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Significant Accounting Policies - Inventories (Details) - USD ($)
$ in Millions
Aug. 31, 2020
Aug. 31, 2019
Inventory, Net [Abstract]    
Raw materials, supplies, and work in process $ 170.3 $ 179.4
Finished goods 199.1 183.7
Inventories excluding reserves 369.4 363.1
Less: Reserves (49.3) (22.3)
Total inventories $ 320.1 $ 340.8