Settlement Assets and Obligations (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Contractual maturities of investment securities [Abstract]
Due within 1 year	$ 170.7
Due after 1 year through 5 years	688.7
Due after 5 years through 10 years	153.5
Due after 10 years	851.6
Total investment securities - Fair Value	$ 1,864.5

Amount of debt securities categorized neither as held-to-maturity nor trading.

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