Quarterly report pursuant to Section 13 or 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
Nov. 30, 2012
May 31, 2012
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 3,715.5 $ 4,544.2
Corporate investments 178.6 207.5
Long-term corporate investments 504.3 473.7
Total funds held for clients and corporate investments, Fair value 4,398.4 5,225.4
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses (0.1) (0.3)
Less than 12 months, Fair value 57.7 180.0
General obligation municipal bonds [Member]
   
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses (0.1) (0.2)
Less than 12 months, Fair value 30.6 124.4
Pre-refunded municipal bonds [Member]
   
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses 0 0
Less than 12 months, Fair value 3.2 0
Revenue municipal bonds [Member]
   
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized losses 0 (0.1)
Less than 12 months, Fair value $ 23.9 $ 55.6