Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Changes in the carrying amount of goodwill for the years ended September 30, 2017 and 2016 were (in millions):

	Architecture & Software			Control Products & Solutions			Total
Balance as of September 30, 2015	$	388.0		$	640.8		$	1,028.8
Acquisition of businesses	35.0			37.7			72.7
Translation	(8.5		)	(19.1		)	(27.6		)
Balance as of September 30, 2016	414.5			659.4			1,073.9
Acquisition of business	—			0.8			0.8
Divestiture of business (Note 13)	—			(10.3		)	(10.3		)
Translation	2.7			10.6			13.3
Balance as of September 30, 2017	$	417.2		$	660.5		$	1,077.7

Other intangible assets

Other intangible assets consist of (in millions):

	September 30, 2017
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer software products	$	194.8	$	113.2	$	81.6
Customer relationships	114.5		61.5		53.0
Technology	104.8		57.9		46.9
Trademarks	32.3		21.1		11.2
Other	11.4		9.8		1.6
Total amortized intangible assets	457.8		263.5		194.3
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	501.5	$	263.5	$	238.0

	September 30, 2016
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer software products	$	182.4	$	103.4	$	79.0
Customer relationships	112.6		51.9		60.7
Technology	103.9		48.5		55.4
Trademarks	31.4		17.0		14.4
Other	11.0		8.9		2.1
Total amortized intangible assets	441.3		229.7		211.6
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	485.0	$	229.7	$	255.3