Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

The carrying amount of goodwill at September 30, 2017 and December 31, 2016 allocated by domestic and foreign operations is as follows (in millions):

The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2017 are as follows (in millions):


	Brokerage		Risk Management		Corporate		Total

Balance as of December 31, 2016	$	3,736.9	$	28.1	$	2.8	$	3,767.8
Goodwill acquired during the period		214.0		14.1		—		228.1
Goodwill adjustments due to appraisals and other acquisition adjustments		14.4		—		—		14.4
Foreign currency translation adjustments during the period		149.2		0.8		0.1		150.1


Balance as of September 30, 2017	$	4,114.5	$	43.0	$	2.9	$	4,160.4

Major classes of amortizable intangible assets at September 30, 2017 and December 31, 2016 consist of the following (in millions):


	September 30,			December 31,
	2017			2016

Expiration lists	$	3,025.8		$	2,757.6
Accumulated amortization - expiration lists		(1,365.9	)		(1,143.0	)

		1,659.9			1,614.6

Non-compete agreements		53.3			49.3
Accumulated amortization - non-compete agreements		(45.7	)		(42.1	)

		7.6			7.2

Trade names		26.2			24.0
Accumulated amortization - trade names		(22.5	)		(18.5	)

		3.7			5.5

Net amortizable assets	$	1,671.2		$	1,627.3


Estimated aggregate amortization expense for each of the next five years is as follows:
2017 (remaining three months)	$	65.4
2018		253.8
2019		239.5
2020		222.8
2021		198.7


Total	$	980.2