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Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

7.  Intangible Assets

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

		Brokerage				Risk Management				Corporate				Total
At December 31, 2021
United States		$	4,409.1			$	64.8			$	—			$	4,473.9
United Kingdom			2,198.7				15.0				—				2,213.7
Canada			572.9				—				—				572.9
Australia			487.2				10.9				—				498.1
New Zealand			217.6				10.2				—				227.8
Other foreign			659.1				—				20.7				679.8
Total goodwill - net		$	8,544.6			$	100.9			$	20.7			$	8,666.2
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 - net		$	6,053.6			$	70.5			$	2.9			$	6,127.0

The changes in the carrying amount of goodwill for 2021 and 2020 are as follows (in millions):

		Brokerage				Risk Management				Corporate				Total
Balance as of December 31, 2019		$	5,548.9			$	66.6			$	3.0			$	5,618.5
Goodwill acquired during the year			359.6				—				—				359.6
Goodwill adjustments related to appraisals and other acquisition    adjustments			29.8				1.7				—				31.5
Foreign currency translation adjustments during the year			115.3				2.2				(0.1	)			117.4
Balance as of December 31, 2020			6,053.6				70.5				2.9				6,127.0
Goodwill acquired during the year			2,511.8				31.6				18.1				2,561.5
Goodwill adjustments related to appraisals and other acquisition    adjustments			50.8				—				—				50.8
Goodwill written-off related to sales of business			(1.0	)			—				—				(1.0	)
Foreign currency translation adjustments during the year			(70.6	)			(1.2	)			(0.3	)			(72.1	)
Balance as of December 31, 2021		$	8,544.6			$	100.9			$	20.7			$	8,666.2

Major classes of amortizable intangible assets consist of the following (in millions):

		December 31,
		2021				2020
Expiration lists		$	6,696.8			$	4,753.2
Accumulated amortization - expiration lists			(2,812.2	)			(2,436.7	)
			3,884.6				2,316.5
Non-compete agreements			76.0				75.9
Accumulated amortization - non-compete agreements			(62.8	)			(57.8	)
			13.2				18.1
Trade names			105.2				107.8
Accumulated amortization - trade names			(49.0	)			(42.5	)
			56.2				65.3
Net amortizable assets		$	3,954.0			$	2,399.9

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

2022		$	486.8
2023			461.6
2024			425.5
2025			385.6
2026			346.9
Thereafter			1,847.6
Total		$	3,954.0

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- References

No definition available.

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- Definition

The entire disclosure for goodwill and intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-URI http://asc.fasb.org/topic&trid=2144416

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