 million and $30.6 million, respectively, were vested and distributed to employees under this plan.    

Performance Share Awards

On March 16, 2021 and March 12, 2020, pursuant to the LTIP, the compensation committee approved 67,000 and 82,500, respectively, of provisional performance share awards, with an aggregate fair value of $8.6 million and $7.1 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 2021 Proxy Statement). Earned shares for the 2021 and 2020 provisional awards will fully vest based on continuous employment through March 16, 2024 and March 12, 2023, respectively, and will be settled in unrestricted shares of our common stock on a one-for-one basis as soon as practicable thereafter.  The 2021 and 2020 awards are subject to a three-year performance period that began on January 1, 2021 and 2020, respectively, and vest on the three-year anniversary of the date of grant (March 16, 2024 and March 12, 2023). For certain of our executive officers age 55 or older, awards are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.  During the three-month periods ended June 30, 2021 and 2020, we recognized $3.2 million and $2.4 million, respectively, to compensation expense related to performance share awards granted in 2017 through 2021.  During the six-month periods ended June 30, 2021 and 2020, we recognized $6.2 million and $8.5 million, respectively, to compensation expense related to performance share awards granted in 2017 through 2021.  The total intrinsic value of unvested performance share awards at June 30, 2021 and 2020 was $55.0 million and $28.6 million, respectively.  During the six-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate fair value of $19.1 million and $12.5 million, respectively, were vested and distributed to employees under this plan.

Cash Awards

On March 16, 2021, pursuant to our Performance Unit Program (which we refer to as 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.  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 EBITAC 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 for the 2021 provisional award will fully vest based on continuous employment through January 1, 2024.  The ultimate award value will be equal to the trailing twelve-month price of our common stock on December 31, 2023, 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 in 2024.  If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited.  We did not recognize any compensation expense during the six-month period ended June 30, 2021 related to the 2021 provisional award under the Program.  

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On March 12, 2020, pursuant to the Program, the compensation committee approved provisional cash awards of $18.4 million in the aggregate for future grants to our officers and key employees that are denominated in units (213,000 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.  Terms of the 2020 provisional awards were similar to the terms of the 2021 provisional awards.  Based on our performance for 2020, we granted 208,000 units under the Program in the first quarter of 2021 that will fully vest on January 1, 2023.  During the three and six-month periods ended June 30, 2021, we recognized $2.3 million and $5.2 million, respectively, to compensation expense related to these awards. 

On March 14, 2019, pursuant to the Program, the compensation committee approved provisional cash awards of $16.5 million in the aggregate for future grants to our officers and key employees that are denominated in units (206,800 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.  Terms of the 2019 provisional awards were similar to the terms of the 2020 provisional awards.  Based on our performance for 2019, we granted 200,000 units under the Program in the first quarter of 2020 that will fully vest on January 1, 2022.  During the three-month periods ended June 30, 2021 and 2020, we recognized $1.9 million and $1.9 million to compensation expense related to these awards, respectively.  During the six-month periods ended June 30, 2021 and 2020, we recognized $5.1 million and $4.1 million, respectively, to compensation expense related to these awards,

On March 15, 2018, pursuant to the Program, the compensation committee approved provisional cash awards of $15.0 million in the aggregate for future grants to our officers and key employees denominated in units (219,000 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.  Terms of the 2018 provisional awards were similar to the terms of the 2019 provisional awards.  Based on our performance, we granted 190,000 units under the Program in the first quarter of 2019 that fully vested on January 1, 2021.  During the three and six-month periods ended June 30, 2020, we recognized $0.9 million and $3.5 million, respectively, to compensation expense related to these awards.  

During the six-month period ended June 30, 2021, cash awards related to the 2018 provisional award with an aggregate fair value of $17.7 million (176,300 units in the aggregate) were vested and distributed to employees under the Program.  During the six-month period ended June 30, 2020, cash awards related to the 2017 provisional award with an aggregate fair value of $18.9 million (221,600 units in the aggregate) were vested and distributed to employees under the Program.    

12.  Investments

The following is a summary of our investments included in other noncurrent assets in the consolidated balance sheet and the related funding commitments (in millions):

	June 30, 2021				December 31, 2020
			Funding
	Assets		Commitments		Assets
Chem-Mod LLC	$	4.0	$	—	$	4.0
Chem-Mod International LLC		2.0		—		2.0
Clean-coal investments:
Non-controlling interest in a limited liability company that owns one    2011 Era Clean Coal Plant		0.1		—		0.1
Controlling interest in limited liability companies that own twenty    2011 Era Clean Coal Plants		6.1		—		12.4
Other investments		4.9		1.0		3.9
Total investments	$	17.1	$	1.0	$	22.4

13.  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

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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, 2021.

The notional and fair values of derivatives designated as hedging instruments are as follows at June 30, 2021 and December 31, 2020 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2021
Interest rate contracts	$	1,000.0	Other current assets	$	4.2	Accrued compensation and other current liabilities	$	2.0
			Other noncurrent assets		4.1	Other noncurrent liabilities		8.2
Foreign exchange contracts (1)		26.5	Other current assets		6.6	Accrued compensation and other current liabilities		0.5
			Other noncurrent assets		3.8	Other noncurrent liabilities		3.6
Total	$	1,026.5		$	18.7		$	14.3
At December 31, 2020
Interest rate contracts	$	550.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	54.5
			Other noncurrent assets		—	Other noncurrent liabilities		10.9
Foreign exchange contracts (1)		48.6	Other current assets		5.9	Accrued compensation and other current liabilities		0.6
			Other noncurrent assets		7.8	Other noncurrent liabilities		3.3
Total	$	598.6		$	13.7		$	69.3

(1) Included within foreign exchange contracts at June 30, 2021 were $408.3 million of call options, offset with $408.3 million of put options, and $13.7 million of buy forwards, offset with $40.2 million of sell forwards.  Included within foreign exchange contracts at December 31, 2020 were $354.7 million of call options offset, with $354.7 million of put options, and $9.0 million of buy forwards, offset with $57.6 million of sell forwards.

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The effect of cash flow hedge accounting on accumulated other comprehensive loss for the three and six-month periods ended June 30, 2021 and 2020 were as follows (in millions):

							Amount of
				Amount of			Gain (Loss)
				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, 2021
Interest rate contracts	$	(41.7	)	$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		(4.4	)		(1.4	)		(0.1	)	Commission revenue
					(0.2	)		0.2		Compensation expense
					(0.1	)		0.2		Operating expense
Total	$	(46.1	)	$	(2.0	)	$	0.3
Three-month period ended June 30, 2020
Interest rate contracts	$	6.1		$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		2.0			(0.1	)		(0.1	)	Commission revenue
					(0.5	)		0.4		Compensation expense
					(0.4	)		0.2		Operating expense
Total	$	8.1		$	(1.3	)	$	0.5
Six-month period ended June 30, 2021
Interest rate contracts	$	34.1		$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(6.1	)		(2.3	)		(0.2	)	Commission revenue
					(0.5	)		0.6		Compensation expense
					(0.3	)		0.5		Operating expense
Total	$	28.0		$	(3.7	)	$	0.9
Six-month period ended June 30, 2020
Interest rate contracts	$	(108.1	)	$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(17.3	)		(0.5	)		(0.3	)	Commission revenue
					(0.8	)		0.6		Compensation expense
					(0.6	)		0.4		Operating expense
Total	$	(125.4	)	$	(2.5	)	$	0.7

(1) For the three and six-month periods ended June 30, 2021 and 2020, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of zero and $1.2 million, respectively.  

We estimate that approximately $5.7 million of pretax loss currently included within accumulated other comprehensive loss will be reclassified into earnings in the next twelve months.  

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14.  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, 2021 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2021			2022			2023			2024			2025			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	1,500.0		$	1,500.0
Note purchase agreements		—			200.0			250.0			475.0			200.0			3,323.0			4,448.0
Credit Agreement		—			—			—			—			—			—			—
Premium Financing Debt Facility		166.1			—			—			—			—			—			166.1
Interest on debt		119.1			234.0			224.9			208.3			193.6			1,496.3			2,476.2
Total debt obligations		285.2			434.0			474.9			683.3			393.6			6,319.3			8,590.3
Operating lease obligations		52.9			101.8			81.8			59.7			45.3			87.6			429.1
Less sublease arrangements		(0.1	)		(0.3	)		(0.3	)		(0.3	)		(0.2	)		(0.5	)		(1.7	)
Outstanding purchase obligations		57.0			60.1			40.0			29.4			21.7			33.0			241.2
Total contractual obligations	$	395.0		$	595.6		$	596.4		$	772.1		$	460.4		$	6,439.4		$	9,258.9

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 7 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.  On July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes (which is described in further detail in Note 7).  These notes will be redeemed on August 13, 2021.

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 and will accommodate approximately 2,000 employees at peak pre-pandemic capacity.

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 - We typically do not have a material amount of outstanding purchase obligations at any point in time.  The amount disclosed in the contractual obligations table above represents the aggregate amount of unrecorded purchase obligations that we had outstanding at June 30, 2021. 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, 2021 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2021		2022		2023		2024		2025		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	15.2	$	15.2
Financial guarantees		0.1		0.2		0.2		0.2		0.2		0.2		1.1
Funding commitments		1.0		—		—		—		—		—		1.0
Total commitments	$	1.1	$	0.2	$	0.2	$	0.2	$	0.2	$	15.4	$	17.3

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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 597 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 2017 to 2021 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 $1,068.1 million, of which $560.1 million was recorded in our consolidated balance sheet as of June 30, 2021 based on the estimated fair value of the expected future payments to be made, of which approximately $536.2 million can be settled in cash or stock at our option and $23.9 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, 2021 or December 31, 2020, that was recourse to us.

At June 30, 2021, we had posted two letters of credit totaling $9.4 million, in the aggregate, related to our self‑insurance deductibles, for which we had a recorded liability of $18.0 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, 2021, we had posted six letters of credit totaling $4.3 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 $1.0 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 are a defendant in various legal actions incidental to the nature of our business including but not limited to matters related to employment practices, alleged breaches of non‑compete or other restrictive covenants, theft of trade secrets, breaches of fiduciary duties and related causes of action.  We are also periodically the subject of inquiries, investigations and reviews by regulatory and taxing authorities into various matters related to our business, including our operational, compliance and finance functions.  Neither the outcomes of these matters nor their effect upon our business, financial condition or results of operations can be determined at this time.

On July 17, 2019, Midwest Energy Emissions Corp. and MES Inc. (which we refer to together as Midwest Energy) filed a patent infringement lawsuit in the United States District Court for the District of Delaware against us, Chem‑Mod LLC and numerous other related and unrelated parties.  The complaint alleges that the named defendants’ infringe patents held exclusively by Midwest Energy and seeks unspecified damages and injunctive relief.  On May 20, 2021, the court issued a ruling on our motion to dismiss the plaintiffs’ second amended complaint.  The court granted in part and denied in part the relief we sought in our motion.  We continue to defend this matter vigorously.  Litigation is inherently uncertain and it is not possible for us to predict the ultimate outcome of this matter and the financial impact to us.  We believe the probability of a material loss is remote.

As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services businesses has been under investigation by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promotor in connection with these operations.  Additionally, the IRS has initiated audits for the 2012 tax year, and subsequent tax years, of over 100 of the micro-captive underwriting enterprises organized and/or managed by us.

In May 2020, we learned that the Department of Justice (DOJ) began conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not currently a target of the investigation. In June 2020 our subsidiary Artex Risk Solutions, Inc. (which we refer to as Artex) received a grand jury subpoena requesting documents relating to its micro‑captive advisory business. We have produced documents in response to the subpoena.  We are fully cooperating with both the IRS investigation and the DOJ investigation. We are not able to reasonably estimate the amount of any potential loss in connection with these investigations.

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On December 7, 2018, a class action lawsuit was filed against us, Artex and other defendants, in the United States District Court for the District of Arizona. The named plaintiffs were micro-captives and related entities and owners who had IRC Section 831(b) tax benefits disallowed by the IRS. The complaint alleged that the defendants defrauded the plaintiffs by marketing and managing micro-captives with the knowledge that the captives did not constitute bona fide insurance and thus would not qualify for tax benefits.  On August 5, 2019, the trial court granted the defendants’ motion to compel arbitration and dismissed the class action lawsuit.  Plaintiffs appealed this ruling to the United States Court of Appeals for the Ninth Circuit.  On September 9, 2020, the Ninth Circuit Court affirmed the ruling of the trial court dismissing the class action lawsuit.  On March 17, 2021, plaintiffs filed a petition for writ of certiorari with the United States Supreme Court.  On June 28, 2021, the United States Supreme Court denied the plaintiffs’ petition for a writ of certiorari.  This ruling concluded the class action lawsuit in our favor.

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 $10.0 million of every E&O claim up to $10.0 million.  In addition, we retain, in aggregate: up to another $4.5 million between $10.0 million and $100.0 million, plus up to another $20.0 million between $100.0 million and $240.0 million, and up to another $27.0 million between $240.0 million and $350.0 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, 2021 consolidated balance sheet is above the lower end of the most recently determined actuarial range by $3.1 million and below the upper end of the actuarial range by $7.2 million.  In addition to this E&O reserve, in the six-month period ended June 30, 2021, we established provisions for potential unusual pandemic related claim defense and other costs.  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, 2021, we had exposure on $108.0 million of previously earned tax credits.  Under the TCJA, 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, 2021 consolidated balance sheet related to this exposure.

15.  Supplemental Disclosures of Cash Flow Information

	Six-month period ended June 30,
Supplemental disclosures of cash flow information (in millions):	2021		2020
Interest paid	$	95.8	$	91.7
Income taxes paid, net		115.3		20.0

The following is a reconciliation of our end of period cash, cash equivalents and restricted cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2021 and 2020 (in millions):

	June 30,
	2021		2020
Cash and cash equivalents	$	3,204.1	$	349.7
Restricted cash		3,170.9		2,653.0
Total cash, cash equivalents and restricted cash	$	6,375.0	$	3,002.7

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

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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) $34.5 million and $30.3  million related to the plan in the six-month periods ended June 30, 2021 and 2020, respectively.  Our board of directors authorized the use of common stock to fund our 2020 employer matching contributions to the 401(k) plan, which we funded in February 2021.  During second quarter 2021, our board of directors authorized a 5.0% employer match on eligible compensation to the 401(k) plan for the 2021 plan year and the possible use of common stock to fund our 2021 employer matching contributions, which is expected to be funded in February 2022.

16.  Accumulated Other Comprehensive Loss

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

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2020	$	(56.1	)	$	(491.1	)	$	(96.4	)	$	(643.6	)
Net change in period		1.1			88.4			23.6			113.1
Balance as of June 30, 2021	$	(55.0	)	$	(402.7	)	$	(72.8	)	$	(530.5	)

The foreign currency translation during the six-month period ended June 30, 2021 primarily 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 U.K., Australia, Canada, New Zealand, the Caribbean, India and other non-U.S. locations.  

During the six-month periods ended June 30, 2021 and 2020, $2.9 million and $3.1 million, respectively, of expense 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, 2021 and 2020, $3.7 million and $2.5 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, 2021 and 2020, no amounts related to foreign currency translation were reclassified from accumulated other comprehensive loss to the statement of earnings.  

17.  Segment Information

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

The brokerage segment is primarily comprised of our retail and wholesale insurance brokerage operations.  The brokerage segment 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 enterprises and public entities 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 translation.  

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 the local country statutory rates.  Reported operating results by segment would change if different methods were applied.

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Financial information relating to our segments for the three and six-month periods ended June 30, 2021 and 2020 is as follows (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Brokerage
Total revenues	$	1,390.2		$	1,201.1		$	3,000.4		$	2,636.7
Earnings before income taxes	$	299.7		$	247.8		$	780.0		$	658.6
Identifiable assets at June 30, 2021 and 2020							$	21,858.6		$	18,405.6
Risk Management
Total revenues	$	281.7		$	223.2		$	534.4		$	472.7
Earnings before income taxes	$	33.4		$	13.2		$	57.5		$	38.8
Identifiable assets at June 30, 2021 and 2020							$	1,058.5		$	929.1
Corporate
Total revenues	$	261.6		$	159.7		$	563.7		$	341.5
Loss before income taxes	$	(110.8	)	$	(89.3	)	$	(206.8	)	$	(169.7	)
Identifiable assets at June 30, 2021 and 2020							$	4,900.1		$	1,971.5
Total
Total revenues	$	1,933.5		$	1,584.0		$	4,098.5		$	3,450.9
Earnings before income taxes	$	222.3		$	171.7		$	630.7		$	527.7
Identifiable assets at June 30, 2021 and 2020							$	27,817.2		$	21,306.2

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, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	977.1	$	—	$	—	$	977.1
Fees		296.0		244.9		—		540.9
Supplemental revenues		55.2		—		—		55.2
Contingent revenues		43.3		—		—		43.3
Investment income		18.1		—		—		18.1
Net gains on divestitures		0.5		0.1		—		0.6
Revenues from clean coal activities		—		—		261.0		261.0
Other net revenues		—		—		0.6		0.6
Revenues before reimbursements		1,390.2		245.0		261.6		1,896.8
Reimbursements		—		36.7		—		36.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

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Revenues by type and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	2,102.5	$	—	$	—	$	2,102.5
Fees		629.6		465.1		—		1,094.7
Supplemental revenues		122.0		—		—		122.0
Contingent revenues		106.6		—		—		106.6
Investment income		35.1		0.1		—		35.2
Net gains on divestitures		4.6		0.1		—		4.7
Revenues from clean coal activities		—		—		561.6		561.6
Other net revenues		—		—		2.1		2.1
Revenues before reimbursements		3,000.4		465.3		563.7		4,029.4
Reimbursements		—		69.1		—		69.1
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

Revenues by geographical location and segment for the three-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	812.4	$	231.5	$	261.6	$	1,305.5
United Kingdom		326.1		11.8		—		337.9
Australia		70.7		33.0		—		103.7
Canada		79.9		1.4		—		81.3
New Zealand		45.4		4.0		—		49.4
Other foreign		55.7		—		—		55.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

Revenues by geographical location and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,919.0	$	439.0	$	563.7	$	2,921.7
United Kingdom		618.5		22.9		—		641.4
Australia		124.7		62.0		—		186.7
Canada		147.4		2.8		—		150.2
New Zealand		77.9		7.7		—		85.6
Other foreign		112.9		—		—		112.9
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

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Revenues by type and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	827.5	$	—	$	—	$	827.5
Fees		269.1		190.6		—		459.7
Supplemental revenues		50.3		—		—		50.3
Contingent revenues		37.4		—		—		37.4
Investment income		15.8		0.2		—		16.0
Net gains on divestitures		1.0		—		—		1.0
Revenues from clean coal activities		—		—		159.5		159.5
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		1,201.1		190.8		159.7		1,551.6
Reimbursements		—		32.4		—		32.4
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

Revenues by type and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,844.7	$	—	$	—	$	1,844.7
Fees		564.9		402.1		—		967.0
Supplemental revenues		109.3		—		—		109.3
Contingent revenues		82.5		—		—		82.5
Investment income		34.1		0.5		—		34.6
Net gains on divestitures		1.2		—		—		1.2
Revenues from clean coal activities		—		—		341.3		341.3
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		2,636.7		402.6		341.5		3,380.8
Reimbursements		—		70.1		—		70.1
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

Revenues by geographical location and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	740.8	$	185.6	$	159.7	$	1,086.1
United Kingdom		260.9		8.2		—		269.1
Australia		56.9		24.7		—		81.6
Canada		58.2		1.5		—		59.7
New Zealand		38.0		3.2		—		41.2
Other foreign		46.3		—		—		46.3
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

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Revenues by geographical location and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,746.7	$	398.3	$	341.5	$	2,486.5
United Kingdom		515.4		19.6		—		535.0
Australia		100.0		46.3		—		146.3
Canada		114.4		2.5		—		116.9
New Zealand		66.0		6.0		—		72.0
Other foreign		94.2		—		—		94.2
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

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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 three and six-month periods ended June 30, 2021. Readers should review this information in conjunction with the June 30, 2021 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, 2020.

Prior Year Discussion of Results and Comparisons

For Information on fiscal second quarter 2020 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, 2020.

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 revenues, 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 because they provide investors with measures that our chief operating decision maker uses when reviewing the company’s performance, and for the other reasons described below. 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. 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 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 of our large acquisitions, 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, extra lease space, duplicate services and external costs incurred to assimilate the acquisition with our IT related systems.

• Transaction-related costs associated with the due diligence related to the now terminated agreement to acquire certain assets of Willis Towers Watson plc.

• 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, which include change in estimated acquisition earnout payables adjustments, impairment charges and acquisition related compensation charges.  

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• 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.

• U.K.-related tax-rate change, which represents the impact in second quarter 2021 of one-time income tax expense associated with the change in the U.K. effective income tax rate from 19% to 25% that is effective in 2023.

• 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 and adjusted EPS for the brokerage and risk management segment, 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.

• Adjusted EBITDAC and Adjusted EBITDAC Margin - Adjusted EBITDAC is EBITDAC adjusted to exclude net gains on divestitures, acquisition integration costs, workforce related charges, lease termination related charges, acquisition related adjustments, 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.

• Adjusted EPS and Adjusted Net Earnings - Adjusted net earnings have been adjusted to exclude the after-tax impact of net gains on divestitures, acquisition integration costs, the impact of foreign currency translation, workforce related charges, lease termination related charges, acquisition related adjustments 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 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 exclude the period‑over‑period impact of foreign currency translation to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability.  For the risk management segment, organic change in fee revenues excludes the first twelve months of fee revenues generated from acquisitions in each year presented.  In addition, change in organic growth excludes the period-over-period impact of foreign currency translation to improve the comparability of our results between periods by eliminating the impact of the items that have a high degree of variability.

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.  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 48 and 55), for adjusted revenues, adjusted EBITDAC and adjusted diluted net earnings per share (on pages 42 and 43), for organic revenue measures (on pages 50 and 55), respectively, for the brokerage and risk management segments), for adjusted EBITDAC margin, adjusted compensation expense

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and operating expenses, (on pages 49, 51 and 52, respectively, for the brokerage segment and on pages 55, 56 and 57, respectively, 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.  As a result, the provision for income taxes for the corporate segment reflects the entire benefit to us of the IRC Section 45 tax credits produced, because that is the segment which generated the credits.  The law that provides for IRC Section 45 tax credits expired in December 2019 for our fourteen plants placed in service prior to December 31, 2009 (which we refer to as the 2009 Era Plants) and will expire in December 2021 for our twenty-one plants placed in service prior to December 31, 2011 (which we refer to as the 2011 Era Plants).  We anticipate reporting an effective tax rate of approximately 23.0% to 25.0% in the brokerage segment and 24.0% to 26.0% in the risk management segment for the foreseeable future.  Reported operating results by segment would change if different allocation methods were applied.  When the law governing IRC Section 45 tax credits expires, reported GAAP revenues and net earnings will decrease, yet our net cash flow will increase as a result of not having to pay expenses to operate the clean coal facilities and also from an increase in the use of credits against our U.S. federal income tax obligations.

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 2021 Highlights

We are engaged in providing insurance brokerage and consulting services, and third-party property/casualty claims settlement and administration services to entities in the U.S. and abroad.  In the six-month period ended June 30, 2021, we generated approximately 67% of our revenues for the combined brokerage and risk management segments domestically and 33% internationally, primarily in Australia, Bermuda, Canada, the Caribbean, New Zealand and the U.K.  We have three reportable segments: brokerage, risk management and corporate, which contributed approximately 73%, 13% and 14%, respectively, to revenues during the six-month period ended June 30, 2021.  Our major sources of operating revenues are commissions, fees and supplemental and contingent revenues from brokerage operations and fees from risk management operations.  Investment income is generated from invested cash and fiduciary funds, clean energy and other investments, and interest income from premium financing.

We typically cite the Council of Insurance Agents and Brokers (which we refer to as CIAB) insurance pricing quarterly survey at this time as an indicator of the current insurance rate environment.  The second quarter 2021 survey had not been published as of the filing date of this report.  The first quarter 2021 survey indicated that commercial property/casualty rates increased by 10.0% on average.  We expect a similar trend to be noted when the CIAB second quarter 2021 survey report is issued, which would indicate overall continued price firming and hardening in some lines.  The CIAB represents the leading domestic and international insurance brokers, who write approximately 85% of the commercial property/casualty premiums in the U.S.

We believe increases in property/casualty rates will continue for the remainder of 2021; and if loss trends deteriorate over the coming quarters, it could lead to a more difficult rate and conditions environment in certain lines.  The economies of the U.S. and other countries around the world contracted during 2020 as a result of COVID-19, and while second quarter 2021 economic activity improved relative to the last three quarters of 2020 and first quarter 2021, activity has yet to rebound to pre-pandemic levels.  The improving level of economic activity is leading to, and is likely to continue to lead to, higher exposure units and lower unemployment.  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 growing exposure units, 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’ budget.  Based on our experience, there is adequate capacity in the insurance market for most lines of coverage, terms and conditions are tightening, most insurance carriers appear to be making rational pricing decisions and clients can broadly still obtain coverage.  Please also refer to the section entitled “Impact of COVID-19 Pandemic Recovery” below on page 46.

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Summary of Financial Results - Three-Month Periods Ended June 30, 2021 and 2020

See the reconciliations of non-GAAP measures on page 44.

(Dollars in millions, except per share data)	2nd Quarter 2021						2nd Quarter 2020						Change
	Reported			Adjusted			Reported			Adjusted			Reported			Adjusted
	GAAP			Non-GAAP			GAAP			Non-GAAP			GAAP			Non-GAAP
Brokerage Segment
Revenues	$	1,390.2		$	1,389.7		$	1,201.1		$	1,250.6			16	%		11	%
Organic revenues				$	1,312.1					$	1,228.2						6.8	%
Net earnings	$	227.6					$	190.2						20	%
Net earnings margin		16.4	%					15.8	%				+ 54 bpts
Adjusted EBITDAC				$	457.5					$	408.8						12	%
Adjusted EBITDAC margin					32.9	%					32.7	%				+ 23 bpts
Diluted net earnings per share	$	1.09		$	1.21		$	0.97		$	1.14			12	%		7	%
Risk Management Segment
Revenues before reimbursements	$	245.0		$	244.9		$	190.8		$	195.2			28	%		25	%
Organic revenues				$	233.3					$	195.0						19.6	%
Net earnings	$	24.9					$	9.9						152	%
Net earnings margin (before reimbursements)		10.2	%					5.2	%				+ 510 bpts
Adjusted EBITDAC				$	48.3					$	34.2						41	%
Adjusted EBITDAC margin (before reimbursements)					19.7	%					17.5	%				+ 220 bpts
Diluted net earnings per share	$	0.12		$	0.12		$	0.05		$	0.08			140	%		59	%
Corporate Segment
Diluted net loss per share	$	(0.29	)	$	(0.16	)	$	(0.23	)	$	(0.23	)
Total Company
Diluted net earnings per share	$	0.92		$	1.17		$	0.79		$	0.99			16	%		18	%
Total Brokerage and Risk Management Segment
Diluted net earnings per share	$	1.21		$	1.33		$	1.02		$	1.22			19	%		9	%

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Summary of Financial Results - Six-Month Periods Ended June 30, 2021 and 2020

See the reconciliations of non-GAAP measures on page 45.

(Dollars in millions, except per share data)	Six-Months 2021						Six-Months 2020						Change
	Reported			Adjusted			Reported			Adjusted			Reported			Adjusted
	GAAP			Non-GAAP			GAAP			Non-GAAP			GAAP			Non-GAAP
Brokerage Segment
Revenues	$	3,000.4		$	2,995.8		$	2,636.7		$	2,725.1			14	%		10	%
Organic revenues				$	2,849.0					$	2,678.5						6.4	%
Net earnings	$	592.0					$	501.6						18	%
Net earnings margin		19.7	%					19.0	%				+ 71 bpts
Adjusted EBITDAC				$	1,087.2					$	916.1						19	%
Adjusted EBITDAC margin					36.3	%					33.6	%				+ 267 bpts
Diluted net earnings per share	$	2.90		$	3.10		$	2.58		$	2.82			13	%		11	%
Risk Management Segment
Revenues before reimbursements	$	465.3		$	465.2		$	402.6		$	413.3			16	%		13	%
Organic revenues				$	452.4					$	412.8						9.6	%
Net earnings	$	42.9					$	29.0						48	%
Net earnings margin (before reimbursements)		9.2	%					7.2	%				+ 221 bpts
Adjusted EBITDAC				$	88.8					$	70.4						26	%
Adjusted EBITDAC margin (before reimbursements)					19.1	%					17.0	%				+ 205 bpts
Diluted net earnings per share	$	0.21		$	0.23		$	0.15		$	0.17			41	%		33	%
Corporate Segment
Diluted net loss per share	$	(0.28	)	$	(0.15	)	$	(0.15	)	$	(0.15	)
Total Company
Diluted net earnings per share	$	2.83		$	3.18		$	2.58		$	2.84			10	%		12	%
Total Brokerage and Risk Management Segment
Diluted net earnings per share	$	3.11		$	3.33		$	2.73		$	2.99			14	%		11	%

In our corporate segment, net after-tax earnings from our clean energy investments were $20.8 million and $5.0 million, as reported, in the three-month periods ended June 30, 2021 and 2020, respectively.  In our corporate segment, net after-tax earnings from our clean energy investments were $54.2 million and $57.5 million, as reported, in the six-month periods ended June 30, 2021 and 2020, respectively.  We anticipate our clean energy investments to generate between $75.0 million and $85.0 million in adjusted net earnings in 2021.  See “Impact of COVID-19 Pandemic Recovery” on page 46.  We expect to use the additional cash flow generated by these earnings to continue our mergers and acquisition strategy in our core brokerage and risk management operations.

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, 2021 with the same periods in 2020.  In addition, these tables provide reconciliations to the most comparable GAAP measures for adjusted revenues, adjusted EBITDAC and adjusted diluted net earnings per share.  Reconciliations of EBITDAC for the brokerage and risk management segments are provided on pages 49 and 55, respectively, of this filing.

