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Accumulated Other Comprehensive Income (Tables)
9 Months Ended
Sep. 30, 2012
Comprehensive income note [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
 Foreign currency translation adjustment Unrealized 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 change5.0 7.2 12.2
As at September 30, 201266.4 6.1 72.5