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Inventories - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
May 31, 2016
Feb. 29, 2016
Aug. 31, 2015
Inventory [Line Items]      
Percentage of LIFO inventory 17.00%   18.00%
LIFO inventory, difference amount had FIFO inventory valuation method been used $ 69.2   $ 68.1
Energy [Member]      
Inventory [Line Items]      
Inventory Write-down   $ 80.2  
Inventory Recovery $ 80.2