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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	2021			2020			2021			2020			2021			2020			2021			2020			Chg
	(in millions)						(in millions)						(in millions)
Brokerage, as reported	$	1,390.2		$	1,201.1		$	227.6		$	190.2		$	440.0		$	366.5		$	1.09		$	0.97			12	%
Net gains on divestitures		(0.5	)		(1.0	)		(0.4	)		(0.8	)		(0.5	)		(1.0	)		—			—
Acquisition integration					—			4.7			5.1			6.2			6.7		0.02				0.02
Workforce and lease termination		—			—			3.1			11.5			4.1			15.0			0.02			0.06
Acquisition related adjustments		—			—			15.3			8.3			7.7			4.1			0.08			0.04
Levelized foreign currency    translation		—			50.5			—			8.9			—			17.5			—			0.05
Brokerage, as adjusted *		1,389.7			1,250.6			250.3			223.2			457.5			408.8			1.21			1.14			7	%
Risk Management, as reported		245.0			190.8			24.9			9.9			47.6			28.5		0.12				0.05			140	%
Net gains on divestitures		(0.1	)		—			(0.1	)		—			(0.1	)		—			—			—
Workforce and lease termination		—			—			0.5			3.7			0.6			5.0			—			0.02
Acquisition related adjustments		—			—			0.3			1.1			0.2			—			—			0.01
Levelized foreign currency    translation		—			4.4			—			0.1			—			0.7			—			—
Risk Management, as adjusted *		244.9			195.2			25.6			14.8			48.3			34.2			0.12			0.08			59	%
Corporate, as reported		261.6			159.7			(50.7	)		(38.3	)		(50.1	)		(35.0	)		(0.29	)		(0.23	)
Transaction-related costs		—			—			8.7			—			10.2			—			0.04			—
U.K.-related rate change		—			—			19.3			—			—			—			0.09			—
Corporate, as adjusted*		261.6			159.7			(22.7	)		(38.3	)		(39.9	)		(35.0	)		(0.16	)		(0.23	)
Total Company, as reported	$	1,896.8		$	1,551.6		$	201.8		$	161.8		$	437.5		$	360.0		$	0.92		$	0.79			16	%
Total Company, as adjusted *	$	1,896.2		$	1,605.5		$	253.2		$	199.7		$	465.9		$	408.0		$	1.17		$	0.99			18	%
Total Brokerage & Risk
Management, as reported	$	1,635.2		$	1,391.9		$	252.5		$	200.1		$	487.6		$	395.0		$	1.21		$	1.02			19	%
Total Brokerage & Risk
Management, as adjusted *	$	1,634.6		$	1,445.8		$	275.8		$	238.0		$	505.8		$	443.0		$	1.33		$	1.22			9	%

* For three-month period ended June 30, 2021, the pretax impact of the brokerage segment adjustments totals $30.0 million, with a corresponding adjustment to the provision for income taxes of $7.3 million relating to these items.  For the three-month period ended June 30, 2021, the pretax impact of the risk management segment adjustments totals $0.8 million, with a corresponding adjustment to the provision for income taxes of $0.1 million relating to these items.  For the three-month period ended June 30, 2021, the pretax impact of the corporate segment adjustments totals $10.2 million, with a corresponding adjustment to the benefit for income taxes of $(17.8) million relating to this item and the U.K. tax item noted on page 61 in note (2).  A detailed reconciliation of the 2021 provision for income taxes is shown on page 44.

* For the three-month period ended June 30, 2020, the pretax impact of the brokerage segment adjustments totals $43.1 million, with a corresponding adjustment to the provision for income taxes of $10.1 million relating to these items.  For the three-month period ended June 30, 2020, the pretax impact of the risk management segment adjustments totals $6.7 million, with a corresponding adjustment to the provision for income taxes of $1.8 million relating to these items.  A detailed reconciliation of the 2020 provision for income taxes is shown on page 44.

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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	2021			2020			2021			2020			2021			2020			2021			2020			Chg
	(in millions)						(in millions)						(in millions)
Brokerage, as reported	$	3,000.4		$	2,636.7		$	592.0		$	501.6		$	1,058.4		$	844.4		$	2.90		$	2.58			13	%
Net gains on divestitures		(4.6	)		(1.2	)		(3.6	)		(1.0	)		(4.6	)		(1.2	)		(0.02	)		—
Acquisition integration		—			—			7.9			10.2			10.3			13.4			0.04			0.05
Workforce and lease termination		—			—			8.6			16.5			9.3			21.5			0.04			0.09
Acquisition related adjustments		—			—			27.0			6.2			13.8			8.7			0.14			0.03
Levelized foreign currency    translation		—			89.6			—			14.3			—			29.3			—			0.07
Brokerage, as adjusted *		2,995.8			2,725.1			631.9			547.8			1,087.2			916.1			3.10			2.82			11	%
Risk Management, as reported		465.3			402.6			42.9			29.0			87.4			63.5			0.21			0.15			41	%
Net gains on divestitures		(0.1	)		—			(0.1	)		—			(0.1	)		—			—			—
Workforce and lease termination		—			—			1.0			3.9			1.3			5.3			0.01			0.02
Acquisition related adjustments		—			—			2.1			0.9			0.2			—			0.01			—
Levelized foreign currency    translation		—			10.7			—			0.3			—			1.6			—			—
Risk Management, as adjusted *		465.2			413.3			45.9			34.1			88.8			70.4			0.23			0.17			33	%
Corporate, as reported		563.7			341.5			(39.4	)		(13.4	)		(93.5	)		(58.0	)		(0.28	)		(0.15	)
Transaction-related costs		—			—			8.7			—			10.2			—			0.04			—
U.K.-related tax rate change		—			—			19.3			—			—			—			0.09			—
Corporate, as adjusted*		563.7			341.5			(11.4	)		(13.4	)		(83.3	)		(58.0	)		(0.15	)		(0.15	)
Total Company, as reported	$	4,029.4		$	3,380.8		$	595.5		$	517.2		$	1,052.3		$	849.9		$	2.83		$	2.58			10	%
Total Company, as adjusted *	$	4,024.7		$	3,479.9		$	666.4		$	568.5		$	1,092.7		$	928.5		$	3.18		$	2.84			12	%
Total Brokerage & Risk
Management, as reported	$	3,465.7		$	3,039.3		$	634.9		$	530.6		$	1,145.8		$	907.9		$	3.11		$	2.73			14	%
Total Brokerage & Risk
Management, as adjusted *	$	3,461.0		$	3,138.4		$	677.8		$	581.9		$	1,176.0		$	986.5		$	3.33		$	2.99			11	%

* For, the six-month period ended June 30, 2021, the pretax impact of the brokerage segment adjustments totals $51.8 million, with a corresponding adjustment to the provision for income taxes of $11.9 million relating to these items.  For the six-month period ended June 30, 2021, the pretax impact of the risk management segment adjustments totals $3.9 million, with a corresponding adjustment to the provision for income taxes of $0.9 million relating to these items. For the six-month period ended June 30, 2021, the pretax impact of the corporate segment adjustments totals $10.2 million, with a corresponding adjustment to the benefit for income taxes of $(17.8) million relating to this item and the U.K. tax item noted on page 61 in note (2). A detailed reconciliation of the 2021 provision for income taxes is shown on page 45.

* For the six-month period ended June 30, 2020, the pretax impact of the brokerage segment adjustments totals $60.4 million, with a corresponding adjustment to the provision for income taxes of $14.2 million relating to these items.  For the six-month period ended June 30, 2020, the pretax impact of the risk management segment adjustments totals $7.0 million, with a corresponding adjustment to the provision for income taxes of $1.9 million relating to these items.  A detailed reconciliation of the 2020 provision for income taxes is shown on page 45.  

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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		Net Earnings (Loss)
	Before			(Benefit)						Attributable to		Attributable to			Diluted Net
	Income			for Income			Net			Noncontrolling		Controlling			Earnings (Loss)
	Taxes			Taxes			Earnings (Loss)			Interests		Interests			per Share
Quarter Ended June 30, 2021
Brokerage, as reported	$	299.7		$	72.1		$	227.6		$	2.6	$	225.0		$	1.09
Net gains on divestitures		(0.5	)		(0.1	)		(0.4	)		—		(0.4	)		—
Acquisition integration		6.2			1.5			4.7			—		4.7			0.02
Workforce and lease termination		4.1			1.0			3.1			—		3.1			0.02
Acquisition related adjustments		20.2			4.9			15.3			—		15.3			0.08
Brokerage, as adjusted	$	329.7		$	79.4		$	250.3		$	2.6	$	247.7		$	1.21
Risk Management, as reported	$	33.4		$	8.5		$	24.9		$	—	$	24.9		$	0.12
Net gains on divestitures		(0.1	)		—			(0.1	)		—		(0.1	)		—
Workforce and lease termination		0.6			0.1			0.5			—		0.5			—
Acquisition related adjustments		0.3			—			0.3			—		0.3			—
Risk Management, as adjusted	$	34.2		$	8.6		$	25.6		$	—	$	25.6		$	0.12
Corporate, as reported	$	(110.8	)	$	(60.1	)	$	(50.7	)	$	9.0	$	(59.7	)	$	(0.29	)
Transaction-related costs		10.2			1.5			8.7			—		8.7			0.04
U.K.-related tax rate change		—			(19.3	)		19.3			—		19.3			0.09
Corporate, as adjusted	$	(100.6	)	$	(77.9	)	$	(22.7	)	$	9.0	$	(31.7	)	$	(0.16	)
Quarter Ended June 30, 2020
Brokerage, as reported	$	247.8		$	57.6		$	190.2		$	1.5	$	188.7		$	0.97
Net gains on divestitures		(1.0	)		(0.2	)		(0.8	)		—		(0.8	)		—
Acquisition integration		6.7			1.6			5.1			—		5.1			0.02
Workforce and lease termination		15.0			3.5			11.5			—		11.5			0.06
Acquisition related adjustments		10.8			2.5			8.3			—		8.3			0.04
Levelized foreign currency translation		11.6			2.7			8.9			—		8.9			0.05
Brokerage, as adjusted	$	290.9		$	67.7		$	223.2		$	1.5	$	221.7		$	1.14
Risk Management, as reported	$	13.2		$	3.3		$	9.9		$	—	$	9.9		$	0.05
Workforce and lease termination		5.0			1.3			3.7			—		3.7			0.02
Acquisition related adjustments		1.5			0.4			1.1			—		1.1			0.01
Levelized foreign currency translation		0.2			0.1			0.1			—		0.1			—
Risk Management, as adjusted	$	19.9		$	5.1		$	14.8		$	—	$	14.8		$	0.08

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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		Net Earnings (Loss)
	Before			(Benefit)						Attributable to		Attributable to			Diluted Net
	Income			for Income			Net			Noncontrolling		Controlling			Earnings (Loss)
	Taxes			Taxes			Earnings			Interests		Interests			per Share
Six-Months Ended June 30, 2021
Brokerage, as reported	$	780.0		$	188.0		$	592.0		$	4.4	$	587.6		$	2.90
Net gains on divestitures		(4.6	)		(1.0	)		(3.6	)		—		(3.6	)		(0.02	)
Acquisition integration		10.3			2.4			7.9			—		7.9			0.04
Workforce and lease termination		9.3			0.7			8.6			—		8.6			0.04
Acquisition related adjustments		36.8			9.8			27.0			—		27.0			0.14
Brokerage, as adjusted	$	831.8		$	199.9		$	631.9		$	4.4	$	627.5		$	3.10
Risk Management, as reported	$	57.5		$	14.6		$	42.9		$	—	$	42.9		$	0.21
Net gains on divestitures		(0.1	)		—			(0.1	)		—		(0.1	)		—
Workforce and lease termination		1.3			0.3			1.0			—		1.0			0.01
Acquisition related adjustments		2.7			0.6			2.1			—		2.1			0.01
Risk Management, as adjusted	$	61.4		$	15.5		$	45.9		$	—	$	45.9		$	0.23
Corporate, as reported	$	(206.8	)	$	(167.4	)	$	(39.4	)	$	18.8	$	(58.2	)	$	(0.28	)
Transaction-related costs		10.2			1.5			8.7			—		8.7			0.04
U.K.-related tax rate change		—			(19.3	)		19.3			—		19.3			0.09
Corporate, as adjusted	$	(196.6	)	$	(185.2	)	$	(11.4	)	$	18.8	$	(30.2	)	$	(0.15	)
Six-Months Ended June 30, 2020
Brokerage, as reported	$	658.6		$	157.0		$	501.6		$	2.2	$	499.4		$	2.58
Net gains on divestitures		(1.2	)		(0.2	)		(1.0	)		—		(1.0	)		—
Acquisition integration		13.4			3.2			10.2			—		10.2			0.05
Workforce and lease termination		21.5			5.0			16.5			—		16.5			0.09
Acquisition related adjustments		8.0			1.8			6.2			—		6.2			0.03
Levelized foreign currency translation		18.7			4.4			14.3			—		14.3			0.07
Brokerage, as adjusted	$	719.0		$	171.2		$	547.8		$	2.2	$	545.6		$	2.82
Risk Management, as reported	$	38.8		$	9.8		$	29.0		$	—	$	29.0		$	0.15
Workforce and lease termination		5.3			1.4			3.9			—		3.9			0.02
Acquisition related adjustments		1.2			0.3			0.9			—		0.9			—
Levelized foreign currency translation		0.5			0.2			0.3			—		0.3			—
Risk Management, as adjusted	$	45.8		$	11.7		$	34.1		$	—	$	34.1		$	0.17

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Termination of Agreement to Acquire Certain Willis Towers Watson plc Brokerage Operations

As we previously disclosed on July 26, 2021, our May 12, 2021 agreement to acquire certain Willis Towers Watson plc brokerage operations was terminated as a result of Aon plc and Willis Towers Watson plc terminating their combination.  In conjunction with the termination of this agreement, we exercised the special optional redemption feature of our $650 million tranche of 10-year senior notes issued on May 20, 2021.  These notes will be redeemed on August 13, 2021.  We continue to evaluate opportunities to deploy our excess cash position through our merger program as well as possible share repurchases, including the new repurchase program discussed below.

$1.5 Billion Share Repurchase Program

Effective July 29, 2021, our Board of Directors authorized the repurchase of up to $1.5 billion of common stock under a new share repurchase plan. This repurchase plan replaces our prior repurchase program, of which approximately $1.0 billion remained.

Repurchases of common stock may be effected from time to time through open market purchases, trading plans established in accordance with the U.S. Securities and Exchange Commission’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 the plan.  At our discretion, we may suspend the repurchase plan at any time.

Impact of COVID-19 Pandemic Recovery

Relative to second quarter 2020, during the second quarter 2021;

• Nearly all of our brokerage segment operations’ revenues benefited from our clients’ improving business conditions which increases insured exposure units (i.e., insured values, payrolls, employees, miles driven, gross receipts, etc.),

• Our risk management segment operations’ revenue benefited from our clients’ improving business conditions which increases new arising workers compensation claims,

• Our clean energy investments benefited from higher electricity production due to increased demand for electricity from improving business conditions.

If economic conditions continue to improve, we believe we may also see favorable revenue benefits in our brokerage and risk management segments and clean-energy investments in the third and fourth quarters of 2021 relative to same quarters in 2020.  However, if economic recovery slows, we could see the favorable revenue and investment returns soften from second quarter 2021 levels.

During the second, third and fourth quarters of 2020 and first quarter of 2021, we realized significant expense savings (totaling approximately $60 million to $75 million per quarter relative to prior year same quarters, adjusted for pro forma full-quarter costs related to acquisitions) as a result of reduced travel, entertainment and advertising expenses, reduced costs from lower employee medical plan utilization, a reduction in workforce, wage controls, and reduced use of external consultants.  During second quarter 2021, relative to second quarter 2020, as we increased our business activities, we saw modest increases in travel and entertainment, full restoration of advertising and more normalized usage of our employee medical plan, resumption of annual support-layer wage increases, increased use of external consultants, and a slight increase in incentive compensation.  These incremental costs totaled approximately $15 million in our brokerage segment relative to second quarter 2020.  We believe we will see incremental brokerage segment costs again in third and fourth quarter 2021, relative to same quarters in 2020, of approximately $20 million and $30 million, respectively.  However, if the pace of economic recovery accelerates we could see expense increases greater than estimates provided above.

For a discussion of risk and uncertainties relating to COVID‑19 for our business, results of operations and financial condition, see pages 2 and 3.

- 46 -

Results of Operations

Brokerage

The brokerage segment accounted for 73% of our revenues during the six-month period ended June 30, 2021. Our brokerage segment is primarily comprised of retail and wholesale brokerage operations.  Our brokerage segment generates revenues by:

(i) Identifying, negotiating and placing all forms of insurance or reinsurance coverage, as well as providing 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) 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.

(iii) 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 resource technology, communications and benefits administration.

(iv) 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

IRS and DOJ investigations - As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services business has been under investigation 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 has initiated audits for the 2012 tax year, and subsequent tax years, of over 100 of the micro-captive underwriting enterprises organized and/or managed by us.

In May 2020, we learned that the DOJ began conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not currently a target of the investigation. In June 2020 our subsidiary Artex Risk Solutions, Inc. (which we refer to as Artex) received a grand jury subpoena requesting documents relating to its micro-captive advisory business. We have produced documents in response to the subpoena.  We are fully cooperating with both the IRS investigation and the DOJ investigation. We are not able to reasonably estimate the amount of any potential loss in connection with these investigations.

Class action lawsuit - On December 7, 2018, a class action lawsuit was filed against us, Artex and other defendants, in the United States District Court for the District of Arizona.  The named plaintiffs were micro-captives and their related entities and owners who had IRC Section 831(b) tax benefits disallowed by the IRS.  The complaint alleged that the defendants defrauded the plaintiffs by marketing and managing micro-captives with the knowledge that the captives did not constitute bona fide insurance and thus would not qualify for tax benefits.  On August 5, 2019, the trial court granted the defendants’ motion to compel arbitration and dismissed the class action lawsuit.  Plaintiffs appealed this ruling to the United States Court of Appeals for the Ninth Circuit.  On September 9, 2020, the Ninth Circuit affirmed the ruling of the trial court dismissing the class action lawsuit.  On March 17, 2021, plaintiffs filed a petition for writ of certiorari with the United States Supreme Court.  On June 28, 2021, the United States Supreme Court denied the plaintiff’s petition for a writ of certiorari.  This ruling concluded the class action lawsuit in our favor.

- 47 -

Financial information relating to our brokerage segment results for the three and six-month periods ended June 30, 2021 as compared to the same periods in 2020, 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	2021			2020			Change			2021			2020			Change
Commissions	$	977.1		$	827.5		$	149.6		$	2,102.5		$	1,844.7		$	257.8
Fees		296.0			269.1			26.9			629.6			564.9			64.7
Supplemental revenues		55.2			50.3			4.9			122.0			109.3			12.7
Contingent revenues		43.3			37.4			5.9			106.6			82.5			24.1
Investment income		18.1			15.8			2.3			35.1			34.1			1.0
Net gains on divestitures		0.5			1.0			(0.5	)		4.6			1.2			3.4
Total revenues		1,390.2			1,201.1			189.1			3,000.4			2,636.7			363.7
Compensation		773.4			672.4			101.0			1,595.1			1,425.2			169.9
Operating		176.8			162.2			14.6			346.9			367.1			(20.2	)
Depreciation		21.1			17.8			3.3			43.2			35.4			7.8
Amortization		105.8			86.6			19.2			209.4			220.8			(11.4	)
Change in estimated acquisition    earnout payables		13.4			14.3			(0.9	)		25.8			(70.4	)		96.2
Total expenses		1,090.5			953.3			137.2			2,220.4			1,978.1			242.3
Earnings before income taxes		299.7			247.8			51.9			780.0			658.6			121.4
Provision for income taxes		72.1			57.6			14.5			188.0			157.0			31.0
Net earnings		227.6			190.2			37.4			592.0			501.6			90.4
Net earnings attributable to    noncontrolling interests		2.6			1.5			1.1			4.4			2.2			2.2
Net earnings attributable to    controlling interests	$	225.0		$	188.7		$	36.3		$	587.6		$	499.4		$	88.2
Diluted net earnings per share	$	1.09		$	0.97		$	0.12		$	2.90		$	2.58		$	0.32
Other Information
Change in diluted net earnings    per share		12	%		39	%					13	%		13	%
Growth in revenues		16	%		6	%					14	%		5	%
Organic change in commissions and    fees		7	%		1	%					6	%		3	%
Compensation expense ratio		56	%		56	%					53	%		54	%
Operating expense ratio		13	%		14	%					12	%		14	%
Effective income tax rate		24	%		23	%					24	%		24	%
Workforce at end of period (includes    acquisitions)											26,446			25,051
Identifiable assets at June 30										$	21,858.6		$	18,405.6
EBITDAC
Net earnings	$	227.6		$	190.2		$	37.4		$	592.0		$	501.6		$	90.4
Provision for income taxes		72.1			57.6			14.5			188.0			157.0			31.0
Depreciation		21.1			17.8			3.3			43.2			35.4			7.8
Amortization		105.8			86.6			19.2			209.4			220.8			(11.4	)
Change in estimated acquisition    earnout payables		13.4			14.3			(0.9	)		25.8			(70.4	)		96.2
EBITDAC	$	440.0		$	366.5		$	73.5		$	1,058.4		$	844.4		$	214.0

- 48 -

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, 2021 compared to the same periods in 2020 (in millions):

	Three-month period ended June 30,									Six-month period ended June 30,
	2021			2020			Change			2021			2020			Change
Net earnings, as reported	$	227.6		$	190.2			20	%	$	592.0		$	501.6			18	%
Provision for income taxes		72.1			57.6						188.0			157.0
Depreciation		21.1			17.8						43.2			35.4
Amortization		105.8			86.6						209.4			220.8
Change in estimated acquisition    earnout payables		13.4			14.3						25.8			(70.4	)
EBITDAC		440.0			366.5			20	%		1,058.4			844.4			25	%
Net gains on divestitures		(0.5	)		(1.0	)					(4.6	)		(1.2	)
Acquisition integration		6.2			6.7						10.3			13.4
Acquisition related adjustments		7.7			4.1						13.8			8.7
Workforce and lease termination    related charges		4.1			15.0						9.3			21.5
Levelized foreign currency translation		—			17.5						—			29.3
EBITDAC, as adjusted	$	457.5		$	408.8			12	%	$	1,087.2		$	916.1			19	%
Net earnings margin, as reported		16.4	%		15.8	%	+ 54 bpts				19.7	%		19.0	%	+ 71 bpts
EBITDAC margin, as adjusted		32.9	%		32.7	%	+ 23 bpts				36.3	%		33.6	%	+ 267 bpts
Reported revenues	$	1,390.2		$	1,201.1					$	3,000.4		$	2,636.7
Adjusted revenues - see pages    42 and 43	$	1,389.7		$	1,250.6					$	2,995.8		$	2,725.1

Commissions and fees - The aggregate increase in base commissions and fees for the three-month period ended June 30, 2021, compared to the same period in 2020, was due to revenues associated with acquisitions that were made in the twelve-month period ended June 30, 2021 ($57.1 million), and to the organic change in base commissions and fee revenues.  The organic change in base commissions and fee revenues was 6.9% and 1.2% for the three-month periods ended June 30, 2021 and 2020, respectively.

The aggregate increase in base commissions and fees for the six-month period ended June 30, 2021, compared to the same period in 2020, was due to revenues associated with acquisitions that were made in the twelve-month period ended June 30, 2021 ($107.3 million), and to the organic change in base commissions and fee revenues.  The organic change in base commissions and fee revenues was 5.8% and 2.6% for the six-month periods ended June 30, 2021 and 2020, respectively.

In our property/casualty brokerage operations, during three-month period ended June 30, 2021 we saw continued strong customer retention and new business generation, improving renewal exposure units (i.e., insured values, payrolls, employees, miles driven, gross receipts, etc.), and continued increases in premium rates across most geographies and lines of coverage.  In our employee benefits brokerage operations, during the three-month period ended June 30, 2021, we saw improvement in covered lives on renewal business compared to first quarter 2021, yet still lower than pre-pandemic levels, and new consulting and special project work was also lower than pre-pandemic levels.  We believe these favorable trends should continue for the remainder of 2021; however, if the economic recovery slows or reverses course, we could see our revenue growth soften from first half levels. 

- 49 -

Items excluded from organic revenue computations yet impacting revenue comparisons for the three and six-month periods ended June 30, 2021 include the following (in millions):

	Three-Month Period Ended June 30,									Six-Month Period Ended June 30,
Organic Revenues (Non-GAAP)	2021			2020			Change			2021			2020			Change
Base Commissions and Fees
Commission and fees, as reported	$	1,273.1		$	1,096.6			16.1	%	$	2,732.1		$	2,409.6			13.4	%
Less commission and fee revenues from acquisitions		(57.1	)		—						(107.3	)		—
Less divested operations		—			(4.3	)					—			(7.4	)
Levelized foreign currency translation		—			45.4						—			79.0
Organic base commission and fees	$	1,216.0		$	1,137.7			6.9	%	$	2,624.8		$	2,481.2			5.8	%
Supplemental revenues
Supplemental revenues, as reported	$	55.2		$	50.3			9.7	%	$	122.0		$	109.3			11.6	%
Less supplemental revenues from acquisitions		(1.3	)		—						(2.4	)		—
Levelized foreign currency translation		—			2.4						—			4.1
Organic supplemental revenues	$	53.9		$	52.7			2.3	%	$	119.6		$	113.4			5.5	%
Contingent revenues
Contingent revenues, as reported	$	43.3		$	37.4			15.8	%	$	106.6		$	82.5			29.2	%
Less contingent revenues from acquisitions		(1.1	)		—						(2.0	)		—
Levelized foreign currency translation		—			0.4						—			1.4
Organic contingent revenues	$	42.2		$	37.8			11.6	%	$	104.6		$	83.9			24.7	%
Total reported commissions, fees, supplemental    revenues and contingent revenues	$	1,371.6		$	1,184.3			15.8	%	$	2,960.7		$	2,601.4			13.8	%
Less commissions, fees, supplemental revenues and    contingent revenues from acquisitions		(59.5	)		—						(111.7	)		—
Less divested operations		—			(4.3	)					—			(7.4	)
Levelized foreign currency translation		—			48.2						—			84.5
Total organic commissions, fees, supplemental    revenues and contingent revenues	$	1,312.1		$	1,228.2			6.8	%	$	2,849.0		$	2,678.5			6.4	%

The following is a summary of brokerage segment acquisition activity for 2021 and 2020:  

	Three-month period ended June 30,				Six-month period ended June 30,
	2021		2020		2021		2020
Number of acquisitions closed		7		4		12		12
Estimated annualized revenues acquired (in millions)	$	34.1	$	13.9	$	123.8	$	138.1

We issued 92,000 shares and 370,000 shares of our common stock at the request of sellers and/or in connection with tax-free exchange acquisitions in the three-month periods ended June 30, 2021 and 2020, respectively.  We issued 566,000 shares and 974,000 shares of our common stock at the request of sellers and/or in connection with tax-free exchange acquisitions made in the six-month periods ended June 30, 2021 and 2020, respectively.

On May 12, 2021, we signed an agreement to acquire certain Willis Towers Watson plc reinsurance, specialty and retail brokerage operations as part of a proposed regulatory remedy for the pending Aon plc and Willis Towers plc combination for net cash consideration of approximately $3.57 billion.  On July 26, 2021, we announced that this agreement had been terminated in conjunction with the announced termination of the Aon plc and Willis Towers Watson plc combination. 

On May 17, 2021, we closed on a follow-on public offering of our common stock whereby 10.3 million shares of our stock were issued for net proceeds, after underwriting discounts and other expenses related to this offering, of $1,437.9 million.  Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of the offering to fund this acquisition.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as other general corporate purposes.

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On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as 2031 Notes) and the $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 Notes).  The weighted average interest rate is 3.31% per annum after giving effect to underwriting costs and the net hedge loss.  Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of this offering to fund this transaction.  In conjunction with the termination of this agreement, on July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes (which is described in further detail in Note 7 to our consolidated financial statements).  These notes will be redeemed on August 13, 2021.

Supplemental and contingent revenues - Reported supplemental and contingent revenues recognized in 2021, 2020 and 2019 by quarter are as follows (in millions):

	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		YTD
2021
Reported supplemental revenues	$	66.8	$	55.2					$	122.0
Reported contingent revenues		63.3		43.3						106.6
Reported supplemental and contingent revenues	$	130.1	$	98.5					$	228.6
2020
Reported supplemental revenues	$	59.0	$	50.3	$	54.7	$	57.9	$	221.9
Reported contingent revenues		45.1		37.4		34.5		30.0		147.0
Reported supplemental and contingent revenues	$	104.1	$	87.7	$	89.2	$	87.9	$	368.9
2019
Reported supplemental revenues	$	56.7	$	46.9	$	49.8	$	57.1	$	210.5
Reported contingent revenues		48.0		29.5		30.4		27.7		135.6
Reported supplemental and contingent revenues	$	104.7	$	76.4	$	80.2	$	84.8	$	346.1

Investment income and net gains on divestitures - This primarily represents (1) interest income earned on cash, cash equivalents and restricted funds and interest income from premium financing and (2) net gains related to divestitures and sales of books of business, which were $0.5 million and $1.0 million for the three-month periods ended June 30, 2021 and 2020, respectively and $4.6 million and $1.2 million for six-months periods ended June 30, 2021 and 2020, respectively. Investment income in the three and six-month periods ended June 30, 2021 and 2020 increased compared to the same periods in 2020, primarily due to increases in interest income earned from increases on client held funds.  

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, 2021 with the same periods in 2020 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Compensation expense, as reported	$	773.4		$	672.4		$	1,595.1		$	1,425.2
Acquisition integration		(3.6	)		(3.8	)		(7.2	)		(7.6	)
Workforce and lease termination related charges		(2.8	)		(13.3	)		(7.3	)		(18.9	)
Acquisition related adjustments		(7.7	)		(4.1	)		(13.8	)		(8.7	)
Levelized foreign currency translation		—			28.4			—			48.1
Compensation expense, as adjusted	$	759.3		$	679.6		$	1,566.8		$	1,438.1
Reported compensation expense ratios		55.6	%		56.0	%		53.2	%		54.1	%
Adjusted compensation expense ratios		54.6	%		54.3	%		52.3	%		52.8	%
Reported revenues	$	1,390.2		$	1,201.1		$	3,000.4		$	2,636.7
Adjusted revenues - see pages 42 and 43	$	1,389.7		$	1,250.6		$	2,995.8		$	2,725.1

The $101.0 million increase in compensation expense for the three-month period ended June 30, 2021, compared to the same period in 2020, was primarily due to compensation associated with the acquisitions completed in the twelve month period ended June 30, 2021‑ $14.8 million, producer compensation and other incentive compensation linked to operating results - $86.2 million in the aggregate.

