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Inventories (Details) - USD ($)
$ in Millions
May 31, 2019
Aug. 31, 2018
Inventory, Net [Abstract]    
Raw materials, supplies, and work in process $ 178.9 $ 196.8
Finished goods 240.3 251.8
Inventories excluding reserves 419.2 448.6
Less: Reserves (28.6) (36.8)
Total inventories $ 390.6 $ 411.8