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Income Tax Expense (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Income Tax Expense [Abstract]
Balance as of October 1	$ 3.2	$ 3.3
Increases related to prior year tax positions	0.7	0.2
Decreases related to prior year tax positions		(0.2)
Increases related to current year tax positions	0.2	0.1
Lapse of statute of limitations	(0.5)	(0.2)
Balance as of September 30	$ 3.6	$ 3.2

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- Definition

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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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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