Business Segment Information (Details) (USD $) In Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Sep. 30, 2009	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Sales and operating results of reportable segments
Sales	$ 1,654.3	$ 1,516.2	$ 1,464.1	$ 1,365.8	$ 1,268.1	$ 1,164.5	$ 1,067.5	$ 1,356.9	$ 6,000.4	$ 4,857.0	$ 4,332.5
Income from continuing operations before income taxes	256.1	221.2	203.6	186.7	155.5	133.6	97.3	157.8	867.6	544.2	273.9
Total Segments [Member]
Sales and operating results of reportable segments
Income from continuing operations before income taxes									1,027.6	717.2	429.7
Architecture and Software [Member]
Sales and operating results of reportable segments
Sales									2,594.3	2,115.0	1,723.5
Income from continuing operations before income taxes									659.1	475.4	223.0
Control Products and Solutions [Member]
Sales and operating results of reportable segments
Sales									3,406.1	2,742.0	2,609.0
Income from continuing operations before income taxes									368.5	241.8	206.7
Purchase accounting depreciation and amortization [Member]
Sales and operating results of reportable segments
Income from continuing operations before income taxes									(19.8)	(18.9)	(18.6)
General corporate - net [Member]
Sales and operating results of reportable segments
Income from continuing operations before income taxes									(80.7)	(93.6)	(80.3)
Interest expense [Member]
Sales and operating results of reportable segments
Income from continuing operations before income taxes									(59.5)	(60.5)	(60.9)
Special items [Member]
Sales and operating results of reportable segments
Income from continuing operations before income taxes											$ 4.0