Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

The carrying amount of goodwill at June 30, 2020 and December 31, 2019 allocated by domestic and foreign operations is as follows (in millions):

The changes in the carrying amount of goodwill for the six-month period ended June 30, 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 period		190.5			—			—			190.5
Goodwill adjustments due to appraisals and other acquisition adjustments		27.9			1.3			—			29.2
Foreign currency translation adjustments during the period		(80.6	)		(1.0	)		(0.2	)		(81.8	)
Balance as of June 30, 2020	$	5,686.7		$	66.9		$	2.8		$	5,756.4

Major classes of amortizable intangible assets at June 30, 2020 and December 31, 2019 consist of the following (in millions):

	June 30,			December 31,
	2020			2019
Expiration lists	$	4,342.8		$	4,246.0
Accumulated amortization - expiration lists		(2,203.2	)		(2,004.3	)
		2,139.6			2,241.7
Non-compete agreements		67.0			68.4
Accumulated amortization - non-compete agreements		(54.0	)		(52.5	)
		13.0			15.9
Trade names		107.2			91.8
Accumulated amortization - trade names		(33.8	)		(30.7	)
		73.4			61.1
Net amortizable assets	$	2,226.0		$	2,318.7

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