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Inventories (Tables)
12 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories comprise the following at September 30:
 
2017
 
2016
Non-utility LPG and natural gas
$
188.4

 
$
129.8

Gas Utility natural gas
39.5

 
29.2

Materials, supplies and other
50.7

 
51.3

Total inventories
$
278.6

 
$
210.3