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Inventories (Tables)
9 Months Ended
Jun. 30, 2021
Inventory [Abstract]  
Inventories
June 30,
2021
September 30,
2020
Raw materials and supplies$24.8 $33.7 
Work in process0.2 0.1 
Finished products116.7 116.7 
   Inventories$141.7 $150.5