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Accumulated Other Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 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 change36.6 2.9 39.5
As at March 31, 201298.0 1.8 99.8