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Inventories (Tables)
3 Months Ended
Dec. 31, 2020
Inventory [Abstract]  
Inventories
December 31,
2020
September 30,
2020
Raw materials and supplies$26.2 $33.7 
Work in process0.1 0.1 
Finished products110.1 116.7 
   Inventories$136.4 $150.5