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
Feb. 28, 2013
May 31, 2012
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 1,369.4 $ 2,157.2
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains 0 0
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses 0 0
Funds held for clients money market securities and other cash equivalents, Fair value 1,369.4 2,157.2
Available-for-sale securities:    
Amortized cost 4,821.8 2,999.5
Gross unrealized gains 52.5 59.8
Gross unrealized losses (0.6) (0.3)
Total, Fair value 4,873.7 3,059.0
Other, Amortized cost 9.4 8.8
Other, Gross unrealized gains 0.9 0.5
Other, Gross unrealized losses 0 (0.1)
Other, Fair value 10.3 9.2
Total funds held for clients and corporate investments, Amortized cost 6,200.6 5,165.5
Total funds held for clients and corporate investments, Gross unrealized gains 53.4 60.3
Total funds held for clients and corporate investments, Gross unrealized losses (0.6) (0.4)
Total funds held for clients and corporate investments, Fair value 6,253.4 5,225.4
General obligation municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 1,345.8 1,295.0
Gross unrealized gains 34.7 39.1
Gross unrealized losses (0.3) (0.2)
Total, Fair value 1,380.2 1,333.9
Pre-refunded municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 207.5 [1] 326.8 [1]
Gross unrealized gains 3.9 [1] 7.5 [1]
Gross unrealized losses 0 [1] 0 [1]
Total, Fair value 211.4 [1] 334.3 [1]
Revenue municipal bonds [Member]
   
Available-for-sale securities:    
Amortized cost 668.4 487.9
Gross unrealized gains 13.9 13.2
Gross unrealized losses (0.3) (0.1)
Total, Fair value 682.0 501.0
Variable rate demand notes [Member]
   
Available-for-sale securities:    
Amortized cost 2,600.1 889.8
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total, Fair value $ 2,600.1 $ 889.8
[1] Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.