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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basis of Presentation    
Amortization of initial payments for new contracts $ 10.2 $ 9.8
Amortization related to equity method investments 19.7 30.5
Revenue Recognition    
Interchange fees and assessments 4,510.6 4,285.1
Debit network fees $ 697.2 $ 663.4