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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations

The carrying amount of goodwill at December 31, 2018 and 2017 allocated by domestic and foreign operations is as follows (in millions):

						Risk
		Brokerage				Management				Corporate				Total
At December 31, 2018
United States		$	2,715.3			$	29.6			$	—			$	2,744.9
United Kingdom			753.7				9.2				—				762.9
Canada			378.6				—				—				378.6
Australia			406.3				0.3				—				406.6
New Zealand			209.6				10.2				—				219.8
Other foreign			110.1				—				2.7				112.8
Total goodwill - net		$	4,573.6			$	49.3			$	2.7			$	4,625.6
At December 31, 2017
United States		$	2,280.9			$	25.8			$	—			$	2,306.7
United Kingdom			738.5				7.2				—				745.7
Canada			374.0				—				—				374.0
Australia			416.6				—				—				416.6
New Zealand			209.3				9.6				—				218.9
Other foreign			99.9				—				3.0				102.9
Total goodwill - net		$	4,119.2			$	42.6			$	3.0			$	4,164.8

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for 2018 and 2017 are as follows (in millions):

						Risk
		Brokerage				Management				Corporate				Total
Balance as of January 1, 2017, as reported		$	3,736.9			$	28.1			$	2.8			$	3,767.8
Adoption of Topic 606 related to 2016 acquisitions			(14.6	)			—				—				(14.6	)
Balance as of January 1, 2017, as restated			3,722.3				28.1				2.8				3,753.2
Goodwill acquired during the year			290.4				14.1				—				304.5
Adoption of Topic 606 related to 2017 acquisitions			(18.5	)			—				—				(18.5	)
Goodwill adjustments related to appraisals and other acquisition adjustments			14.7				—				—				14.7
Foreign currency translation adjustments during the year			110.3				0.4				0.2				110.9
Balance as of December 31, 2017, as restated			4,119.2				42.6				3.0				4,164.8
Goodwill acquired during the year			574.7				9.9				—				584.6
Goodwill adjustments related to appraisals and other acquisition adjustments			2.2				(2.3	)			—				(0.1	)
Foreign currency translation adjustments during the year			(122.5	)			(0.9	)			(0.3	)			(123.7	)
Balance as of December 31, 2018		$	4,573.6			$	49.3			$	2.7			$	4,625.6

Major Classes of Amortizable Intangible Assets

Major classes of amortizable intangible assets consist of the following (in millions):

		December 31,
		2018				2017
Expiration lists		$	3,379.4			$	3,055.9
Accumulated amortization - expiration lists			(1,676.8	)			(1,422.1	)
			1,702.6				1,633.8
Non-compete agreements			58.0				53.5
Accumulated amortization - non-compete agreements			(48.5	)			(46.1	)
			9.5				7.4
Trade names			86.0				25.9
Accumulated amortization - trade names			(25.1	)			(22.5	)
			60.9				3.4
Net amortizable assets		$	1,773.0			$	1,644.6

Estimated Aggregate Amortization Expense

Estimated aggregate amortization expense for each of the next five years is as follows (in millions):

2019		$	287.2
2020			270.7
2021			247.3
2022			222.2
2023			198.2
Thereafter			547.4
Total		$	1,773.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
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-Topic 350
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 350
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