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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments under Operating Leases
  Operating
  leases
  $’M
  _____________
2012 43.5
2013 33.5
2014 28.1
2015 21.3
2016 15.1
Thereafter 41.4
  _____________
  182.9
  _____________