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
Nov. 30, 2012
May 31, 2012
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 1,380.1 $ 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 1,380.1 2,157.2
Available-for-sale securities:    
Amortized cost 2,945.0 2,999.5
Gross unrealized gains 63.0 59.8
Gross unrealized losses (0.1) (0.3)
Total, Fair value 3,007.9 3,059.0
Other, Amortized cost 9.6 8.8
Other, Gross unrealized gains 0.8 0.5
Other, Gross unrealized losses 0 (0.1)
Other, Fair value 10.4 9.2
Total funds held for clients and corporate investments, Amortized cost 4,334.7 5,165.5
Total funds held for clients and corporate investments, Gross unrealized gains 63.8 60.3
Total funds held for clients and corporate investments, Gross unrealized losses (0.1) (0.4)
Total funds held for clients and corporate investments, Fair value 4,398.4 5,225.4
General obligation municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 1,370.0 1,295.0
Gross unrealized gains 40.9 39.1
Gross unrealized losses (0.1) (0.2)
Total, Fair value 1,410.8 1,333.9
Pre-refunded municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 229.2 [1] 326.8 [1]
Gross unrealized gains 5.3 [1] 7.5 [1]
Gross unrealized losses 0 [1] 0 [1]
Total, Fair value 234.5 [1] 334.3 [1]
Revenue municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 622.0 487.9
Gross unrealized gains 16.8 13.2
Gross unrealized losses 0 (0.1)
Total, Fair value 638.8 501.0
Variable rate demand notes [Member]
    
Available-for-sale securities:    
Amortized cost 723.8 889.8
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Total, Fair value $ 723.8 $ 889.8
[1] Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.