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 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2010
Aug. 31, 2011
Feb. 28, 2011
Jun. 30, 2010
Feb. 28, 2010
Aug. 31, 2011
Sub-facility Letters of Credit [Member]
Aug. 31, 2011
Tranche A Term Loans [Member]
May 31, 2011
Tranche B Term Loans [Member]
Aug. 31, 2011
Tranche B Term Loans [Member]
Aug. 31, 2011
2013 Tranche B Term Loan [Member]
Aug. 31, 2011
2015 Tranche B Term Loan [Member]
Aug. 31, 2011
Revolving Credit Facility [Member]
Aug. 31, 2011
2011 Revolving Facility [Member]
Aug. 31, 2011
2013 Revolving Facility [Member]
Borrowings (Textuals)                            
Maximum borrowing amount under credit facility   $ 3,842.0         $ 1,200.0   $ 1,800.0 $ 1,500.0 $ 300.0 $ 842.0 $ 192.0 $ 650.0
Maturity date of credit facility             2011-06     2013-06 2015-06   2011-06 2013-06
Repayment of Tranche B loan               400.0            
Outstanding letters of credit           12.8                
Revolving loans available to be drawn                         447.4  
Credit facilities under 2006 Credit Agreement           200.0                
Interest rate swap agreements designated as cash flow hedges   500.0 500.0 500.0 1,200.0                  
Undesignated interest rate swap agreements   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%