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The $169.9 million increase in compensation expense for the six-month period ended June 30, 2021, compared to the same period in 2020, was primarily due to compensation associated with the acquisitions completed in the twelve month period ended June 30, 2021 ‑ $23.3 million, producer compensation and other incentive compensation linked to operating results - $149.2 million in the aggregate, partially offset by a decrease in temporary-staffing expense - $2.6 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, 2021 with the same periods in 2020 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Operating expense, as reported	$	176.8		$	162.2		$	346.9		$	367.1
Acquisition integration		(2.6	)		(2.9	)		(3.1	)		(5.8	)
Workforce and lease termination related charges		(1.3	)		(1.7	)		(2.0	)		(2.6	)
Levelized foreign currency translation		—			4.6			—			12.2
Operating expense, as adjusted	$	172.9		$	162.2		$	341.8		$	370.9
Reported operating expense ratios		12.7	%		13.5	%		11.6	%		13.9	%
Adjusted operating expense ratios		12.4	%		13.0	%		11.4	%		13.6	%
Reported revenues	$	1,390.2		$	1,201.1		$	3,000.4		$	2,636.7
Adjusted revenues - see pages 42 and 43	$	1,389.7		$	1,250.6		$	2,995.8		$	2,725.1

The $14.6 million increase in operating expense for the three-month period ended June 30, 2021 compared to the same period in 2020, was primarily due to increases in meeting and client entertainment expense and professional and banking fees ‑ $8.0 million in the aggregate, expenses associated with the acquisitions completed in the twelve month period ended June 30, 2021 - $5.1 million and an increase in technology expenses - $9.1 million, offset by a decrease in business insurance - $7.6 million.  During second quarter 2021, relative to second quarter 2020, as we increased our business activities, we saw modest increases in travel and entertainment, full restoration of advertising and more normalized usage of our employee medical plan, resumption of annual support-layer wage increases and increased use of external consultants.

The $20.2 million decrease in operating expense for the six-month period ended June 30, 2021 compared to the same period in 2020, was primarily due to savings in meeting and client entertainment expense and decreases in bad debt expense ‑ $37.5 million in the aggregate and business insurance - $4.8 million, partially offset by expenses associated with the acquisitions completed in the twelve month period ended June 30, 2021 - $8.8 million and an increase in technology expenses - $13.3 million.

Depreciation - Depreciation expense increased in the three and six-month periods ended June 30, 2021 compared to the same periods in 2020 by $2.3 million and $7.8 million, respectively.  The increase in depreciation expense in 2021 compared to 2020 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 expenses associated with acquisitions completed in the twelve-month period ended June 30, 2021.

Amortization - The increase in amortization expense in the three-month period ended June 30, 2021 compared to the same period in 2020 was primarily due to write-off of amortizable intangible assets and amortization expense of intangible assets associated with acquisitions completed in the three-month period ended June 30, 2021. The decrease in amortization expense in the six-month period ended June 30, 2021 compared to the same period in 2020 was primarily due to write-off of amortizable intangible assets in the six‑month period ended June 30, 2020. Based on the results of impairment reviews during the three and six-month periods ended June 30, 2021, we wrote off $8.0 million and $13.1 million, respectively, of amortizable assets.  Based on the results of impairment reviews during the six-month period ended June 30, 2020, we wrote off $45.8 million 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.  In consideration of the potential impacts of COVID-19 on our reporting units, we performed a qualitative impairment review on carrying value of our goodwill for all of our reporting units as of June 30, 2021 and no indicators of impairment were noted.

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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, 2021, compared to the same periods in 2020, was primarily due to adjustments made to the estimated fair value of earnout obligations related to revised projections of future performance.  During the three-month periods ended June 30, 2021 and 2020, we recognized $8.9 million and $7.6 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 2017 to 2021. During the six-month periods ended June 30, 2021 and 2020, we recognized $17.7 million and $18.2 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 2017 to 2021. In addition, during the three-month periods ended June 30, 2021 and 2020, we recognized $4.5 million and $6.7 million of expense, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised projections of future performance for 25 and 41 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2021 and 2020, we recognized $8.1 million of expense and $88.5 million of income, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised projections of future performance for 45 and 98 acquisitions, respectively.     

The amounts initially recorded as earnout payables for our 2017 to 2021 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, 2021 and 2020, were 24.1% and 23.2%, respectively. The brokerage segment’s effective income tax rates for the six-month periods ended June 30, 2021 and 2020, were 24.1% and 23.8%, respectively.  We anticipate reporting an effective tax rate of approximately 23.0% to 25.0% in our brokerage segment for the foreseeable future.  

Net earnings attributable to noncontrolling interests - The amounts reported in this line for the three-month periods ended June 30, 2021 and 2020, include noncontrolling interest earnings of $2.6 million and $1.5 million, respectively, and for the six-month periods ended June 30, 2021 and 2020, $4.4 million and $2.2 million, respectively.

Risk Management

The risk management segment accounted for 13% of our revenue during the six-month period ended June 30, 2021.  Our risk management segment operations provide contract claim settlement, claim administration, loss control services and risk management consulting for commercial, not for profit, captive and public 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.

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Financial information relating to our risk management segment results for the three and six-month periods ended June 30, 2021 as compared to the same periods in 2020, 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,
	2021			2020			Change			2021			2020			Change
Fees	$	244.9		$	190.6		$	54.3		$	465.1		$	402.1		$	63.0
Investment income		—			0.2			(0.2	)		0.1			0.5			(0.4	)
Net gains on divestitures		0.1			—			0.1			0.1			—			0.1
Revenues before reimbursements		245.0			190.8			54.2			465.3			402.6			62.7
Reimbursements		36.7			32.4			4.3			69.1			70.1			(1.0	)
Total revenues		281.7			223.2			58.5			534.4			472.7			61.7
Compensation		145.9			126.1			19.8			280.0			257.0			23.0
Operating		51.5			36.2			15.3			97.9			82.1			15.8
Reimbursements		36.7			32.4			4.3			69.1			70.1			(1.0	)
Depreciation		11.6			12.3			(0.7	)		23.1			24.6			(1.5	)
Amortization		2.2			1.6			0.6			3.8			3.0			0.8
Change in estimated acquisition    earnout payables		0.4			1.4			(1.0	)		3.0			(2.9	)		5.9
Total expenses		248.3			210.0			38.3			476.9			433.9			43.0
Earnings before income taxes		33.4			13.2			20.2			57.5			38.8			18.7
Provision for income taxes		8.5			3.3			5.2			14.6			9.8			4.8
Net earnings		24.9			9.9			15.0			42.9			29.0			13.9
Net earnings attributable to    noncontrolling interests		—			—			—			—			—			—
Net earnings attributable to    controlling interests	$	24.9		$	9.9		$	15.0		$	42.9		$	29.0		$	13.9
Diluted net earnings per share	$	0.12		$	0.05		$	0.06		$	0.21		$	0.15		$	—
Other information
Change in diluted net earnings per share		140	%		-38	%					41	%		-12	%
Growth in revenues (before    reimbursements)		28	%		-9	%					16	%		-2	%
Organic change in fees (before    reimbursements)		20	%		-10	%					10	%		-3	%
Compensation expense ratio (before    reimbursements)		60	%		66	%					60	%		64	%
Operating expense ratio (before    reimbursements)		21	%		19	%					21	%		20	%
Effective income tax rate		25	%		25	%					25	%		25	%
Workforce at end of period (includes    acquisitions)											6,960			6,438
Identifiable assets at June 30										$	1,058.5		$	929.1
EBITDAC
Net earnings	$	24.9		$	9.9		$	15.0		$	42.9		$	29.0		$	13.9
Provision for income taxes		8.5			3.3			5.2			14.6			9.8			4.8
Depreciation		11.6			12.3			(0.7	)		23.1			24.6			(1.5	)
Amortization		2.2			1.6			0.6			3.8			3.0			0.8
Change in estimated acquisition    earnout payables		0.4			1.4			(1.0	)		3.0			(2.9	)		5.9
EBITDAC	$	47.6		$	28.5		$	19.1		$	87.4		$	63.5		$	23.9

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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, 2021 to the same periods in 2020 (in millions):

	Three-month period ended June 30,									Six-month period ended June 30,
	2021			2020			Change			2021			2020			Change
Net earnings, as reported	$	24.9		$	9.9			152	%	$	42.9		$	29.0			48	%
Provision for income taxes		8.5			3.3						14.6			9.8
Depreciation		11.6			12.3						23.1			24.6
Amortization		2.2			1.6						3.8			3.0
Change in estimated acquisition    earnout payables		0.4			1.4						3.0			(2.9	)
Total EBITDAC		47.6			28.5			67	%		87.4			63.5			37.6	%
Net gains on divestitures		(0.1	)		—						(0.1	)		—
Workforce and lease termination    related charges		0.6			5.0						1.3			5.3
Acquisition related adjustments		0.2									0.2
Levelized foreign currency translation		—			0.7						—			1.6
EBITDAC, as adjusted	$	48.3		$	34.2			41	%	$	88.8		$	70.4			26	%
Net earnings margin (before    reimbursements), as reported		10.2	%		5.2	%	+ 510 bpts				9.2	%		7.2	%	+ 221 bpts
EBITDAC margin (before    reimbursements), as adjusted		19.7	%		17.5	%	+ 220 bpts				19.1	%		17.0	%	+ 205 bpts
Reported revenues (before    reimbursements)	$	245.0		$	190.8					$	465.3		$	402.6
Adjusted revenues (before    reimbursements) - see pages 42 and 43	$	244.9		$	195.2					$	465.2		$	413.3

Fees - In our risk management operations, for the three-month period ended June 30, 2021, new core workers compensation claims arising improved from first quarter 2021 due to our clients improving business conditions and are well above second quarter 2020 pandemic lows.  This improvement was somewhat offset by lower new COVID-related workers compensation claims arising relative to second quarter 2020 and first quarter 2021 levels.  We believe these favorable trends should continue for the remainder of 2021; however, a slower recovery or reversal in the number of workers employed could cause fewer new core workers compensation claims to arise in future quarters.  Organic change in fee revenues for the three-month period ended June 30, 2021 was 19.6% compared to ‑9.6% for the same period in 2020.  Organic change in fee revenues for the six-month period ended June 30, 2021 was 9.6% compared to -2.8% for the same period in 2020.  

Items excluded from organic fee computations yet impacting revenue comparisons for the three and six-month periods ended June 30, 2021 and 2020 include the following (in millions):

	Three-Month Period Ended June 30								Six-Month Period Ended June 30
Organic Revenues (Non-GAAP)	2021			2020		Change			2021			2020		Change
Fees	$	240.0		$	189.5		26.6	%	$	457.3		$	399.7		14.4	%
International performance bonus fees		4.9			1.1					7.8			2.4
Fees as reported		244.9			190.6		28.5	%		465.1			402.1		15.7	%
Less fees from acquisitions		(11.6	)		—					(12.7	)		—
Levelized foreign currency translation		—			4.4					—			10.7
Organic fees	$	233.3		$	195.0		19.6	%	$	452.4		$	412.8		9.6	%

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.  

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Investment income - Investment income primarily represents interest income earned on our cash and cash equivalents.  Investment income in the three and six-month periods ended June 30, 2021 decreased compared to the same periods in 2020 primarily due to decreases in interest income from our U.S. operations due to decreases in interest rates earned on our funds.  

The following is a summary of risk management segment acquisition activity for 2021 and 2020:  

	Three-month period ended June 30,				Six-month period ended June 30,
	2021		2020		2021		2020
Number of acquisitions closed		1		—		2		—
Estimated annualized revenues acquired (in millions)	$	36.0	$	—	$	50.0	$	—

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, 2021 with the same periods in 2020 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Compensation expense, as reported	$	145.9		$	126.1		$	280.0		$	257.0
Workforce and lease termination related charges		(0.4	)		(4.9	)		(0.8	)		(5.2	)
Acquisition related adjustments		(0.2	)		—			(0.2	)		—
Levelized foreign currency translation		—			3.1			—			7.5
Compensation expense, as adjusted	$	145.3		$	124.3		$	279.0		$	259.3
Reported compensation expense ratios (before    reimbursements)		59.6	%		66.1	%		60.2	%		63.8	%
Adjusted compensation expense ratios (before    reimbursements)		59.3	%		63.7	%		60.0	%		62.7	%
Reported revenues (before reimbursements)	$	245.0		$	190.8		$	465.3		$	402.6
Adjusted revenues (before reimbursements) -    see pages 42 and 43	$	244.9		$	195.2		$	465.2		$	413.3

The $19.8 million increase in compensation expense for the three-month period ended June 30, 2021 compared to the same period in 2020, was primarily due other incentive compensation linked to operating results and deferred compensation - $9.9 million in the aggregate, compensation associated with the acquisitions completed in the twelve month period ended June 30, 2021 - $7.9 million and an increase in temporary-staffing expense - $2.0 million.

The $23.0 million increase in compensation expense for the six-month period ended June 30, 2021 compared to the same period in 2020, was primarily due other incentive compensation linked to operating results and deferred compensation - $12.7 million in the aggregate, compensation associated with the acquisitions completed in the twelve month period ended June 30, 2021 - $8.5 million and an increase in temporary-staffing expense - $1.8 million.  

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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, 2021 with the same periods in 2020 (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Operating expense, as reported	$	51.5		$	36.2		$	97.9		$	82.1
Workforce and lease termination related charges		(0.2	)		(0.1	)		(0.5	)		(0.1	)
Levelized foreign currency translation		—			0.6			—			1.6
Operating expense, as adjusted	$	51.3		$	36.7		$	97.4		$	83.6
Reported operating expense ratios (before    reimbursements)		21.0	%		19.0	%		21.0	%		20.4	%
Adjusted operating expense ratios (before    reimbursements)		21.0	%		18.8	%		20.9	%		20.2	%
Reported revenues (before reimbursements)	$	245.0		$	190.8		$	465.3		$	402.6
Adjusted revenues (before reimbursements) -    see pages 42 and 43	$	244.9		$	195.2		$	465.2		$	413.3

The $15.3 million increase in operating expense for the three-month period ended June 30, 2021 compared to the same period in 2020, was primarily due to increases in professional fees - $7.0 million, technology expense - $1.8 million, business insurance - $2.6 million and expenses associated with the acquisitions completed in the twelve month period ended June 30, 2021 - $2.0 million.

The $15.8 million increase in operating expense for the six-month period ended June 30, 2021 compared to the same period in 2020, was primarily due to increases in professional fees - $9.1 million, technology expense - $3.2 million, business insurance - $3.9 million and expenses associated with the acquisitions completed in the twelve month period ended June 30, 2021- $2.2 million.

Depreciation - Depreciation expense decreased in the three and six-month periods ended June 30, 2021 compared to the same periods in 2020 by $0.7 million and $1.5 million, respectively.  This decrease reflects the impact of furniture, equipment and leasehold improvements becoming fully depreciated in 2020 and leasehold improvements being written off in 2020 related to the termination of real estate leases and abandonment of leased spaces.

Amortization - The increase in amortization expense in the three and six-month periods ended June 30, 2021 compared to the same periods in 2020 was primarily due to amortization expense of intangible assets associated with acquisitions completed in the twelve-month period ended June 30, 2021.  

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, 2021 compared to the same periods in 2020, was primarily due to adjustments made to the estimated fair value of earnout obligations related to revised projections of future performance.  During the three-month periods ended June 30, 2021 and 2020, we recognized $0.3 million and $0.1 million, respectively, 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, 2021 and 2020, we recognized $0.5 million and $0.3 million, respectively, of expense in each period 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, 2021 and 2020, we recognized $0.1 million and $1.3 million of expense, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised projections of future performance for one and three acquisitions, respectively. In addition, during the six-month periods ended June 30, 2021 and 2020, we recognized $2.5 million of expense and $3.1 million of income, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised projections of future performance for three and four acquisitions, respectively.

Provision for income taxes - The risk management segment’s effective income tax rates for the three-month periods ended June 30, 2021 and 2020, were 25.4% and 25.0%, respectively. The risk management segment’s effective income tax rates for the six-month periods ended June 30, 2021 and 2020, were 25.3%.  We anticipate reporting an effective tax rate on adjusted results of approximately 24.0% to 26.0% in our risk management segment for the foreseeable future.

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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 translation.  For a detailed discussion of the nature of these investments, see Note 12 to our consolidated financial statements included herein for a summary of our investments as of June 30, 2021 and in Note 14 to our most recent Annual Report on Form 10‑K as of December 31, 2020.  For a detailed discussion of the nature of our debt, see Note 7 to our consolidated financial statements included herein as of June 30, 2021 and in Note 8 to our most recent Annual Report on Form 10‑K as of December 31, 2020.

Financial information relating to our corporate segment results for the three and six-month periods ended June 30, 2021 compared to the same periods in 2020 is as follows (in millions, except per share and percentages):

	Three-month period ended June 30,									Six-month period ended June 30,
Statement of Earnings	2021			2020			Change			2021			2020			Change
Revenues from consolidated clean coal    production plants	$	245.3		$	146.7		$	98.6		$	528.4		$	314.6		$	213.8
Royalty income from clean coal licenses		16.4			13.0			3.4			34.3			26.9			7.4
Loss from unconsolidated clean coal    production plants		(0.7	)		(0.2	)		(0.5	)		(1.1	)		(0.2	)		(0.9	)
Other net revenues		0.6			0.2			0.4			2.1			0.2			1.9
Total revenues		261.6			159.7			101.9			563.7			341.5			222.2
Cost of revenues from consolidated clean    coal production plants		268.8			161.2			107.6			577.9			346.6			231.3
Compensation		17.8			17.1			0.7			37.6			29.6			8.0
Operating		25.1			16.4			8.7			41.7			23.3			18.4
Interest		56.2			50.0			6.2			104.3			100.5			3.8
Depreciation		4.5			4.3			0.2			9.0			11.2			(2.2	)
Total expenses		372.4			249.0			123.4			770.5			511.2			259.3
Loss before income taxes		(110.8	)		(89.3	)		(21.5	)		(206.8	)		(169.7	)		(37.1	)
Benefit for income taxes		(60.1	)		(51.0	)		(9.1	)		(167.4	)		(156.3	)		(11.1	)
Net loss		(50.7	)		(38.3	)		(12.4	)		(39.4	)		(13.4	)		(26.0	)
Net earnings attributable to    noncontrolling interests		9.0			6.6			2.4			18.8			15.0			3.8
Net loss attributable to    controlling interests	$	(59.7	)	$	(44.9	)	$	(14.8	)	$	(58.2	)	$	(28.4	)	$	(29.8	)
Diluted net loss per share	$	(0.29	)	$	(0.23	)	$	(0.06	)	$	(0.28	)	$	(0.15	)	$	(0.13	)
Identifiable assets at June 30										$	4,900.1		$	1,971.5
EBITDAC
Net loss	$	(50.7	)	$	(38.3	)	$	(12.4	)	$	(39.4	)	$	(13.4	)	$	(26.0	)
Benefit for income taxes		(60.1	)		(51.0	)		(9.1	)		(167.4	)		(156.3	)		(11.1	)
Interest		56.2			50.0			6.2			104.3			100.5			3.8
Depreciation		4.5			4.3			0.2			9.0			11.2			(2.2	)
EBITDAC	$	(50.1	)	$	(35.0	)	$	(15.1	)	$	(93.5	)	$	(58.0	)	$	(35.5	)

Revenues - Revenues in the corporate segment consist of the following:

• Revenues from consolidated clean coal production plants represents revenues from the consolidated IRC Section 45 facilities in which we have a majority ownership position and maintain control over the operations at the related facilities.  

• The increase in revenue from consolidated clean coal production plants for the three and six-month periods ended June 30, 2021 compared to the same periods in 2020, was due primarily to increased production of refined coal related to higher electricity production as a result of increased demand for electricity as businesses open up, hotter temperatures, less energy produced from wind, rising natural gas prices and more plants within our portfolio being operational during the period.

• Royalty income from clean coal licenses represents revenues related to Chem-Mod LLC.  As of June 30, 2021, we held a 46.5% controlling interest in Chem-Mod LLC. As Chem-Mod LLC’s manager, we are required to consolidate its operations.  

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• The increase in royalty income in the three and six-month periods ended June 30, 2021 compared to the same periods in 2020, was due to increased production of refined coal by Chem-Mod LLC’s licensees due to increased demand for electricity as businesses open up and rising natural gas prices.  

Loss from unconsolidated clean coal production plants represents our equity portion of the pretax operating results from the unconsolidated IRC Section 45 facilities.  The production of the refined coal generates pretax operating losses.

The low level of losses in the three and six-month periods ended June 30, 2021 and 2020 is due to the vast majority of our operations being consolidated.  

Cost of revenues - Cost of revenues from consolidated clean coal production plants consists of the cost of coal, labor, equipment maintenance, chemicals, supplies, management fees and depreciation incurred by the clean coal production plants to generate the consolidated revenues discussed above.  The increase in the three and six-month periods ended June 30, 2021, compared to the same periods in 2020, was primarily due to increased production of refined coal.

Compensation expense - Compensation expense in the three-month periods ended June 30, 2021 and 2020, includes salary, incentive compensation, and associated benefit expenses of $17.8 million and $17.1 million, respectively. The change in compensation expense for the three-month period ended June 30, 2021 compared to the same period in 2020 was primarily due to higher incentive compensation recognized in 2021 compared to 2020 related to higher electricity production.

Compensation expense in the six-month periods ended June 30, 2021 and 2020, includes salary, incentive compensation, and associated benefit expenses of $37.6 million and $29.6 million, respectively.  The change in compensation expense for the six-month period ended June 30, 2021 compared to the same period in 2020 was primarily due to higher incentive compensation recognized in 2021 compared to 2020 related to higher electricity production.

Operating expense - Operating expense in the three-month period ended June 30, 2021 includes banking and related fees of $1.0 million, external professional fees and other due diligence costs related to acquisitions of $11.7 million, which includes $10.2 million of transaction-related costs as described on page 61 in note (2), other corporate and clean energy related expenses, including legal fees, and costs related to corporate data and branding initiatives, of $11.3 million, and a net unrealized foreign exchange remeasurement loss of $1.1 million.

Operating expense in the six-month period ended June 30, 2021 includes banking and related fees of $2.1 million, external professional fees and other due diligence costs related to acquisitions of $14.7 million, which includes $10.2 million of transaction‑related costs as described on page 61 in note (2), other corporate and clean energy related expenses, including legal fees, and costs related to corporate data and branding initiatives, of $19.7 million, and a net unrealized foreign exchange remeasurement loss of $5.2 million.

Operating expense in the three-month period ended June 30, 2020 includes banking and related fees of $1.5 million, external professional fees and other due diligence costs related to acquisitions of $1.3 million, other corporate and clean energy related expenses, including legal fees, and costs related to corporate data and branding initiatives, of $8.5 million, and a net unrealized foreign exchange remeasurement loss of $5.1 million.

Operating expense in the six-month period ended June 30, 2020 includes banking and related fees of $2.8 million, external professional fees and other due diligence costs related to acquisitions of $3.9 million, other corporate and clean energy related expenses, including legal fees, and costs related to corporate data and branding initiatives, of $23.9 million, and a net unrealized foreign exchange remeasurement gain of $7.3 million.

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Interest expense - The increase in interest expense for the three and six-month periods ended June 30, 2021, compared to the same periods in 2020, was due to the following:

Change in interest expense related to:	Three-month period ended June 30, 2021			Six-month period ended June 30, 2021
Interest on borrowings from our Credit Agreement	$	(0.3	)	$	(3.3	)
Interest on the maturity of the Series C notes		(1.0	)		(1.5	)
Interest on the maturity of the Series K and L notes		(1.0	)		(1.9	)
Interest on the $348.0 million notes funded on August 2 and 4, 2017		(0.4	)		(0.8	)
Interest on the $500.0 million notes funded on June 13, 2018		(0.1	)		(0.3	)
Interest on the $575.0 million notes funded on January 30, 2020		—			1.8
Interest on the $100.0 million notes funded on February 10, 2020		0.7			1.0
Interest on the $75.0 million notes funded on May 5, 2021		0.6			0.6
Interest on the $1,500.0 million senior notes funded on May 20, 2021		5.4			5.4
Amortization of hedge gains/losses		2.3			2.8
Net change in interest expense	$	6.2		$	3.8

Depreciation - Depreciation expense in the three-month periods ended June 30, 2021 increased compared to the same period in 2020 and in the six-month period ended June 30, 2021 decreased compared to the same period in 2020 due to the write-off of one of the 2011 Era plants in 2020.

Benefit for income taxes - We allocate the provision for income taxes to the brokerage and risk management segments using local country statutory rates.  As a result, the provision for income taxes for the corporate segment reflects the entire benefit to us of the IRC Section 45 tax credits generated, because that is the segment which produced the credits. The law that provides for IRC Section 45 tax credits expired in December 2019 for our fourteen 2009 Era Plants and is scheduled to expire in December 2021 for our twenty-one 2011 Era Plants.  Our consolidated effective tax rate for the three-month period ended June 30, 2021 was 9.2% compared to 5.8% for the same period in 2020.  Our consolidated effective tax rate for the six-month period ended June 30, 2021 was 5.6% compared to 2.0% for the same period in 2020. The tax rates for the three and six-month periods ended June 30, 2021 and 2020 were lower than the statutory rate primarily due to the production of IRC Section 45 clean energy tax credits recognized during the periods.  There were $97.0 million and $92.7 million of Section 45 tax credits recognized in the six-month periods ended June 30, 2021 and 2020, respectively.  There were $101.8 million and $58.9 million of tax credits produced in the six-month periods ended June 30, 2021 and 2020, respectively.  In third quarter 2020, our U.K. effective income tax rate increased from 17.5% to 19.0% and we incurred one-time taxes associated with realignment of our operations to continue to conduct certain business in the European Union after Brexit.  In second quarter 2021, the U.K. government enacted tax legislation that increases the corporate tax rate from 19.0% to 25.0% effective in 2023.  We incurred additional income tax expense in the quarter to adjust certain deferred income tax liabilities to the higher income tax rate.

Net earnings attributable to noncontrolling interests - The amounts reported in this line for the three-month periods ended June 30, 2021 and 2020 include non-controlling interest earnings of $9.2 million and $6.7 million, respectively, related to our investment in Chem-Mod LLC.  The amounts reported in this line for the six-month periods ended June 30, 2021 and 2020 include non-controlling interest earnings of $19.3 million and $14.0 million, respectively, related to our investment in Chem-Mod LLC.  As of June 30, 2021 and 2020, 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, 2021 and 2020 for the corporate segment (in millions):

	2021									2020
							Net Earnings								Net Earnings
							(Loss)								(Loss)
				Income			Attributable to						Income		Attributable to
	Pretax			Tax			Controlling			Pretax			Tax		Controlling
Three-Month Periods Ended June 30,	Loss			Benefit			Interests			Loss			Benefit		Interests
Interest and banking costs	$	(57.2	)	$	14.3		$	(42.9	)	$	(51.5	)	$	12.9	$	(38.6	)
Clean energy related (1)		(27.9	)		48.7			20.8			(22.9	)		27.9		5.0
Acquisition costs (2)		(11.8	)		1.6			(10.2	)		(1.4	)		0.2		(1.2	)
Corporate (3) (4)		(22.9	)		(4.5	)		(27.4	)		(20.1	)		10.0		(10.1	)
Corporate, as reported		(119.8	)		60.1			(59.7	)		(95.9	)		51.0		(44.9	)
Adjustments
Transaction-related costs (2)		10.2			(1.5	)		8.7			—			—		—
U.K.-related tax rate change (3)		—			19.3			19.3			—			—		—
Components of Corporate    Segment, as adjusted
Interest and banking costs		(57.2	)		14.3			(42.9	)		(51.5	)		12.9		(38.6	)
Clean energy related (1)		(27.9	)		48.7			20.8			(22.9	)		27.9		5.0
Acquisition costs		(1.6	)		0.1			(1.5	)		(1.4	)		0.2		(1.2	)
Corporate (4)		(22.9	)		14.8			(8.1	)		(20.1	)		10.0		(10.1	)
Adjusted three months	$	(109.6	)	$	77.9		$	(31.7	)	$	(95.9	)	$	51.0	$	(44.9	)

	2021									2020
							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	$	(106.4	)	$	26.6		$	(79.8	)	$	(103.3	)	$	25.9	$	(77.4	)
Clean energy related (1)		(56.9	)		111.1			54.2			(46.8	)		104.3		57.5
Acquisition costs (2)		(13.3	)		1.7			(11.6	)		(4.1	)		0.4		(3.7	)
Corporate (3) (4)		(49.0	)		28.0			(21.0	)		(30.5	)		25.7		(4.8	)
Corporate, as reported		(225.6	)		167.4			(58.2	)		(184.7	)		156.3		(28.4	)
Adjustments
Transaction-related costs (2)		10.2			(1.5	)		8.7			—			—		—
U.K.-related tax rate change (3)		—			19.3			19.3			—			—		—
Components of Corporate    Segment, as adjusted
Interest and banking costs		(106.4	)		26.6			(79.8	)		(103.3	)		25.9		(77.4	)
Clean energy related (1)		(56.9	)		111.1			54.2			(46.8	)		104.3		57.5
Acquisition costs		(3.1	)		0.2			(2.9	)		(4.1	)		0.4		(3.7	)
Corporate (4)		(49.0	)		47.3			(1.7	)		(30.5	)		25.7		(4.8	)
Adjusted six months	$	(215.4	)	$	185.2		$	(30.2	)	$	(184.7	)	$	156.3	$	(28.4	)

(1) Pretax loss for the three-month periods ended June 30, 2021 and 2020 is presented net of amounts attributable to noncontrolling interests of $9.0 million and $6.6 million, respectively.  Pretax loss for the six-month periods ended June 30, 2021 and 2020 is presented net of amounts attributable to noncontrolling interests of $18.8 million and $15.0 million, respectively.

(2) In second quarter 2021, we incurred transaction-related costs, which include legal, consulting and other professional fees associated with the due diligence related to our now terminated agreement to acquire certain Willis Towers Watson plc brokerage operations.

(3) In second quarter 2021, the U.K. government enacted tax legislation that increases the corporate income tax rate from 19.0% to 25.0% effective in 2023.  We incurred additional income tax expense in the quarter to adjust certain deferred income tax liabilities to the higher income tax rate.  

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(4) Corporate pretax loss includes a net unrealized foreign exchange remeasurement loss of $1.1 million in second quarter 2021 and a net unrealized foreign exchange remeasurement loss of $5.1 million in second quarter 2020. Corporate pretax loss includes a net unrealized foreign exchange remeasurement loss of $5.2 million in the six-month period ended June 30, 2021 and a net unrealized foreign exchange remeasurement gain of $7.3 million in the six-month period ended June 30, 2020.  

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

Clean energy related - Includes the operating results related to our investments in clean coal production plants and Chem-Mod LLC.  

