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. 29, 2012
May 31, 2011
Type of issue:    
Money market securities and other cash equivalents, Amortized cost $ 1,190.8 $ 1,372.9
Money market securities and other cash equivalents, Gross unrealized gains 0 0
Money market securities and other cash equivalents, Gross unrealized losses 0 0
Money market securities and other cash equivalents, Fair value 1,190.8 1,372.9
Available-for-sale securities:    
Amortized cost 3,551.0 2,677.9
Gross unrealized gains 68.2 59.4
Gross unrealized losses (0.1) (0.1)
Fair value 3,619.1 2,737.2
Other, Amortized cost 8.7 8.3
Other, Gross unrealized gains 0.6 0.6
Other, Gross unrealized losses 0 0
Other, Fair value 9.3 8.9
Total funds held for clients and corporate investments, Amortized cost 4,750.5 4,059.1
Total funds held for clients and corporate investments, Gross unrealized gains 68.8 60.0
Total funds held for clients and corporate investments, Gross unrealized losses (0.1) (0.1)
Total funds held for clients and corporate investments, fair value 4,819.2 4,119.0
General obligation municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 1,056.7 1,017.5
Gross unrealized gains 43.2 33.1
Gross unrealized losses (0.1) (0.1)
Fair value 1,099.8 1,050.5
Pre-refunded municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 355.9 470.5
Gross unrealized gains 9.8 14.2
Gross unrealized losses 0 0
Fair value 365.7 484.7
Revenue municipal bonds [Member]
    
Available-for-sale securities:    
Amortized cost 401.2 361.6
Gross unrealized gains 15.2 12.1
Gross unrealized losses 0 0
Fair value 416.4 373.7
Variable rate demand notes [Member]
    
Available-for-sale securities:    
Amortized cost 1,737.2 828.3
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value $ 1,737.2 $ 828.3