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Accounts Receivable, Net (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Provision for discounts and doubtful accounts      
As at January 1, $ 41.7 $ 31.1  
Provision charged to operations 150.8 135.0  
Provision utilization (150.7) (129.5)  
As at June 30, 41.8 36.6  
Accounts receivable, net 915.2   824.2
Accounts receivable related to royalty income $ 34.8   $ 38.5