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Accounts Receivable, Net (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Provision for discounts and doubtful accounts      
As at January 1, $ 31.1 $ 23.4  
Provision charged to operations 135.0 114.8  
Provision utilization (129.5) (109.4)  
As at June 30, 36.6 28.8  
Accounts receivable, net 815.4   845.0
Accounts receivable related to royalty income $ 64.4   $ 73.3