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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Cash and Cash Equivalents      
Cash and Cash Equivalents, Maximum Maturity Period   3 months  
Line of Credit Maturity Period   90 days  
Foreign currency translation gain $ 102.7 $ 91.3  
Advertising costs $ 158.0 $ 145.8 $ 133.8