Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

The carrying amount of goodwill at June 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 six-month period ended June 30, 2017 are as follows (in millions):


			Risk
	Brokerage		Management		Corporate		Total

Balance as of December 31, 2016	$	3,736.9	$	28.1	$	2.8	$	3,767.8
Goodwill acquired during the period		142.7		11.7		—		154.4
Goodwill adjustments due to appraisals and other acquisition adjustments		14.7		—		—		14.7
Foreign currency translation adjustments during the period		51.7		0.3		0.1		52.1


Balance as of June 30, 2017	$	3,946.0	$	40.1	$	2.9	$	3,989.0

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


	June 30,			December 31,
	2017			2016

Expiration lists	$	2,928.6		$	2,757.6
Accumulated amortization - expiration lists		(1,278.5	)		(1,143.0	)

		1,650.1			1,614.6

Non-compete agreements		52.6			49.3
Accumulated amortization - non-compete agreements		(44.3	)		(42.1	)

		8.3			7.2

Trade names		24.8			24.0
Accumulated amortization - trade names		(20.6	)		(18.5	)

		4.2			5.5

Net amortizable assets	$	1,662.6		$	1,627.3

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