Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Changes in the carrying amount of goodwill were (in millions):

	Architecture & Software			Control Products & Solutions			Total
Balance as of September 30, 2016	$	414.5		$	659.4		$	1,073.9
Acquisition of businesses	—			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
Acquisition of business	6.8			—			6.8
Translation	(1.7		)	(7.3		)	(9.0		)
Balance as of September 30, 2018	$	422.3		$	653.2		$	1,075.5

Other intangible assets

Other intangible assets consist of (in millions):

	September 30, 2018
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer software products	$	190.9	$	118.1	$	72.8
Customer relationships	112.9		66.2		46.7
Technology	106.8		64.0		42.8
Trademarks	32.0		24.0		8.0
Other	11.2		10.0		1.2
Total amortized intangible assets	453.8		282.3		171.5
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	497.5	$	282.3	$	215.2

	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