Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Sales and operating results of reportable segments
Sales	$ 1,560.4	$ 1,516.2	$ 4,595.4	$ 4,346.1
Income from continuing operations	190.7	178.8	541.8	495.3
Business Segment information (Textual) [Abstract]
Portion of total sales to largest distributor	10.00%	10.00%	10.00%	10.00%
Total Segments [Member]
Sales and operating results of reportable segments
Income from continuing operations	284.0	263.3	836.1	729.5
Architecture and Software [Member]
Sales and operating results of reportable segments
Sales	663.8	672.9	1,979.1	1,911.0
Income from continuing operations	182.3	175.9	536.3	481.2
Control Products and Solutions [Member]
Sales and operating results of reportable segments
Sales	896.6	843.3	2,616.3	2,435.1
Income from continuing operations	101.7	87.4	299.8	248.3
Purchase accounting depreciation and amortization [Member]
Sales and operating results of reportable segments
Income from continuing operations	(5.0)	(5.1)	(14.9)	(14.6)
General corporate - net [Member]
Sales and operating results of reportable segments
Income from continuing operations	(19.0)	(22.3)	(65.0)	(58.5)
Interest expense [Member]
Sales and operating results of reportable segments
Income from continuing operations	(15.2)	(14.7)	(45.2)	(44.9)
Income tax provision [Member]
Sales and operating results of reportable segments
Income from continuing operations	$ (54.1)	$ (42.4)	$ (169.2)	$ (116.2)