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Commitments and Contingencies Impairment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Commitments and Contingencies [Abstract]
Asset Impairment Charges	$ 0	$ 0	$ 1.1
Equity Method Investment, Ownership Percentage			55.00%
Equity Method Investment, Realized Gain (Loss) on Disposal	$ 0.1

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.