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Inventories (Tables)
6 Months Ended
Mar. 31, 2021
Inventory [Abstract]  
Inventories
March 31,
2021
September 30,
2020
Raw materials and supplies$22.8 $33.7 
Work in process0.1 0.1 
Finished products125.3 116.7 
   Inventories$148.2 $150.5