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Other Income Net (Tables)
12 Months Ended
Sep. 30, 2011
Other Income, Net [Abstract] 
Other Income, Net
                         
    2011     2010     2009  
Interest and interest-related income
  $ 2.3     $ 2.9     $ 5.0  
Antargaz Competition Authority Matter
    9.4       —       (10.0 )
Utility non-tariff service income
    6.4       2.4       3.2  
Foreign currency hedge loss
    (6.1 )     —       —  
Gain on sale of Partnership LPG storage facility
    —       —       39.9  
Gain on sale of Atlantic Energy, LLC
    —       36.5       —  
Finance charges
    15.1       11.3       11.7  
Partnership interest rate protection agreement losses
    —       (12.2 )     (1.7 )
Other, net
    19.4       17.1       7.8  
 
                 
Total other income, net
  $ 46.5     $ 58.0     $ 55.9