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, 2013
Jun. 07, 2013
Feb. 28, 2013
Aug. 31, 2012
Feb. 29, 2012
Assets:          
Cash and cash investments, Carrying Amount $ 116.8 $ 232.0 $ 331.5 $ 178.5 $ 85.8
Cash and cash investments, Fair Value 116.8   331.5    
Accounts receivable, net, Carrying Amount 655.9   471.9    
Accounts receivable, net, Fair Value 655.9   471.9    
Available-for-sale debt securities, Carrying Amount 33.9   34.2    
Available-for-sale debt securities, Fair Value 33.9   34.2    
Foreign currency contracts, Carrying Amount 10.9   9.7    
Foreign currency contracts, Fair Value 10.9   9.7    
Interest rate swap contracts, Carrying Amount 6.9   6.6    
Interest rate swap contracts, Fair Value 6.9   6.6    
Diesel fuel swap contracts, Carrying Value 1.6   0.6    
Diesel fuel swap contracts, Fair Value 1.6   0.6    
Liabilities:          
Notes payable to banks 272.1   0    
Notes payable to banks, Fair Value 266.3   0    
Accounts payable, Carrying Amount 341.2   209.0    
Accounts payable, Fair Value 341.2   209.0    
Long-term debt, including current portion, Carrying Amount 7,028.4   3,305.4    
Long-term debt, including current portion, Fair Value 6,962.9   3,603.6    
Foreign currency contracts, Carrying Amount 9.9   5.3    
Foreign currency contracts, Fair Value 9.9   5.3    
Interest rate swap contracts, Carrying Amount 39.2   47.1    
Interest rate swap contracts, Fair Value 39.2   47.1    
Diesel fuel swap contracts, Carrying Amount 0.1   0.1    
Diesel fuel swap contracts, Fair Value $ 0.1   $ 0.1