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
Feb. 28, 2013
May 31, 2012
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 5,556.2 $ 4,544.2
Corporate investments 470.2 207.5
Long-term corporate investments 227.0 473.7
Total funds held for clients and corporate investments, Fair value 6,253.4 5,225.4
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (0.6) (0.3)
Less than twelve months, Fair value 121.5 180.0
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 1.1 0
Total, Gross unrealized losses (0.6) (0.3)
Total, Fair value 122.6 180.0
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (0.3) (0.2)
Less than twelve months, Fair value 55.1 124.4
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 0 0
Total, Gross unrealized losses (0.3) (0.2)
Total, Fair value 55.1 124.4
Pre-refunded municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0  
Less than twelve months, Fair value 3.1  
Twelve months or longer, Gross unrealized losses 0  
Twelve months or longer, Fair value 0  
Total, Gross unrealized losses 0  
Total, Fair value 3.1  
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (0.3) (0.1)
Less than twelve months, Fair value 63.3 55.6
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 1.1 0
Total, Gross unrealized losses (0.3) (0.1)
Total, Fair value $ 64.4 $ 55.6