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Inventories (Tables)
6 Months Ended
Mar. 31, 2023
Inventory [Abstract]  
Inventories
March 31,
2023
September 30,
2022
Raw materials and supplies$91.2 $58.3 
Work in process0.1 0.1 
Finished products174.2 141.4 
   Inventories$265.5 $199.8