Cost Reduction Plan (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012 Employees		Jun. 30, 2011
Cost Reduction Plan [Abstract]
Cost reduction plan charge	$ 0	[1]	$ 0	[1]	$ 86.8	[1]	$ 0	[1]
Cost reduction plan charge, after-tax					60.6
Cost reduction plan charge, per share					$ 0.28
Severance and other costs					80.8
Number of positions to be eliminated					600
Write-down of certain assets					$ 6.0

[1] Information about how this charge related to the businesses at the segment level is discussed in Note 4, Cost Reduction Plan.