Goodwill and Other Intangible Assets (Details) $ in Millions	9 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill
Balance as of September 30, 2014	$ 1,050.6
Acquisition of business	14.9
Translation and other	(22.2)
Balance as of June 30, 2015	1,043.3
Finite-lived Intangible Assets Acquired	5.4
Architecture & Software [Member]
Goodwill
Balance as of September 30, 2014	395.6
Acquisition of business	0.0
Translation and other	(4.8)
Balance as of June 30, 2015	390.8
Control Products & Solutions [Member]
Goodwill
Balance as of September 30, 2014	655.0
Acquisition of business	14.9
Translation and other	(17.4)
Balance as of June 30, 2015	$ 652.5