Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments (Details Textual)

v2.4.0.8
Derivative Instruments (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2014
Aug. 31, 2013
Derivative [Line Items]        
Net unrealized loss on commodity swap contracts reported outside of segment operating results $ (4.3) $ 2.0 $ (9.8) $ (1.0)
Amount of net gains, net of income tax effect, to be reclassified from AOCI to earnings within the next 12 months     (1.8)  
Fair value of derivative instruments in a net liability position due to counterparties 27.1   27.1  
Fair value of derivative instruments in a net receivable position due from counterparties 9.9   9.9  
Commodity swap contracts [Member] | Unusual Items [Member]
       
Derivative [Line Items]        
Net unrealized loss on commodity swap contracts reported outside of segment operating results   $ 0   $ 0
Not designated as hedging instrument [Member] | Foreign currency contracts [Member]
       
Derivative [Line Items]        
Maturity period for derivative instruments     12 months  
Not designated as hedging instrument [Member] | Commodity swap contracts [Member]
       
Derivative [Line Items]        
Maturity period for derivative instruments     36 months  
Designated as hedging instrument [Member] | Cash flow hedging [Member]
       
Derivative [Line Items]        
Average maturity period for cash flow hedges     3 years  
Maximum maturity period for cash flow hedges     5 years