Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Components of income before income taxes
United States									$ 607.3	$ 513.5	$ 469.6
Non-United States									526.9	467.4	496.3
Total	339.0	274.0	248.4	272.8	279.2	257.4	227.1	217.2	1,134.2	980.9	965.9
Current income tax provision:
United States									219.4	164.5	71.3
Non-United States									85.3	51.1	72.3
State and local									9.9	15.5	3.1
Total current									314.6	231.1	146.7
Deferred income tax provision:
United States									(3.8)	(1.3)	76.8
Non-United States									(4.0)	(2.9)	0.4
State and local									0.6	(2.3)	5.0
Total deferred									(7.2)	(6.5)	82.2
Income tax provision									307.4	224.6	228.9
Total income taxes paid									$ 323.8	$ 203.9	$ 167.5