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, 2011
May 31, 2011
Type of issue:    
Money market securities and other cash equivalents, Amortized cost $ 852.9 $ 1,372.9
Money market securities and other cash equivalents, Fair value 852.9 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
Available-for-sale securities:    
Gross unrealized gains 54.0 59.4
Amortized cost 2,697.4 2,677.9
Gross unrealized losses (0.3) (0.1)
Fair value 2,751.1 2,737.2
Other, Amortized cost 8.8 8.3
Other, Gross unrealized gains 0.3 0.6
Other, Gross unrealized losses (0.1) 0
Other, Fair value 9.0 8.9
Total funds held for clients and corporate investments, Amortized cost 3,559.1 4,059.1
Total funds held for clients and corporate investments, Gross unrealized gains 54.3 60.0
Total funds held for clients and corporate investments, Gross unrealized losses (0.4) (0.1)
Total funds held for clients and corporate investments, fair value 3,613.0 4,119.0
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss (0.3) (0.1)
Less than 12 months, Fair value 79.7 51.7
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients 3,032.8 3,566.7
Corporate investments 315.0 345.0
Long-term corporate investments 265.2 207.3
Total funds held for clients and corporate investments, fair value 3,613.0 4,119.0
General obligation municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 32.4 33.1
Amortized cost 1,067.7 1,017.5
Gross unrealized losses (0.2) (0.1)
Fair value 1,099.9 1,050.5
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss (0.2) (0.1)
Less than 12 months, Fair value 41.7 37.3
Pre-refunded municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 10.2 14.2
Amortized cost 395.8 470.5
Gross unrealized losses 0 0
Fair value 406.0 484.7
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss 0 0
Less than 12 months, Fair value 1.6 0
Revenue municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 11.4 12.1
Amortized cost 394.0 361.6
Gross unrealized losses (0.1) 0
Fair value 405.3 373.7
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss (0.1) 0
Less than 12 months, Fair value 36.4 14.4
Variable rate demand notes [Member]
   
Available-for-sale securities:    
Gross unrealized gains 0 0
Amortized cost 839.9 828.3
Gross unrealized losses 0 0
Fair value $ 839.9 $ 828.3