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Inventories (Tables)
 9 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
June 30,
2017
 
September 30,
2016
 
June 30,
2016
Non-utility LPG and natural gas
 
$
135.4

 
$
129.8

 
$
107.9

Gas Utility natural gas
 
21.8

 
29.2

 
13.5

Materials, supplies and other
 
58.9

 
51.3

 
62.8

Total inventories
 
$
216.1

 
$
210.3

 
$
184.2