Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Provision for discounts and doubtful accounts
As at January 1,	$ 47.9	$ 41.7
Provision charged to operations	163.1	150.8
Provision utilization	(165.7)	(150.7)
As at June 30,	45.3	41.8
Accounts receivable, net	1,051.5		961.2
Accounts receivable related to royalty income	$ 29.4		$ 37.8