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Property, net (Notes)
6 Months Ended
Mar. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, net PROPERTY, NET
March 31,
2020
September 30, 2019
Property, at cost  $21.1  $21.1  
Accumulated depreciation  (10.8) (9.4) 
   Property, net$10.3  $11.7