Cost Reduction Plan (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Cost Reduction Plan [Abstract]
Cost reduction plan	$ 86.8		$ 86.8
Cost reduction plan charge incurred, after-tax amount	60.6
Cost reduction plan charge incurred, per share amount	$ 0.28
Severance and other costs	80.8		80.8
Number of positions to be eliminated	600
Write-down of certain assets held for sale	$ 6.0		$ 6.0