Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Details)

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Funds Held for Clients and Corporate Investments (Details) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2012
May 31, 2012
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 1,000.3 $ 2,157.2
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains      
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses      
Funds held for clients money market securities and other cash equivalents, Fair value 1,000.3 2,157.2
Available-for-sale securities:    
Amortized cost 3,349.1 2,999.5
Gross unrealized gains 59.2 59.8
Gross unrealized losses (0.4) (0.3)
Total, Fair value 3,407.9 3,059.0
Other, Amortized cost 9.5 8.8
Other, Gross unrealized gains 0.7 0.5
Other, Gross unrealized losses    (0.1)
Other, Fair value 10.2 9.2
Total funds held for clients and corporate investments, Amortized cost 4,358.9 5,165.5
Total funds held for clients and corporate investments, Gross unrealized gains 59.9 60.3
Total funds held for clients and corporate investments, Gross unrealized losses (0.4) (0.4)
Total funds held for clients and corporate investments, Fair value 4,418.4 5,225.4
General obligation municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 1,372.7 1,295.0
Gross unrealized gains 38.9 39.1
Gross unrealized losses (0.3) (0.2)
Total, Fair value 1,411.3 1,333.9
Pre-refunded municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 235.5 326.8
Gross unrealized gains 6.5 7.5
Gross unrealized losses      
Total, Fair value 242.0 334.3
Revenue municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 587.5 487.9
Gross unrealized gains 13.8 13.2
Gross unrealized losses (0.1) (0.1)
Total, Fair value 601.2 501.0
Variable rate demand notes [Member]
   
Available-for-sale securities:    
Amortized cost 1,153.4 889.8
Gross unrealized gains      
Gross unrealized losses      
Total, Fair value $ 1,153.4 $ 889.8