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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Inventory Disclosure [Abstract]    
Finished products $ 7.0 $ 6.8
Semi-finished products 11.0 11.0
Raw materials and supplies 9.5 8.7
Inventories $ 27.5 $ 26.5