Shareowners' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (817.7)	$ (1,225.3)	$ (992.9)	$ (841.2)
Other comprehensive income (loss)	407.6	(232.4)	(151.7)
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 plans	12,200,000
Repurchase of common stock that did not settle, shares	60,000	110,000
Outstanding purchase of common stock recorded in accounts payable	6.4	7.6
Changes in outstanding common shares
Beginning Balance	139,800,000	141,900,000	141,700,000
Treasury stock purchases	(4,700,000)	(3,700,000)	(4,000,000)
Shares delivered under incentive plans	3,700,000	1,600,000	4,200,000
Ending Balance	138,800,000	139,800,000	141,900,000
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(823.8)	(1,226.0)	(1,033.6)	(854.9)
Other comprehensive income (loss)	402.2	(192.4)	(178.7)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	8.8	0.5	35.5	12.1
Other comprehensive income (loss)	8.3	(35.0)	23.4
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(2.7)	0.2	5.2	1.3
Other comprehensive income (loss)	(2.9)	(5.0)	3.9
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0	0	0	0.3
Other comprehensive income (loss)	$ 0	$ 0	$ (0.3)