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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012
Income Taxes [Abstract]
Unrecognized tax benefits relating to UTPs	$ 76.3
Unrecognized tax benefits, interest on income taxes accrued	2.9
Unrecognized tax benefits, income tax penalties accrued	9.5
Statute of limitations to expire during next twelve months	2007, 2008 and 2009
Potential change in unrecognized tax benefits is reasonably possible during next twelve months, amount of unrecorded benefit tax positions	1.0
Unrecognized tax benefits that would reduce the income tax provision		$ 38.2

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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