Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Sales and operating results of reportable segments
Sales	$ 1,591.7	$ 1,489.2
Income before income taxes	272.8	217.2
Interest expense	(14.9)	(15.4)
Operating Segments [Member]
Sales and operating results of reportable segments
Income before income taxes	328.0	276.0
Architecture & Software [Member]
Sales and operating results of reportable segments
Sales	695.9	657.5
Income before income taxes	211.9	183.2
Control Products & Solutions [Member]
Sales and operating results of reportable segments
Sales	895.8	831.7
Income before income taxes	116.1	92.8
Segment Reconciling Items [Member]
Sales and operating results of reportable segments
Purchase accounting depreciation and amortization	(4.6)	(5.2)
Non-operating pension costs	(14.0)	(19.7)
Corporate, Non-Segment [Member]
Sales and operating results of reportable segments
General corporate - net	(21.7)	(18.5)
Interest expense	$ (14.9)	$ (15.4)