Basis of Presentation and Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reconciled Basic and Diluted EPS
Income from continuing operations									$ 756.3	$ 737.0	$ 697.1
Less: Allocation to participating securities									(1.1)	(1.4)	(1.4)
Income from continuing operations available to common shareowners									755.2	735.6	695.7
Income from discontinued operations (Note 13)									0	0	0.7
Less: Allocation to participating securities									0	0	0
Income from discontinued operations available to common shareowners									0	0	0.7
Net income	215.3	203.7	175.9	161.4	195.2	190.7	167.8	183.3	756.3	737.0	697.8
Less: Allocation to participating securities									(1.1)	(1.4)	(1.4)
Net income available to common shareowners									$ 755.2	$ 735.6	$ 696.4
Basic weighted average outstanding shares									139.2	141.5	142.7
Effect of dilutive securities
Stock options									1.5	1.6	2.1
Performance shares									0.2	0.3	0.4
Diluted weighted average outstanding shares									140.9	143.4	145.2
Basic earnings per share:
Continuing operations	$ 1.55	$ 1.46	$ 1.25	$ 1.16	$ 1.39	$ 1.34	$ 1.18	$ 1.29	$ 5.43	$ 5.20	$ 4.88
Discontinued operations									$ 0.00	$ 0.00	$ 0.00
Net income									$ 5.43	$ 5.20	$ 4.88
Diluted earnings per share:
Continuing operations	$ 1.53	$ 1.45	$ 1.24	$ 1.14	$ 1.38	$ 1.33	$ 1.16	$ 1.27	$ 5.36	$ 5.13	$ 4.79
Discontinued operations									$ 0.00	$ 0.00	$ 0.01
Net income									$ 5.36	$ 5.13	$ 4.80