Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Provision for discounts and doubtful accounts
As at January 1,	$ 47.9	$ 41.7
Provision charged to operations	80.7	76.3
Provision utilization	(81.2)	(73.3)
As at March 31,	47.4	44.7
Accounts receivable, net	1,091.2		961.2
Accounts receivable related to royalty income	$ 37.2		$ 37.8