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
Aug. 31, 2013
May 31, 2013
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 3,911.7 $ 4,072.5
Corporate investments 447.6 398.2
Long-term corporate investments 365.6 369.1
Total funds held for clients and corporate investments, Fair value 4,724.9 4,839.8
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (35.0) (5.7)
Less than twelve months, Fair value 1,299.6 577.6
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 4.1 2.1
Total, Gross unrealized losses (35.0) (5.7)
Total, Fair value 1,303.7 579.7
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (22.1) (3.5)
Less than twelve months, Fair value 775.9 349.2
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 2.0 0
Total, Gross unrealized losses (22.1) (3.5)
Total, Fair value 777.9 349.2
Pre-refunded municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0 0
Less than twelve months, Fair value 11.4 3.1
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 0 0
Total, Gross unrealized losses 0 0
Total, Fair value 11.4 3.1
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (12.9) (2.2)
Less than twelve months, Fair value 512.3 225.3
Twelve months or longer, Gross unrealized losses 0 0
Twelve months or longer, Fair value 2.1 2.1
Total, Gross unrealized losses (12.9) (2.2)
Total, Fair value $ 514.4 $ 227.4