Quarterly Financial Information (Unaudited) (Details) (USD $) In Millions, except Per Share data	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Quarterly Financial Information (Unaudited)
Sales	$ 1,654.3	$ 1,516.2	$ 1,464.1	$ 1,365.8	$ 1,268.1	$ 1,164.5	$ 1,067.5	$ 1,356.9	$ 6,000.4	$ 4,857.0	$ 4,332.5
Gross profit	663.2	606.8	576.5	543.9	507.3	473.1	426.8	529.2	2,390.4	1,936.4	1,569.5
Income from continuing operations before income taxes	256.1	221.2	203.6	186.7	155.5	133.6	97.3	157.8	867.6	544.2	273.9
Income from continuing operations	201.8	178.8	166.4	150.1	119.4	111.9	77.8	131.3	697.1	440.4	217.9
Income from discontinued operations (Note 13)		0.7				25.1	(1.2)		0.7	23.9	2.8
Net income	$ 201.8	$ 179.5	$ 166.4	$ 150.1	$ 119.4	$ 137.0	$ 76.6	$ 131.3	$ 697.8	$ 464.3	$ 220.7
Basic earnings per share:
Continuing operations	$ 1.41	$ 1.24	$ 1.16	$ 1.06	$ 0.84	$ 0.78	$ 0.55	$ 0.93	$ 4.88	$ 3.09	$ 1.54
Discontinued operations		$ 0.01				$ 0.18	$ (0.01)			$ 0.17	$ 0.02
Net income	$ 1.41	$ 1.25	$ 1.16	$ 1.06	$ 0.84	$ 0.96	$ 0.54	$ 0.93	$ 4.88	$ 3.26	$ 1.56
Diluted earnings per share:
Continuing operations	$ 1.39	$ 1.22	$ 1.14	$ 1.04	$ 0.83	$ 0.77	$ 0.54	$ 0.91	$ 4.79	$ 3.05	$ 1.53
Discontinued operations		$ 0.01				$ 0.18	$ (0.01)		$ 0.01	$ 0.17	$ 0.02
Net income	$ 1.39	$ 1.23	$ 1.14	$ 1.04	$ 0.83	$ 0.95	$ 0.53	$ 0.91	$ 4.80	$ 3.22	$ 1.55