Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

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Fair Value of Financial Instruments (Details) (USD $)
In Millions, unless otherwise specified
May 31, 2013
Feb. 28, 2013
May 31, 2012
Feb. 29, 2012
Assets:        
Cash and cash investments, Carrying Amount $ 609.3 $ 331.5 $ 69.1 $ 85.8
Cash and cash investments, Fair Value 609.3 331.5    
Accounts receivable, net, Carrying Amount 453.8 471.9    
Accounts receivable, net, Fair Value 453.8 471.9    
Restricted cash, Carrying Amount 1,550.0 0    
Restricted cash, Fair Value 1,550.0 0    
Available-for-sale debt securities, Carrying Amount 34.3 34.2    
Available-for-sale debt securities, Fair Value 34.3 34.2    
Foreign currency contracts, Carrying Amount 6.8 9.7    
Foreign currency contracts, Fair Value 6.8 9.7    
Interest rate swap contracts, Carrying Amount 4.5 6.6    
Interest rate swap contracts, Fair Value 4.5 6.6    
Diesel fuel swap contracts, Carrying Value 0.1 0.6    
Diesel fuel swap contracts, Fair Value 0.1 0.6    
Liabilities:        
Notes payable to banks 221.0 0    
Notes payable to banks, Fair Value 221.0 0    
Accounts payable, Carrying Amount 150.0 209.0    
Accounts payable, Fair Value 150.0 209.0    
Long-term debt, including current portion, Carrying Amount 4,851.0 3,305.4    
Long-term debt, including current portion, Fair Value 5,160.8 3,603.6    
Foreign currency contracts, Carrying Amount 3.2 5.3    
Foreign currency contracts, Fair Value 3.2 5.3    
Interest rate swap contracts, Carrying Amount 42.5 47.1    
Interest rate swap contracts, Fair Value 42.5 47.1    
Diesel fuel swap contracts, Carrying Amount 0.9 0.1    
Diesel fuel swap contracts, Fair Value $ 0.9 $ 0.1