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Goodwill
 12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Goodwill

The table below details changes in the goodwill balance:
$ in millions
Gross Book Value
 
Accumulated Impairment
 
Net Book Value
January 1, 2012
6,924.5

 
(16.6
)
 
6,907.9

Business combinations
17.3

 
—

 
17.3

Foreign exchange and other
123.0

 
—

 
123.0

December 31, 2012
7,064.8

 
(16.6
)
 
7,048.2

 
 
 
 
 
 
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



The 2012 earn-outs related to the 2006 acquisitions of W.L. Ross & Co. and Invesco PowerShares represent the final earn-out payments related to these acquisitions, and resulted in an addition to goodwill of $17.3 million (2011 earn-out goodwill addition: $30.5 million).

The 2012 and 2011 annual impairment reviews determined that no impairment existed at the respective review dates. No interim impairment tests were deemed necessary during 2011 or 2012.