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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations

The carrying amount of goodwill at June 30, 2018 and December 31, 2017 allocated by domestic and foreign operations is as follows (in millions):

		Brokerage				Risk Management				Corporate				Total
At June 30, 2018
United States		$	2,545.3			$	25.1			$	—			$	2,570.4
United Kingdom			732.1				7.1				—				739.2
Canada			360.0				—				—				360.0
Australia			400.7				—				—				400.7
New Zealand			204.5				10.4				—				214.9
Other foreign			115.9				—				2.8				118.7
Total goodwill - net		$	4,358.5			$	42.6			$	2.8			$	4,403.9

		Brokerage				Risk Management				Corporate				Total
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 the six-month period ended June 30, 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			291.8				2.7				—				294.5
Goodwill adjustments due to appraisals and other acquisition adjustments			2.5				(2.3	)			—				0.2
Foreign currency translation adjustments during the period			(55.0	)			(0.4	)			(0.2	)			(55.6	)
Balance as of June 30, 2018		$	4,358.5			$	42.6			$	2.8			$	4,403.9

Major Classes of Amortizable Intangible Assets

Major classes of amortizable intangible assets at June 30, 2018 and December 31, 2017 consist of the following (in millions):

		June 30, 2018				December 31, 2017
Expiration lists		$	3,233.4			$	3,055.9
Accumulated amortization - expiration lists			(1,547.5	)			(1,422.1	)
			1,685.9				1,633.8
Non-compete agreements			54.9				53.5
Accumulated amortization - non-compete agreements			(47.4	)			(46.1	)
			7.5				7.4
Trade names			60.6				25.9
Accumulated amortization - trade names			(23.0	)			(22.5	)
			37.6				3.4
Net amortizable assets		$	1,731.0			$	1,644.6

Estimated Aggregate Amortization Expense

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

2018 (remaining six months)		$	137.7
2019			263.9
2020			247.3
2021			224.0
2022			200.7
Thereafter			657.4
Total		$	1,731.0

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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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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