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
May. 31, 2015
May. 31, 2014
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients $ 4,273.4 $ 4,198.6
Corporate investments 366.6 398.7
Long-term corporate investments 399.8 385.6
Total funds held for clients and corporate investments, Fair value 5,039.8 4,982.9
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (7.0) (0.1)
Less than twelve months, Fair value 896.7 118.8
Twelve months or longer, Gross unrealized losses (0.5) (2.9)
Twelve months or longer, Fair value 26.3 276.4
Total, Gross unrealized losses (7.5) (3.0)
Total, Fair value 923.0 395.2
General obligation municipal bonds [Member]    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (3.8) (0.1)
Less than twelve months, Fair value 535.1 69.6
Twelve months or longer, Gross unrealized losses (0.5) (1.8)
Twelve months or longer, Fair value 26.3 164.0
Total, Gross unrealized losses (4.3) (1.9)
Total, Fair value 561.4 233.6
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
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
Revenue municipal bonds [Member]    
Securities in an unrealized loss position    
Less than twelve months, Gross unrealized losses (3.2) 0.0
Less than twelve months, Fair value 361.6 47.5
Twelve months or longer, Gross unrealized losses 0.0 (1.1)
Twelve months or longer, Fair value 0.0 112.4
Total, Gross unrealized losses (3.2) (1.1)
Total, Fair value $ 361.6 $ 159.9