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
Aug. 31, 2012
Feb. 29, 2012
Aug. 31, 2011
Feb. 28, 2011
Assets:        
Cash and cash investments, Carrying Amount $ 178.5 $ 85.8 $ 10.0 $ 9.2
Cash and cash investments, Fair Value 178.5 85.8    
Accounts receivable, Carrying Amount 487.1 436.0    
Accounts receivable, Fair Value 487.1 436.0    
Restricted cash, Carrying Amount 650.0 0    
Restricted cash, Fair Value 650.0 0    
Available-for-sale debt securities, Carrying Amount 30.9 28.5    
Available-for-sale debt securities, Fair Value 30.9 28.5    
Foreign currency contracts, Carrying Amount 3.2 13.2    
Foreign currency contracts, Fair Value 3.2 13.2    
Interest rate swap contracts, Carrying Amount 8.1 0    
Interest rate swap contracts, Fair Value 8.1 0    
Diesel fuel swap contracts, Carrying Value 1.5 0    
Diesel fuel swap contracts, Fair Value 1.5 0    
Notes receivable, Carrying Amount 0 1.6    
Notes receivable, Fair Value 0 1.6    
Liabilities:        
Notes payable to banks 15.2 377.9    
Notes payable to banks, Fair Value 15.2 377.6    
Accounts payable, Carrying Amount 185.6 130.5    
Accounts payable, Fair Value 185.6 130.5    
Long-term debt, including current portion, Carrying Amount 3,972.5 2,751.6    
Long-term debt, including current portion, Fair Value 4,318.5 3,007.9    
Foreign currency contracts, Carrying Amount 3.1 6.4    
Foreign currency contracts, Fair Value 3.1 6.4    
Interest rate swap contracts, Carrying Amount 57.5 45.7    
Interest rate swap contracts, Fair Value $ 57.5 $ 45.7