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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2012
Goodwill [Abstract]  
Schedule of 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