Other Intangible Assets, Net (Roll Forward) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Intangible Assets Roll Forward
As at January 1,			$ 2,388.1	$ 2,493.0
Acquisitions			733.2	281.5
Amortization charged			(136.1)	(147.3)
Impairment charges	(19.9)	(27.0)	(19.9)	(27.0)
Foreign currency translation			10.7	(6.6)
As at September 30,	$ 2,976.0	$ 2,593.6	$ 2,976.0	$ 2,593.6