Annual report pursuant to Section 13 and 15(d)

Funds Held for Clients and Corporate Investments (Details 1)

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Funds Held for Clients and Corporate Investments (Details 1) (USD $)
In Millions, unless otherwise specified
May 31, 2012
May 31, 2011
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 4,544.2 $ 3,566.7
Corporate investments 207.5 345.0
Long-term corporate investments 473.7 207.3
Total funds held for clients and corporate investments, Fair value 5,225.4 4,119.0
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses (0.3) (0.1)
Less than 12 months, Fair value 180.0 51.7
General obligation municipal bonds [Member]
   
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses (0.2) (0.1)
Less than 12 months, Fair value 124.4 37.3
Revenue municipal bonds [Member]
   
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses (0.1)   
Less than 12 months, Fair value $ 55.6 $ 14.4