Acquisition costs - Consists of external professional fees, due diligence and other costs incurred related to our acquisitions.

Corporate - Consists of overhead allocations mostly related to corporate staff compensation and other corporate level activities, cross-selling and motivational meetings for our production staff and field management, expenses related to our corporate headquarters and the impact of foreign currency translation.  The income tax benefit of stock based awards that vested or were settled in the six‑month periods ended June 30, 2021 and 2020 was $27.1 million and $14.3 million, respectively, and is included in the table above in the Corporate line.  

Clean energy investments - We have investments in limited liability companies that own 29 clean coal production plants developed by us and six clean coal production plants we purchased from a third party.  All 35 plants produce refined coal using propriety technologies owned by Chem-Mod LLC.  We believe that the production and sale of refined coal at these plants are qualified to receive refined coal tax credits under IRC Section 45.  The 14 2009 Era Plants received tax credits through 2019 and the 21 2011 Era Plants can receive tax credits through 2021.

The following table provides a summary of our clean coal plant investments as of June 30, 2021 (in millions):

	Our Portion of Estimated
	Low Range		High Range
	2021		2021
	Adjusted		Adjusted
	After-tax		After-tax
	Earnings		Earnings
Investments that own 2009 Era Plants
14   2009 Not in active production during 2021	$	—	$	—
Investments that own 2011 Era Plants
21   2011 Under long-term production contracts		63.0		71.0
Chem-Mod royalty income, net of noncontrolling interests		12.0		14.0

The estimated earnings information in the table reflects management’s current best estimate of the 2021 low and high ranges of after‑tax earnings based on early production estimates from the host utilities, other operating assumptions, including current U.S. federal income tax laws. However, coal-fired power plants may not ultimately produce refined fuel at estimated levels due to seasonal electricity demand, production costs, natural gas prices, weather conditions, as well as many other operational, regulatory and environmental compliance reasons.  Future changes in EPA regulations or U.S. federal income tax laws might materially impact these estimates.  Please refer to our filings with the SEC, including Item 1A, “Risk Factors,” on pages 20, 21 and 22 of our Annual Report on Form 10‑K for the fiscal year ended December 31, 2020, for a more detailed discussion of these and other factors that could impact the information above.

Our investment in Chem-Mod LLC generates royalty income from refined coal production plants owned by those limited liability companies in which we invest as well as refined coal production plants owned by other unrelated parties. Future changes in EPA regulations or U.S. federal income tax laws might materially impact the earnings estimates.

Financial Condition and Liquidity

Liquidity describes the ability of a company to generate sufficient cash flows to meet the cash requirements of its business operations.  The insurance brokerage industry is 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.

In light of the economic uncertainty caused by COVID-19, subsequent to the first quarter of 2020, we preserved liquidity during 2020 by reducing capital expenditures for the remainder of 2020 and made working capital process changes such as moving more cash into

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the U.S. from our international operations, pursued collections on receivables from our customers and partners and renegotiated longer payment terms on vendor payables.  We also slowed down our acquisition program in the second and third quarters of 2020.  Some of these initiatives and trends continued into first quarter 2021 and will continue in the foreseeable future.  We believe we have sufficient liquidity on hand to continue business operations during this uncertain period.  If we experience a significant reduction in revenue in the future, we have additional alternatives to maintain liquidity, including use of common stock to fund future acquisitions.

Cash Flows From Operating Activities

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 (defined below) will provide us with adequate resources to meet our liquidity needs in the foreseeable future.  To fund acquisitions made during 2020 and for the six-month period ended June 30, 2021, 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.

Cash provided by operating activities was $688.3 million and $802.2 million for the six-month periods ended June 30, 2021 and 2020, respectively.  The decrease in cash provided by operating activities during the six-month period ended June 30, 2021 compared to the same period in 2020 was primarily due to increases in the amount of net income taxes paid and interest on debt paid in 2021 compared to the same period in 2020.  During 2020, we managed our working capital in terms of receivables and payables as a cautionary step to protect liquidity during this uncertain period.  During the six-month period ended June 30, 2021, employee matching contributions to the 401(k) plan of $63.6 million relating to 2020 were funded using common stock.  During the six-month period ended June 30, 2020, employee matching contributions to the 401(k) plan of $59.4 million relating to 2019 were funded using cash.

Cash provided by operating activities for the six-month periods ended June 30, 2021 and 2020 was unfavorably impacted by timing differences in the receipts and disbursements of client fiduciary related balances in 2021 compared to 2020.  The following table summarizes two lines from our consolidated statement of cash flows and provides information that management believes is helpful when comparing changes in client fiduciary related balances for the six-month period ended June 30, 2021with the same period in 2020 (in millions):

	Six-month period ended June 30,
	2021			2020
Net change in premiums and fees receivable	$	(1,678.7	)	$	(1,569.1	)
Net change in premiums payable to underwriting enterprises		1,617.4			1,723.6
Net cash (used) provided by the above	$	(61.3	)	$	154.5

Our cash flows from operating activities are primarily derived from our earnings from operations, as adjusted for our non‑cash expenses, which include depreciation, amortization, change in estimated acquisition earnout payables, deferred compensation, restricted stock and stock‑based and other non-cash compensation expenses.  Cash provided by operating activities can be unfavorably impacted if the amount of IRC Section 45 tax credits generated (which is the amount we recognize for financial reporting purposes) is greater than the amount of tax credits utilized to reduce our tax cash obligations.  Excess tax credits produced during the period result in an increase to our deferred tax assets, which is a net use of cash related to operating activities.  Please see “Clean Energy Investments” below for more information on their potential future impact on cash provided by operating activities.

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 $1,052.3 million and $849.9 million for the six-month periods ended June 30, 2021 and 2020, respectively.  Net earnings attributable to controlling interests were $572.3 million and $500.0 million for the six-month periods ended June 30, 2021 and 2020, respectively.  We believe that EBITDAC items are indicators of trends in liquidity.  From a balance sheet perspective, we believe the focus should not be on premiums and fees receivable, premiums payable or restricted cash for trends in liquidity.  Net cash flows provided by operations will vary substantially from quarter to quarter and year to year because of the variability in the timing of premiums and fees receivable and premiums payable.  We believe that in order to consider these items in assessing our trends in liquidity, they should be looked at in a combined manner, because changes in these balances are interrelated and are based on the timing of premium payments, both to and from us.  In addition, funds legally restricted as to our use relating to premiums and clients’ claim funds held by us in a fiduciary capacity are presented in our consolidated balance sheet as “Restricted cash” and have not been included in determining our overall liquidity.  

Our policy for funding our defined benefit pension plan is to contribute amounts at least sufficient to meet the minimum funding requirements under the IRC.  The Employee Retirement 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 2021 plan year, nor were we required to make any minimum contributions to the plan for the 2020 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

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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, 2021 and 2020. We are not considering making any discretionary contributions to the plan in 2021, but may be required to make significantly larger minimum contributions to the plan in future periods.

Cash Flows From Investing Activities

Capital Expenditures - Capital expenditures were $59.2 million and $58.8 million for the six-month periods ended June 30, 2021 and 2020, respectively.  In 2021, we expect total expenditures for capital improvements to be approximately $140.0 million, part of which is related to expenditures on office moves and updating computer systems and equipment.  

Acquisitions - Cash paid for acquisitions, net of cash and restricted cash acquired, was $551.6 million and $82.9 million in the six‑months periods ended June 30, 2021 and 2020, respectively.  In addition, during the six-month period ended June 30, 2021, we issued 0.7 million shares ($79.8 million) of our common stock as payment for a portion of the total consideration paid for 2021 acquisitions and earnout payments made in 2021.  During the six-month period ended June 30, 2020, we issued 1.9 million shares ($182.1 million) of our common stock as payment for consideration paid for 2020 acquisitions and earnout payments made in 2020.  We completed 14 acquisitions and 12 acquisitions in the six-month periods ended June 30, 2021 and 2020, respectively.  Annualized revenues of businesses acquired in the six-month periods ended June 30, 2021 and 2020 totaled approximately $173.8 million and $138.1 million, respectively.  During 2020, the company made the decision to fund the majority of the consideration paid for acquisitions and earnout payments made using company stock to preserve cash.  For the remainder of 2021, we expect to use cash from operations, our Credit Agreement, new debt 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 the six-month periods ended June 30, 2021 and 2020, we sold several books of business and recognized net gains of $4.7 million and $1.2 million, respectively. We received net cash proceeds of $9.4 million and $2.5 million related to the 2021 and 2020 transactions, respectively.  

Clean Energy Investments - During the period from 2009 through 2020, we have made significant investments in clean energy operations capable of producing refined coal that we believe qualifies for tax credits under IRC Section 45.  Our current estimate of the 2021 annual adjusted net after-tax earnings, including IRC Section 45 tax credits, which will be produced from all of our clean energy investments in 2021, is $75.0 million to $85.0 million.  The IRC Section 45 tax credits generate positive cash flow by reducing the amount of federal income taxes we pay, which is offset by the operating expenses of the plants, by capital expenditures related to the redeployment, and in some cases the relocation of refined coal plants.  We anticipate positive net cash flow related to IRC Section 45 activity in 2021.  However, there are several variables that can impact net cash flow from clean energy investments in any given year. Therefore, accurately predicting positive or negative cash flow in particular future periods is not possible at this time.  Nonetheless, if current ownership interests remain the same, if capital expenditures related to redeployment and relocation of refined coal plants remain as currently anticipated, and if we continue to generate sufficient taxable income to use the tax credits produced by our IRC Section 45 investments, we anticipate that these investments will continue to generate positive net cash flows through at least 2025.  While we cannot precisely forecast the cash flow impact in any particular period, we anticipate that the net cash flow impact of these investments will be positive overall.  Please see “Clean energy investments” on page 62 for a more detailed description of these investments and their risks and uncertainties.  Please see “Other Information” on page 39 for the cash flow impact of the expiration of laws governing tax credits.

Cash Flows From Financing Activities

On June 7, 2019, we entered into an amendment and restatement to our multicurrency credit agreement dated April 8, 2016 (which we refer to as the Credit Agreement).  On August 27, 2020, we entered into an amendment to the Credit Agreements.

There were no borrowings outstanding under the Credit Agreement at June 30, 2021.  Due to the outstanding letters of credit, $1,185.8 million remained available for potential borrowings under the Credit Agreement at June 30, 2021.  

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, 2021, we borrowed $925.0 million and repaid $925.0 million under our Credit Agreement.  In the six-month period ended June 30, 2020, we borrowed $2,550.0 million and repaid $2,970.0 million under our Credit Agreement.  Principal uses of the 2021 and 2020 borrowings under the Credit Agreement were to fund acquisitions, earnout payments related to acquisitions and general corporate purposes.  

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On September 16, 2020, 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 amendment, among other things, extended the expiration date of the Premium Financing Debt Facility from July 18, 2021 to September 15, 2022, added six-months variable limits to Facility B NZ$ beginning in 2021 and increased the total commitment for the AU$ denominated tranche from AU$245.0 million to AU$310.0 million. The Premium Financing Debt Facility is comprised of: (i) Facility B, is separated into AU$260.0 million and NZ$25.0 million tranches, (ii) Facility C, an AU$50.0 million equivalent multi-currency overdraft tranche and (iii) Facility D, a NZ$15.0 million equivalent multi-currency overdraft tranche. At June 30, 2021, AU$195.0 million and NZ$0.0 million of borrowings were outstanding under Facility B, AU$17.4 million of borrowings outstanding under Facility C and NZ$8.0 million of borrowings were outstanding under Facility D, which in aggregate amount to US$166.1 million of borrowings outstanding under the Premium Financing Debt Facility.  

On January 30, 2020, we closed and funded an offering of $575.0 million aggregate principal amount of fixed rate private placement unsecured senior notes. The weighted average maturity of these notes is 11.7 years and the weighted average interest rate is 4.23% per annum after giving effect to underwriting costs and the net hedge loss. In 2017 and 2018, we entered into pre-issuance interest rate hedging transactions related to these private placements.  We realized a net cash loss of approximately $8.9 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over a ten year period.

The notes consist of the following tranches:

• $30.0 million of 3.75% senior notes due in 2027;

• $341.0 million of 3.99% senior notes due in 2030;

• $69.0 million of 4.09% senior notes due in 2032;

• $79.0 million of 4.24% senior notes due in 2035; and

• $56.0 million of 4.49% senior notes due in 2040

We used these offerings to repay certain existing indebtedness and for general corporate purposes, including to fund acquisitions.

On February 10, 2021, we closed a private placement of $100.0 million aggregate principal amount of unsecured senior notes.  The unsecured senior notes were issued with an interest rate of 2.44% and are due in 2036.  We used the proceeds of these offerings in part to fund the $75.0 million February 10, 2021 Series D note maturity, and for acquisitions and general corporate purposes.  The weighted average interest rate is 3.97% after giving effect to a net hedging loss.  In 2018, we entered into a pre-issuance interest rate hedging transaction related to this private placement.  We realized a net cash loss of approximately $22.9 million on the hedging transactions that will be recognized on a pro rata basis as an increase in our reported interest expense over ten years of the total 15‑year notes.

On May 5, 2021, we closed and funded a private placement of $75.0 million aggregate principal amount of unsecured senior notes.  The unsecured senior notes were issued with an interest rate of 2.46% and are due in 2036.  We used the proceeds of this offering in part to fund acquisitions and general corporate purposes.  The weighted average interest rate is 3.98% after giving effect to a net hedging loss.  In 2018, we entered into a pre-issuance interest rate hedging transaction related to this private placement.  We realized a net cash loss of approximately $17.2 million on the hedging transactions that will be recognized on a pro rata basis as an increase in our reported interest expense over ten years of the total 15‑year notes.

On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as the 2031 Notes) and $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 Notes and together with the 2031 Notes, the Notes).  The weighted average interest rate is 3.13% per annum after giving effect to underwriting costs and the net hedge loss.  In 2018 and 2019, we entered into a pre-issuance interest rate hedging transaction related to these notes.  We realized a net cash loss of approximately $57.8 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over a ten year period.  Prior to the termination of our agreement to acquire certain Willis Tower Watson plc brokerage operations, we expected to use the net proceeds of this offering to fund a portion of the cash consideration payable in connection with this transaction.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as other general corporate purposes.  

The offering of the Notes was made pursuant to a shelf registration statement filed with the SEC.  The relevant terms of the Notes, the Indenture and the Officers’ Certificate are further described under the caption “Description of Notes” in the prospectus supplement dated May 13, 2021, filed with the SEC on May 17, 2021.

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The 2031 Notes have a special optional redemption whereby we may, at our option, redeem the 2031 Notes, in whole and not in part, by providing notice of such redemption to the holders of the 2031 Notes within 30 days following a Willis Tower Watson plc transaction termination event, at a redemption price equal to 101% of the aggregate principal amount of the 2031 Notes, plus any accrued and unpaid interest. These notes will be redeemed on August 13, 2021.  The impact of the extinguishment of this debt, which includes the redemption price premium, the unamortized discount amount on the debt issuance and the write-off of all the debt acquisition costs, is estimated to be an after-tax loss of $12.0 million to $14.0 million that will be recognized in third quarter 2021. The 2051 Notes are not subject to the special optional redemption.

At June 30, 2021, we had $1,500.0 million of Senior Notes, $4,448.0 million of corporate‑related borrowings outstanding under separate note purchase agreements entered into during the period from 2011 to 2021, no borrowings outstanding under our credit facility, $166.1 million outstanding under our Premium Financing Debt Facility and a cash and cash equivalent balance of $3,204.1 million.  See Note 7 to our June 30, 2021 unaudited consolidated financial statements for a discussion of the terms of the Senior Notes, Note purchase agreements, the Credit Agreement and the Premium Financing Debt Facility.  

Consistent with past practice, as of June 30, 2021, we had entered into pre-issuance hedging transactions of $400.0 million for 2022, $250.0 million for 2023 and $350.0 million for 2024.  

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, 2021.  

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.  

In the six-month period ended June 30, 2021, we declared $194.9 million in cash dividends on our common stock, or $0.48 per common share, a 7% increase over the six-month period ended June 30, 2020.  On July 28, 2021, we announced a quarterly dividend for third quarter 2021 of $0.48 per common share. This dividend level in 2021 will result in annualized net cash used by financing activities in 2021 of approximately $396.6 million (based on the number of outstanding shares as of June 30, 2021) or an anticipated increase in cash used of approximately $22.0 million compared to 2020.  We make no assurances regarding the amount of any future dividend payments.

Shelf Registration Statement - On November 15, 2019, 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 our common stock.  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 shares under this registration statement.  On November 15, 2016, we also filed a shelf registration statement on Form S-4 with the SEC, registering 10.0 million shares of our common stock that we may offer and issue from time to time in connection with the future acquisitions of other businesses, assets or securities. At June 30, 2021, 3.6 million shares remained available for issuance under this registration statement.

Common Stock Repurchases - We have in place a common stock repurchase plan, last amended by our board of directors in 2008, for up to 10.0 million shares (7.3 million shares remain available).  During the six-month periods ended June 30, 2021 and 2020, 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.  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.

Public Offering of Common Stock - On May 12, 2021, we entered into an Underwriting Agreement with Morgan Stanley & Co. LLC to issue 9.0 million shares of our common stock in a public offering. On May 12, 2021, we agreed to price the offering of 9.0 million shares of our common stock at $142.00 and granted the underwriters in the offering a 30-day option to purchase up to an additional 1.3 million shares of our common stock at the same price. On May 12, 2021, the underwriters exercised the option to purchase an additional 1.3 million shares. The offering closed on May 17, 2021 and 10.3 million shares of our stock were issued for net proceeds, after underwriting discounts and other expenses related to this offering, of $1,437.9 million. Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of the offering to fund the acquisition.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as other general corporate purposes.

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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, 2021 and 2020, were $63.4 million and $58.2 million, respectively.  On May 16, 2017, our stockholders approved the 2017 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved 2014 Long-Term Incentive Plan.  All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP.  Awards which 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 9.4 million shares (less any shares of restricted stock issued under the LTIP - 1.8 million shares of our common stock were available for this purpose as of June 30, 2021) were available for grant under the LTIP at June 30, 2021.  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, 2021 and 2020, 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) $34.5 million and $30.3 million related to the plan in the six-month periods ended June 30, 2021 and 2020, respectively.  Our board of directors authorized the use of common stock to fund our 2020 employer matching contributions to the 401(k) plan, which we funded in February 2021.  During second quarter 2021, our board of directors authorized a 5.0% employer match on eligible compensation to the 401(k) plan for the 2021 plan year and the possible use of common stock to fund our 2021 employer matching contributions, which is expected to be funded in February 2022.

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

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Contractual Obligations and Commitments

In connection with our investing and operating activities, we have entered into certain contractual obligations and commitments.  See Note 14 to the June 30, 2021 unaudited consolidated financial statements for a discussion of these obligations and commitments.  In addition, see Note 17 to the consolidated financial statements included in our Annual Report on Form 10‑K for the year ended December 31, 2020 for additional discussion of these obligations and commitments.

Off-Balance Sheet Arrangements

See Note 14 to the June 30, 2021 unaudited consolidated financial statements for a discussion of our off‑balance sheet arrangements.  In addition, see Notes 8, 14 and 17 to the consolidated financial statements included in our Annual Report on Form 10‑K for the year ended December 31, 2020 for additional discussion of these off-balance sheet arrangements.

Critical Accounting Policies

There have been no changes in our critical accounting policies, 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, 2020.

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, 2021.  We did not have any material dispositions during the six-month period ended June 30, 2021.

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, 2021 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, 2021 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, 2021.

At June 30, 2021, we had $5,948.0 million of borrowings outstanding under our various senior notes and note purchase agreements.  The aggregate estimated fair value of these borrowings at June 30, 2021 was $6,502.3 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.  

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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, 2021 and the resulting fair values would have been $1,115.2 million higher than their carrying value (or $7,063.2 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, 2021 and the resulting fair values would have been $66.0 million higher than their carrying value (or $6,014.0 million).

At June 30, 2021, we had $166.1 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, 2021, and the resulting fair value is not materially different from their carrying value.

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, 2020 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, 2021 (a weakening of the U.S. dollar), earnings before income taxes would have increased by approximately $31.1 million.  Assuming a hypothetical favorable change of 10% in the average foreign currency exchange rate for the six-month period ended June 30, 2021 (a strengthening of the U.S. dollar), earnings before income taxes would have decreased by approximately $17.0 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, 2021 and 2020, we had several monthly put/call options in place with an external financial institution that are designed to hedge a significant portion of our future U.K. currency revenues through various future payment dates.  In addition, during the six-month periods ended June 30, 2021 and 2020, 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 U.K. and Indian 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, 2021 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, 2021.  See Note 13 to our unaudited consolidated financial statements for the changes in fair value of these derivative instruments reflected in comprehensive earnings at June 30, 2021.

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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.

Part II - Other Information

Item 1. Legal Proceedings

Please see the information set forth in Note 14 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, 2020 should be considered alongside the information contained in this report.

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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) of Gallagher for each fiscal month in the three-month period ended June 30, 2021:

					Total Number of		Maximum Number
	Total				Shares Purchased		of Shares that May
	Number of		Average		as Part of Publicly		Yet be Purchased
	Shares		Price Paid		Announced Plans		Under the Plans
Period	Purchased (1)		per Share (2)		or Programs (3)		or Programs (3)
April 1 through April 30, 2021		9,616	$	133.32		—		7,287,019
May 1 through May 31, 2021		2,406		147.48		—		7,287,019
June 1 through June 30, 2021		15,237		138.83		—		7,287,019
Total		27,259	$	137.65		—

(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 10 to the June 30, 2021 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 rabbi 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 2021, 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 2021 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 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.

- 71 -

(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 new 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 U.S. Securities and Exchange Commission’s rules, accelerated stock repurchases, private transactions or other means, depending on satisfactory market conditions, applicable legal requirements and other factors. The new repurchase plan has no expiration date and we are under no commitment or obligation to repurchase any particular amount of our common stock under this plan.  At our discretion, we may suspend the new repurchase plan at any time. Previously, we had a common stock repurchase plan that the board of directors adopted on May 10, 1988 and has periodically amended since that date to authorize additional shares for repurchase (the last amendment was on January 24, 2008 and approved the repurchase of 10,000,000 shares).  We did not repurchase shares of our common stock from the period of July 1, 2021 through date of the filing of this Form 10-Q.

Item 6. Exhibits

Filed with this Form 10‑Q

4.1	Indenture, dated as of May 20, 2021, between the Company and The Bank of New York Mellon Trust Company, N.A., as Trustee (incorporated by reference to the same exhibit number to our Form 8-K Current Report dated May 20, 2021, 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 Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
104	Cover Page Interactive Data File formatted in Inline XBRL (included as Exhibit 101).

- 72 -

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 30, 2021	By:	/s/ Douglas K. Howell
		Douglas K. Howell Vice President and Chief Financial Officer (principal financial officer and duly authorized officer)

- 73 -

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 30, 2021

/s/ J. Patrick Gallagher, Jr.

J. Patrick Gallagher, Jr.
President 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 30, 2021

/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, 2021 (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 30, 2021

/s/ J. Patrick Gallagher, Jr.

J. Patrick Gallagher, Jr.
President 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, 2021 (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 30, 2021

/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.

XML

Cover Page	6 Months Ended
	Jun. 30, 2021 shares
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Period End Date	Jun. 30, 2021
Document Fiscal Period Focus	Q2
Entity Interactive Data Current	Yes
Entity Central Index Key	0000354190
Current Fiscal Year End Date	--12-31
Entity Registrant Name	ARTHUR J. GALLAGHER & CO.
Entity File Number	1-09761
Document Transition Report	false
Entity Tax Identification Number	36-2151613
Entity Incorporation, State or Country Code	DE
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, Address Line One	2850 Golf Road
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	206,750,000
Document Quarterly Report	true

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Consolidated Statement of Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues before reimbursements	$ 1,896.8	$ 1,551.6	$ 4,029.4	$ 3,380.8
Reimbursements	36.7	32.4	69.1	70.1
Total revenues	1,933.5	1,584.0	4,098.5	3,450.9
Compensation	937.1	815.6	1,912.7	1,711.8
Operating	253.4	214.8	486.5	472.5
Reimbursements	36.7	32.4	69.1	70.1
Cost of revenues from clean coal activities	268.8	161.2	577.9	346.6
Interest	56.2	50.0	104.3	100.5
Depreciation	37.2	34.4	75.3	71.2
Amortization	108.0	88.2	213.2	223.8
Change in estimated acquisition earnout payables	13.8	15.7	28.8	(73.3)
Total expenses	1,711.2	1,412.3	3,467.8	2,923.2
Earnings before income taxes	222.3	171.7	630.7	527.7
Provision for income taxes	20.5	9.9	35.2	10.5
Net earnings	201.8	161.8	595.5	517.2
Net earnings attributable to noncontrolling interests	11.6	8.1	23.2	17.2
Net earnings attributable to controlling interests	$ 190.2	$ 153.7	$ 572.3	$ 500.0
Basic net earnings per share	$ 0.94	$ 0.81	$ 2.89	$ 2.64
Diluted net earnings per share	0.92	0.79	2.83	2.58
Dividends declared per common share	$ 0.48	$ 0.45	$ 0.96	$ 0.90
Commissions [Member]
Revenues before reimbursements	$ 977.1	$ 827.5	$ 2,102.5	$ 1,844.7
Broker Fees [Member]
Revenues before reimbursements	540.9	459.7	1,094.7	967.0
Supplemental Revenue [Member]
Revenues before reimbursements	55.2	50.3	122.0	109.3
Contingent Revenue [Member]
Revenues before reimbursements	43.3	37.4	106.6	82.5
Investment Income [Member]
Revenues before reimbursements	18.1	16.0	35.2	34.6
Net Gains on Divestitures [Member]
Revenues before reimbursements	0.6	1.0	4.7	1.2
Clean Coal Activities [Member]
Revenues before reimbursements	261.0	159.5	561.6	341.3
Other Net Revenue [Member]
Revenues before reimbursements	$ 0.6	$ 0.2	$ 2.1	$ 0.2

XML

Consolidated Statement of Comprehensive Earnings - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 201.8	$ 161.8	$ 595.5	$ 517.2
Change in pension liability, net of taxes	0.1		1.1	1.2
Foreign currency translation, net of taxes	30.4	250.7	88.4	(130.6)
Change in fair value of derivative investments, net of taxes	(33.2)	(1.8)	23.6	(93.2)
Comprehensive earnings	199.1	410.7	708.6	294.6
Comprehensive earnings attributable to noncontrolling interests	11.3	7.3	23.5	17.6
Comprehensive earnings attributable to controlling interests	$ 187.8	$ 403.4	$ 685.1	$ 277.0

XML

Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Cash and cash equivalents	$ 3,204.1	$ 664.6
Restricted cash	3,170.9	2,909.7
Premiums and fees receivable	8,394.8	6,436.0
Other current assets	1,169.5	1,113.9
Total current assets	15,939.3	11,124.2
Fixed assets - net	454.9	450.7
Deferred income taxes	1,126.3	1,085.8
Other noncurrent assets	860.8	769.9
Right-of-use assets	358.3	373.9
Goodwill	6,630.3	6,127.0
Amortizable intangible assets - net	2,447.3	2,399.9
Total assets	27,817.2	22,331.4
Premiums payable to underwriting enterprises	9,716.7	7,784.6
Accrued compensation and other current liabilities	1,408.4	1,596.2
Deferred revenue - current	530.1	475.6
Premium financing debt	166.1	203.6
Corporate related borrowings - current	200.0	75.0
Total current liabilities	12,021.3	10,135.0
Corporate related borrowings - noncurrent	5,712.2	4,266.0
Deferred revenue - noncurrent	62.0	65.7
Lease liabilities - noncurrent	302.6	320.9
Other noncurrent liabilities	1,365.1	1,311.1
Total liabilities	19,463.2	16,098.7
Stockholders' equity:
Common stock - issued and outstanding 206.8 shares in 2021 and 193.7 shares in 2020	206.8	193.7
Capital in excess of par value	5,887.3	4,264.4
Retained earnings	2,749.1	2,371.7
Accumulated other comprehensive loss	(530.5)	(643.6)
Stockholders' equity attributable to controlling interests	8,312.7	6,186.2
Stockholders' equity attributable to noncontrolling interests	41.3	46.5
Total stockholders' equity	8,354.0	6,232.7
Total liabilities and stockholders' equity	$ 27,817.2	$ 22,331.4

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Consolidated Balance Sheet (Parenthetical) - shares shares in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Common stock - issued shares	206.8	193.7
Common stock - outstanding shares	206.8	193.7

XML

Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net earnings	$ 595.5	$ 517.2
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(6.3)	(1.2)
Depreciation and amortization	288.5	295.0
Change in estimated acquisition earnout payables	28.8	(73.3)
Amortization of deferred compensation and restricted stock	31.8	30.8
Stock-based and other noncash compensation expense	8.2	6.7
Payments on acquisition earnouts in excess of original estimates	(24.3)	(14.3)
Effect of changes in foreign exchange rates	6.5	(6.5)
Net change in premiums and fees receivable	(1,678.7)	(1,569.1)
Net change in deferred revenue	36.4	18.4
Net change in premiums payable to underwriting enterprises	1,617.4	1,723.6
Net change in other current assets	(52.8)	103.1
Net change in accrued compensation and other current liabilities	(53.9)	(206.4)
Net change in income taxes payable	(30.9)	34.3
Net change in deferred income taxes	(23.5)	(79.3)
Net change in other noncurrent assets and liabilities	(54.4)	23.2
Net cash provided by operating activities	688.3	802.2
Cash flows from investing activities:
Capital expenditures	(59.2)	(58.8)
Cash paid for acquisitions, net of cash and restricted cash acquired	(551.6)	(82.9)
Net proceeds from sales of operations/books of business	9.4	2.5
Net funding of investment transactions	(0.7)	(0.6)
Net cash used by investing activities	(602.1)	(139.8)
Cash flows from financing activities:
Payments on acquisition earnouts	(115.8)	(30.7)
Proceeds from issuance of common stock	1,502.0	58.2
Payments to noncontrolling interests	(21.6)	(81.4)
Dividends paid	(202.4)	(173.5)
Net borrowings on premium financing debt facility	(37.8)	(62.7)
Borrowings on line of credit facility	925.0	2,550.0
Repayments on line of credit facility	(925.0)	(2,970.0)
Net borrowings of corporate related long-term debt	1,586.5	524.8
Debt acquisition costs	(14.6)	(1.3)
Settlements on terminated interest rate swaps	(31.9)	(65.9)
Net cash provided (used) by financing activities	2,664.4	(252.5)
Effect of changes in foreign exchange rates on cash and cash equivalents and restricted cash	50.1	(31.1)
Net increase in cash, cash equivalents and restricted cash	2,800.7	378.8
Cash, cash equivalents and restricted cash at beginning of period	3,574.3	2,623.9
Cash, cash equivalents and restricted cash at end of period	$ 6,375.0	$ 3,002.7

