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Inventories (Tables)
 3 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
December 31,
2018
 
September 30,
2018
 
December 31,
2017
Non-utility LPG and natural gas
 
$
206.7

 
$
231.7

 
$
216.4

Gas Utility natural gas
 
34.9

 
37.3

 
34.6

Materials, supplies and other
 
52.1

 
49.2

 
56.3

Total inventories
 
$
293.7

 
$
318.2

 
$
307.3