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Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Millions
Aug. 31, 2019
Aug. 31, 2018
Inventory, Net [Abstract]    
Raw materials, supplies, and work in process $ 179.4 $ 196.8
Finished goods 183.7 251.8
Inventories excluding reserves 363.1 448.6
Less: Reserves (22.3) (36.8)
Total inventories $ 340.8 $ 411.8