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Inventories (Tables)
6 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
March 31,
2019
 
September 30,
2018
 
March 31,
2018
Non-utility LPG and natural gas
 
$
159.7

 
$
231.7

 
$
163.0

Gas Utility natural gas
 
3.4

 
37.3

 
3.5

Materials, supplies and other
 
58.9

 
49.2

 
61.8

Total inventories
 
$
222.0

 
$
318.2

 
$
228.3