Segment Information (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

Financial information relating to our segments for 2023, 2022 and 2021 is as follows (in millions):

Year Ended December 31, 2023	Brokerage			Risk Management			Corporate			Total
Revenues:
Commissions	$	5,865.0		$	—		$	—		$	5,865
Fees		1,885.0			1,259.7			—			3,144.7
Supplemental revenues		314.2			—			—			314.2
Contingent revenues		235.3			—			—			235.3
Interest income, premium finance revenues and other income		337.7			27.9			1.7			367.3
Revenues before reimbursements		8,637.2			1,287.6			1.7			9,926.5
Reimbursements		—			145.4			—			145.4
Total revenues		8,637.2			1,433.0			1.7			10,071.9
Compensation		4,769.1			776.8			135.3			5,681.2
Operating		1,272.3			257.4			160.0			1,689.7
Reimbursements		—			145.4			—			145.4
Interest		—			—			296.7			296.7
Depreciation		124.4			35.9			4.9			165.2
Amortization		523.6			7.7			—			531.3
Change in estimated acquisition earnout payables		376.8			0.5			—			377.3
Total expenses		7,066.2			1,223.7			596.9			8,886.8
Earnings (loss) before income taxes		1,571.0			209.3			(595.2	)		1,185.1
Provision (benefit) for income taxes		401.6			55.3			(237.8	)		219.1
Net earnings (loss)		1,169.4			154.0			(357.4	)		966.0
Net earnings (loss) attributable to noncontrolling interests		6.3			—			(9.8	)		(3.5	)
Net earnings (loss) attributable to controlling interests	$	1,163.1		$	154.0		$	(347.6	)	$	969.5
Net foreign exchange loss	$	(0.3	)	$	(9.9	)	$	(0.1	)	$	(10.3	)
Revenues:
United States	$	5,216.1		$	1,208.7		$	1.7		$	6,426.5
United Kingdom		1,946.5			47.6			—			1,994.1
Australia		312.1			154.7			—			466.8
Canada		397.7			6.2			—			403.9
New Zealand		192.2			15.8			—			208.0
Other foreign		572.6			—			—			572.6
Total revenues	$	8,637.2		$	1,433.0		$	1.7		$	10,071.9
At December 31, 2023
Identifiable assets:
United States	$	21,763.9		$	1,026.0		$	2,520.4		$	25,310.3
United Kingdom		15,999.7			129.9			—			16,129.6
Australia		1,969.7			469.2			—			2,438.9
Canada		1,692.9			4.1			—			1,697.0
New Zealand		773.1			20.1			—			793.2
Other foreign		5,246.8			—			—			5,246.8
Total identifiable assets	$	47,446.1		$	1,649.3		$	2,520.4		$	51,615.8
Goodwill - net	$	11,217.8		$	238.8		$	19.0		$	11,475.6
Amortizable intangible assets - net		4,427.9			205.4			—			4,633.3

Year Ended December 31, 2022	Brokerage		Risk Management			Corporate			Total
Revenues:
Commissions	$	5,187.4	$	—		$	—		$	5,187.4
Fees		1,476.9		1,090.8			—			2,567.7
Supplemental revenues		284.7		—			—			284.7
Contingent revenues		207.3		—			—			207.3
Interest income, premium finance revenues and other income		147.5		1.8			0.7			150.0
Revenue from clean coal activities		—		—			23.0			23.0
Revenues before reimbursements		7,303.8		1,092.6			23.7			8,420.1
Reimbursements		—		130.5			—			130.5
Total revenues		7,303.8		1,223.1			23.7			8,550.6
Compensation		4,024.7		664.9			110.2			4,799.8
Operating		1,039.9		233.9			57.1			1,330.9
Reimbursements		—		130.5			—			130.5
Cost of revenues from clean coal activities		—		—			22.9			22.9
Interest		—		—			256.9			256.9
Depreciation		103.6		37.8			3.3			144.7
Amortization		448.7		6.2			—			454.9
Change in estimated acquisition earnout payables		90.4		(7.4	)		—			83.0
Total expenses		5,707.3		1,065.9			450.4			7,223.6
Earnings (loss) before income taxes		1,596.5		157.2			(426.7	)		1,327.0
Provision (benefit) for income taxes		394.7		41.4			(225.1	)		211.0
Net earnings (loss)		1,201.8		115.8			(201.6	)		1,116.0
Net earnings (loss) attributable to noncontrolling interests		4.4		—			(2.6	)		1.8
Net earnings (loss) attributable to controlling interests	$	1,197.4	$	115.8		$	(199.0	)	$	1,114.2
Net foreign exchange gain	$	2.6	$	31.4		$	—		$	34.0
Revenues:
United States	$	4,503.9	$	1,029.6		$	23.7		$	5,557.2
United Kingdom		1,544.3		44.1			—			1,588.4
Australia		281.8		129.1			—			410.9
Canada		356.0		5.9			—			361.9
New Zealand		166.9		14.4			—			181.3
Other foreign		450.9		—			—			450.9
Total revenues	$	7,303.8	$	1,223.1		$	23.7		$	8,550.6
At December 31, 2022
Identifiable assets:
United States	$	17,485.3	$	914.5		$	2,540.8		$	20,940.6
United Kingdom		9,338.5		115.9			—			9,454.4
Australia		1,792.1		89.0			—			1,881.1
Canada		1,465.3		4.4			—			1,469.7
New Zealand		730.9		18.8			—			749.7
Other foreign		3,862.9		—			—			3,862.9
Total identifiable assets	$	34,675.0	$	1,142.6		$	2,540.8		$	38,358.4
Goodwill - net	$	9,358.1	$	112.2		$	19.1		$	9,489.4
Amortizable intangible assets - net		3,325.9		46.2			—			3,372.1

