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
May. 31, 2015
May. 31, 2014
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 1,430.0 $ 1,579.2
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains 0.0 0.0
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses 0.0 0.0
Funds held for clients money market securities and other cash equivalents, Fair value 1,430.0 1,579.2
Available-for-sale securities:    
Amortized cost 3,582.0 3,356.9
Gross unrealized gains 21.1 37.5
Gross unrealized losses (7.5) (3.0)
Fair value 3,595.6 3,391.4
Other, Amortized cost 12.7 10.6
Other, Gross unrealized gains 1.5 1.7
Other, Gross unrealized losses 0.0 0.0
Other, Fair value 14.2 12.3
Total funds held for clients and corporate investments, Amortized cost 5,024.7 4,946.7
Total funds held for clients and corporate investments, Gross unrealized gains 22.6 39.2
Total funds held for clients and corporate investments, Gross unrealized losses (7.5) (3.0)
Total funds held for clients and corporate investments, Fair value 5,039.8 4,982.9
General obligation municipal bonds [Member]    
Available-for-sale securities:    
Amortized cost 1,694.0 1,605.4
Gross unrealized gains 14.0 25.0
Gross unrealized losses (4.3) (1.9)
Fair value 1,703.7 1,628.5
Pre-refunded municipal bonds [Member]    
Available-for-sale securities:    
Amortized cost [1] 101.7 140.4
Gross unrealized gains [1] 1.0 2.4
Gross unrealized losses [1] 0.0 0.0
Fair value [1] 102.7 142.8
Revenue municipal bonds [Member]    
Available-for-sale securities:    
Amortized cost 960.7 858.8
Gross unrealized gains 6.1 10.1
Gross unrealized losses (3.2) (1.1)
Fair value 963.6 867.8
Variable rate demand notes [Member]    
Available-for-sale securities:    
Amortized cost 825.6 752.3
Gross unrealized gains 0.0 0.0
Gross unrealized losses 0.0 0.0
Fair value $ 825.6 $ 752.3
[1] (1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.