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Energy Services Accounts Receivable Securitization Facility (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Energy services accounts receivable securitization facility (Additional Textual) [Abstract]    
Receivables facility $ 200  
Energy Services Funding Corporation [Member]
    
Energy services accounts receivable securitization facility (Textual) [Abstract]    
Sale of undivided interests in its trade receivables to the commercial paper conduit 79.5 94.0
Outstanding balance of trade receivables 69.3 78.4
Outstanding balance of trade receivables sold 33.0 33.2
Energy Services [Member]
    
Energy services accounts receivable securitization facility (Textual) [Abstract]    
Sale of trade receivables $ 224.3 $ 251.2