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, 2014
May 31, 2013
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 4,916.8 $ 4,072.5
Corporate investments 314.4 398.2
Long-term corporate investments 377.8 369.1
Total funds held for clients and corporate investments, Fair value 5,609.0 4,839.8
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (3.3) (5.7)
Less than twelve months, Fair value 296.0 577.6
Twelve months or longer, Gross unrealized losses (0.6) 0
Twelve months or longer, Fair value 49.5 2.1
Total, Gross unrealized losses (3.9) (5.7)
Total, Fair value 345.5 579.7
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (2.2) (3.5)
Less than twelve months, Fair value 188.9 349.2
Twelve months or longer, Gross unrealized losses (0.3) 0
Twelve months or longer, Fair value 17.4 0
Total, Gross unrealized losses (2.5) (3.5)
Total, Fair value 206.3 349.2
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 9.1 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 9.1 3.1
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (1.1) (2.2)
Less than twelve months, Fair value 98.0 225.3
Twelve months or longer, Gross unrealized losses (0.3) 0
Twelve months or longer, Fair value 32.1 2.1
Total, Gross unrealized losses (1.4) (2.2)
Total, Fair value $ 130.1 $ 227.4