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Inventories (Tables)
3 Months Ended
Dec. 31, 2019
Inventory [Abstract]  
Inventories
 
December 31,
2019
 
September 30, 2019
Raw materials and supplies
$
27.0

 
$
26.4

Work in process
0.1

 
0.1

Finished products
123.1

 
111.7

   Inventories
$
150.2

 
$
138.2