Accounts Receivable, Net (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Provision for discounts and doubtful accounts
As at January 1,	$ 48.5	$ 47.9
Provision charged to operations	293.8	228.1
Provision utilization	(286.6)	(229.8)
As at September 30,	55.7	$ 46.2
Accounts receivable, net	1,296.0		$ 1,035.1
Accounts receivable related to royalty income	$ 71.4		$ 59.0