Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2017

The carrying amount of goodwill at March 31, 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 three-month period ended March 31, 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		91.9		—		—		91.9
Goodwill adjustments due to appraisals and other acquisition adjustments		1.6		—		—		1.6
Foreign currency translation adjustments during the period		35.5		—		0.1		35.6


Balance as of March 31, 2017	$	3,865.9	$	28.1	$	2.9	$	3,896.9

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


	March 31, 2017			December 31, 2016

Expiration lists	$	2,880.5		$	2,757.6
Accumulated amortization - expiration lists		(1,210.1	)		(1,143.0	)

		1,670.4			1,614.6

Non-compete agreements		50.5			49.3
Accumulated amortization - non-compete agreements		(43.3	)		(42.1	)

		7.2			7.2

Trade names		24.4			24.0
Accumulated amortization - trade names		(19.9	)		(18.5	)

		4.5			5.5

Net amortizable assets	$	1,682.1		$	1,627.3

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