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Intangible Assets (Roll Forward) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Intangible Assets Roll Forward      
As at January 1, $ 9,173.3 $ 4,934.4  
Acquisitions 27,462.8 5,474.9  
Amortization charged (1,173.4) (498.7) $ (243.8)
Impairment charges (8.9) (643.7) (190.3)
Foreign currency translation (756.3) (93.6)  
As at December 31, $ 34,697.5 $ 9,173.3 $ 4,934.4