Income Taxes (Details) (USD $) In Millions, 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
Components of income before income taxes
United States									$ 513.5	$ 469.6	$ 364.3
Non-United States									467.4	496.3	503.3
Total	279.2	257.4	227.1	217.2	254.9	244.8	223.3	242.9	980.9	965.9	867.6
Current income tax provision:
United States									164.5	71.3	51.0
Non-United States									51.1	72.3	75.0
State and local									15.5	3.1	(2.0)
Total current									231.1	146.7	124.0
Deferred income tax provision:
United States									(1.3)	76.8	46.6
Non-United States									(2.9)	0.4	(5.2)
State and local									(2.3)	5.0	5.1
Total deferred									(6.5)	82.2	46.5
Income tax provision									224.6	228.9	170.5
Total income taxes paid									$ 203.9	$ 167.5	$ 118.6