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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, 2019	$ 5,215.5	$ 188.1	$ 3,825.7	$ 1,901.3	$ (759.6)	$ 60.0
Beginning balance (in shares) at Dec. 31, 2019		188.1
Net earnings	355.4			346.3		9.1
Net purchase of subsidiary shares from noncontrolling interests	(10.8)					(10.8)
Dividends paid to noncontrolling interests	(18.9)					(18.9)
Net change in pension asset/liability, net of taxes	1.2				1.2
Foreign currency translation	(380.1)				(381.3)	1.2
Change in fair value of derivative instruments, net of taxes	(91.4)				(91.4)
Compensation expense related to stock option plan grants	3.4		3.4
Common stock issued in: purchase transactions	73.1	$ 0.7	72.4
Common stock issued in: purchase transactions (in shares)		0.7
Stock option plans	17.9	$ 0.4	17.5
Stock option plans (in shares)		0.4
Employee stock purchase plan	6.0	$ 0.1	5.9
Employee stock purchase plan (in shares)		0.1
Deferred compensation and restricted stock	15.0	$ (0.3)	15.3
Deferred compensation and restricted (in shares)		0.3
Cash dividends declared on common stock	(86.2)			(86.2)
Ending balance at Mar. 31, 2020	5,070.1	$ 189.6	3,909.6	2,161.4	(1,231.1)	40.6
Ending balance, (in shares) at Mar. 31, 2020		189.6
Beginning balance at Dec. 31, 2019	5,215.5	$ 188.1	3,825.7	1,901.3	(759.6)	60.0
Beginning balance (in shares) at Dec. 31, 2019		188.1
Net earnings	517.2
Net change in pension asset/liability, net of taxes	1.2
Change in fair value of derivative instruments, net of taxes	(93.2)
Compensation expense related to stock option plan grants	6.7
Ending balance at Jun. 30, 2020	5,534.5	$ 191.5	4,051.0	2,228.3	(982.2)	45.9
Ending balance, (in shares) at Jun. 30, 2020		191.5
Beginning balance at Mar. 31, 2020	5,070.1	$ 189.6	3,909.6	2,161.4	(1,231.1)	40.6
Beginning balance (in shares) at Mar. 31, 2020		189.6
Net earnings	161.8			153.7		8.1
Net purchase of subsidiary shares from noncontrolling interests	4.3					4.3
Dividends paid to noncontrolling interests	(6.3)					(6.3)
Foreign currency translation	249.9				250.7	(0.8)
Change in fair value of derivative instruments, net of taxes	(1.8)				(1.8)
Compensation expense related to stock option plan grants	3.3		3.3
Common stock issued in: purchase transactions	110.9	$ 1.2	109.7
Common stock issued in: purchase transactions (in shares)		1.2
Stock option plans	21.9	$ 0.5	21.4
Stock option plans (in shares)		0.5
Employee stock purchase plan	12.4	$ 0.1	12.3
Employee stock purchase plan (in shares)		0.1
Deferred compensation and restricted stock	5.2	$ (0.1)	5.3
Deferred compensation and restricted (in shares)		0.1
Cash dividends declared on common stock	(86.8)			(86.8)
Ending balance at Jun. 30, 2020	5,534.5	$ 191.5	4,051.0	2,228.3	(982.2)	45.9
Ending balance, (in shares) at Jun. 30, 2020		191.5
Beginning balance at Dec. 31, 2020	$ 6,232.7	$ 193.7	4,264.4	2,371.7	(643.6)	46.5
Beginning balance (in shares) at Dec. 31, 2020	193.7	193.7
Net earnings	$ 393.7			382.1		11.6
Dividends paid to noncontrolling interests	(10.3)					(10.3)
Net change in pension asset/liability, net of taxes	1.0				1.0
Foreign currency translation	58.6				58.0	0.6
Change in fair value of derivative instruments, net of taxes	56.8				56.8
Compensation expense related to stock option plan grants	3.7		3.7
Common stock issued in: purchase transactions	67.5	$ 0.6	66.9
Common stock issued in: purchase transactions (in shares)		0.6
Stock option plans	30.2	$ 0.6	29.6
Stock option plans (in shares)		0.6
Employee stock purchase plan	7.0	$ 0.1	6.9
Employee stock purchase plan (in shares)		0.1
Shares issued to benefit plans	71.4	$ 0.6	70.8
Shares issued to benefit plans (in shares)		0.6
Deferred compensation and restricted stock	37.9	$ (0.3)	38.2
Deferred compensation and restricted (in shares)		0.3
Cash dividends declared on common stock	(94.9)			(94.9)
Ending balance at Mar. 31, 2021	6,779.5	$ 195.9	4,404.1	2,658.9	(527.8)	48.4
Ending balance, (in shares) at Mar. 31, 2021		195.9
Beginning balance at Dec. 31, 2020	$ 6,232.7	$ 193.7	4,264.4	2,371.7	(643.6)	46.5
Beginning balance (in shares) at Dec. 31, 2020	193.7	193.7
Net earnings	$ 595.5
Net change in pension asset/liability, net of taxes	1.1
Change in fair value of derivative instruments, net of taxes	23.6
Compensation expense related to stock option plan grants	$ 8.2
Stock option plans (in shares)	0.9
Ending balance at Jun. 30, 2021	$ 8,354.0	$ 206.8	5,887.3	2,749.1	(530.5)	41.3
Ending balance, (in shares) at Jun. 30, 2021	206.8	206.8
Beginning balance at Mar. 31, 2021	$ 6,779.5	$ 195.9	4,404.1	2,658.9	(527.8)	48.4
Beginning balance (in shares) at Mar. 31, 2021		195.9
Net earnings	201.8			190.2		11.6
Net purchase of subsidiary shares from noncontrolling interests	(11.0)					(11.0)
Dividends paid to noncontrolling interests	(7.4)					(7.4)
Net change in pension asset/liability, net of taxes	0.1				0.1
Foreign currency translation	30.1				30.4	(0.3)
Change in fair value of derivative instruments, net of taxes	(33.2)				(33.2)
Compensation expense related to stock option plan grants	4.5		4.5
Common stock issued in: purchase transactions	13.0	$ 0.1	12.9
Common stock issued in: purchase transactions (in shares)		0.1
Stock option plans	15.7	$ 0.3	15.4
Stock option plans (in shares)		0.3
Employee stock purchase plan	10.5	$ 0.1	10.4
Employee stock purchase plan (in shares)		0.1
Deferred compensation and restricted stock	(12.2)	$ (0.1)	(12.1)
Deferred compensation and restricted (in shares)		0.1
Stock issuance from public offering	1,437.9	$ 10.3	1,427.6
Stock issuance from public offering (in shares)		10.3
Other compensation expense	0.3		0.3
Cash dividends declared on common stock	(100.0)			(100.0)
Ending balance at Jun. 30, 2021	$ 8,354.0	$ 206.8	$ 5,887.3	$ 2,749.1	$ (530.5)	$ 41.3
Ending balance, (in shares) at Jun. 30, 2021	206.8	206.8

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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Tax effect on net change in pension asset/liability	$ 0.1	$ 0.2		$ 0.3
Net change in fair value of derivative instruments, tax	$ (10.9)	$ 19.0	$ 0.0	$ (28.9)

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2021

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 or the company, provide insurance 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 companies and entities of all types, including commercial, not-for-profit, public entities, and, to a lesser extent, individuals, in the areas of insurance placement, 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, not-for-profit, captive and public 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.  Clean energy investments consist of our investments in limited liability companies that own 35 commercial clean coal production facilities that can produce refined coal using Chem-Mod LLC’s proprietary technologies.  We believe these operations produce refined coal that qualifies for tax credits under IRC Section 45.  

We do not assume 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.

Investment income and other revenues 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 investment income.

We are headquartered in Rolling Meadows, Illinois, have operations in 56 countries and offer client-service capabilities in more than 150 countries globally through a network of correspondent insurance brokers and consultants.

We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission.  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, 2020, and include all normal recurring adjustments necessary for a fair presentation of the information set forth.  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, 2020.  In the preparation of our unaudited consolidated financial statements as of June 30, 2021, 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 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 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 (including our IRC Section 45 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, 2021

Accounting Changes And Error Corrections [Abstract]

Effect of New Accounting Pronouncements

2.  Effect of New Accounting Pronouncements    

Simplifying the Accounting for Income Taxes

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes,” which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application.  The amendments in ASU 2019-12 are effective for public business entities for fiscal years beginning after December 15, 2020, including interim periods therein.  We adopted this new guidance effective January 1, 2021.  The adoption did not have any impact on our consolidated financial statements.

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Business Combinations

6 Months Ended

Jun. 30, 2021

Business Combinations [Abstract]

Business Combinations

3.  Business Combinations

During the six-month period ended June 30, 2021, we acquired substantially all of the net assets 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)
Atlas General Holdings, LLC
January 1, 2021 (AGH)		—	$	—	$	95.2	$	—	$	5.4	$	8.7	$	109.3	$	35.0
Bollington Wilson Group
February 5, 2021 (BWG)		—		—		328.0		—		1.4		—		329.4		—
LDJ American Online    Benefits Group, LLC       May 1, 2021 (LDJ)		—		—		38.2		—		7.1		14.8		60.1		20.0
Eleven other acquisitions    completed in 2021		152.0		19.4		130.6		0.1		11.8		25.7		187.6		50.5
		152.0	$	19.4	$	592.0	$	0.1	$	25.7	$	49.2	$	686.4	$	105.5

On May 12, 2021, we signed an agreement to acquire certain Willis Towers Watson plc reinsurance, specialty and retail brokerage operations as part of a proposed regulatory remedy for the pending Aon plc and Willis Towers plc combination for net cash consideration of approximately $3.57 billion.  On July 26, 2021, we announced that this agreement had been terminated in conjunction with the announced termination of the Aon plc and Willis Towers Watson plc combination.

On May 17, 2021, we closed on a follow-on public offering of our common stock whereby 10.3 million shares of our stock were issued for net proceeds, after underwriting discounts and other expenses related to this offering, of $1,437.9 million. Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of the offering to fund this acquisition.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as other general corporate purposes.

On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as the 2031 Notes) and the $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 notes).  The weighted average interest rate is 3.31% per annum after giving effect to underwriting costs and the net hedge loss.  Prior to the termination of our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of this offering to fund this transaction.  In conjunction with the termination of this agreement, on July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes (which is described in further detail in Note 7 below).  These notes will be redeemed on August 13, 2021.

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 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. 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 2021 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 7.0% to 10.5% for all of our 2021 acquisitions.  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, 2021 and 2020, we recognized $9.2 million and $7.7  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, 2021 and 2020, we recognized $18.2 million and $18.4 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, 2021 and 2020, we recognized $4.6  million and $8.0  million of expense, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised projections of future performance for 26 and 44 acquisitions, respectively. In addition, during the six-month periods ended June 30, 2021 and 2020, we recognized $10.6  million of expense and $91.6 million of income, respectively, related to net adjustments in the estimated fair value of the liability for earnout obligations in connection with revised projections of future performance for 48 and 102 acquisitions, respectively. The aggregate amount of maximum earnout obligations related to acquisitions was $1,068.1 million as of June 30, 2021, of which $560.1 million was recorded in the consolidated balance sheet as of June 30, 2021, based on the estimated fair value of the expected future payments to be made, of which approximately $536.2 million can be settled in cash or stock at our option and $23.9 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, 2021 (in millions):

							Eleven Other
	AGH		BWG		LDJ		Acquisitions		Total
Cash and restricted cash	$	32.8	$	24.9	$	0.7	$	7.2	$	65.6
Other current assets		112.0		15.2		15.8		36.9		179.9
Fixed assets		7.4		3.8		—		0.1		11.3
Noncurrent assets		1.2		5.3		0.2		5.4		12.1
Goodwill		45.9		223.0		29.1		89.2		387.2
Expiration lists		39.7		109.1		21.3		89.4		259.5
Non-compete agreements		0.3		16.1		0.6		1.2		18.2
Trade names		—		3.2		0.5		0.4		4.1
Total assets acquired		239.3		400.6		68.2		229.8		937.9
Current liabilities		129.8		39.6		8.0		36.4		213.8
Noncurrent liabilities		0.2		31.6		0.1		5.8		37.7
Total liabilities assumed		130.0		71.2		8.1		42.2		251.5
Total net assets acquired	$	109.3	$	329.4	$	60.1	$	187.6	$	686.4

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 in third party claims administration services 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 $387.2 million, $259.5 million, $18.2 million and $4.1 million, respectively, within the brokerage and risk management segments.

Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments.  The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values.  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 3.0% to 4.8% and 4.3% to 16.1%, respectively, for our 2020 acquisitions for which valuations were performed in 2021.  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.  These discount rates generally ranged from 10.0% to 13.5% for our 2020 acquisitions for which valuations were performed in 2021.  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-month periods ended June 30, 2021 and 2020, we wrote off $8.0 million and $0.2 million, respectively, of amortizable assets related to the brokerage and risk management segments.  Based on the results of impairment reviews during the six-month periods ended June 30, 2021 and 2020, we wrote off $13.1  million and $46.0 million, respectively, of amortizable assets related to the brokerage and risk management segments.

Of the $259.5 million of expiration lists, $18.2 million of non-compete agreements and $4.1 million of trade names related to our acquisitions made during the six-month period ended June 30, 2021, $138.6 million, $16.4 million and $3.3 million, respectively, is not expected to be deductible for income tax purposes.  Accordingly, we recorded a deferred tax liability of $26.5 million, and a corresponding amount of goodwill, in the six-month period ended June 30, 2021, related to the nondeductible amortizable intangible assets.  

Our consolidated financial statements for the six-month period ended June 30, 2021 include the operations of the entities acquired in the six-month period ended June 30, 2021 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, 2020 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2021		2020		2021		2020
Total revenues	$	1,936.8	$	1,620.0	$	4,129.4	$	3,527.3
Net earnings attributable to controlling interests		190.6		153.2		575.6		500.2
Basic net earnings per share		0.95		0.80		2.91		2.64
Diluted net earnings per share		0.93		0.79		2.84		2.58

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, 2020, nor are they necessarily indicative of future operating results.  Annualized revenues of entities acquired during the six-month period ended June 30, 2021 totaled approximately $173.8 million.  For the six-month period ended June 30, 2021, total revenues and net earnings recorded in our unaudited consolidated statement of earnings related to our acquisitions made during the six-month period ended June 30, 2021 in the aggregate, were $60.6 million and $2.7 million, respectively.

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Contracts with Customers

6 Months Ended

Jun. 30, 2021

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 2021		December 31, 2020
Unbilled receivables	$	810.8	$	603.1
Deferred contract costs		80.7		102.0
Deferred revenue		592.1		541.3

The unbilled receivables, which are included in premiums and fees 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, 2020	$	354.7		$	186.6		$	541.3
Incremental deferred revenue		256.2			51.1			307.3
Revenue recognized during the six-month period ended    June 30, 2021 included in deferred revenue at December 31, 2020		(226.0	)		(51.4	)		(277.4	)
Net change in collected billings/deposits received from customers		(0.2	)		6.7			6.5
Impact of change in foreign exchange rates		5.5			0.3			5.8
Deferred revenue recognized from business acquisitions		8.6			—			8.6
Deferred revenue at June 30, 2021	$	398.8		$	193.3		$	592.1

Revenue recognized during the six-month period ended June 30, 2021 in the table above included revenue from 2020 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, 2021, the aggregate amount of the contract price allocated to remaining performance obligations was $592.1 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
2021 (remaining six months)	$	323.5	$	105.9	$	429.4
2022		60.0		44.4		104.4
2023		13.1		19.6		32.7
2024		1.1		8.8		9.9
2025		0.6		5.0		5.6
Thereafter		0.5		9.6		10.1
Total	$	398.8	$	193.3	$	592.1

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 $80.7 million and $102.0 million as of June 30, 2021 and December 31, 2020, respectively.  Capitalized fulfillment costs are amortized to expense on the contract effective date.  The amount of amortization of the deferred contract costs was $221.6 million and $208.1 million for the six-month periods ended June 30, 2021 and 2020, 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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Other Financial Data

6 Months Ended

Jun. 30, 2021

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Financial Data

5.  Other Financial Data

Other Current Assets

Major classes of other current assets consist of the following (in millions):

	June 30, 2021		December 31, 2020
Premium finance advances and loans	$	443.3	$	442.7
Accrued supplemental, direct bill and other receivables		375.6		361.7
Refined coal production related receivables		137.8		95.4
Deferred contract costs		80.7		102.0
Prepaid expenses		132.1		112.1
Total other current assets	$	1,169.5	$	1,113.9

The premium finance advances and loans represent short-term loans which we make to many of our brokerage related clients and other non‑brokerage clients to finance their premiums paid to underwriting enterprises.  These premium finance advances and loans are primarily generated by three Australian and New Zealand premium finance subsidiaries.  Financing receivables are carried at amortized cost.  Given that these receivables carry a fairly rapid delinquency period of only seven days post payment date, and that contractually the majority of the underlying insurance policies will be cancelled within one month of the payment due date in normal course, there historically has been a minimal risk of not receiving payment, and therefore we do not maintain any significant allowance for losses against this balance.  

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Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

6.  Intangible Assets

The carrying amount of goodwill at June 30, 2021 and December 31, 2020 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2021
United States	$	3,543.7	$	65.2	$	—	$	3,608.9
United Kingdom		1,602.4		15.6		—		1,618.0
Canada		540.3		—		—		540.3
Australia		468.5		11.5		—		480.0
New Zealand		220.2		10.6		—		230.8
Other foreign		149.4		—		2.9		152.3
Total goodwill	$	6,524.5	$	102.9	$	2.9	$	6,630.3
At December 31, 2020
United States	$	3,399.8	$	33.2	$	—	$	3,433.0
United Kingdom		1,328.3		15.1		—		1,343.4
Canada		492.9		—		—		492.9
Australia		462.1		11.5		—		473.6
New Zealand		221.9		10.7		—		232.6
Other foreign		148.6		—		2.9		151.5
Total goodwill	$	6,053.6	$	70.5	$	2.9	$	6,127.0

The changes in the carrying amount of goodwill for the six-month period ended June 30, 2021 are as follows (in millions):

	Brokerage			Risk Management		Corporate		Total
Balance as of December 31, 2020	$	6,053.6		$	70.5	$	2.9	$	6,127.0
Goodwill acquired during the period		355.2			32.0		—		387.2
Goodwill adjustments due to appraisals and other acquisition adjustments		52.5			—		—		52.5
Goodwill written-off related to sales of business and impairment		(1.0	)		—		—		(1.0	)
Foreign currency translation adjustments during the period		64.2			0.4		—		64.6
Balance as of June 30, 2021	$	6,524.5		$	102.9	$	2.9	$	6,630.3

Major classes of amortizable intangible assets at June 30, 2021 and December 31, 2020 consist of the following (in millions):

	June 30,			December 31,
	2021			2020
Expiration lists	$	5,017.9		$	4,753.2
Accumulated amortization - expiration lists		(2,655.0	)		(2,436.7	)
		2,362.9			2,316.5
Non-compete agreements		88.6			75.9
Accumulated amortization - non-compete agreements		(62.9	)		(57.8	)
		25.7			18.1
Trade names		105.7			107.8
Accumulated amortization - trade names		(47.0	)		(42.5	)
		58.7			65.3
Net amortizable assets	$	2,447.3		$	2,399.9

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

2021 (remaining six months)	$	197.8
2022		376.5
2023		349.5
2024		307.8
2025		267.1
Thereafter		948.6
Total	$	2,447.3

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Credit and Other Debt Agreements

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Credit and Other Debt Agreements

7.  Credit and Other Debt Agreements

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2021			2020
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.50%, balloon due May 20, 2031	$	650.0		$	-
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			—
Total Senior Notes		1,500.0			-
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 5.18%, balloon due February 10, 2021		-			75.0
Semi-annual payments of interest, fixed rate of 3.69%, balloon due June 14, 2022		200.0			200.0
Semi-annual payments of interest, fixed rate of 5.49%, balloon due February 10, 2023		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.13%, balloon due June 24, 2023		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		325.0			325.0
Quarterly payments of interest, floating rate of 90 day LIBOR plus 1.40%, balloon due June 13, 2024		50.0			50.0
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			—
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		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		4,448.0			4,348.0
Credit Agreement:
Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires June 7, 2024		—			—
Premium Financing Debt Facility - expires September 15, 2022:
Facility B
AUD denominated tranche, interbank rates plus 1.400%		147.3			193.1
NZD denominated tranche, interbank rates plus 1.750%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.730%		13.2			—
NZD denominated tranche, interbank rates plus 0.940%		5.6			10.5
Total Premium Financing Debt Facility		166.1			203.6
Total corporate and other debt		6,114.1			4,551.6
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(21.7	)		(7.0	)
Less unamortized discount on Bonds Payable		(14.1	)		—
Net corporate and other debt	$	6,078.3		$	4,544.6

On May 20, 2021, we closed and funded an offering of $1,500.0 million of unsecured senior notes in two tranches.  The $650.0 million aggregate principal amount of 2.50% Senior Notes are due 2031 (which we refer to as the 2031 Notes) and the $850.0 million aggregate principal amount of 3.50% Senior Notes are due 2051 (which we refer to as the 2051 Notes and together with the 2031 Notes, the “Notes”).  The weighted average interest rate is 3.31% per annum after giving effect to underwriting costs and the net hedge loss.  In 2018 and 2019, we entered into a pre-issuance interest rate hedging transaction related to these notes.  We realized a net cash loss of approximately $57.8 million on the hedging transactions that will be recognized on a pro rata basis as an increase to our reported interest expense over a ten year period.  Prior to the termination our agreement to acquire certain Willis Towers Watson plc brokerage operations, our intent was to use the net proceeds of this offering to fund a portion of the cash consideration payable in connection with this transaction.  We are evaluating opportunities to deploy these funds, which may include share repurchases and other acquisitions, as well as general corporate purposes. The offering of the Notes was made pursuant to a shelf registration statement filed with the SEC.  

The 2031 Notes have a special optional redemption whereby we may, at our option, redeem the 2031 Notes, in whole and not in part, by providing notice of such redemption to the holders of the 2031 Notes within 30 days following a Willis Tower Watson plc transaction termination event, at a redemption price equal to 101% of the aggregate principal amount of the 2031 Notes, plus any accrued and unpaid interest.  In conjunction with the termination of this agreement, on July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes. These notes will be redeemed on August 13, 2021.  The impact of the extinguishment of this debt, which includes the redemption price premium, the unamortized discount amount on the debt issuance and the write-off of all the debt acquisition costs, is estimated to be an after-tax loss of $12.0 million to $14.0 million that will be recognized in third quarter 2021.  The 2051 Notes are not subject to the special optional redemption.

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Earnings Per Share

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Earnings Per Share

8.  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,
	2021		2020		2021		2020
Net earnings attributable to controlling interests	$	190.2	$	153.7	$	572.3	$	500.0
Weighted average number of common shares outstanding		201.3		190.5		198.0		189.6
Dilutive effect of stock options using the treasury    stock method		4.5		3.6		4.5		4.0
Weighted average number of common and common    equivalent shares outstanding		205.8		194.1		202.5		193.6
Basic net earnings per share	$	0.94	$	0.81	$	2.89	$	2.64
Diluted net earnings per share	$	0.92	$	0.79	$	2.83	$	2.58

Anti-dilutive stock-based awards of 1.6 million shares were outstanding at June 30, 2021 and 2020 that 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 1.0 million shares were outstanding at June 30, 2021 and 2020 that 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, 2021

Text Block [Abstract]

Stock Option Plans

9.  Stock Option Plans

On May 16, 2017, our stockholders approved the Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2014 Long-Term Incentive Plan (which we refer to as the 2014 LTIP).  The LTIP term began May 16, 2017 and terminates on the date of the annual meeting of stockholders in 2027, 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. 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) is 1.8 million at June 30, 2021.  

The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non-qualified 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 16, 2021, the compensation committee granted 1,640,000 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 2024, 2025 and 2026, respectively.  On March 12, 2020, the compensation committee granted 1,590,740 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 2023, 2024 and 2025, respectively.  The 2021 and 2020 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment.  For our executive officers age 55 or older, stock options are not subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.

During the three-month periods ended June 30, 2021 and 2020, we recognized $4.5 million and $3.3 million, respectively, of compensation expense related to our stock option grants. During the six-month periods ended June 30, 2021 and 2020, we recognized $8.2 million and $6.7 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:

	2021			2020
Expected dividend yield		1.5	%		2.1	%
Expected risk-free interest rate		0.9	%		0.7	%
Volatility		22.9	%		17.3	%
Expected life (in years)		5.4			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-months periods ended June 30, 2021 and 2020, as determined on the grant date using the Black-Scholes option pricing model, was $23.38 and $9.99, respectively.

The following is a summary of our stock option activity and related information for 2021 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2021
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.5		$	65.09
Granted		1.6			127.90
Exercised		(0.9	)		49.43
Forfeited or canceled		(0.1	)		84.41
Ending balance		8.1		$	79.59		4.26	$	488.4
Exercisable at end of period		2.5		$	50.83		2.00	$	222.2
Ending unvested and expected to vest		5.1		$	91.44		5.21	$	250.3

Options with respect to 9.4 million shares (less any shares of restricted stock issued under the LTIP - see Note 11 to these unaudited consolidated financial statements) were available for grant under the LTIP at June 30, 2021.

The total intrinsic value of options exercised during the six-month periods ended June 30, 2021 and 2020 was $78.1 million and $47.1 million, respectively.  As of June 30, 2021, we had approximately $57.6 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, 2021 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
$	43.71	—	$	43.71		1.0	$	1.71	$	43.71		1.0	$	43.71
	46.17	—		46.17		0.5		0.70		46.17		0.5		46.17
	49.55	—		56.86		1.1		2.71		56.83		0.7		56.84
	70.74			70.74		1.1		3.71		70.74		0.3		70.74
	79.59	—		79.59		1.2		4.71		79.59		—		79.59
	86.17	—		86.17		1.6		5.70		86.17		—		86.17
	127.90	—		127.90		1.6		6.72		127.90		—		—
$	43.71	—	$	127.90		8.1		4.26	$	79.59		2.5	$	50.83

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Deferred Compensation

6 Months Ended

Jun. 30, 2021

Compensation Related Costs [Abstract]

Deferred Compensation

10.  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 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 consolidated financial statements.  

In the first quarters of 2021 and 2020, the compensation committee approved $17.0 million and $14.1 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 2021 and 2020, 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 2021 and 2020 awards.  During the three-month periods ended June 30, 2021 and 2020, we charged $3.8 million and $3.7 million, respectively, to compensation expense related to these awards. During the six‑month periods ended June 30, 2021 and 2020, we charged $6.5 million and $6.0 million, respectively, to compensation expense related to these awards.

In the first quarters of 2021 and 2020, the compensation committee approved $3.2 million and $1.8 million, respectively, of awards under the sub-plans referred to above, which were contributed to the rabbi trust in the first quarters of 2021 and 2020, respectively.  During the three-month periods ended June 30, 2021 and 2020, we charged $0.7 million to compensation expense related to these awards.  During the six-month periods ended June 30, 2021 and 2020, we charged $1.4 million to compensation expense related to these awards.  There were no distributions from the sub-plans during the six-month periods ended June 30, 2021 and 2020.

At June 30, 2021 and December 31, 2020, we recorded $78.9 million (related to 2.7 million shares) and $60.5 million (related to 2.6 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, 2021 and December 31, 2020 was $383.3 million and $327.8 million, respectively.  During the six-month period ended June 30, 2021, cash and equity awards with an aggregate fair value of $4.8 million were vested and distributed to executives under the DEPP.  During the six-month period ended June 30, 2020, cash and equity awards with an aggregate fair value of $9.8 million 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 2021 and 2020, the compensation committee approved $7.2 million and $3.0 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in the second quarters of 2021 and 2020, respectively.  During the three-month periods ended June 30, 2021 and 2020, we charged $2.1 million and $1.7 million, respectively, to compensation expense related to these awards. During the six-month periods ended June 30, 2021 and 2020, we charged $4.1 million and $3.4 million, respectively, to compensation expense related to these awards.  There were $6.7 million and $7.3 million of distributions from the DCPP during the six-month periods ended June 30, 2021 and 2020, respectively.

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Restricted Stock, Performance Share and Cash Awards

6 Months Ended

Jun. 30, 2021

Text Block [Abstract]

Restricted Stock, Performance Share and Cash Awards

11.  Restricted Stock, Performance Share and Cash Awards

Restricted Stock Awards

As discussed in Note 9 to these unaudited consolidated financial statements, on May 16, 2017, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2014 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, 2021, 1.8 million shares were available for grant under the LTIP for such awards.

In the first quarters of 2021 and 2020, we granted 314,000 and 405,900 restricted stock units, respectively, to employees under the LTIP, with an aggregate fair value of $40.1 million and $34.9 million, respectively, at the date of grant.  These 2021 and 2020 awards of restricted stock units vest in full based on continued employment through March 16, 2026 and March 12, 2025, respectively. For our executive officers age 55 or older, restricted stock units are not subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.  

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 value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements.  During the three‑month periods ended June 30, 2021 and 2020, we recognized $7.6 million and $6.6 million, respectively, to compensation expense related to restricted stock unit awards granted in 2015 through 2021. During the six-month periods ended June 30, 2021 and 2020, we recognized $13.5 million and $11.5 million, respectively, to compensation expense related to restricted stock unit awards granted in 2015 through 2021.  The total intrinsic value of unvested restricted stock units at June 30, 2021 and 2020 was $269.7 million and $207.4 million, respectively. During the three-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate value of $1.3 million and $0.8 million, respectively, were vested and distributed to employees under this plan. During the six-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate value of $48.1 million and $30.6 million, respectively, were vested and distributed to employees under this plan.    

