GOODWILL

The table below details changes in the goodwill balance:



$ in millions	Gross Book Value		Accumulated Impairment		Net Book Value
January 1, 2011	6,996.8		(16.6	)	6,980.2
Business combinations	30.5		—		30.5
Foreign exchange and other	(102.8	)	—		(102.8	)
December 31, 2011	6,924.5		(16.6	)	6,907.9

January 1, 2010	6,484.2		(16.6	)	6,467.6
Business combinations	440.0		—		440.0
Foreign exchange and other	72.6		—		72.6
December 31, 2010	6,996.8		(16.6	)	6,980.2

The 2010 acquisitions of Morgan Stanley's retail asset management business, including Van Kampen Investments, as well as the acquisitions of Concord Capital and AIG Asia Real Estate collectively added $399.6 million of goodwill to the company's Consolidated Balance Sheet at their respective acquisition dates. The 2011 earn-out calculations related to the 2006 acquisition of W.L. Ross & Co. and Invesco PowerShares resulted in an addition to goodwill of $30.5 million (2010 earn-out goodwill addition: $40.4 million).

The 2011 and 2010 annual impairment reviews determined that no impairment existed at the respective review dates. No interim impairment tests were deemed necessary during 2010 or 2011.