Quarterly Financial Information (Unaudited) (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
Quarterly Financial Information (Unaudited)
Sales	$ 1,715.7	$ 1,624.2	$ 1,522.8	$ 1,489.2	$ 1,664.0	$ 1,560.4	$ 1,561.1	$ 1,473.9	$ 6,351.9	$ 6,259.4	$ 6,000.4
Gross profit	697.2	652.9	616.4	607.3	654.2	631.5	618.3	618.7	2,573.8	2,522.7	2,390.4
Income from continuing operations before income taxes	279.2	257.4	227.1	217.2	254.9	244.8	223.3	242.9	980.9	965.9	867.6
Net income	$ 215.3	$ 203.7	$ 175.9	$ 161.4	$ 195.2	$ 190.7	$ 167.8	$ 183.3	$ 756.3	$ 737.0	$ 697.8
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
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