4. Business Acquisitions, Goodwill and Intangible Assets

Consideration for business acquisitions during the nine months ended June 30, 2013 totaled $55.0 million in cash and $14.3 million in stock. Business acquisitions included South Africa-based BKS Group and Asia-based KPK Quantity Surveyors. These business acquisitions did not meet the quantitative thresholds, either individually or in the aggregate, to require pro forma disclosures of operating results based on the Company’s consolidated assets and income.

At the time of acquisition, the Company preliminarily estimates the amount of the identifiable intangible assets acquired based upon historical valuations of similar acquisitions and the facts and circumstances available at the time. The Company determines the final value of the identifiable intangible assets as soon as information is available, but not more than 12 months from the date of acquisition. Post-acquisition adjustments primarily relate to project related liabilities.

The changes in the carrying value of goodwill by reportable segment for the nine months ended June 30, 2013 and 2012 were as follows:

	September 30, 2012		Post- Acquisition Adjustments		Foreign Exchange Impact			Acquired		June 30, 2013
					(in millions)
Professional Technical Services	$	1,608.6	$	—	$	(43.4	)	$	65.3	$	1,630.5
Management Support Services	166.8		—		—			—		166.8
Total	$	1,775.4	$	—	$	(43.4	)	$	65.3	$	1,797.3

	September 30, 2011		Post- Acquisition Adjustments			Foreign Exchange Impact		Acquired		June 30, 2012
						(in millions)
Professional Technical Services	$	1,733.9	$	(0.3	)	$	5.5	$	10.7	$	1,749.8
Management Support Services	352.4		7.5			—		—		359.9
Total	$	2,086.3	$	7.2		$	5.5	$	10.7	$	2,109.7

The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of June 30, 2013 and September 30, 2012, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:

	June 30, 2013							September 30, 2012
	Gross		Accumulated			Intangible		Gross		Accumulated			Intangible		Amortization
	Amount		Amortization			Assets, Net		Amount		Amortization			Assets, Net		Period
	(in millions)														(years)
Backlog	$	94.9	$	(88.1	)	$	6.8	$	91.1	$	(83.8	)	$	7.3	1—5
Customer relationships	146.3		(65.7		)	80.6		143.6		(54.1		)	89.5		10
Trademark / tradename	7.8		(7.8		)	—		7.8		(7.6		)	0.2		2
Total	$	249.0	$	(161.6	)	$	87.4	$	242.5	$	(145.5	)	$	97.0

Amortization expense of acquired intangible assets included within cost of revenue was $16.1 million and $17.7 million for the nine months ended June 30, 2013 and 2012, respectively. The following table presents estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years:

Fiscal Year	(in millions)
2013 (three months remaining)	$	5.0
2014	18.6
2015	15.7
2016	13.0
2017	11.7
Thereafter	23.4
Total	$	87.4