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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Financial Instruments [Abstract]  
Schedule of Foreign Exchange Contracts, Statement of Financial Position
 Fair valueFair value
  September 30,December 31,
  20122011
  $’M$’M
  __________________________
AssetsPrepaid expenses and other current assets1.13.4
LiabilitiesOther current liabilities0.80.4
  __________________________
Schedule of Foreign Exchange Contracts, Gain (Loss) in Other Income (Expense)
 Location of net gain recognized in incomeAmount of net gain recognized in income
 __________________________________________________________
Nine months to September 30,September 30,
  20122011
  $’M$’M
  __________________________
Foreign exchange contractsOther income, net9.510.5
  __________________________