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Receivables From Customers, Net and Notes Receivable, Net - Allowance for Customer Receivables (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2013 Commodity and Risk Management [Member]	Dec. 31, 2012 Commodity and Risk Management [Member]
Receivables from customers and notes receivable, net [Abstract]
Allowance for Doubtful Accounts Receivable	$ 1.4	$ 1.1
Statement [Line Items]
Provision for Doubtful Accounts	0.3		0.4	0.4
Allowance for Doubtful Accounts Receivable, Charge-offs			$ 0.1

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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