Share-Based Compensation (Compensation cost recognized in Income Statement) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	$ 43.8	$ 44.8	$ 48.6
Income Tax Benefit	(15.7)	(17.1)	(18.3)
After-Tax Share-Based Compensation	28.1	27.7	30.3
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	4.7	3.8	4.0
Selling and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	37.4	39.5	42.5
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	1.3	1.5	2.1
Cost Reduction Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Before-Tax Share-Based Compensation	$ 0.4	$ 0	$ 0