Quarterly report pursuant to Section 13 or 15(d)

Funds Held for Clients and Corporate Investments (Details)

 v2.3.0.11
Funds Held for Clients and Corporate Investments (Details) (USD $)
In Millions
Aug. 31, 2011
May 31, 2011
Type of issue:    
Money market securities and other cash equivalents, Amortized cost $ 1,396.3 $ 1,372.9
Money market securities and other cash equivalents, Fair value 1,396.3 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 69.7 59.4
Amortized cost 2,225.2 2,677.9
Gross unrealized losses 0 (0.1)
Fair value 2,294.9 2,737.2
Other, Amortized cost 8.7 8.3
Other, Gross unrealized gains 0.2 0.6
Other, Gross unrealized losses 0 0
Other, Fair value 8.9 8.9
Total funds held for clients and corporate investments, Amortized cost 3,630.2 4,059.1
Total funds held for clients and corporate investments, Gross unrealized gains 69.9 60.0
Total funds held for clients and corporate investments, Gross unrealized losses 0 (0.1)
Total funds held for clients and corporate investments, fair value 3,700.1 4,119.0
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss   (0.1)
Less than 12 months, Fair value   51.7
Classification of investments on the Consolidated Balance Sheets    
Funds held for clients 3,095.2 3,566.7
Corporate investments 372.0 345.0
Long-term corporate investments 232.9 207.3
Total funds held for clients and corporate investments, fair value 3,700.1 4,119.0
General obligation municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 41.4 33.1
Amortized cost 1,036.4 1,017.5
Gross unrealized losses 0 (0.1)
Fair value 1,077.8 1,050.5
Securities in an unrealized loss position    
Less than 12 months, Gross unrealized loss   (0.1)
Less than 12 months, Fair value   37.3
Pre-refunded municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 13.4 14.2
Amortized cost 437.9 470.5
Gross unrealized losses 0 0
Fair value 451.3 484.7
Revenue municipal bonds [Member]
   
Available-for-sale securities:    
Gross unrealized gains 14.9 12.1
Amortized cost 384.3 361.6
Gross unrealized losses 0 0
Fair value 399.2 373.7
Securities in an unrealized loss position    
Less than 12 months, Fair value   14.4
Variable rate demand notes [Member]
   
Available-for-sale securities:    
Gross unrealized gains 0 0
Amortized cost 366.6 828.3
Gross unrealized losses 0 0
Fair value $ 366.6 $ 828.3