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Inventories (Tables)
 3 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
December 31,
2016
 
September 30,
2016
 
December 31,
2015
Non-utility LPG and natural gas
 
$
150.9

 
$
129.8

 
$
148.6

Gas Utility natural gas
 
25.8

 
29.2

 
35.9

Materials, supplies and other
 
51.5

 
51.3

 
62.3

Total inventories
 
$
228.2

 
$
210.3

 
$
246.8