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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014
6,867.3

 
—

 
6,867.3

Foreign exchange and other
(287.9
)
 
—

 
(287.9
)
December 31, 2014
6,579.4

 
—

 
6,579.4

 
 
 
 
 
 
January 1, 2013
7,064.8

 
(16.6
)
 
7,048.2

Dispositions
(91.1
)
 
16.6

 
(74.5
)
Foreign exchange and other
(106.4
)
 
—

 
(106.4
)
December 31, 2013
6,867.3

 
—

 
6,867.3