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Reorganization Costs (Tables)
12 Months Ended
Dec. 31, 2011
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring Reserve
     
    Closing
 Opening liabilityAmount liability at
 at January 1,charged to re- December 31,
 2011organizationPaid/Utilized2011
 $'M$'M$'M$'M
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Involuntary termination benefits 10.112.8(14.2)8.7
Other reorganization costs 2.311.5(13.7)0.1
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 12.424.3(27.9)8.8
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