Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details Textual)

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Borrowings (Details Textual) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2010
Nov. 30, 2011
Nov. 30, 2011
Feb. 28, 2011
Jun. 30, 2010
Feb. 28, 2010
Borrowings (Textual)            
Maximum borrowing amount under credit facility   $ 3,842.0 $ 3,842.0      
Interest rate swap agreements designated as cash flow hedges   500.0 500.0 500.0 500.0 1,200.0
Undesignated interest rate swap agreements   0 0 0   2,400.0
Payment of interest rate swap agreements 11.9          
Term of delayed start interest rate swap agreement, years         5 years  
Average interest rate         2.90%  
Net gains (losses) reclassified from AOCI to interest expense   2.0 2.0      
Notes Payable to Banks, Total   352.3 352.3 83.7    
Senior Credit Facility - Revolving Credit Loans [Member]
            
Borrowings (Textual)            
Maximum borrowing amount under credit facility   842.0 842.0      
Notes Payable to Banks, Total   247.0 247.0 74.9    
Sub-facility Letters of Credit [Member]
            
Borrowings (Textual)            
Maximum borrowing amount under credit facility   200.0 200.0      
Outstanding letters of credit   12.2 12.2      
2011 Revolving Facility [Member]
            
Borrowings (Textual)            
Maximum borrowing amount under credit facility   192.0 192.0      
Maturity date of credit facility     2011-06      
2013 Revolving Facility [Member]
            
Borrowings (Textual)            
Maximum borrowing amount under credit facility   650.0 650.0      
Maturity date of credit facility     2013-06      
Revolving loans available to be drawn   390.8 390.8      
Credit facility, interest rate   2.70% 2.70%      
Senior notes outstanding   $ 247.0 $ 247.0