Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Goodwill
Beginning Balance	$ 948.8	$ 952.6
Acquisition of businesses	71.1		34.8
Translation and other	3.1	(3.8)
Ending Balance	1,023.0	948.8	952.6
Architecture and Software [Member]
Goodwill
Beginning Balance	387.7	386.7
Acquisition of businesses
Translation and other	0.1	1.0
Ending Balance	387.8	387.7
Control Products and Solutions [Member]
Goodwill
Beginning Balance	561.1	565.9
Acquisition of businesses	71.1
Translation and other	3.0	(4.8)
Ending Balance	$ 635.2	$ 561.1