Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

The carrying amount of goodwill at March 31, 2018 and December 31, 2017 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, 2018 are as follows (in millions):


	Brokerage			Risk Management			Corporate			Total

Balance as of December 31, 2017, as previously reported	$	4,152.3		$	42.6		$	3.0		$	4,197.9
Adoption of ASC Topic 606		(33.1	)		—			—			(33.1	)

Balance at December 31, 2017, as restated		4,119.2			42.6			3.0		$	4,164.8
Goodwill acquired during the period		38.3			2.7			—			41.0
Goodwill adjustments due to appraisals and other acquisition adjustments		1.9			(2.3	)		—			(0.4	)
Foreign currency translation adjustments during the period		30.4			0.6			(0.1	)		30.9


Balance as of March 31, 2018	$	4,189.8		$	43.6		$	2.9		$	4,236.3

Major classes of amortizable intangible assets at March 31, 2018 and December 31, 2017 consist of the following (in millions):


	March 31, 2018			December 31, 2017
Expiration lists	$	3,128.1		$	3,055.9
Accumulated amortization - expiration lists		(1,498.4	)		(1,422.1	)

		1,629.7			1,633.8

Non-compete agreements		54.3			53.5
Accumulated amortization - non-compete agreements		(47.3	)		(46.1	)

		7.0			7.4

Trade names		26.3			25.9
Accumulated amortization - trade names		(23.4	)		(22.5	)

		2.9			3.4

Net amortizable assets	$	1,639.6		$	1,644.6

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