Shareowners' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
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	9.0
Outstanding purchase of common stock recorded in accounts payable	$ 12.5	$ 4.5
Decrease to income tax benefits from share-based compensation related to correction of prior period amounts in the rollforward of additional paid-in capital		11.8
Increase to share-based compensation expense related to correction of prior period amounts in the rollforward of additional paid-in capital		$ 11.8
Changes in outstanding common shares
Beginning balance	136.7	138.8	139.8
Treasury stock purchases	(5.4)	(4.1)	(4.7)
Shares delivered under incentive plans	1.1	2.0	3.7
Ending balance	132.4	136.7	138.8