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Inventories (Tables)
9 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
June 30,
2018
 
September 30,
2017
 
June 30,
2017
Non-utility LPG and natural gas
 
$
177.0

 
$
188.4

 
$
135.4

Gas Utility natural gas
 
18.6

 
39.5

 
21.8

Materials, supplies and other
 
57.6

 
50.7

 
58.9

Total inventories
 
$
253.2

 
$
278.6

 
$
216.1