Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Components of income before income taxes
United States									$ 469.6	$ 364.3	$ 144.9
Non-United States									496.3	503.3	399.3
Total	254.9	244.8	223.3	242.9	256.1	221.2	203.6	186.7	965.9	867.6	544.2
Current income tax provision:
United States									71.3	51.0	9.7
Non-United States									72.3	75.0	36.7
State and local									3.1	(2.0)	(0.1)
Total current									146.7	124.0	46.3
Deferred income tax provision:
United States									76.8	46.6	41.2
Non-United States									0.4	(5.2)	13.1
State and local									5.0	5.1	3.2
Total deferred									82.2	46.5	57.5
Income tax provision									228.9	170.5	103.8
Total income taxes paid									$ 167.5	$ 118.6	$ 100.7