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Business Combination and Integration (Tables)
 12 Months Ended
Dec. 31, 2012
BUSINESS COMBINATIONS AND INTEGRATION [Abstract]  
Acquisition-related and integration-related charges
The following table presents acquisition-related and integration-related charges incurred during the period.
 
For the year ended December 31,
$ in millions
2012
 
2011
 
2010
Acquisition-related charges
—

 
—

 
5.7

Integration-related charges:
 
 
 
 
 
    Staff costs
0.1

 
2.8

 
39.1

    Technology, contractor and related costs
0.6

 
11.0

 
53.4

    Professional services
7.5

 
15.6

 
51.8

Total integration-related charges
8.2

 
29.4

 
144.3

Total transaction and integration charges
8.2

 
29.4

 
150.0