Retirement Benefits (Changes In Plan Assets And Benefit Obligation Recognized In Accumulated Other Comprehensive Income (Loss) On Pretax Basis) (Details) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
U.S. [Member]
Net actuarial loss (gain) arising during the period	$ 236.5	$ 191.6
Amortization of net actuarial loss	(63.9)	(57.6)
Prior service cost arising during the period	0.6	1.3
Amortization of prior service credit (cost)	(2.6)	(2.7)
Total recognized in Other Comprehensive Income	170.6	132.6
International [Member]
Net actuarial loss (gain) arising during the period	(108.8)	103.2
Amortization of net actuarial loss	(31.9)	(20.7)
Prior service cost arising during the period		1.0
Amortization of prior service credit (cost)	(0.6)	(0.7)
Total recognized in Other Comprehensive Income	(141.3)	82.8
Other Postretirement Benefits [Member]
Net actuarial loss (gain) arising during the period	(2.5)	7.8
Amortization of net actuarial loss	(3.8)	(2.9)
Amortization of prior service credit (cost)		0.1
Total recognized in Other Comprehensive Income	$ (6.3)	$ 5.0