Other Intangible Assets, Net (Roll Forward) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Other Intangible Assets [Roll Forward]
As at January 1,	$ 2,493.0	$ 1,978.9
Acquisitions	281.5	717.1
Amortization charged	(147.3)	(120.5)
Impairment charges	(27.0)	(16.0)
Foreign currency translation	(6.6)	2.2
As at September 30,	$ 2,593.6	$ 2,561.7