Year Ended December 31, 2021	Brokerage			Risk Management		Corporate			Total
Revenues:
Commissions	$	4,132.3		$	—	$	—		$	4,132.3
Fees		1,296.9			967.2		—			2,264.1
Supplemental revenues		248.7			—		—			248.7
Contingent revenues		188.0			—		—			188.0
Interest income, premium finance revenues and other income		101.6			0.4		0.5			102.5
Revenue from clean coal activities		—			—		1,140.8			1,140.8
Revenues before reimbursements		5,967.5			967.6		1,141.3			8,076.4
Reimbursements		—			133.0		—			133.0
Total revenues		5,967.5			1,100.6		1,141.3			8,209.4
Compensation		3,252.4			580.7		94.4			3,927.5
Operating		757.9			209.8		104.7			1,072.4
Reimbursements		—			133.0		—			133.0
Cost of revenues from clean coal activities		—			—		1,173.2			1,173.2
Interest		—			—		226.1			226.1
Loss on extinguishment of debt		—			—		16.2			16.2
Depreciation		87.8			46.2		17.2			151.2
Amortization		407.6			7.5		—			415.1
Change in estimated acquisition earnout payables		116.3			3.3		—			119.6
Total expenses		4,622.0			980.5		1,631.8			7,234.3
Earnings (loss) before income taxes		1,345.5			120.1		(490.5	)		975.1
Provision (benefit) for income taxes		328.9			30.6		(339.4	)		20.1
Net earnings (loss)		1,016.6			89.5		(151.1	)		955.0
Net earnings attributable to noncontrolling interests		8.4			—		39.8			48.2
Net earnings (loss) attributable to controlling interests	$	1,008.2		$	89.5	$	(190.9	)	$	906.8
Net foreign exchange loss	$	(1.7	)	$	-	$	(0.6	)	$	(2.3	)
Revenues:
United States	$	3,804.8		$	910.7	$	1,141.3		$	5,856.8
United Kingdom		1,199.0			46.0		—			1,245.0
Australia		252.6			123.5		—			376.1
Canada		302.2			5.8		—			308.0
New Zealand		162.4			14.6		—			177.0
Other foreign		246.5			—		—			246.5
Total revenues	$	5,967.5		$	1,100.6	$	1,141.3		$	8,209.4
At December 31, 2021
Identifiable assets:
United States	$	15,136.5		$	790.2	$	2,632.6		$	18,559.3
United Kingdom		8,170.7			134.1		—			8,304.8
Australia		1,674.3			84.7		—			1,759.0
Canada		1,427.2			4.4		—			1,431.6
New Zealand		754.5			20.4		—			774.9
Other foreign		2,406.5			—		—			2,406.5
Total identifiable assets	$	29,569.7		$	1,033.8	$	2,632.6		$	33,236.1
Goodwill - net	$	8,544.6		$	100.9	$	20.7		$	8,666.2
Amortizable intangible assets - net		3,906.1			47.9		—			3,954.0