Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2022

The carrying amount of goodwill at March 31, 2022 and December 31, 2021 allocated by domestic and foreign operations is as follows (in millions):

The changes in the carrying amount of goodwill for the three-month period ended March 31, 2022 are as follows (in millions):

	Brokerage			Risk Management		Corporate			Total
Balance as of December 31, 2021	$	8,544.6		$	100.9	$	20.7		$	8,666.2
Goodwill acquired during the period		68.9			—		—			68.9
Goodwill true-ups due to appraisals and other acquisition adjustments		(18.8	)		—		—			(18.8	)
Foreign currency translation adjustments during the period		11.0			0.5		(0.1	)		11.4
Balance as of March 31, 2022	$	8,605.7		$	101.4	$	20.6		$	8,727.7

Major classes of amortizable intangible assets at March 31, 2022 and December 31, 2021 consist of the following (in millions):

	March 31,			December 31,
	2022			2021
Expiration lists	$	6,749.3		$	6,696.8
Accumulated amortization - expiration lists		(2,941.1	)		(2,812.2	)
		3,808.2			3,884.6
Non-compete agreements		78.5			76.0
Accumulated amortization - non-compete agreements		(64.4	)		(62.8	)
		14.1			13.2
Trade names		106.1			105.2
Accumulated amortization - trade names		(50.8	)		(49.0	)
		55.3			56.2
Net amortizable assets	$	3,877.6		$	3,954.0

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