Shareowners' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Shareowners' Equity (Textuals) [Abstract]
Common stock, authorized	1,000.0
Common stock, par value	$ 1.00	$ 1.00
Preferred stock, authorized	25.0
Preferred stock, par value	$ 0
Common stock reserved for various incentive plans	13.1
Outstanding purchase of common stock recorded in accounts payable	$ 5.3	$ 12.5
Changes in outstanding common shares
Beginning balance	132.4	136.7	138.8
Treasury stock purchases	(4.6)	(5.4)	(4.1)
Shares delivered under incentive plans	0.7	1.1	2.0
Ending balance	128.5	132.4	136.7