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Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Provision for discounts and doubtful accounts
As at January 1,	$ 41.7	$ 31.1
Provision charged to operations	76.3	65.4
Provision utilization	(73.3)	(63.8)
As at March 31,	44.7	32.7
Accounts receivable, net	884.4		824.2
Accounts receivable related to royalty income	$ 33.2		$ 38.5

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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