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Other Intangible Assets, Net (Roll Forward) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Other Intangible Assets [Roll Forward]    
As at January 1, $ 2,493.0 $ 1,978.9
Acquisitions 272.5 711.5
Amortization charged (97.3) (73.6)
Impairment charges (27.0) 0
Foreign currency translation (15.6) 62.6
As at June 30, $ 2,625.6 $ 2,679.4