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Receivables from customers and notes receivable, net Level 4 - Bad Debt Expense and Recoveries (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Receivables from customers and notes receivable, net [Abstract]
Provision for Doubtful Accounts	$ 0.7	$ 1.2	$ 0.7	$ 4.0
Allowance for Doubtful Accounts Receivable, Period Increase (Decrease)		3.0	0.5	7.5
Allowance for Doubtful Accounts Receivable, Recoveries	1.8	1.8	0	3.7
Allowance for Doubtful Accounts Receivable, Specific Customer Recoveries				$ 1.3

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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