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Inventories (Tables)
3 Months Ended
Dec. 31, 2021
Inventory [Abstract]  
Inventories
December 31,
2021
September 30,
2021
Raw materials and supplies$37.7 $34.0 
Work in process0.1 0.1 
Finished products92.4 83.8 
   Inventories$130.2 $117.9