Shareowner's Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
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	$ 0
Common Stock reserved for various incentive plan	19,100,000
Repurchase of Common Stock that did not settle, shares	110,000	30,000
Outstanding purchase of Common Stock recorded in accounts payable	$ 7.6	$ 1.7
Accumulated other comprehensive loss
Unrecognized pension and postretirement benefit plan liabilities (Note 12)	(1,226.0)	(1,033.6)
Accumulated currency translation adjustments	0.5	35.5
Net unrealized gains on cash flow hedges	0.2	5.2
Accumulated other comprehensive loss	$ (1,225.3)	$ (992.9)
Changes in outstanding common shares
Beginning Balance	141,900,000	141,700,000	142,100,000
Treasury stock purchases	(3,700,000)	(4,000,000)	(2,200,000)
Shares delivered under incentive plans	1,600,000	4,200,000	1,800,000
Ending Balance	139,800,000	141,900,000	141,700,000