Performance Share Awards

On March 16, 2021 and March 12, 2020, pursuant to the LTIP, the compensation committee approved 67,000 and 82,500, respectively, of provisional performance share awards, with an aggregate fair value of $8.6 million and $7.1 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 2021 Proxy Statement). Earned shares for the 2021 and 2020 provisional awards will fully vest based on continuous employment through March 16, 2024 and March 12, 2023, respectively, and will be settled in unrestricted shares of our common stock on a one-for-one basis as soon as practicable thereafter.  The 2021 and 2020 awards are subject to a three-year performance period that began on January 1, 2021 and 2020, respectively, and vest on the three-year anniversary of the date of grant (March 16, 2024 and March 12, 2023). For certain of our executive officers age 55 or older, awards are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of grant.  During the three-month periods ended June 30, 2021 and 2020, we recognized $3.2 million and $2.4 million, respectively, to compensation expense related to performance share awards granted in 2017 through 2021.  During the six-month periods ended June 30, 2021 and 2020, we recognized $6.2 million and $8.5 million, respectively, to compensation expense related to performance share awards granted in 2017 through 2021.  The total intrinsic value of unvested performance share awards at June 30, 2021 and 2020 was $55.0 million and $28.6 million, respectively.  During the six-month periods ended June 30, 2021 and 2020, equity awards (including accrued dividends) with an aggregate fair value of $19.1 million and $12.5 million, respectively, were vested and distributed to employees under this plan.

Cash Awards

On March 16, 2021, pursuant to our Performance Unit Program (which we refer to as 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.  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 EBITAC 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 for the 2021 provisional award will fully vest based on continuous employment through January 1, 2024.  The ultimate award value will be equal to the trailing twelve-month price of our common stock on December 31, 2023, 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 in 2024.  If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited.  We did not recognize any compensation expense during the six-month period ended June 30, 2021 related to the 2021 provisional award under the Program.  

On March 12, 2020, pursuant to the Program, the compensation committee approved provisional cash awards of $18.4 million in the aggregate for future grants to our officers and key employees that are denominated in units (213,000 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.  Terms of the 2020 provisional awards were similar to the terms of the 2021 provisional awards.  Based on our performance for 2020, we granted 208,000 units under the Program in the first quarter of 2021 that will fully vest on January 1, 2023.  During the three and six-month periods ended June 30, 2021, we recognized $2.3 million and $5.2 million, respectively, to compensation expense related to these awards. 

On March 14, 2019, pursuant to the Program, the compensation committee approved provisional cash awards of $16.5 million in the aggregate for future grants to our officers and key employees that are denominated in units (206,800 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.  Terms of the 2019 provisional awards were similar to the terms of the 2020 provisional awards.  Based on our performance for 2019, we granted 200,000 units under the Program in the first quarter of 2020 that will fully vest on January 1, 2022.  During the three-month periods ended June 30, 2021 and 2020, we recognized $1.9 million and $1.9 million to compensation expense related to these awards, respectively.  During the six-month periods ended June 30, 2021 and 2020, we recognized $5.1 million and $4.1 million, respectively, to compensation expense related to these awards,

On March 15, 2018, pursuant to the Program, the compensation committee approved provisional cash awards of $15.0 million in the aggregate for future grants to our officers and key employees denominated in units (219,000 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.  Terms of the 2018 provisional awards were similar to the terms of the 2019 provisional awards.  Based on our performance, we granted 190,000 units under the Program in the first quarter of 2019 that fully vested on January 1, 2021.  During the three and six-month periods ended June 30, 2020, we recognized $0.9 million and $3.5 million, respectively, to compensation expense related to these awards.  

During the six-month period ended June 30, 2021, cash awards related to the 2018 provisional award with an aggregate fair value of $17.7 million (176,300 units in the aggregate) were vested and distributed to employees under the Program.  During the six-month period ended June 30, 2020, cash awards related to the 2017 provisional award with an aggregate fair value of $18.9 million (221,600 units in the aggregate) were vested and distributed to employees under the Program.    

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Investments

6 Months Ended

Jun. 30, 2021

Equity Method Investments And Joint Ventures [Abstract]

Investments

12.  Investments

The following is a summary of our investments included in other noncurrent assets in the consolidated balance sheet and the related funding commitments (in millions):

	June 30, 2021				December 31, 2020
			Funding
	Assets		Commitments		Assets
Chem-Mod LLC	$	4.0	$	—	$	4.0
Chem-Mod International LLC		2.0		—		2.0
Clean-coal investments:
Non-controlling interest in a limited liability company that owns one    2011 Era Clean Coal Plant		0.1		—		0.1
Controlling interest in limited liability companies that own twenty    2011 Era Clean Coal Plants		6.1		—		12.4
Other investments		4.9		1.0		3.9
Total investments	$	17.1	$	1.0	$	22.4

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Derivatives and Hedging Activity

6 Months Ended

Jun. 30, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activity

13.  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, 2021.

The notional and fair values of derivatives designated as hedging instruments are as follows at June 30, 2021 and December 31, 2020 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2021
Interest rate contracts	$	1,000.0	Other current assets	$	4.2	Accrued compensation and other current liabilities	$	2.0
			Other noncurrent assets		4.1	Other noncurrent liabilities		8.2
Foreign exchange contracts (1)		26.5	Other current assets		6.6	Accrued compensation and other current liabilities		0.5
			Other noncurrent assets		3.8	Other noncurrent liabilities		3.6
Total	$	1,026.5		$	18.7		$	14.3
At December 31, 2020
Interest rate contracts	$	550.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	54.5
			Other noncurrent assets		—	Other noncurrent liabilities		10.9
Foreign exchange contracts (1)		48.6	Other current assets		5.9	Accrued compensation and other current liabilities		0.6
			Other noncurrent assets		7.8	Other noncurrent liabilities		3.3
Total	$	598.6		$	13.7		$	69.3

(1) Included within foreign exchange contracts at June 30, 2021 were $408.3 million of call options, offset with $408.3 million of put options, and $13.7 million of buy forwards, offset with $40.2 million of sell forwards.  Included within foreign exchange contracts at December 31, 2020 were $354.7 million of call options offset, with $354.7 million of put options, and $9.0 million of buy forwards, offset with $57.6 million of sell forwards.

The effect of cash flow hedge accounting on accumulated other comprehensive loss for the three and six-month periods ended June 30, 2021 and 2020 were as follows (in millions):

							Amount of
				Amount of			Gain (Loss)
				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, 2021
Interest rate contracts	$	(41.7	)	$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		(4.4	)		(1.4	)		(0.1	)	Commission revenue
					(0.2	)		0.2		Compensation expense
					(0.1	)		0.2		Operating expense
Total	$	(46.1	)	$	(2.0	)	$	0.3
Three-month period ended June 30, 2020
Interest rate contracts	$	6.1		$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		2.0			(0.1	)		(0.1	)	Commission revenue
					(0.5	)		0.4		Compensation expense
					(0.4	)		0.2		Operating expense
Total	$	8.1		$	(1.3	)	$	0.5
Six-month period ended June 30, 2021
Interest rate contracts	$	34.1		$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(6.1	)		(2.3	)		(0.2	)	Commission revenue
					(0.5	)		0.6		Compensation expense
					(0.3	)		0.5		Operating expense
Total	$	28.0		$	(3.7	)	$	0.9
Six-month period ended June 30, 2020
Interest rate contracts	$	(108.1	)	$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(17.3	)		(0.5	)		(0.3	)	Commission revenue
					(0.8	)		0.6		Compensation expense
					(0.6	)		0.4		Operating expense
Total	$	(125.4	)	$	(2.5	)	$	0.7

(1) For the three and six-month periods ended June 30, 2021 and 2020, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of zero and $1.2 million, respectively.  

We estimate that approximately $5.7 million of pretax loss 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, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments, Contingencies and Off-Balance Sheet Arrangements

14.  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, 2021 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2021			2022			2023			2024			2025			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	1,500.0		$	1,500.0
Note purchase agreements		—			200.0			250.0			475.0			200.0			3,323.0			4,448.0
Credit Agreement		—			—			—			—			—			—			—
Premium Financing Debt Facility		166.1			—			—			—			—			—			166.1
Interest on debt		119.1			234.0			224.9			208.3			193.6			1,496.3			2,476.2
Total debt obligations		285.2			434.0			474.9			683.3			393.6			6,319.3			8,590.3
Operating lease obligations		52.9			101.8			81.8			59.7			45.3			87.6			429.1
Less sublease arrangements		(0.1	)		(0.3	)		(0.3	)		(0.3	)		(0.2	)		(0.5	)		(1.7	)
Outstanding purchase obligations		57.0			60.1			40.0			29.4			21.7			33.0			241.2
Total contractual obligations	$	395.0		$	595.6		$	596.4		$	772.1		$	460.4		$	6,439.4		$	9,258.9

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 7 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.  On July 29, 2021, we exercised the special option redemption feature for the 2031 Senior Notes (which is described in further detail in Note 7).  These notes will be redeemed on August 13, 2021.

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 and will accommodate approximately 2,000 employees at peak pre-pandemic capacity.

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 - We typically do not have a material amount of outstanding purchase obligations at any point in time.  The amount disclosed in the contractual obligations table above represents the aggregate amount of unrecorded purchase obligations that we had outstanding at June 30, 2021. 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, 2021 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2021		2022		2023		2024		2025		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	15.2	$	15.2
Financial guarantees		0.1		0.2		0.2		0.2		0.2		0.2		1.1
Funding commitments		1.0		—		—		—		—		—		1.0
Total commitments	$	1.1	$	0.2	$	0.2	$	0.2	$	0.2	$	15.4	$	17.3

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 597 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 2017 to 2021 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 $1,068.1 million, of which $560.1 million was recorded in our consolidated balance sheet as of June 30, 2021 based on the estimated fair value of the expected future payments to be made, of which approximately $536.2 million can be settled in cash or stock at our option and $23.9 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, 2021 or December 31, 2020, that was recourse to us.

At June 30, 2021, we had posted two letters of credit totaling $9.4 million, in the aggregate, related to our self‑insurance deductibles, for which we had a recorded liability of $18.0 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, 2021, we had posted six letters of credit totaling $4.3 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 $1.0 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 are a defendant in various legal actions incidental to the nature of our business including but not limited to matters related to employment practices, alleged breaches of non‑compete or other restrictive covenants, theft of trade secrets, breaches of fiduciary duties and related causes of action.  We are also periodically the subject of inquiries, investigations and reviews by regulatory and taxing authorities into various matters related to our business, including our operational, compliance and finance functions.  Neither the outcomes of these matters nor their effect upon our business, financial condition or results of operations can be determined at this time.

On July 17, 2019, Midwest Energy Emissions Corp. and MES Inc. (which we refer to together as Midwest Energy) filed a patent infringement lawsuit in the United States District Court for the District of Delaware against us, Chem‑Mod LLC and numerous other related and unrelated parties.  The complaint alleges that the named defendants’ infringe patents held exclusively by Midwest Energy and seeks unspecified damages and injunctive relief.  On May 20, 2021, the court issued a ruling on our motion to dismiss the plaintiffs’ second amended complaint.  The court granted in part and denied in part the relief we sought in our motion.  We continue to defend this matter vigorously.  Litigation is inherently uncertain and it is not possible for us to predict the ultimate outcome of this matter and the financial impact to us.  We believe the probability of a material loss is remote.

As previously disclosed, our IRC 831(b) (or “micro-captive”) advisory services businesses has been under investigation by the IRS since 2013. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promotor in connection with these operations.  Additionally, the IRS has initiated audits for the 2012 tax year, and subsequent tax years, of over 100 of the micro-captive underwriting enterprises organized and/or managed by us.

In May 2020, we learned that the Department of Justice (DOJ) began conducting a criminal investigation related to IRC 831(b) micro-captive underwriting enterprises. We have been advised that we are not currently a target of the investigation. In June 2020 our subsidiary Artex Risk Solutions, Inc. (which we refer to as Artex) received a grand jury subpoena requesting documents relating to its micro‑captive advisory business. We have produced documents in response to the subpoena.  We are fully cooperating with both the IRS investigation and the DOJ investigation. We are not able to reasonably estimate the amount of any potential loss in connection with these investigations.

On December 7, 2018, a class action lawsuit was filed against us, Artex and other defendants, in the United States District Court for the District of Arizona. The named plaintiffs were micro-captives and related entities and owners who had IRC Section 831(b) tax benefits disallowed by the IRS. The complaint alleged that the defendants defrauded the plaintiffs by marketing and managing micro-captives with the knowledge that the captives did not constitute bona fide insurance and thus would not qualify for tax benefits.  On August 5, 2019, the trial court granted the defendants’ motion to compel arbitration and dismissed the class action lawsuit.  Plaintiffs appealed this ruling to the United States Court of Appeals for the Ninth Circuit.  On September 9, 2020, the Ninth Circuit Court affirmed the ruling of the trial court dismissing the class action lawsuit.  On March 17, 2021, plaintiffs filed a petition for writ of certiorari with the United States Supreme Court.  On June 28, 2021, the United States Supreme Court denied the plaintiffs’ petition for a writ of certiorari.  This ruling concluded the class action lawsuit in our favor.

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 $10.0 million of every E&O claim up to $10.0 million.  In addition, we retain, in aggregate: up to another $4.5 million between $10.0 million and $100.0 million, plus up to another $20.0 million between $100.0 million and $240.0 million, and up to another $27.0 million between $240.0 million and $350.0 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, 2021 consolidated balance sheet is above the lower end of the most recently determined actuarial range by $3.1 million and below the upper end of the actuarial range by $7.2 million.  In addition to this E&O reserve, in the six-month period ended June 30, 2021, we established provisions for potential unusual pandemic related claim defense and other costs.  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, 2021, we had exposure on $108.0 million of previously earned tax credits.  Under the TCJA, 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, 2021 consolidated balance sheet related to this exposure.

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Supplemental Disclosures of Cash Flow Information

6 Months Ended

Jun. 30, 2021

Cash And Cash Equivalents [Abstract]

Supplemental Disclosures of Cash Flow Information

15.  Supplemental Disclosures of Cash Flow Information

	Six-month period ended June 30,
Supplemental disclosures of cash flow information (in millions):	2021		2020
Interest paid	$	95.8	$	91.7
Income taxes paid, net		115.3		20.0

The following is a reconciliation of our end of period cash, cash equivalents and restricted cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2021 and 2020 (in millions):

	June 30,
	2021		2020
Cash and cash equivalents	$	3,204.1	$	349.7
Restricted cash		3,170.9		2,653.0
Total cash, cash equivalents and restricted cash	$	6,375.0	$	3,002.7

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) $34.5 million and $30.3  million related to the plan in the six-month periods ended June 30, 2021 and 2020, respectively.  Our board of directors authorized the use of common stock to fund our 2020 employer matching contributions to the 401(k) plan, which we funded in February 2021.  During second quarter 2021, our board of directors authorized a 5.0% employer match on eligible compensation to the 401(k) plan for the 2021 plan year and the possible use of common stock to fund our 2021 employer matching contributions, which is expected to be funded in February 2022.

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Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Accumulated Other Comprehensive Loss

16.  Accumulated Other Comprehensive Loss

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

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2020	$	(56.1	)	$	(491.1	)	$	(96.4	)	$	(643.6	)
Net change in period		1.1			88.4			23.6			113.1
Balance as of June 30, 2021	$	(55.0	)	$	(402.7	)	$	(72.8	)	$	(530.5	)

The foreign currency translation during the six-month period ended June 30, 2021 primarily 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 U.K., Australia, Canada, New Zealand, the Caribbean, India and other non-U.S. locations.  

During the six-month periods ended June 30, 2021 and 2020, $2.9 million and $3.1 million, respectively, of expense 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, 2021 and 2020, $3.7 million and $2.5 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, 2021 and 2020, 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, 2021

Segment Reporting [Abstract]

Segment Information

17.  Segment Information

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

The brokerage segment is primarily comprised of our retail and wholesale insurance brokerage operations.  The brokerage segment 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 enterprises and public entities 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 translation.  

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 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, 2021 and 2020 is as follows (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Brokerage
Total revenues	$	1,390.2		$	1,201.1		$	3,000.4		$	2,636.7
Earnings before income taxes	$	299.7		$	247.8		$	780.0		$	658.6
Identifiable assets at June 30, 2021 and 2020							$	21,858.6		$	18,405.6
Risk Management
Total revenues	$	281.7		$	223.2		$	534.4		$	472.7
Earnings before income taxes	$	33.4		$	13.2		$	57.5		$	38.8
Identifiable assets at June 30, 2021 and 2020							$	1,058.5		$	929.1
Corporate
Total revenues	$	261.6		$	159.7		$	563.7		$	341.5
Loss before income taxes	$	(110.8	)	$	(89.3	)	$	(206.8	)	$	(169.7	)
Identifiable assets at June 30, 2021 and 2020							$	4,900.1		$	1,971.5
Total
Total revenues	$	1,933.5		$	1,584.0		$	4,098.5		$	3,450.9
Earnings before income taxes	$	222.3		$	171.7		$	630.7		$	527.7
Identifiable assets at June 30, 2021 and 2020							$	27,817.2		$	21,306.2

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, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	977.1	$	—	$	—	$	977.1
Fees		296.0		244.9		—		540.9
Supplemental revenues		55.2		—		—		55.2
Contingent revenues		43.3		—		—		43.3
Investment income		18.1		—		—		18.1
Net gains on divestitures		0.5		0.1		—		0.6
Revenues from clean coal activities		—		—		261.0		261.0
Other net revenues		—		—		0.6		0.6
Revenues before reimbursements		1,390.2		245.0		261.6		1,896.8
Reimbursements		—		36.7		—		36.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

Revenues by type and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	2,102.5	$	—	$	—	$	2,102.5
Fees		629.6		465.1		—		1,094.7
Supplemental revenues		122.0		—		—		122.0
Contingent revenues		106.6		—		—		106.6
Investment income		35.1		0.1		—		35.2
Net gains on divestitures		4.6		0.1		—		4.7
Revenues from clean coal activities		—		—		561.6		561.6
Other net revenues		—		—		2.1		2.1
Revenues before reimbursements		3,000.4		465.3		563.7		4,029.4
Reimbursements		—		69.1		—		69.1
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

Revenues by geographical location and segment for the three-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	812.4	$	231.5	$	261.6	$	1,305.5
United Kingdom		326.1		11.8		—		337.9
Australia		70.7		33.0		—		103.7
Canada		79.9		1.4		—		81.3
New Zealand		45.4		4.0		—		49.4
Other foreign		55.7		—		—		55.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

Revenues by geographical location and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,919.0	$	439.0	$	563.7	$	2,921.7
United Kingdom		618.5		22.9		—		641.4
Australia		124.7		62.0		—		186.7
Canada		147.4		2.8		—		150.2
New Zealand		77.9		7.7		—		85.6
Other foreign		112.9		—		—		112.9
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

Revenues by type and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	827.5	$	—	$	—	$	827.5
Fees		269.1		190.6		—		459.7
Supplemental revenues		50.3		—		—		50.3
Contingent revenues		37.4		—		—		37.4
Investment income		15.8		0.2		—		16.0
Net gains on divestitures		1.0		—		—		1.0
Revenues from clean coal activities		—		—		159.5		159.5
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		1,201.1		190.8		159.7		1,551.6
Reimbursements		—		32.4		—		32.4
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

Revenues by type and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,844.7	$	—	$	—	$	1,844.7
Fees		564.9		402.1		—		967.0
Supplemental revenues		109.3		—		—		109.3
Contingent revenues		82.5		—		—		82.5
Investment income		34.1		0.5		—		34.6
Net gains on divestitures		1.2		—		—		1.2
Revenues from clean coal activities		—		—		341.3		341.3
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		2,636.7		402.6		341.5		3,380.8
Reimbursements		—		70.1		—		70.1
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

Revenues by geographical location and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	740.8	$	185.6	$	159.7	$	1,086.1
United Kingdom		260.9		8.2		—		269.1
Australia		56.9		24.7		—		81.6
Canada		58.2		1.5		—		59.7
New Zealand		38.0		3.2		—		41.2
Other foreign		46.3		—		—		46.3
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

Revenues by geographical location and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,746.7	$	398.3	$	341.5	$	2,486.5
United Kingdom		515.4		19.6		—		535.0
Australia		100.0		46.3		—		146.3
Canada		114.4		2.5		—		116.9
New Zealand		66.0		6.0		—		72.0
Other foreign		94.2		—		—		94.2
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

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 or the company, provide insurance 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 companies and entities of all types, including commercial, not-for-profit, public entities, and, to a lesser extent, individuals, in the areas of insurance placement, 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, not-for-profit, captive and public 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.  Clean energy investments consist of our investments in limited liability companies that own 35 commercial clean coal production facilities that can produce refined coal using Chem-Mod LLC’s proprietary technologies.  We believe these operations produce refined coal that qualifies for tax credits under IRC Section 45.  

We do not assume 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.

Investment income and other revenues 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 investment income.

We are headquartered in Rolling Meadows, Illinois, have operations in 56 countries and offer client-service capabilities in more than 150 countries globally through a network of correspondent insurance brokers and consultants.

We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission.  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, 2020, and include all normal recurring adjustments necessary for a fair presentation of the information set forth.  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, 2020.  In the preparation of our unaudited consolidated financial statements as of June 30, 2021, 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 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 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 (including our IRC Section 45 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, 2021

Business Combinations [Abstract]

Acquisition Method for Recording Business Combinations

During the six-month period ended June 30, 2021, we acquired substantially all of the net assets 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)
Atlas General Holdings, LLC
January 1, 2021 (AGH)		—	$	—	$	95.2	$	—	$	5.4	$	8.7	$	109.3	$	35.0
Bollington Wilson Group
February 5, 2021 (BWG)		—		—		328.0		—		1.4		—		329.4		—
LDJ American Online    Benefits Group, LLC       May 1, 2021 (LDJ)		—		—		38.2		—		7.1		14.8		60.1		20.0
Eleven other acquisitions    completed in 2021		152.0		19.4		130.6		0.1		11.8		25.7		187.6		50.5
		152.0	$	19.4	$	592.0	$	0.1	$	25.7	$	49.2	$	686.4	$	105.5

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, 2021 (in millions):

							Eleven Other
	AGH		BWG		LDJ		Acquisitions		Total
Cash and restricted cash	$	32.8	$	24.9	$	0.7	$	7.2	$	65.6
Other current assets		112.0		15.2		15.8		36.9		179.9
Fixed assets		7.4		3.8		—		0.1		11.3
Noncurrent assets		1.2		5.3		0.2		5.4		12.1
Goodwill		45.9		223.0		29.1		89.2		387.2
Expiration lists		39.7		109.1		21.3		89.4		259.5
Non-compete agreements		0.3		16.1		0.6		1.2		18.2
Trade names		—		3.2		0.5		0.4		4.1
Total assets acquired		239.3		400.6		68.2		229.8		937.9
Current liabilities		129.8		39.6		8.0		36.4		213.8
Noncurrent liabilities		0.2		31.6		0.1		5.8		37.7
Total liabilities assumed		130.0		71.2		8.1		42.2		251.5
Total net assets acquired	$	109.3	$	329.4	$	60.1	$	187.6	$	686.4

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, 2020 (in millions, except per share data):

	Three-month period ended				Six-month period ended
	June 30,				June 30,
	2021		2020		2021		2020
Total revenues	$	1,936.8	$	1,620.0	$	4,129.4	$	3,527.3
Net earnings attributable to controlling interests		190.6		153.2		575.6		500.2
Basic net earnings per share		0.95		0.80		2.91		2.64
Diluted net earnings per share		0.93		0.79		2.84		2.58

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Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2021

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 2021		December 31, 2020
Unbilled receivables	$	810.8	$	603.1
Deferred contract costs		80.7		102.0
Deferred revenue		592.1		541.3

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, 2020	$	354.7		$	186.6		$	541.3
Incremental deferred revenue		256.2			51.1			307.3
Revenue recognized during the six-month period ended    June 30, 2021 included in deferred revenue at December 31, 2020		(226.0	)		(51.4	)		(277.4	)
Net change in collected billings/deposits received from customers		(0.2	)		6.7			6.5
Impact of change in foreign exchange rates		5.5			0.3			5.8
Deferred revenue recognized from business acquisitions		8.6			—			8.6
Deferred revenue at June 30, 2021	$	398.8		$	193.3		$	592.1

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
2021 (remaining six months)	$	323.5	$	105.9	$	429.4
2022		60.0		44.4		104.4
2023		13.1		19.6		32.7
2024		1.1		8.8		9.9
2025		0.6		5.0		5.6
Thereafter		0.5		9.6		10.1
Total	$	398.8	$	193.3	$	592.1

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Other Financial Data (Tables)

6 Months Ended

Jun. 30, 2021

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Summary of Major Classes of Other Current Assets

Major classes of other current assets consist of the following (in millions):

	June 30, 2021		December 31, 2020
Premium finance advances and loans	$	443.3	$	442.7
Accrued supplemental, direct bill and other receivables		375.6		361.7
Refined coal production related receivables		137.8		95.4
Deferred contract costs		80.7		102.0
Prepaid expenses		132.1		112.1
Total other current assets	$	1,169.5	$	1,113.9

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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations

The carrying amount of goodwill at June 30, 2021 and December 31, 2020 allocated by domestic and foreign operations is as follows (in millions):

	Brokerage		Risk Management		Corporate		Total
At June 30, 2021
United States	$	3,543.7	$	65.2	$	—	$	3,608.9
United Kingdom		1,602.4		15.6		—		1,618.0
Canada		540.3		—		—		540.3
Australia		468.5		11.5		—		480.0
New Zealand		220.2		10.6		—		230.8
Other foreign		149.4		—		2.9		152.3
Total goodwill	$	6,524.5	$	102.9	$	2.9	$	6,630.3
At December 31, 2020
United States	$	3,399.8	$	33.2	$	—	$	3,433.0
United Kingdom		1,328.3		15.1		—		1,343.4
Canada		492.9		—		—		492.9
Australia		462.1		11.5		—		473.6
New Zealand		221.9		10.7		—		232.6
Other foreign		148.6		—		2.9		151.5
Total goodwill	$	6,053.6	$	70.5	$	2.9	$	6,127.0

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the six-month period ended June 30, 2021 are as follows (in millions):

	Brokerage			Risk Management		Corporate		Total
Balance as of December 31, 2020	$	6,053.6		$	70.5	$	2.9	$	6,127.0
Goodwill acquired during the period		355.2			32.0		—		387.2
Goodwill adjustments due to appraisals and other acquisition adjustments		52.5			—		—		52.5
Goodwill written-off related to sales of business and impairment		(1.0	)		—		—		(1.0	)
Foreign currency translation adjustments during the period		64.2			0.4		—		64.6
Balance as of June 30, 2021	$	6,524.5		$	102.9	$	2.9	$	6,630.3

Major Classes of Amortizable Intangible Assets

Major classes of amortizable intangible assets at June 30, 2021 and December 31, 2020 consist of the following (in millions):

	June 30,			December 31,
	2021			2020
Expiration lists	$	5,017.9		$	4,753.2
Accumulated amortization - expiration lists		(2,655.0	)		(2,436.7	)
		2,362.9			2,316.5
Non-compete agreements		88.6			75.9
Accumulated amortization - non-compete agreements		(62.9	)		(57.8	)
		25.7			18.1
Trade names		105.7			107.8
Accumulated amortization - trade names		(47.0	)		(42.5	)
		58.7			65.3
Net amortizable assets	$	2,447.3		$	2,399.9

Estimated Aggregate Amortization Expense

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

2021 (remaining six months)	$	197.8
2022		376.5
2023		349.5
2024		307.8
2025		267.1
Thereafter		948.6
Total	$	2,447.3

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Credit and Other Debt Agreements (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Summary of Corporate and Other Debt

7.  Credit and Other Debt Agreements

The following is a summary of our corporate and other debt (in millions):	June 30,			December 31,
	2021			2020
Senior Notes:
Semi-annual payments of interest, fixed rate of 2.50%, balloon due May 20, 2031	$	650.0		$	-
Semi-annual payments of interest, fixed rate of 3.50%, balloon due May 20, 2051		850.0			—
Total Senior Notes		1,500.0			-
Note Purchase Agreements:
Semi-annual payments of interest, fixed rate of 5.18%, balloon due February 10, 2021		-			75.0
Semi-annual payments of interest, fixed rate of 3.69%, balloon due June 14, 2022		200.0			200.0
Semi-annual payments of interest, fixed rate of 5.49%, balloon due February 10, 2023		50.0			50.0
Semi-annual payments of interest, fixed rate of 4.13%, balloon due June 24, 2023		200.0			200.0
Semi-annual payments of interest, fixed rate of 4.72%, balloon due February 13, 2024		100.0			100.0
Semi-annual payments of interest, fixed rate of 4.58%, balloon due February 27, 2024		325.0			325.0
Quarterly payments of interest, floating rate of 90 day LIBOR plus 1.40%, balloon due June 13, 2024		50.0			50.0
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			—
Semi-annual payments of interest, fixed rate of 2.46%, balloon due May 5, 2036		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		4,448.0			4,348.0
Credit Agreement:
Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires June 7, 2024		—			—
Premium Financing Debt Facility - expires September 15, 2022:
Facility B
AUD denominated tranche, interbank rates plus 1.400%		147.3			193.1
NZD denominated tranche, interbank rates plus 1.750%		—			—
Facility C and D
AUD denominated tranche, interbank rates plus 0.730%		13.2			—
NZD denominated tranche, interbank rates plus 0.940%		5.6			10.5
Total Premium Financing Debt Facility		166.1			203.6
Total corporate and other debt		6,114.1			4,551.6
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements		(21.7	)		(7.0	)
Less unamortized discount on Bonds Payable		(14.1	)		—
Net corporate and other debt	$	6,078.3		$	4,544.6

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2021

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,
	2021		2020		2021		2020
Net earnings attributable to controlling interests	$	190.2	$	153.7	$	572.3	$	500.0
Weighted average number of common shares outstanding		201.3		190.5		198.0		189.6
Dilutive effect of stock options using the treasury    stock method		4.5		3.6		4.5		4.0
Weighted average number of common and common    equivalent shares outstanding		205.8		194.1		202.5		193.6
Basic net earnings per share	$	0.94	$	0.81	$	2.89	$	2.64
Diluted net earnings per share	$	0.92	$	0.79	$	2.83	$	2.58

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Stock Option Plans (Tables)

6 Months Ended

Jun. 30, 2021

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:

	2021			2020
Expected dividend yield		1.5	%		2.1	%
Expected risk-free interest rate		0.9	%		0.7	%
Volatility		22.9	%		17.3	%
Expected life (in years)		5.4			5.4

Stock Option Activity and Related Information

The following is a summary of our stock option activity and related information for 2021 (in millions, except exercise price and year data):

