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, 2013
May 31, 2013
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 3,912.0 $ 4,072.5
Corporate investments 250.4 398.2
Long-term corporate investments 375.9 369.1
Total funds held for clients and corporate investments, Fair value 4,538.3 4,839.8
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (12.4) (5.7)
Less than twelve months, Fair value 766.5 577.6
Twelve months or longer, Gross unrealized losses (0.2) 0
Twelve months or longer, Fair value 11.8 2.1
Total, Gross unrealized losses (12.6) (5.7)
Total, Fair value 778.3 579.7
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (7.9) (3.5)
Less than twelve months, Fair value 453.9 349.2
Twelve months or longer, Gross unrealized losses (0.1) 0
Twelve months or longer, Fair value 4.7 0
Total, Gross unrealized losses (8.0) (3.5)
Total, Fair value 458.6 349.2
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 10.2 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 10.2 3.1
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (4.5) (2.2)
Less than twelve months, Fair value 302.4 225.3
Twelve months or longer, Gross unrealized losses (0.1) 0
Twelve months or longer, Fair value 7.1 2.1
Total, Gross unrealized losses (4.6) (2.2)
Total, Fair value $ 309.5 $ 227.4