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Accumulated Other Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2012
Comprehensive income note [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
 Foreign currency translation adjustment Un-realized holding gain/(loss) on available for sale securities Accumulated other Comprehensive income
 $M $M $M
      
As at January 1, 201261.4 (1.1) 60.3
Current period change(17.7) 6.0 (11.7)
As at June 30, 201243.7 4.9 48.6