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Inventories (Tables)
9 Months Ended
Jun. 30, 2020
Inventory [Abstract]  
Inventories
June 30,
2020
September 30,
2019
Raw materials and supplies$24.8  $26.4  
Work in process0.1  0.1  
Finished products159.7  111.7  
   Inventories$184.6  $138.2