Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Provision for discounts and doubtful accounts
As at January 1,	$ 47.9	$ 41.7
Provision charged to operations	228.1	225.3
Provision utilization	(229.8)	(215.4)
As at September 30,	46.2	51.6
Accounts receivable, net	1,079.3		961.2
Accounts receivable related to royalty income	$ 36.0		$ 37.8