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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]
Bargain purchase gain from business acquisition	$ 0	$ 0	$ 158.3
Gain on contingent purchase price reduction	$ 0	$ 41.0	$ 0
Recognized income tax positions	50.00%

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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