Annual report pursuant to Section 13 and 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
May 31, 2014
May 31, 2013
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 4,198.6 $ 4,072.5
Corporate investments 398.7 398.2
Long-term corporate investments 385.6 369.1
Total funds held for clients and corporate investments, Fair value 4,982.9 4,839.8
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (0.1) (5.7)
Less than twelve months, Fair value 118.8 577.6
Twelve months or longer, Gross unrealized losses (2.9) 0
Twelve months or longer, Fair value 276.4 2.1
Total, Gross unrealized losses 3.0 5.7
Total, Fair value 395.2 579.7
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (0.1) (3.5)
Less than twelve months, Fair value 69.6 349.2
Twelve months or longer, Gross unrealized losses (1.8) 0
Twelve months or longer, Fair value 164.0 0
Total, Gross unrealized losses 1.9 3.5
Total, Fair value 233.6 349.2
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 1.7 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 1.7 3.1
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0 (2.2)
Less than twelve months, Fair value 47.5 225.3
Twelve months or longer, Gross unrealized losses (1.1) 0
Twelve months or longer, Fair value 112.4 2.1
Total, Gross unrealized losses 1.1 2.2
Total, Fair value $ 159.9 $ 227.4