Income Taxes (Summary Of Valuation Allowance) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2010
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance beginning of year		$ 38.6		$ 40.5		$ 46.3
Net release of valuation allowance		0	[1]	(2.4)	[1]	(16.8)	[1]
Establish valuation allowance in the U.S. on foreign tax credits	124.5	124.5		0		4.8
Net increase in deferred tax assets for foreign jurisdictions with a full valuation allowance		0		0		2.8
Net decrease in deferred tax assets for foreign jurisdictions with a full valuation allowance		(2.1)		(0.8)		(0.3)
Establish valuation allowance in foreign jurisdictions		0.6		0		0
Adjust deferred tax asset and valuation allowance in the U.S. primarily for tax credits		8.8		1.3		3.7
Valuation allowance end of year	$ 170.4	$ 170.4		$ 38.6		$ 40.5

[1] In 2011 and 2010, this net reduction is primarily attributed to the release of the valuation allowance on foreign tax credits in the U.S. In both 2011 and 2010, this was the result of the subsidiary reorganizations described previously. As such, the current year change is included in subsidiary reorganization in the reconciliation between our statutory income tax rate and our effective income tax rate.