Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Sales and operating results of reportable segments
Sales	$ 1,516.2	$ 1,268.1	$ 4,346.1	$ 3,500.1
Income from continuing operations	178.8	119.4	495.3	309.1
Business Segment information (Textuals) [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	263.3	198.0	729.5	512.1
Architecture and Software [Member]
Sales and operating results of reportable segments
Sales	672.9	553.9	1,911.0	1,539.1
Income from continuing operations	175.9	125.4	481.2	347.0
Control Products and Solutions [Member]
Sales and operating results of reportable segments
Sales	843.3	714.2	2,435.1	1,961.0
Income from continuing operations	87.4	72.6	248.3	165.1
Purchase accounting depreciation and amortization [Member]
Sales and operating results of reportable segments
Income from continuing operations	(5.1)	(4.6)	(14.6)	(14.2)
General corporate - net [Member]
Sales and operating results of reportable segments
Income from continuing operations	(22.3)	(23.1)	(58.5)	(66.2)
Interest expense [Member]
Sales and operating results of reportable segments
Income from continuing operations	(14.7)	(14.8)	(44.9)	(45.3)
Income tax provision [Member]
Sales and operating results of reportable segments
Income from continuing operations	$ (42.4)	$ (36.1)	$ (116.2)	$ (77.3)