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Energy Services Accounts Receivable Securitization Facility (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivables facility $ 100    
Outstanding balance of trade receivables 55.0 43.5  
Outstanding balance of trade receivables sold 30.0 0  
Period One [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivables Facility, Maximum Borrowing Capacity 150    
Period Two [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Receivables Facility, Maximum Borrowing Capacity 75    
Energy Services [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sale of trade receivables 975.3 836.0 1,134.9
Energy Services Funding Corporation [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sale of undivided interests in its trade receivables to the commercial paper conduit 291.0 286.0 88.0
Losses on sales of receivables to commercial paper conduit included in interest expenses 0.7    
Losses on sale of receivables to the commercial paper   $ 1.0 $ 1.2