Shareowner's Equity (Details) (USD $) In Millions, except Share data	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Changes in outstanding common shares
Beginning Balance	141,700,000	142,100,000	143,200,000
Treasury stock purchases	(4,000,000)	(2,200,000)	(1,700,000)
Shares delivered under incentive plans	4,200,000	1,800,000	600,000
Ending Balance	141,900,000	141,700,000	142,100,000
Accumulated other comprehensive loss
Unrecognized pension and postretirement benefit plan liabilities (Note 12)	$ (1,033.6)	$ (854.9)
Accumulated currency translation adjustments	35.5	12.1
Net unrealized gains on cash flow hedges	5.2	1.3
Unrealized gains on investment securities	0	0.3
Accumulated other comprehensive loss	(992.9)	(841.2)
Shareowners' Equity (Textuals) [Abstract]
Common Stock, authorized	1,000,000,000
Common Stock, par value	$ 1.00
Preferred Stock, authorized	25,000,000
Preferred Stock, par value
Treasury Stock, Retired			35,000,000
Common Stock reserved for various incentive plan	13,900,000
Repurchase of Common Stock that did not settle, shares	30,000	19,700
Outstanding purchase of Common Stock recorded in accounts payable	$ 1.7	$ 1.2