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Settlement Assets and Obligations (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available-for-sale investment securities [Abstract]    
Amortized Cost $ 1,851.8 $ 1,324.1
Fair Value 1,864.5 1,332.0
Gross Unrealized Gains 13.0 11.0
Gross Unrealized Losses (0.3) (3.1)
Net Unrealized Gains/(Losses) 12.7 7.9
State and municipal debt securities [Member]
   
Available-for-sale investment securities [Abstract]    
Amortized Cost 820.1 [1] 858.5 [1]
Fair Value 832.3 [1] 866.5 [1]
Gross Unrealized Gains 12.5 [1] 10.4 [1]
Gross Unrealized Losses (0.3) [1] (2.4) [1]
Net Unrealized Gains/(Losses) 12.2 [1] 8.0 [1]
State and municipal variable rate demand notes [Member]
   
Available-for-sale investment securities [Abstract]    
Amortized Cost 975.2 376.9
Fair Value 975.2 376.9
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Net Unrealized Gains/(Losses) 0 0
Corporate debt and other [Member]
   
Available-for-sale investment securities [Abstract]    
Amortized Cost 56.5 88.7
Fair Value 57.0 88.6
Gross Unrealized Gains 0.5 0.6
Gross Unrealized Losses 0 (0.7)
Net Unrealized Gains/(Losses) $ 0.5 $ (0.1)
[1] The majority of these securities are fixed-rate instruments.