Note 6: Goodwill and Other Intangible Assets

The following table summarizes the changes in the carrying amount of goodwill for the nine months ended September 30, 2018 (in millions):



	Americas			EMEA			APAC			Total
Balance as of December 31, 2017	$	1,249.7		$	249.0		$	266.6		$	1,765.3
Acquisitions	—			15.2			11.7			26.9
Measurement period adjustments	12.7			—			—			12.7
Effect of movements in exchange rates and other	(4.9		)	(8.5		)	(20.5		)	(33.9		)
Balance as of September 30, 2018	$	1,257.5		$	255.7		$	257.8		$	1,771.0

Portions of goodwill are denominated in currencies other than the U.S. dollar, therefore a portion of the movements in the reported book value of these balances is attributable to movements in foreign currency exchange rates.

The Company identified measurement period adjustments during the current period and adjusted the provisional goodwill amounts recognized.

There were no impairment charges of goodwill and other intangible assets for the three and nine months ended September 30, 2018 and 2017, respectively.

The following tables summarize the carrying amounts and accumulated amortization of intangible assets (in millions):



		As of September 30, 2018
	Useful Life (in years)	Gross Value		Accumulated Amortization			Net Value
C&W trade name	Indefinite	$	546.0	$	—		$	546.0
Customer relationships	1 – 15	1,203.0		(596.3		)	606.7
Other intangible assets	2 – 13	26.9		(13.1		)	13.8
Total intangible assets		$	1,775.9	$	(609.4	)	$	1,166.5

		As of December 31, 2017
	Useful Life (in years)	Gross Value		Accumulated Amortization			Net Value
C&W trade name	Indefinite	$	546.0	$	—		$	546.0
Customer relationships	1 – 15	1,211.5		(468.0		)	743.5
Other intangible assets	2 – 13	26.9		(10.4		)	16.5
Total intangible assets		$	1,784.4	$	(478.4	)	$	1,306.0

Amortization expense was $46.2 million and $45.3 million for the three months ended September 30, 2018 and 2017, respectively, and $139.3 million and $134.0 million for the nine months ended September 30, 2018 and 2017, respectively.