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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 104.3 $ 87.6
Work in process 15.1 20.3
Raw materials, supplies and other 57.7 52.5
Inventories $ 177.1 $ 160.4