Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Goodwill
Beginning Balance	$ 1,023.0	$ 948.8
Acquisition of businesses	35.7	71.1
Translation and other	(8.1)	3.1
Ending Balance	1,050.6	1,023.0
Architecture and Software [Member]
Goodwill
Beginning Balance	387.8	387.7
Acquisition of businesses	7.7
Translation and other	0.1	0.1
Ending Balance	395.6	387.8
Control Products and Solutions [Member]
Goodwill
Beginning Balance	635.2	561.1
Acquisition of businesses	28.0	71.1
Translation and other	(8.2)	3.0
Ending Balance	$ 655.0	$ 635.2