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, 2014
May 31, 2014
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 4,066.8 $ 4,198.6
Corporate investments 96.7 398.7
Long-term corporate investments 396.5 385.6
Total funds held for clients and corporate investments, Fair value 4,560.0 4,982.9
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0 (0.1)
Less than twelve months, Fair value 58.3 118.8
Twelve months or longer, Gross unrealized losses (1.3) (2.9)
Twelve months or longer, Fair value 208.4 276.4
Total, Gross unrealized losses (1.3) (3.0)
Total, Fair value 266.7 395.2
General obligation municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0 (0.1)
Less than twelve months, Fair value 16.3 69.6
Twelve months or longer, Gross unrealized losses (1.0) (1.8)
Twelve months or longer, Fair value 126.5 164.0
Total, Gross unrealized losses (1.0) (1.9)
Total, Fair value 142.8 233.6
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 1.7
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 1.7
Revenue municipal bonds [Member]
    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses 0 0
Less than twelve months, Fair value 40.3 47.5
Twelve months or longer, Gross unrealized losses (0.3) (1.1)
Twelve months or longer, Fair value 81.9 112.4
Total, Gross unrealized losses (0.3) (1.1)
Total, Fair value $ 122.2 $ 159.9