Retirement Benefits (Schedule of Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
U.S. [Member]
Service cost	$ 10.9	$ 10.6	$ 32.7	$ 31.8
Interest cost	30.7	30.9	92.2	92.7
Expected return on plan assets	(44.9)	(41.1)	(134.7)	(123.3)
Prior service cost amortization	0.6	0.7	1.8	2.1
Actuarial loss amortization	16.0	11.7	48.0	35.1
Settlement and curtailment charges		5.8		5.8
Special termination benefits		(0.7)		(0.7)
Other
Net periodic benefit cost	13.3	17.9	40.0	43.5
International [Member]
Service cost	7.5	5.7	22.0	17.9
Interest cost	16.3	14.3	48.0	45.3
Expected return on plan assets	(17.3)	(15.3)	(50.9)	(48.2)
Prior service cost amortization	0.2	0.1	0.6	0.5
Actuarial loss amortization	7.7	4.7	23.3	14.7
Settlement and curtailment charges		0.5		0.5
Special termination benefits	0.3		0.3	3.5
Other	0.8	0.2	1.7	2.1
Net periodic benefit cost	15.5	10.2	45.0	36.3
Other Postretirement Benefits [Member]
Service cost	1.4	1.2	4.2	3.6
Interest cost	0.8	1.1	2.4	3.3
Expected return on plan assets
Prior service cost amortization
Actuarial loss amortization	1.0	0.7	3.0	2.1
Settlement and curtailment charges
Special termination benefits
Other
Net periodic benefit cost	$ 3.2	$ 3.0	$ 9.6	$ 9.0