Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill for the three months ended December 31, 2017, are (in millions):

	Architecture & Software			Control Products & Solutions			Total
Balance as of September 30, 2017	$	417.2		$	660.5		$	1,077.7
Acquisition of business	6.8			—			6.8
Translation	(0.6		)	(1.6		)	(2.2		)
Balance as of December 31, 2017	$	423.4		$	658.9		$	1,082.3

Schedule of Finite Lived and Indefinite Lived Intangible Assets by Major Class

Other intangible assets consist of (in millions):

	December 31, 2017
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer software products	$	194.8	$	116.1	$	78.7
Customer relationships	114.4		62.8		51.6
Technology	107.4		59.5		47.9
Trademarks	32.4		21.8		10.6
Other	11.4		9.9		1.5
Total amortized intangible assets	460.4		270.1		190.3
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	504.1	$	270.1	$	234.0

	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