	Six-month period ended June 30, 2021
						Weighted
						Average
				Weighted		Remaining
	Shares			Average		Contractual		Aggregate
	Under			Exercise		Term		Intrinsic
	Option			Price		(in years)		Value
Beginning balance		7.5		$	65.09
Granted		1.6			127.90
Exercised		(0.9	)		49.43
Forfeited or canceled		(0.1	)		84.41
Ending balance		8.1		$	79.59		4.26	$	488.4
Exercisable at end of period		2.5		$	50.83		2.00	$	222.2
Ending unvested and expected to vest		5.1		$	91.44		5.21	$	250.3

Other Information Regarding Stock Options Outstanding and Exercisable

Other information regarding stock options outstanding and exercisable at June 30, 2021 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
$	43.71	—	$	43.71		1.0	$	1.71	$	43.71		1.0	$	43.71
	46.17	—		46.17		0.5		0.70		46.17		0.5		46.17
	49.55	—		56.86		1.1		2.71		56.83		0.7		56.84
	70.74			70.74		1.1		3.71		70.74		0.3		70.74
	79.59	—		79.59		1.2		4.71		79.59		—		79.59
	86.17	—		86.17		1.6		5.70		86.17		—		86.17
	127.90	—		127.90		1.6		6.72		127.90		—		—
$	43.71	—	$	127.90		8.1		4.26	$	79.59		2.5	$	50.83

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Investments (Tables)

6 Months Ended

Jun. 30, 2021

Equity Method Investments And Joint Ventures [Abstract]

Investments Reported in Other Current and Non-Current Assets

The following is a summary of our investments included in other noncurrent assets in the consolidated balance sheet and the related funding commitments (in millions):

	June 30, 2021				December 31, 2020
			Funding
	Assets		Commitments		Assets
Chem-Mod LLC	$	4.0	$	—	$	4.0
Chem-Mod International LLC		2.0		—		2.0
Clean-coal investments:
Non-controlling interest in a limited liability company that owns one    2011 Era Clean Coal Plant		0.1		—		0.1
Controlling interest in limited liability companies that own twenty    2011 Era Clean Coal Plants		6.1		—		12.4
Other investments		4.9		1.0		3.9
Total investments	$	17.1	$	1.0	$	22.4

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Derivatives and Hedging Activity (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 and December 31, 2020 (in millions):

			Derivative Assets			Derivative Liabilities
	Notional		Balance Sheet	Fair		Balance Sheet	Fair
Instrument	Amount		Classification	Value		Classification	Value
At June 30, 2021
Interest rate contracts	$	1,000.0	Other current assets	$	4.2	Accrued compensation and other current liabilities	$	2.0
			Other noncurrent assets		4.1	Other noncurrent liabilities		8.2
Foreign exchange contracts (1)		26.5	Other current assets		6.6	Accrued compensation and other current liabilities		0.5
			Other noncurrent assets		3.8	Other noncurrent liabilities		3.6
Total	$	1,026.5		$	18.7		$	14.3
At December 31, 2020
Interest rate contracts	$	550.0	Other current assets	$	—	Accrued compensation and other current liabilities	$	54.5
			Other noncurrent assets		—	Other noncurrent liabilities		10.9
Foreign exchange contracts (1)		48.6	Other current assets		5.9	Accrued compensation and other current liabilities		0.6
			Other noncurrent assets		7.8	Other noncurrent liabilities		3.3
Total	$	598.6		$	13.7		$	69.3

(1) Included within foreign exchange contracts at June 30, 2021 were $408.3 million of call options, offset with $408.3 million of put options, and $13.7 million of buy forwards, offset with $40.2 million of sell forwards.  Included within foreign exchange contracts at December 31, 2020 were $354.7 million of call options offset, with $354.7 million of put options, and $9.0 million of buy forwards, offset with $57.6 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 three and six-month periods ended June 30, 2021 and 2020 were as follows (in millions):

							Amount of
				Amount of			Gain (Loss)
				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, 2021
Interest rate contracts	$	(41.7	)	$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		(4.4	)		(1.4	)		(0.1	)	Commission revenue
					(0.2	)		0.2		Compensation expense
					(0.1	)		0.2		Operating expense
Total	$	(46.1	)	$	(2.0	)	$	0.3
Three-month period ended June 30, 2020
Interest rate contracts	$	6.1		$	(0.3	)	$	—		Interest expense
Foreign exchange contracts		2.0			(0.1	)		(0.1	)	Commission revenue
					(0.5	)		0.4		Compensation expense
					(0.4	)		0.2		Operating expense
Total	$	8.1		$	(1.3	)	$	0.5
Six-month period ended June 30, 2021
Interest rate contracts	$	34.1		$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(6.1	)		(2.3	)		(0.2	)	Commission revenue
					(0.5	)		0.6		Compensation expense
					(0.3	)		0.5		Operating expense
Total	$	28.0		$	(3.7	)	$	0.9
Six-month period ended June 30, 2020
Interest rate contracts	$	(108.1	)	$	(0.6	)	$	—		Interest expense
Foreign exchange contracts		(17.3	)		(0.5	)		(0.3	)	Commission revenue
					(0.8	)		0.6		Compensation expense
					(0.6	)		0.4		Operating expense
Total	$	(125.4	)	$	(2.5	)	$	0.7

(1) For the three and six-month periods ended June 30, 2021 and 2020, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of zero and $1.2 million, respectively.  

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

6 Months Ended

Jun. 30, 2021

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, 2021 were as follows (in millions):

	Payments Due by Period
Contractual Obligations	2021			2022			2023			2024			2025			Thereafter			Total
Senior Notes	$	—		$	—		$	—		$	—		$	—		$	1,500.0		$	1,500.0
Note purchase agreements		—			200.0			250.0			475.0			200.0			3,323.0			4,448.0
Credit Agreement		—			—			—			—			—			—			—
Premium Financing Debt Facility		166.1			—			—			—			—			—			166.1
Interest on debt		119.1			234.0			224.9			208.3			193.6			1,496.3			2,476.2
Total debt obligations		285.2			434.0			474.9			683.3			393.6			6,319.3			8,590.3
Operating lease obligations		52.9			101.8			81.8			59.7			45.3			87.6			429.1
Less sublease arrangements		(0.1	)		(0.3	)		(0.3	)		(0.3	)		(0.2	)		(0.5	)		(1.7	)
Outstanding purchase obligations		57.0			60.1			40.0			29.4			21.7			33.0			241.2
Total contractual obligations	$	395.0		$	595.6		$	596.4		$	772.1		$	460.4		$	6,439.4		$	9,258.9

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, 2021 were as follows (in millions):

													Total
	Amount of Commitment Expiration by Period												Amounts
Off-Balance Sheet Commitments	2021		2022		2023		2024		2025		Thereafter		Committed
Letters of credit	$	—	$	—	$	—	$	—	$	—	$	15.2	$	15.2
Financial guarantees		0.1		0.2		0.2		0.2		0.2		0.2		1.1
Funding commitments		1.0		—		—		—		—		—		1.0
Total commitments	$	1.1	$	0.2	$	0.2	$	0.2	$	0.2	$	15.4	$	17.3

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Supplemental Disclosures of Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2021

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):	2021		2020
Interest paid	$	95.8	$	91.7
Income taxes paid, net		115.3		20.0

Summary of Cash, Cash Equivalents and Restricted Cash

The following is a reconciliation of our end of period cash, cash equivalents and restricted cash balances as presented in the consolidated statement of cash flows for the six-month periods ended June 30, 2021 and 2020 (in millions):

	June 30,
	2021		2020
Cash and cash equivalents	$	3,204.1	$	349.7
Restricted cash		3,170.9		2,653.0
Total cash, cash equivalents and restricted cash	$	6,375.0	$	3,002.7

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Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2021

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:  

				Foreign			Fair Value of			Accumulated
	Pension			Currency			Derivative			Comprehensive
	Liability			Translation			Investments			Loss
Balance as of December 31, 2020	$	(56.1	)	$	(491.1	)	$	(96.4	)	$	(643.6	)
Net change in period		1.1			88.4			23.6			113.1
Balance as of June 30, 2021	$	(55.0	)	$	(402.7	)	$	(72.8	)	$	(530.5	)

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 and 2020 is as follows (in millions):

	Three-month period ended June 30,						Six-month period ended June 30,
	2021			2020			2021			2020
Brokerage
Total revenues	$	1,390.2		$	1,201.1		$	3,000.4		$	2,636.7
Earnings before income taxes	$	299.7		$	247.8		$	780.0		$	658.6
Identifiable assets at June 30, 2021 and 2020							$	21,858.6		$	18,405.6
Risk Management
Total revenues	$	281.7		$	223.2		$	534.4		$	472.7
Earnings before income taxes	$	33.4		$	13.2		$	57.5		$	38.8
Identifiable assets at June 30, 2021 and 2020							$	1,058.5		$	929.1
Corporate
Total revenues	$	261.6		$	159.7		$	563.7		$	341.5
Loss before income taxes	$	(110.8	)	$	(89.3	)	$	(206.8	)	$	(169.7	)
Identifiable assets at June 30, 2021 and 2020							$	4,900.1		$	1,971.5
Total
Total revenues	$	1,933.5		$	1,584.0		$	4,098.5		$	3,450.9
Earnings before income taxes	$	222.3		$	171.7		$	630.7		$	527.7
Identifiable assets at June 30, 2021 and 2020							$	27,817.2		$	21,306.2

Summary of Revenues by Type and Segment

Revenues by type and segment for the three-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	977.1	$	—	$	—	$	977.1
Fees		296.0		244.9		—		540.9
Supplemental revenues		55.2		—		—		55.2
Contingent revenues		43.3		—		—		43.3
Investment income		18.1		—		—		18.1
Net gains on divestitures		0.5		0.1		—		0.6
Revenues from clean coal activities		—		—		261.0		261.0
Other net revenues		—		—		0.6		0.6
Revenues before reimbursements		1,390.2		245.0		261.6		1,896.8
Reimbursements		—		36.7		—		36.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

Revenues by type and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	2,102.5	$	—	$	—	$	2,102.5
Fees		629.6		465.1		—		1,094.7
Supplemental revenues		122.0		—		—		122.0
Contingent revenues		106.6		—		—		106.6
Investment income		35.1		0.1		—		35.2
Net gains on divestitures		4.6		0.1		—		4.7
Revenues from clean coal activities		—		—		561.6		561.6
Other net revenues		—		—		2.1		2.1
Revenues before reimbursements		3,000.4		465.3		563.7		4,029.4
Reimbursements		—		69.1		—		69.1
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

Revenues by type and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	827.5	$	—	$	—	$	827.5
Fees		269.1		190.6		—		459.7
Supplemental revenues		50.3		—		—		50.3
Contingent revenues		37.4		—		—		37.4
Investment income		15.8		0.2		—		16.0
Net gains on divestitures		1.0		—		—		1.0
Revenues from clean coal activities		—		—		159.5		159.5
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		1,201.1		190.8		159.7		1,551.6
Reimbursements		—		32.4		—		32.4
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

Revenues by type and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,844.7	$	—	$	—	$	1,844.7
Fees		564.9		402.1		—		967.0
Supplemental revenues		109.3		—		—		109.3
Contingent revenues		82.5		—		—		82.5
Investment income		34.1		0.5		—		34.6
Net gains on divestitures		1.2		—		—		1.2
Revenues from clean coal activities		—		—		341.3		341.3
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		2,636.7		402.6		341.5		3,380.8
Reimbursements		—		70.1		—		70.1
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

Summary of Geographical Location and Segment

Revenues by geographical location and segment for the three-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	812.4	$	231.5	$	261.6	$	1,305.5
United Kingdom		326.1		11.8		—		337.9
Australia		70.7		33.0		—		103.7
Canada		79.9		1.4		—		81.3
New Zealand		45.4		4.0		—		49.4
Other foreign		55.7		—		—		55.7
Total revenues	$	1,390.2	$	281.7	$	261.6	$	1,933.5

Revenues by geographical location and segment for the six-month period ended June 30, 2021 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,919.0	$	439.0	$	563.7	$	2,921.7
United Kingdom		618.5		22.9		—		641.4
Australia		124.7		62.0		—		186.7
Canada		147.4		2.8		—		150.2
New Zealand		77.9		7.7		—		85.6
Other foreign		112.9		—		—		112.9
Total revenues	$	3,000.4	$	534.4	$	563.7	$	4,098.5

Revenues by type and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
Commissions	$	1,844.7	$	—	$	—	$	1,844.7
Fees		564.9		402.1		—		967.0
Supplemental revenues		109.3		—		—		109.3
Contingent revenues		82.5		—		—		82.5
Investment income		34.1		0.5		—		34.6
Net gains on divestitures		1.2		—		—		1.2
Revenues from clean coal activities		—		—		341.3		341.3
Other net revenues		—		—		0.2		0.2
Revenues before reimbursements		2,636.7		402.6		341.5		3,380.8
Reimbursements		—		70.1		—		70.1
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

Revenues by geographical location and segment for the three-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	740.8	$	185.6	$	159.7	$	1,086.1
United Kingdom		260.9		8.2		—		269.1
Australia		56.9		24.7		—		81.6
Canada		58.2		1.5		—		59.7
New Zealand		38.0		3.2		—		41.2
Other foreign		46.3		—		—		46.3
Total revenues	$	1,201.1	$	223.2	$	159.7	$	1,584.0

Revenues by geographical location and segment for the six-month period ended June 30, 2020 are as follows (in millions):

			Risk
	Brokerage		Management		Corporate		Total
Revenues:
United States	$	1,746.7	$	398.3	$	341.5	$	2,486.5
United Kingdom		515.4		19.6		—		535.0
Australia		100.0		46.3		—		146.3
Canada		114.4		2.5		—		116.9
New Zealand		66.0		6.0		—		72.0
Other foreign		94.2		—		—		94.2
Total revenues	$	2,636.7	$	472.7	$	341.5	$	3,450.9

XML

Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2021 Country Segment Facility
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Number of reportable segments | Segment	3
Number of commercial clean coal production facilities | Facility	35
Number of countries in which the company has operations	56
Number of countries in which the company does business through a network of correspondent brokers and consultants	150

XML

Effect of New Accounting Pronouncements - Additional Information (Details) - ASU 2019-12 [Member]	Jun. 30, 2021
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true

XML

Business Combinations - Acquisition Method for Recording Business Combinations (Detail)	6 Months Ended
	Jun. 30, 2021 USD ($) shares
Business Acquisition [Line Items]
Common Shares Issued | shares	152,000.0
Common Share Value	$ 19,400,000
Cash Paid	592,000,000.0
Accrued Liability	100,000
Escrow Deposited	25,700,000
Recorded Earnout Payable	49,200,000
Total Recorded Purchase Price	686,400,000
Maximum Potential Earnout Payable	105,500,000
Atlas General Holdings LLC [Member]
Business Acquisition [Line Items]
Cash Paid	95,200,000
Escrow Deposited	5,400,000
Recorded Earnout Payable	8,700,000
Total Recorded Purchase Price	109,300,000
Maximum Potential Earnout Payable	35,000,000.0
Bollington Wilson Group [Member]
Business Acquisition [Line Items]
Cash Paid	328,000,000.0
Escrow Deposited	1,400,000
Total Recorded Purchase Price	329,400,000
LDJ American Online Benefits Group, LLC [Member]
Business Acquisition [Line Items]
Cash Paid	38,200,000
Escrow Deposited	7,100,000
Recorded Earnout Payable	14,800,000
Total Recorded Purchase Price	60,100,000
Maximum Potential Earnout Payable	$ 20,000,000.0
Eleven Other Acquisitions [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	152,000.0
Common Share Value	$ 19,400,000
Cash Paid	130,600,000
Accrued Liability	100,000
Escrow Deposited	11,800,000
Recorded Earnout Payable	25,700,000
Total Recorded Purchase Price	187,600,000
Maximum Potential Earnout Payable	$ 50,500,000

XML

Business Combinations - Additional Information (Detail) shares in Millions					3 Months Ended		6 Months Ended		234 Months Ended
	Jul. 29, 2021	May 20, 2021 USD ($)	May 17, 2021 USD ($) shares	May 12, 2021 USD ($)	Jun. 30, 2021 USD ($) Entity shares	Jun. 30, 2020 USD ($) Entity	Jun. 30, 2021 USD ($) Entity	Jun. 30, 2020 USD ($) Entity	Jun. 30, 2021 USD ($) Entity	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Cash Paid							$ 592,000,000.0
Aggregate principal amount					$ 6,114,100,000		6,114,100,000		$ 6,114,100,000	$ 4,551,600,000
Accretion of the discount on acquisition					9,200,000	$ 7,700,000	18,200,000	$ 18,400,000
Income (expense) related to net adjustments to estimated fair value of liability for earnout obligations					$ (4,600,000)	$ (8,000,000.0)	$ (10,600,000)	$ 91,600,000
Number of companies acquired | Entity					26	44	48	102	597
Aggregate amount of maximum earnout obligations related to acquisitions							$ 1,068,100,000
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet							560,100,000
Aggregate amount of earnout obligation expected settlement in cash or stock at option					$ 536,200,000		536,200,000		$ 536,200,000
Aggregate amount of earnout obligation expected settlement in cash					23,900,000		23,900,000		23,900,000
Goodwill					387,200,000		387,200,000		387,200,000
Expiration lists					259,500,000		259,500,000		259,500,000
Non-compete agreements					18,200,000		18,200,000		18,200,000
Trade names					4,100,000		4,100,000		4,100,000
Total revenues					1,936,800,000	$ 1,620,000,000.0	4,129,400,000	$ 3,527,300,000
Brokerage and Risk Management [Member]
Business Acquisition [Line Items]
Goodwill					387,200,000		387,200,000		387,200,000
Expiration lists					259,500,000		259,500,000		259,500,000
Non-compete agreements					18,200,000		18,200,000		18,200,000
Trade names					4,100,000		4,100,000		4,100,000
Brokerage [Member]
Business Acquisition [Line Items]
Impairment wrote off of amortizable assets					8,000,000.0	$ 200,000	13,100,000	$ 46,000,000.0
Brokerage [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes					138,600,000		138,600,000		138,600,000
Brokerage [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes					16,400,000		16,400,000		16,400,000
Brokerage [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes					$ 3,300,000		$ 3,300,000		$ 3,300,000
Minimum [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							2 years
Minimum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							2 years
Minimum [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							2 years
Maximum [Member] | Expiration Lists [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							15 years
Maximum [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							6 years
Maximum [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Estimated useful lives of intangibles assets, years							15 years
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member]
Business Acquisition [Line Items]
Periodic payment of interest					2.50%		2.50%		2.50%
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member]
Business Acquisition [Line Items]
Periodic payment of interest					3.50%		3.50%		3.50%
Unsecured Senior Notes [Member] | Private Placement [Member]
Business Acquisition [Line Items]
Aggregate principal amount		$ 1,500,000,000.0			$ 1,500,000,000.0		$ 1,500,000,000.0		$ 1,500,000,000.0
Weighted average interest rate		3.31%
Unsecured Senior Notes [Member] | Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Private Placement [Member]
Business Acquisition [Line Items]
Aggregate principal amount		$ 650,000,000.0			650,000,000.0		650,000,000.0		650,000,000.0
Periodic payment of interest		2.50%
Periodic payments of interest and principal, expiry year		2031
Unsecured Senior Notes [Member] | Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Private Placement [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Notes redemption date	Aug. 13, 2021
Unsecured Senior Notes [Member] | Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member] | Private Placement [Member]
Business Acquisition [Line Items]
Aggregate principal amount		$ 850,000,000.0			$ 850,000,000.0		$ 850,000,000.0		$ 850,000,000.0
Periodic payment of interest		3.50%
Periodic payments of interest and principal, expiry year		2051
Common Stock [Member]
Business Acquisition [Line Items]
Stock issuance from public offering (in shares) | shares					10.3
Willis Towers Watson PLC [Member]
Business Acquisition [Line Items]
Cash Paid				$ 3,570,000,000
Willis Towers Watson PLC [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Agreement termination date	Jul. 29, 2021
Willis Towers Watson PLC [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Stock issuance from public offering (in shares) | shares			10.3
Net proceeds after underwriting, discounts and other expense			$ 1,437,900,000
2021 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input					5.0		5.0		5.0
2021 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input					15.0		15.0		15.0
2021 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input					7.0		7.0		7.0
2021 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Discount Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input					10.5		10.5		10.5
2020 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input					3.0		3.0		3.0
2020 Acquisitions [Member] | Valuation, Market Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input					4.8		4.8		4.8
2020 Acquisitions [Member] | Valuation, Income Approach | Minimum [Member]
Business Acquisition [Line Items]
Attrition rate							4.30%
2020 Acquisitions [Member] | Valuation, Income Approach | Maximum [Member]
Business Acquisition [Line Items]
Attrition rate							16.10%
2020 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Business Acquisition [Line Items]
Measurement input					10.0		10.0		10.0
2020 Acquisitions [Member] | Valuation, Income Approach | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Business Acquisition [Line Items]
Measurement input					13.5		13.5		13.5
Business Acquisition [Member]
Business Acquisition [Line Items]
Trade names					$ 4,100,000		$ 4,100,000		$ 4,100,000
Annualized revenue of business acquisitions							173,800,000
Total revenues							60,600,000
Net earnings							2,700,000
Business Acquisition [Member] | Brokerage [Member]
Business Acquisition [Line Items]
Expiration lists					259,500,000		259,500,000		259,500,000
Non-compete agreements					18,200,000		18,200,000		18,200,000
Deferred tax liability					$ 26,500,000		$ 26,500,000		$ 26,500,000

XML

Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail) $ in Millions	Jun. 30, 2021 USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and restricted cash	$ 65.6
Other current assets	179.9
Fixed assets	11.3
Noncurrent assets	12.1
Goodwill	387.2
Expiration lists	259.5
Non-compete agreements	18.2
Trade names	4.1
Total assets acquired	937.9
Current liabilities	213.8
Noncurrent liabilities	37.7
Total liabilities assumed	251.5
Total net assets acquired	686.4
Atlas General Holdings LLC [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and restricted cash	32.8
Other current assets	112.0
Fixed assets	7.4
Noncurrent assets	1.2
Goodwill	45.9
Expiration lists	39.7
Non-compete agreements	0.3
Total assets acquired	239.3
Current liabilities	129.8
Noncurrent liabilities	0.2
Total liabilities assumed	130.0
Total net assets acquired	109.3
Bollington Wilson Group [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and restricted cash	24.9
Other current assets	15.2
Fixed assets	3.8
Noncurrent assets	5.3
Goodwill	223.0
Expiration lists	109.1
Non-compete agreements	16.1
Trade names	3.2
Total assets acquired	400.6
Current liabilities	39.6
Noncurrent liabilities	31.6
Total liabilities assumed	71.2
Total net assets acquired	329.4
LDJ American Online Benefits Group, LLC [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and restricted cash	0.7
Other current assets	15.8
Noncurrent assets	0.2
Goodwill	29.1
Expiration lists	21.3
Non-compete agreements	0.6
Trade names	0.5
Total assets acquired	68.2
Current liabilities	8.0
Noncurrent liabilities	0.1
Total liabilities assumed	8.1
Total net assets acquired	60.1
Eleven Other Acquisitions [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash and restricted cash	7.2
Other current assets	36.9
Fixed assets	0.1
Noncurrent assets	5.4
Goodwill	89.2
Expiration lists	89.4
Non-compete agreements	1.2
Trade names	0.4
Total assets acquired	229.8
Current liabilities	36.4
Noncurrent liabilities	5.8
Total liabilities assumed	42.2
Total net assets acquired	$ 187.6

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Combinations [Abstract]
Total revenues	$ 1,936.8	$ 1,620.0	$ 4,129.4	$ 3,527.3
Net earnings attributable to controlling interests	$ 190.6	$ 153.2	$ 575.6	$ 500.2
Basic net earnings per share	$ 0.95	$ 0.80	$ 2.91	$ 2.64
Diluted net earnings per share	$ 0.93	$ 0.79	$ 2.84	$ 2.58

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Contracts with Customers - Summary of Unbilled Receivables, Contract Assets and Contract Liabilities from Contracts with Customers (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Contract With Customer Asset And Liability [Abstract]
Unbilled receivables	$ 810.8	$ 603.1
Deferred contract costs	80.7	102.0
Deferred revenue	$ 592.1	$ 541.3

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Contracts with Customers - Summary of Changes in Deferred Revenue Balances (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	$ 541.3
Incremental deferred revenue	307.3
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020	(277.4)
Net change in collected billings/deposits received from customers	6.5
Impact of change in foreign exchange rates	5.8
Deferred revenue recognized from business acquisitions	8.6
Deferred revenue ending balance	592.1
Brokerage [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	354.7
Incremental deferred revenue	256.2
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020	(226.0)
Net change in collected billings/deposits received from customers	(0.2)
Impact of change in foreign exchange rates	5.5
Deferred revenue recognized from business acquisitions	8.6
Deferred revenue ending balance	398.8
Risk Management [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue beginning balance	186.6
Incremental deferred revenue	51.1
Revenue recognized during the six-month period ended June 30, 2021 included in deferred revenue at December 31, 2020	(51.4)
Net change in collected billings/deposits received from customers	6.7
Impact of change in foreign exchange rates	0.3
Deferred revenue ending balance	$ 193.3

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Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Remaining performance obligations	$ 592.1
Deferred contract costs	80.7	$ 102.0
Amortization of deferred contract costs	$ 221.6		$ 208.1

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Contracts with Customers - Summary of Expected Revenue Related to Performance Obligations (Detail) $ in Millions	Jun. 30, 2021 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 592.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 429.4
Remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 104.4
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 32.7
Remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 9.9
Remaining performance obligation, expected timing of satisfaction, period	1 year
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	$ 5.6
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	$ 10.1
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	$ 398.8
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 323.5
Remaining performance obligation, expected timing of satisfaction, period	6 months
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 60.0
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 13.1
Remaining performance obligation, expected timing of satisfaction, period	1 year
Brokerage [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 1.1
Remaining performance obligation, expected timing of satisfaction, period	1 year
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	$ 0.6
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	$ 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	$ 193.3
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-07-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 105.9
Remaining performance obligation, expected timing of satisfaction, period	6 months
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 44.4
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 19.6
Remaining performance obligation, expected timing of satisfaction, period	1 year
Risk Management [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 8.8
Remaining performance obligation, expected timing of satisfaction, period	1 year
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	$ 5.0
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	$ 9.6
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, 2021 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 592.1
Brokerage [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	398.8
Risk Management [Member]
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Expected revenue related to performance obligations	$ 193.3

XML

Other Financial Data - Summary of Major Classes of Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 443.3	$ 442.7
Accrued supplemental, direct bill and other receivables	375.6	361.7
Refined coal production related receivables	137.8	95.4
Deferred contract costs	80.7	102.0
Prepaid expenses	132.1	112.1
Total other current assets	$ 1,169.5	$ 1,113.9

XML

Intangible Assets - Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Total goodwill	$ 6,630.3	$ 6,127.0
Unites States [Member]
Goodwill [Line Items]
Total goodwill	3,608.9	3,433.0
United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	1,618.0	1,343.4
Canada [Member]
Goodwill [Line Items]
Total goodwill	540.3	492.9
Australia [Member]
Goodwill [Line Items]
Total goodwill	480.0	473.6
New Zealand [Member]
Goodwill [Line Items]
Total goodwill	230.8	232.6
Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	152.3	151.5
Brokerage [Member]
Goodwill [Line Items]
Total goodwill	6,524.5	6,053.6
Brokerage [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill	3,543.7	3,399.8
Brokerage [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	1,602.4	1,328.3
Brokerage [Member] | Canada [Member]
Goodwill [Line Items]
Total goodwill	540.3	492.9
Brokerage [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill	468.5	462.1
Brokerage [Member] | New Zealand [Member]
Goodwill [Line Items]
Total goodwill	220.2	221.9
Brokerage [Member] | Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	149.4	148.6
Risk Management [Member]
Goodwill [Line Items]
Total goodwill	102.9	70.5
Risk Management [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill	65.2	33.2
Risk Management [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill	15.6	15.1
Risk Management [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill	11.5	11.5
Risk Management [Member] | New Zealand [Member]
Goodwill [Line Items]
Total goodwill	10.6	10.7
Corporate [Member]
Goodwill [Line Items]
Total goodwill	2.9	2.9
Corporate [Member] | Other Foreign [Member]
Goodwill [Line Items]
Total goodwill	$ 2.9	$ 2.9

XML

Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Line Items]
Beginning Balance	$ 6,127.0
Goodwill acquired during the period	387.2
Goodwill adjustments due to appraisals and other acquisition adjustments	52.5
Goodwill written-off related to sales of business and impairment	(1.0)
Foreign currency translation adjustments during the period	64.6
Ending Balance	6,630.3
Brokerage [Member]
Goodwill [Line Items]
Beginning Balance	6,053.6
Goodwill acquired during the period	355.2
Goodwill adjustments due to appraisals and other acquisition adjustments	52.5
Goodwill written-off related to sales of business and impairment	(1.0)
Foreign currency translation adjustments during the period	64.2
Ending Balance	6,524.5
Risk Management [Member]
Goodwill [Line Items]
Beginning Balance	70.5
Goodwill acquired during the period	32.0
Foreign currency translation adjustments during the period	0.4
Ending Balance	102.9
Corporate [Member]
Goodwill [Line Items]
Beginning Balance	2.9
Ending Balance	$ 2.9

XML

Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, net	$ 2,447.3	$ 2,399.9
Expiration Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	5,017.9	4,753.2
Accumulated amortization	(2,655.0)	(2,436.7)
Amortizable intangible assets, net	2,362.9	2,316.5
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	88.6	75.9
Accumulated amortization	(62.9)	(57.8)
Amortizable intangible assets, net	25.7	18.1
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	105.7	107.8
Accumulated amortization	(47.0)	(42.5)
Amortizable intangible assets, net	$ 58.7	$ 65.3

XML

Intangible Assets - Estimated Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
2021 (remaining six months)	$ 197.8
2022	376.5
2023	349.5
2024	307.8
2025	267.1
Thereafter	948.6
Amortizable intangible assets, net	$ 2,447.3	$ 2,399.9

