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Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provision for discounts and doubtful accounts
As at January 1,	$ 31.1	$ 23.4	$ 20.8
Provision charged to operations	283.3	240.8	178.1
Provision utilization	(272.7)	(233.1)	(175.5)
As at December 31,	41.7	31.1	23.4
Accounts receivable, net	824.2	845.0
Accounts receivable related to royalty income	$ 38.5	$ 73.3

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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