Capital Stock (Narratives) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Sep. 15, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 20, 2007
Capital Stock [Abstract]
Preferred Stock Shares Authorized		25,000,000
Preferred Stock, Par or Stated Value Per Share		$ 1
Preferred Stock, Shares Outstanding		0
Common stock, authorized shares		300,000,000
Common stock, par value		$ 1	$ 1
Equity, Class of Treasury Stock [Line Items]
Share repurchase program authorized amount					$ 1,000
Purchase of treasury shares		(594,916)	(7,433,612)	0
Cost of shares repurchased		53.1	649.2
Share repurchase authorization remaining, amount	$ 1,000.0	$ 946.9