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, 2014
May 31, 2014
Type of issue:    
Funds held for clients money market securities and other cash equivalents, Amortized cost $ 1,779.1 $ 1,579.2
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 1,779.1 1,579.2
Available-for-sale securities:    
Amortized cost 2,726.1 3,356.9
Gross unrealized gains 42.3 37.5
Gross unreailzed losses (1.3) (3.0)
Fair value 2,767.1 3,391.4
Other, Amortized cost 11.9 10.6
Other, Gross unrealized gains 1.9 1.7
Other, Gross unrealized losses 0 0
Other, Fair value 13.8 12.3
Total funds held for clients and corporate investments, Amortized cost 4,517.1 4,946.7
Total funds held for clients and corporate investments, Gross unrealized gains 44.2 39.2
Total funds held for clients and corporate investments, Gross unrealized losses (1.3) (3.0)
Total funds held for clients and corporate investments, Fair value 4,560.0 4,982.9
General obligation municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 1,638.3 1,605.4
Gross unrealized gains 27.2 25.0
Gross unreailzed losses (1.0) (1.9)
Fair value 1,664.5 1,628.5
Pre-refunded municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 121.6 [1] 140.4 [1]
Gross unrealized gains 2.6 [1] 2.4 [1]
Gross unreailzed losses 0 [1] 0 [1]
Fair value 124.2 [1] 142.8 [1]
Revenue municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 920.5 858.8
Gross unrealized gains 12.5 10.1
Gross unreailzed losses (0.3) (1.1)
Fair value 932.7 867.8
Variable rate demand notes [Member]
    
Available-for-sale securities:    
Amortized cost 45.7 752.3
Gross unrealized gains 0 0
Gross unreailzed losses 0 0
Fair value $ 45.7 $ 752.3
[1] Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.