Annual report pursuant to Section 13 and 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
May 31, 2012
May 31, 2011
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 2,157.2 $ 1,372.9
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 2,157.2 1,372.9
Available-for-sale securities:    
Amortized cost 2,999.5 2,677.9
Gross unrealized gains 59.8 59.4
Gross unrealized losses (0.3) (0.1)
Fair value 3,059.0 2,737.2
Other, Amortized cost 8.8 8.3
Other, Gross unrealized gains 0.5 0.6
Other, Gross unrealized losses (0.1)   
Other, Fair value 9.2 8.9
Total funds held for clients and corporate investments, Amortized cost 5,165.5 4,059.1
Total funds held for clients and corporate investments, Gross unrealized gains 60.3 60.0
Total funds held for clients and corporate investments, Gross unrealized losses (0.4) (0.1)
Total funds held for clients and corporate investments, Fair value 5,225.4 4,119.0
General obligation municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 1,295.0 1,017.5
Gross unrealized gains 39.1 33.1
Gross unrealized losses (0.2) (0.1)
Fair value 1,333.9 1,050.5
Pre-refunded municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 326.8 470.5
Gross unrealized gains 7.5 14.2
Gross unrealized losses      
Fair value 334.3 484.7
Revenue municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 487.9 361.6
Gross unrealized gains 13.2 12.1
Gross unrealized losses (0.1)   
Fair value 501.0 373.7
Variable rate demand notes [Member]
   
Available-for-sale securities:    
Amortized cost 889.8 828.3
Gross unrealized gains      
Gross unrealized losses      
Fair value $ 889.8 $ 828.3