Retirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
U.S. [Member]
Service cost	$ 43.6	$ 42.5	$ 33.9
Interest cost	122.8	123.4	124.0
Expected return on plan assets	(179.4)	(164.3)	(146.5)
Prior service cost (credit) amortization	2.6	2.7	2.6
Actuarial loss amortization	63.9	46.9	6.2
Settlements and curtailments		10.7	9.7
Special termination benefits		(0.9)	7.2
Other
Net Periodic Benefit Cost	53.5	61.0	37.1
International [Member]
Service cost	29.5	24.2	26.6
Interest cost	64.2	60.2	60.9
Expected return on plan assets	(68.1)	(64.3)	(55.3)
Prior service cost (credit) amortization	0.6	0.7	1.3
Actuarial loss amortization	30.9	19.9	10.8
Settlements and curtailments	1.0	0.8	4.8
Special termination benefits	0.3	4.2	22.1
Other	2.2	2.3	1.7
Net Periodic Benefit Cost	60.6	48.0	72.9
Other Postretirement Benefits [Member]
Service cost	5.7	4.7	4.0
Interest cost	3.3	4.6	6.5
Prior service cost (credit) amortization		(0.1)	(1.4)
Actuarial loss amortization	3.8	2.9	0.1
Net Periodic Benefit Cost	$ 12.8	$ 12.1	$ 9.2