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Derivative Financial Instruments (Details 4) - USD ($)
$ in Millions
Apr. 30, 2015
Feb. 02, 2015
Apr. 30, 2014
Commodity contracts [Member]      
Outstanding derivative contracts      
Gross contract notional amount $ 640.6   $ 790.3
Foreign currency exchange contracts [Member]      
Outstanding derivative contracts      
Gross contract notional amount 136.4   158.1
Interest rate contract [Member]      
Outstanding derivative contracts      
Gross contract notional amount $ 0.0 $ 1,100.0 $ 750.0