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Inventories (Tables)
9 Months Ended
Jun. 30, 2022
Inventory [Abstract]  
Inventories
June 30,
2022
September 30,
2021
Raw materials and supplies$68.4 $34.0 
Work in process0.1 0.1 
Finished products159.4 83.8 
   Inventories$227.9 $117.9