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Inventories (Tables)
9 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories comprise the following: 
 
 
June 30,
2014
 
September 30,
2013
 
June 30,
2013
Non-utility LPG and natural gas
 
$
222.6

 
$
230.0

 
$
194.6

Gas Utility natural gas
 
45.7

 
78.9

 
43.1

Materials, supplies and other
 
63.7

 
56.6

 
66.3

Total inventories
 
$
332.0

 
$
365.5

 
$
304.0