Basis of Presentation and Accounting Policies (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	Jun. 30, 2011
Reconciled Basic and Diluted EPS
Income from continuing operations	$ 190.7	$ 178.8	$ 541.8	$ 495.3
Less: Allocation to participating securities	(0.3)	(0.3)	(1.0)	(1.0)
Income from continuing operations available to common shareowners	190.4	178.5	540.8	494.3
Income from discontinued operations	0	0.7	0	0.7
Less: Allocation to participating securities	0	0	0	0
Income from discontinued operations available to common shareowners	0	0.7	0	0.7
Net income	190.7	179.5	541.8	496.0
Less: Allocation to participating securities	(0.3)	(0.3)	(1.0)	(1.0)
Net income available to common shareowners	$ 190.4	$ 179.2	$ 540.8	$ 495.0
Basic weighted average outstanding shares	141.7	143.4	142.0	142.8
Effect of dilutive securities
Stock options	1.6	2.1	1.7	2.3
Performance shares	0.2	0.4	0.3	0.4
Diluted weighted average outstanding shares	143.5	145.9	144.0	145.5
Earnings Per Share, Basic [Abstract]
Continuing operations	$ 1.34	$ 1.24	$ 3.81	$ 3.46
Discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.01
Net income	$ 1.34	$ 1.25	$ 3.81	$ 3.47
Earnings Per Share, Diluted [Abstract]
Continuing operations	$ 1.33	$ 1.22	$ 3.76	$ 3.40
Discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.00
Net income	$ 1.33	$ 1.23	$ 3.76	$ 3.40