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Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of beginning and ending amount of unrecognized tax benefit
Beginning Balance	$ 2.9	$ 6.3	$ 5.4
Additions for tax positions of the current year	0.7	0.5	0.4
Additions for tax positions of prior years		0.6
Reductions as a result of tax positions taken in prior years			1.0
Settlements with tax authorities	(0.2)	(4.5)	(0.5)
Ending Balance	$ 3.4	$ 2.9	$ 6.3

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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