Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Short-term Debt) (Details Textual)

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Borrowings (Short-term Debt) (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
May 31, 2012
Apr. 30, 2012
Feb. 29, 2012
Borrowings (Textual)      
Maximum borrowing amount under credit facility $ 1,650.0    
Cash Flow Hedge Gain (Loss) Reclassified to Interest Expense, Net 2.1    
Interest rate swap agreements designated as cash flow hedges 500.0 500.0 500.0
Undesignated interest rate swap agreements 1,000.0 500.0  
Average interest rate   2.80%  
Sub-facility Letters of Credit [Member]
     
Borrowings (Textual)      
Maximum borrowing amount under credit facility 200.0    
Letters of Credit Outstanding, Amount 13.4    
Revolving Credit Facility [Member]
     
Borrowings (Textual)      
Maximum borrowing amount under credit facility 850.0    
Senior notes outstanding 26.2    
Credit Facility, interest rate 4.00%    
LIBOR margin 0.00%    
Remaining Borrowing Capacity $ 810.4    
Debt Instrument, Maturity Date May 03, 2017