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Inventories (Tables)
9 Months Ended
Jun. 30, 2011
Inventories [Abstract]  
Inventories
                         
    June 30,     September 30,     June 30,  
    2011     2010     2010  
Non-utility LPG and natural gas
  $ 170.5     $ 157.9     $ 145.6  
Gas Utility natural gas
    50.1       111.5       60.3  
Materials, supplies and other
    51.0       44.6       43.3  
 
                 
Total inventories
  $ 271.6     $ 314.0     $ 249.2