XML

Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2021	May 20, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 6,114.1		$ 4,551.6
Less unamortized debt acquisition costs on Senior Notes and Note Purchase Agreements	(21.7)		(7.0)
Less unamortized discount on Bonds Payable	(14.1)
Semi-annual payments of interest, Net	6,078.3		4,544.6
Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	4,448.0		4,348.0
Unsecured Senior Notes [Member] | Private Placement [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	1,500.0	$ 1,500.0
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Unsecured Senior Notes [Member] | Private Placement [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	650.0	650.0
Fixed Rate of 5.18%, Balloon Due February 10, 2021 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest			75.0
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member] | Unsecured Senior Notes [Member] | Private Placement [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	850.0	$ 850.0
Fixed Rate of 3.69%, Balloon Due June 14, 2022 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200.0		200.0
Fixed Rate of 5.49%, Balloon Due February 10, 2023 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50.0		50.0
Fixed Rate of 4.13%, Balloon Due June 24, 2023 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200.0		200.0
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		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		325.0
Floating Interest Rate of 1.40% LIBOR Plus Balloon Due June 13, 2024 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50.0		50.0
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
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
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
Interbank Rates Plus 1.400% Expires September 15, 2022 [Member] | AUD Denominated Tranche [Member] | Facility B [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	147.3		193.1
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
Interbank Rates Plus 0.730% Expires September 15, 2022 [Member] | AUD Denominated Tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	13.2
Interbank Rates Plus 0.940% Expires September 15, 2022 [Member] | NZD Denominated Tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	5.6		10.5
Interbank Rates Expires September 15, 2022 [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 166.1		$ 203.6

XML

Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Periodic payments of interest and principal, expiry date	Sep. 15, 2022	Sep. 15, 2022
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	2.50%
Periodic payments of interest and principal, expiry date	May 20, 2031
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.50%
Periodic payments of interest and principal, expiry date	May 20, 2051
Fixed Rate of 5.18%, Balloon Due February 10, 2021 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	5.18%	5.18%
Periodic payments of interest and principal, expiry date	Feb. 10, 2021	Feb. 10, 2021
Fixed Rate of 3.69%, Balloon Due June 14, 2022 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.69%	3.69%
Periodic payments of interest and principal, expiry date	Jun. 14, 2022	Jun. 14, 2022
Fixed Rate of 5.49%, Balloon Due February 10, 2023 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	5.49%	5.49%
Periodic payments of interest and principal, expiry date	Feb. 10, 2023	Feb. 10, 2023
Fixed Rate of 4.13%, Balloon Due June 24, 2023 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.13%	4.13%
Periodic payments of interest and principal, expiry date	Jun. 24, 2023	Jun. 24, 2023
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
Floating Interest Rate of 1.40% LIBOR Plus Balloon Due June 13, 2024 [Member]
Debt Instrument [Line Items]
Periodic payments of interest and principal, expiry date	Jun. 13, 2024	Jun. 13, 2024
Quarterly payments of interest rate	1.40%	1.40%
Quarterly payments of interest, description	90 day LIBOR plus
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 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 4.09%, 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 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 LIBOR Plus up to 1.45%, Expires June 7, 2024 [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	1.45%	1.45%
Periodic payments of interest and principal, expiry date	Jun. 07, 2024	Jun. 07, 2024
Facility B [Member] | Interbank Rates Plus 1.400% Expires September 15, 2022 [Member] | Premium Financing Debt Facility [Member] | AUD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	1.40%	1.40%
Facility B [Member] | Interbank Rates Plus 1.750% Expires September 15, 2022 [Member] | Premium Financing Debt Facility [Member] | NZD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	1.75%	1.75%
Facility C and D [Member] | Interbank Rates Plus 0.730% Expires September 15, 2022 [Member] | Premium Financing Debt Facility [Member] | AUD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	0.73%	0.73%
Facility C and D [Member] | Interbank Rates Plus 0.940% Expires September 15, 2022 [Member] | Premium Financing Debt Facility [Member] | NZD Denominated Tranche [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	0.94%	0.94%

XML

Credit and Other Debt Agreements - Additional Information (Detail) - USD ($)			3 Months Ended
	Jul. 29, 2021	May 20, 2021	Sep. 30, 2021	Jun. 30, 2021
Subsequent Event [Member] | Willis Towers Watson PLC [Member]
Debt Instrument [Line Items]
Agreement termination date	Jul. 29, 2021
Private Placement [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Notes issued and sold		$ 1,500,000,000.0
Weighted average interest rate		3.31%
Realized a cash gain (loss) on hedging transaction		$ (57,800,000)
Derivative instrument, term		10 years
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest				2.50%
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Amount payable to redeem the notes, percent of the principal amount following transaction termination event		101.00%
Number of days to occur reinsurance transaction termination event for note redemption		30 days
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Unsecured Senior Notes [Member] | Scenario, Forecast [Member] | Minimum [Member]
Debt Instrument [Line Items]
Extinguishment of debt after tax loss			$ 12,000,000.0
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Unsecured Senior Notes [Member] | Scenario, Forecast [Member] | Maximum [Member]
Debt Instrument [Line Items]
Extinguishment of debt after tax loss			$ 14,000,000.0
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Private Placement [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Notes issued and sold		$ 650,000,000.0
Periodic Payment of Interest		2.50%
Periodic payments of interest and principal, expiry year		2031
Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Private Placement [Member] | Unsecured Senior Notes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Notes redemption date	Aug. 13, 2021
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest				3.50%
Fixed Rate of 3.50%, Balloon Due May 20, 2051 [Member] | Private Placement [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Notes issued and sold		$ 850,000,000.0
Periodic Payment of Interest		3.50%
Periodic payments of interest and principal, expiry year		2051

XML

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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 190.2	$ 153.7	$ 572.3	$ 500.0
Weighted average number of common shares outstanding	201.3	190.5	198.0	189.6
Dilutive effect of stock options using the treasury stock method	4.5	3.6	4.5	4.0
Weighted average number of common and common equivalent shares outstanding	205.8	194.1	202.5	193.6
Basic net earnings per share	$ 0.94	$ 0.81	$ 2.89	$ 2.64
Diluted net earnings per share	$ 0.92	$ 0.79	$ 2.83	$ 2.58

XML

Earnings Per Share - Additional Information (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Anti-dilutive stock-based awards shares outstanding	1.6	1.6	1.0	1.0

XML

Stock Option Plans - Additional information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended				6 Months Ended
	Mar. 16, 2021	Mar. 12, 2020	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock Option Plans [Line Items]
Compensation expense related to stock option grants			$ 4.5	$ 3.7	$ 3.3	$ 3.4	$ 8.2	$ 6.7
Total intrinsic value of options exercised							78.1	$ 47.1
Total unrecognized compensation cost related to nonvested options			$ 57.6				$ 57.6
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							$ 23.38	$ 9.99
Long Term Incentive Plan [Member]
Stock Option Plans [Line Items]
Maximum number of shares available							1,800,000
Shares available for grant			9,400,000				9,400,000
Long Term Incentive Plan [Member] | Officer and Key Employees [Member]
Stock Option Plans [Line Items]
Shares available for grant	1,640,000	1,590,740
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							55 years	55 years
2017 Long Term Incentive Plan [Member]
Stock Option Plans [Line Items]
Number Of Periods Options Expire							7 years

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Stock Option Plans - Black-Scholes Option Pricing Model with Weighted Average (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected dividend yield	$ 1.5	$ 2.1
Expected risk-free interest rate	0.90%	0.70%
Volatility	22.90%	17.30%
Expected life (in years)	5 years 4 months 24 days	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, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Under Option, Beginning balance	7.5
Shares Under Option, Granted	1.6
Shares Under Option, Exercised	(0.9)
Shares Under Option, Forfeited or canceled	(0.1)
Shares Under Option, Ending balance	8.1
Shares Under Option, Exercisable at end of year	2.5
Shares Under Option, Ending unvested and expected to vest	5.1
Weighted Average Exercise Price, Beginning balance	$ 65.09
Weighted Average Exercise Price, Granted	127.90
Weighted Average Exercise Price, Exercised	49.43
Weighted Average Exercise Price, Forfeited or canceled	84.41
Weighted Average Exercise Price, Ending balance	79.59
Weighted Average Exercise Price, Exercisable at end of year	50.83
Weighted Average Exercise Price, Ending unvested and expected to vest	$ 91.44
Weighted Average Remaining Contractual Term (in years), Ending balance	4 years 3 months 3 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of year	2 years
Weighted Average Remaining Contractual Term (in years), Ending unvested and expected to vest	5 years 2 months 15 days
Aggregate Intrinsic Value, Ending Balance	$ 488.4
Aggregate Intrinsic Value, Exercisable at end of year	222.2
Aggregate Intrinsic Value, Ending unvested and expected to vest	$ 250.3

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Stock Option Plans - Stock Options Outstanding and Exercisable (Detail) - $ / shares shares in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 43.71
Range of Exercise Prices, maximum	$ 127.90
Option Outstanding, Number Outstanding	8.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 3 months 3 days
Option Outstanding, Weighted Average Exercise Price	$ 79.59	$ 65.09
Options Exercisable, Number Exercisable	2.5
Option Exercisable, Weighted Average Exercise Price	$ 50.83
Exercise Prices Range $ 43.71 - $ 43.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	43.71
Range of Exercise Prices, maximum	$ 43.71
Option Outstanding, Number Outstanding	1.0
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	1 year 8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 43.71
Options Exercisable, Number Exercisable	1.0
Option Exercisable, Weighted Average Exercise Price	$ 43.71
Exercise Prices Range $ 46.17 - $ 46.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	46.17
Range of Exercise Prices, maximum	$ 46.17
Option Outstanding, Number Outstanding	0.5
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	8 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 46.17
Options Exercisable, Number Exercisable	0.5
Option Exercisable, Weighted Average Exercise Price	$ 46.17
Exercise Prices Range $ 49.55 - $ 56.86 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	49.55
Range of Exercise Prices, maximum	$ 56.86
Option Outstanding, Number Outstanding	1.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 56.83
Options Exercisable, Number Exercisable	0.7
Option Exercisable, Weighted Average Exercise Price	$ 56.84
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	1.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 70.74
Options Exercisable, Number Exercisable	0.3
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	1.2
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 15 days
Option Outstanding, Weighted Average Exercise Price	$ 79.59
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	1.6
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 8 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 86.17
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	127.90
Range of Exercise Prices, maximum	$ 127.90
Option Outstanding, Number Outstanding	1.6
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 8 months 19 days
Option Outstanding, Weighted Average Exercise Price	$ 127.90

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Deferred Compensation - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
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		$ 17,000,000.0		$ 14,100,000
Charge to compensation expenses related to awards	$ 3,800,000		$ 3,700,000		$ 6,500,000	$ 6,000,000.0
Unearned deferred compensation, value					$ 78,900,000		$ 60,500,000
Unearned deferred compensation, shares					2.7		2.6
Total intrinsic value of unvested equity based awards					$ 383,300,000		$ 327,800,000
Cash and equity awards with aggregate fair value vested and distributed to participants					4,800,000	9,800,000
Deferred Equity Participation Plan Sub Plans [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		3,200,000		1,800,000
Charge to compensation expenses related to awards	700,000		700,000		1,400,000	1,400,000
Distributions from the sub-plans					0	0
Deferred Cash Participation Plan (DCPP) [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		$ 7,200,000		$ 3,000,000.0
Charge to compensation expenses related to awards	$ 2,100,000		$ 1,700,000		4,100,000	3,400,000
Cash and equity awards with aggregate fair value vested and distributed to participants					$ 6,700,000	$ 7,300,000

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Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail)			3 Months Ended					6 Months Ended
	Mar. 16, 2021 USD ($) shares	Mar. 12, 2020 USD ($) shares	Jun. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 shares	Jun. 30, 2021 USD ($) TIME shares	Jun. 30, 2020 USD ($) shares	Dec. 31, 2020 shares	Mar. 14, 2019 USD ($) shares	Mar. 15, 2018 USD ($) shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding | shares			8,100,000					8,100,000		7,500,000
Restricted Stock Units (RSUs) [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares				314,000		405,900
Fair value of grants in period				$ 40,100,000		$ 34,900,000
Share based payment award vesting date				Mar. 16, 2026		Mar. 12, 2025
Period of service from grant date stock options awarded not subject to forfeiture				2 years		2 years
Restricted stock or unit expense			$ 7,600,000		$ 6,600,000			$ 13,500,000	$ 11,500,000
Unvested Restricted Stock [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Total intrinsic value			269,700,000		207,400,000			269,700,000	207,400,000
Equity awards with an aggregate fair value			1,300,000		800,000			48,100,000	30,600,000
Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Restricted stock or unit expense			3,200,000		2,400,000			6,200,000	8,500,000
Total intrinsic value			55,000,000.0		28,600,000			55,000,000.0	28,600,000
Equity awards with an aggregate fair value								$ 19,100,000	12,500,000
Shares authorized | shares	67,000	82,500
Performance share awards approved, Fair value	$ 8,600,000	$ 7,100,000
Vesting period, years				2 years
2017 Performance Share Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional awards, terms								The 2021 and 2020 awards are subject to a three-year performance period that began on January 1, 2021 and 2020, respectively, and vest on the three-year anniversary of the date of grant (March 16, 2024 and March 12, 2023).
2019 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses			1,900,000		1,900,000			$ 5,100,000	4,100,000
Performance awards expiration date								Jan. 01, 2022
2020 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses			$ 2,300,000					$ 5,200,000
Performance awards expiration date								Jan. 01, 2023
2018 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			176,300					176,300
Cash-based compensation awards, expenses					$ 900,000			$ 17,700,000	$ 3,500,000
Performance awards expiration date							Jan. 01, 2021
2017 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					221,600				221,600
Cash-based compensation awards, expenses									$ 18,900,000
Executive Officer [Member] | Restricted Stock Units (RSUs) [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		55 years
Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Performance awards period, years	1 year
Officer and Key Employees [Member] | Cash Awards [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 on December 31, 2023, 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	$ 18,800,000	$ 18,400,000									$ 16,500,000	$ 15,000,000.0
Provisional compensation cash award approved for future grant by compensation committee, units | shares	147,000	213,000		208,000		200,000	190,000				206,800	219,000
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
Cash-based compensation awards, expenses								$ 0
Long Term Incentive Plan [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding, Value			$ 4,000,000.0					$ 4,000,000.0
Share-based compensation, shares outstanding | shares			1,800,000					1,800,000
Shares granted in the period | shares								1,800,000
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								55 years	55 years

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Investments - Investments Reported in Other Current and Non-Current Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Assets	$ 17.1	$ 22.4
Funding Commitments	1.0
Chem-Mod LLC [Member]
Schedule of Equity Method Investments [Line Items]
Assets	4.0	4.0
Chem-Mod International LLC [Member]
Schedule of Equity Method Investments [Line Items]
Assets	2.0	2.0
Clean-Coal Investments [Member] | Noncontrolling Interests [Member] | One 2011 Era Clean Coal Plant [Member]
Schedule of Equity Method Investments [Line Items]
Assets	0.1	0.1
Clean-Coal Investments [Member] | Controlling Interest [Member] | Twenty 2011 Era Clean Coal Plants [Member]
Schedule of Equity Method Investments [Line Items]
Assets	6.1	12.4
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Assets	4.9	$ 3.9
Funding Commitments	$ 1.0

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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Detail) - USD ($)		Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Notional Amount		$ 1,026,500,000	$ 598,600,000
Derivatives Assets		18,700,000	13,700,000
Derivative Liabilities		14,300,000	69,300,000
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		1,000,000,000.0	550,000,000.0
Interest Rate Contracts [Member] | Other current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets		4,200,000
Interest Rate Contracts [Member] | Other noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets		4,100,000
Interest Rate Contracts [Member] | Accrued compensation and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities		2,000,000.0	54,500,000
Interest Rate Contracts [Member] | Other noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities		8,200,000	10,900,000
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	[1]	26,500,000	48,600,000
Foreign Exchange Contracts [Member] | Other current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	[1]	6,600,000	5,900,000
Foreign Exchange Contracts [Member] | Other noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets		3,800,000	7,800,000
Foreign Exchange Contracts [Member] | Accrued compensation and other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	[1]	500,000	600,000
Foreign Exchange Contracts [Member] | Other noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities		$ 3,600,000	$ 3,300,000

[1] Included within foreign exchange contracts at June 30, 2021 were $408.3 million of call options, offset with $408.3 million of put options, and $13.7 million of buy forwards, offset with $40.2 million of sell forwards.  Included within foreign exchange contracts at December 31, 2020 were $354.7 million of call options offset, with $354.7 million of put options, and $9.0 million of buy forwards, offset with $57.6 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, 2021	Dec. 31, 2020
Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	$ 408.3	$ 354.7
Put Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	408.3	354.7
Forward Contracts [Member] | Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	40.2	57.6
Forward Contracts [Member] | Put Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	$ 13.7	$ 9.0

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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	$ (46.1)	$ 8.1	$ 28.0	$ (125.4)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Earnings		(2.0)	(1.3)	(3.7)	(2.5)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		0.3	0.5	0.9	0.7
Interest expense [Member] | Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	(41.7)	6.1	34.1	(108.1)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Earnings		(0.3)	(0.3)	(0.6)	(0.6)
Commission revenue [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	[1]	(4.4)	2.0	(6.1)	(17.3)
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Earnings		(1.4)	(0.1)	(2.3)	(0.5)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		(0.1)	(0.1)	(0.2)	(0.3)
Compensation expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Earnings		(0.2)	(0.5)	(0.5)	(0.8)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		0.2	0.4	0.6	0.6
Operating expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Earnings		(0.1)	(0.4)	(0.3)	(0.6)
Amount of Gain (Loss) Recognized in Earnings Related to Amount Excluded from Effectiveness Testing		$ 0.2	$ 0.2	$ 0.5	$ 0.4

[1] For the three and six-month periods ended June 30, 2021 and 2020, the amount excluded from the assessment of hedge effectiveness for our foreign exchange contracts recognized in accumulated other comprehensive loss was a loss of zero and $1.2 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, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), foreign currency transaction and translation adjustment, net of tax	$ 30.1	$ 58.6	$ 249.9	$ (380.1)
Foreign Exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), foreign currency transaction and translation adjustment, net of tax	$ 0.0		$ 1.2		$ 0.0	$ 1.2

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Derivatives and Hedging Activity - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Scenario, Forecast [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Estimated pretax loss to be reclassified from accumulated other comprehensive loss into earnings	$ 5.7

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Jun. 30, 2021 USD ($)
Senior Notes [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, Thereafter	$ 1,500.0
Contractual Obligations, Payments Due by Period, Total	1,500.0
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2022	200.0
Contractual Obligations, Payments Due by Period, 2023	250.0
Contractual Obligations, Payments Due by Period, 2024	475.0
Contractual Obligations, Payments Due by Period, 2025	200.0
Contractual Obligations, Payments Due by Period, Thereafter	3,323.0
Contractual Obligations, Payments Due by Period, Total	4,448.0
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	166.1
Contractual Obligations, Payments Due by Period, Total	166.1
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	119.1
Contractual Obligations, Payments Due by Period, 2022	234.0
Contractual Obligations, Payments Due by Period, 2023	224.9
Contractual Obligations, Payments Due by Period, 2024	208.3
Contractual Obligations, Payments Due by Period, 2025	193.6
Contractual Obligations, Payments Due by Period, Thereafter	1,496.3
Contractual Obligations, Payments Due by Period, Total	2,476.2
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	285.2
Contractual Obligations, Payments Due by Period, 2022	434.0
Contractual Obligations, Payments Due by Period, 2023	474.9
Contractual Obligations, Payments Due by Period, 2024	683.3
Contractual Obligations, Payments Due by Period, 2025	393.6
Contractual Obligations, Payments Due by Period, Thereafter	6,319.3
Contractual Obligations, Payments Due by Period, Total	8,590.3
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	52.9
Contractual Obligations, Payments Due by Period, 2022	101.8
Contractual Obligations, Payments Due by Period, 2023	81.8
Contractual Obligations, Payments Due by Period, 2024	59.7
Contractual Obligations, Payments Due by Period, 2025	45.3
Contractual Obligations, Payments Due by Period, Thereafter	87.6
Contractual Obligations, Payments Due by Period, Total	429.1
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Receivable by Period, 2021	(0.1)
Contractual Obligations, Payments Receivable by Period, 2022	(0.3)
Contractual Obligations, Payments Receivable by Period, 2023	(0.3)
Contractual Obligations, Payments Receivable by Period, 2024	(0.3)
Contractual Obligations, Payments Receivable by Period, 2025	(0.2)
Contractual Obligations, Payments Receivable by Period, Thereafter	(0.5)
Contractual Obligations, Payments Receivable by Period, Total	(1.7)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	57.0
Contractual Obligations, Payments Due by Period, 2022	60.1
Contractual Obligations, Payments Due by Period, 2023	40.0
Contractual Obligations, Payments Due by Period, 2024	29.4
Contractual Obligations, Payments Due by Period, 2025	21.7
Contractual Obligations, Payments Due by Period, Thereafter	33.0
Contractual Obligations, Payments Due by Period, Total	241.2
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2021	395.0
Contractual Obligations, Payments Due by Period, 2022	595.6
Contractual Obligations, Payments Due by Period, 2023	596.4
Contractual Obligations, Payments Due by Period, 2024	772.1
Contractual Obligations, Payments Due by Period, 2025	460.4
Contractual Obligations, Payments Due by Period, Thereafter	6,439.4
Contractual Obligations, Payments Due by Period, Total	$ 9,258.9

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail)		3 Months Ended		6 Months Ended		234 Months Ended
	Jul. 29, 2021	Jun. 30, 2021 USD ($) ft² Entity LetterOfCredit	Jun. 30, 2020 Entity	Jun. 30, 2021 USD ($) ft² Entity Employee LetterOfCredit Company	Jun. 30, 2020 Entity	Jun. 30, 2021 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 employees will accommodate at new facility | Employee				2,000
Number of companies acquired | Entity		26	44	48	102	597
Aggregate amount of maximum earnout obligations related to acquisitions				$ 1,068,100,000
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet				560,100,000
Aggregate amount of earnout obligation expected settlement in cash or stock at option		$ 536,200,000		536,200,000		$ 536,200,000
Aggregate amount of earnout obligation expected settlement in cash		$ 23,900,000		23,900,000		$ 23,900,000
Income tax credits and adjustments				$ 108,000,000.0
Security Deposit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit		1		1		1
Collateral [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		6		6		6
Errors And Omissions [Member] | Up to $4.5 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained				$ 4,500,000
Errors And Omissions [Member] | Up to $10 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained				10,000,000.0
Insurance claim arise during ordinary course of business		$ 10,000,000.0		10,000,000.0		$ 10,000,000.0
Errors And Omissions [Member] | Up to $20.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained				20,000,000.0
Errors And Omissions [Member] | Up to $27.0 Million [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained				27,000,000.0
Letter of Credit [Member] | Security Deposit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt		500,000		500,000		500,000
Letter of Credit [Member] | Collateral [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt		1,000,000.0		1,000,000.0		1,000,000.0
Letter of Credit [Member] | Self-Insurance Deductibles [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt		9,400,000		9,400,000		9,400,000
Liabilities recorded on self-insurance		18,000,000.0		18,000,000.0		18,000,000.0
Letter of Credit [Member] | Rent-A-Captive Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt		4,300,000		$ 4,300,000		4,300,000
Minimum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of micro-captive insurance companies organized or managed | Company				100
Minimum [Member] | Errors And Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Actuarial range value		3,100,000		$ 3,100,000		3,100,000
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		10,000,000.0		10,000,000.0		10,000,000.0
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		240,000,000.0		240,000,000.0		240,000,000.0
Maximum [Member] | Errors And Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Actuarial range value		7,200,000		7,200,000		7,200,000
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		240,000,000.0		240,000,000.0		240,000,000.0
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		$ 350,000,000.0		$ 350,000,000.0		$ 350,000,000.0
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%
Unsecured Senior Notes [Member] | Fixed Rate of 2.50%, Balloon Due May 20, 2031 [Member] | Private Placement [Member] | Subsequent Event [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Notes redemption date	Aug. 13, 2021

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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2021	$ 1.1
Amount of Commitment Expiration by Period - 2022	0.2
Amount of Commitment Expiration by Period - 2023	0.2
Amount of Commitment Expiration by Period - 2024	0.2
Amount of Commitment Expiration by Period - 2025	0.2
Amount of Commitment Expiration by Period - Thereafter	15.4
Total Amounts Committed	17.3
Funding Commitments [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2021	1.0
Total Amounts Committed	1.0
Financial Guarantees [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2021	0.1
Amount of Commitment Expiration by Period - 2022	0.2
Amount of Commitment Expiration by Period - 2023	0.2
Amount of Commitment Expiration by Period - 2024	0.2
Amount of Commitment Expiration by Period - 2025	0.2
Amount of Commitment Expiration by Period - Thereafter	0.2
Total Amounts Committed	1.1
Letters of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - Thereafter	15.2
Total Amounts Committed	$ 15.2

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Supplemental Disclosures of Cash Flow Information - Cash Flow (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash And Cash Equivalents [Abstract]
Interest paid	$ 95.8	$ 91.7
Income taxes paid, net	$ 115.3	$ 20.0

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Supplemental Disclosures of Cash Flow Information - Cash Equivalents And Restricted Cash (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 3,204.1	$ 664.6	$ 349.7
Restricted cash	3,170.9	$ 2,909.7	2,653.0
Total cash, cash equivalents and restricted cash	$ 6,375.0		$ 3,002.7

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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	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
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		$ 34.5	$ 30.3

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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, 2021 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance as of December 31, 2020	$ (643.6)
Balance as of June 30, 2021	(530.5)
Pension Liability [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance as of December 31, 2020	(56.1)
Net change in period	1.1
Balance as of June 30, 2021	(55.0)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance as of December 31, 2020	(491.1)
Net change in period	88.4
Balance as of June 30, 2021	(402.7)
Fair Value of Derivative Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance as of December 31, 2020	(96.4)
Net change in period	23.6
Balance as of June 30, 2021	(72.8)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance as of December 31, 2020	(643.6)
Net change in period	113.1
Balance as of June 30, 2021	$ (530.5)

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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Expense related to pension liability reclassified from accumulated other comprehensive earnings	$ 2,900,000	$ 3,100,000
Loss related to fair value of derivative investments reclassified from accumulated other comprehensive earnings	3,700,000	2,500,000
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, 2021 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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 1,933.5	$ 1,584.0	$ 4,098.5	$ 3,450.9
Earnings before income taxes	222.3	171.7	630.7	527.7
Identifiable assets at June 30, 2021 and 2020	27,817.2	21,306.2	27,817.2	21,306.2	$ 22,331.4
Operating Segments [Member] | Brokerage [Member]
Segment Reporting Information [Line Items]
Total revenues	1,390.2	1,201.1	3,000.4	2,636.7
Earnings before income taxes	299.7	247.8	780.0	658.6
Identifiable assets at June 30, 2021 and 2020	21,858.6	18,405.6	21,858.6	18,405.6
Operating Segments [Member] | Risk Management [Member]
Segment Reporting Information [Line Items]
Total revenues	281.7	223.2	534.4	472.7
Earnings before income taxes	33.4	13.2	57.5	38.8
Identifiable assets at June 30, 2021 and 2020	1,058.5	929.1	1,058.5	929.1
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Total revenues	261.6	159.7	563.7	341.5
Earnings before income taxes	(110.8)	(89.3)	(206.8)	(169.7)
Identifiable assets at June 30, 2021 and 2020	$ 4,900.1	$ 1,971.5	$ 4,900.1	$ 1,971.5

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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 1,896.8	$ 1,551.6	$ 4,029.4	$ 3,380.8
Reimbursements	36.7	32.4	69.1	70.1
Total revenues	1,933.5	1,584.0	4,098.5	3,450.9
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	1,390.2	1,201.1	3,000.4	2,636.7
Total revenues	1,390.2	1,201.1	3,000.4	2,636.7
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	245.0	190.8	465.3	402.6
Reimbursements	36.7	32.4	69.1	70.1
Total revenues	281.7	223.2	534.4	472.7
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	261.6	159.7	563.7	341.5
Total revenues	261.6	159.7	563.7	341.5
Commissions [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	977.1	827.5	2,102.5	1,844.7
Commissions [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	977.1	827.5	2,102.5	1,844.7
Broker Fees [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	540.9	459.7	1,094.7	967.0
Broker Fees [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	296.0	269.1	629.6	564.9
Broker Fees [Member] | Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	244.9	190.6	465.1	402.1
Supplemental Revenue Member [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	55.2	50.3	122.0	109.3
Supplemental Revenue Member [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	55.2	50.3	122.0	109.3
Contingent Revenue [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	43.3	37.4	106.6	82.5
Contingent Revenue [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	43.3	37.4	106.6	82.5
Investment Income [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	18.1	16.0	35.2	34.6
Investment Income [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	18.1	15.8	35.1	34.1
Investment Income [Member] | Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements		0.2	0.1	0.5
Net Gains on Divestitures [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.6	1.0	4.7	1.2
Net Gains on Divestitures [Member] | Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.5	1.0	4.6	1.2
Net Gains on Divestitures [Member] | Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.1		0.1
Clean Coal Activities [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	261.0	159.5	561.6	341.3
Clean Coal Activities [Member] | Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	261.0	159.5	561.6	341.3
Other Net Revenue [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	0.6	0.2	2.1	0.2
Other Net Revenue [Member] | Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues before reimbursements	$ 0.6	$ 0.2	$ 2.1	$ 0.2

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Segment Information - Summary of Geographical Location and Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total revenues	$ 1,933.5	$ 1,584.0	$ 4,098.5	$ 3,450.9
Unites States [Member]
Segment Reporting Information [Line Items]
Total revenues	1,305.5	1,086.1	2,921.7	2,486.5
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	337.9	269.1	641.4	535.0
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	103.7	81.6	186.7	146.3
Canada [Member]
Segment Reporting Information [Line Items]
Total revenues	81.3	59.7	150.2	116.9
New Zealand [Member]
Segment Reporting Information [Line Items]
Total revenues	49.4	41.2	85.6	72.0
Other Foreign [Member]
Segment Reporting Information [Line Items]
Total revenues	55.7	46.3	112.9	94.2
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1,390.2	1,201.1	3,000.4	2,636.7
Brokerage [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	812.4	740.8	1,919.0	1,746.7
Brokerage [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	326.1	260.9	618.5	515.4
Brokerage [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	70.7	56.9	124.7	100.0
Brokerage [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	79.9	58.2	147.4	114.4
Brokerage [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	45.4	38.0	77.9	66.0
Brokerage [Member] | Other Foreign [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	55.7	46.3	112.9	94.2
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	281.7	223.2	534.4	472.7
Risk Management [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	231.5	185.6	439.0	398.3
Risk Management [Member] | United Kingdom [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	11.8	8.2	22.9	19.6
Risk Management [Member] | Australia [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	33.0	24.7	62.0	46.3
Risk Management [Member] | Canada [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	1.4	1.5	2.8	2.5
Risk Management [Member] | New Zealand [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	4.0	3.2	7.7	6.0
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	261.6	159.7	563.7	341.5
Corporate [Member] | Unites States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 261.6	$ 159.7	$ 563.7	$ 341.5