Retirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11.2	$ 10.9	$ 22.5	$ 21.8
Interest cost	31.0	30.7	62.1	61.5
Expected return on plan assets	(44.5)	(44.9)	(89.0)	(89.8)
Prior service cost amortization	0.6	0.6	1.3	1.2
Actuarial loss amortization	19.7	16.0	39.3	32.0
Special termination benefits	4.6		4.6
Other
Net periodic benefit cost	22.6	13.3	40.8	26.7
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6.1	7.3	12.1	14.5
Interest cost	15.5	16.0	31.2	31.7
Expected return on plan assets	(16.5)	(17.0)	(33.3)	(33.6)
Prior service cost amortization	0.1	0.2	0.2	0.4
Actuarial loss amortization	3.8	8.2	7.7	15.6
Special termination benefits	2.2		2.2
Other	0.7	0.5	1.3	0.9
Net periodic benefit cost	11.9	15.2	21.4	29.5
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.1	1.4	2.2	2.8
Interest cost	1.0	0.8	2.0	1.6
Expected return on plan assets
Prior service cost amortization
Actuarial loss amortization	0.7	1.0	1.4	2.0
Special termination benefits
Other
Net periodic benefit cost	$ 2.8	$ 3.2	$ 5.6	$ 6.4