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Inventories (Tables)
 3 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
December 31,
2019
 
September 30,
2019
 
December 31,
2018
Non-utility LPG and natural gas
 
$
163.7

 
$
150.2

 
$
206.7

Gas Utility natural gas
 
24.3

 
26.6

 
34.9

Materials, supplies and other
 
59.5

 
53.1

 
52.1

Total inventories
 
$
247.5

 
$
229.9

 
$
293.7