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Inventories (Tables)
6 Months Ended
Mar. 31, 2020
Inventory [Abstract]  
Inventories
March 31,
2020
September 30, 2019
Raw materials and supplies  $19.7  $26.4  
Work in process  0.1  0.1  
Finished products  131.4  111.7  
   Inventories  $151.2  $138.2