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Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Provision for discounts and doubtful accounts
As at January 1,	$ 31.1	$ 23.4
Provision charged to operations	65.4	50.4
Provision utilization	(63.8)	(54.3)
As at December 31,	32.7	19.5
Accounts receivable, net	921.2		845.0
Accounts receivable related to royalty income	$ 54.8		$ 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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