Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

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

	Architecture & Software		Control Products & Solutions		Intelligent Devices		Software & Control		Lifecycle Services		Total
Balance as of September 30, 2019	$	432.3	$	638.8	$	—	$	—	$	—	$	1,071.1
Acquisition of businesses	161.2		390.7		—		—		—		551.9
Translation	15.9		11.4		—		—		—		27.3
Balance as of September 30, 2020	609.4		1,040.9		—		—		—		1,650.3
Reallocation due to change in segments	(609.4)		(1,040.9)		535.1		497.3		617.9		—
Acquisition of businesses	—		—		—		1,937.3		12.8		1,950.1
Translation	—		—		8.0		12.9		4.6		25.5
Balance as of September 30, 2021	$	—	$	—	$	543.1	$	2,447.5	$	635.3	$	3,625.9

Other Intangible Assets

Other intangible assets consist of (in millions):

	September 30, 2021
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Software products	$	90.4	$	43.2	$	47.2
Customer relationships	595.9		75.4		520.5
Technology	420.8		71.7		349.1
Trademarks	73.8		13.3		60.5
Other	7.1		6.3		0.8
Total amortized intangible assets	1,188.0		209.9		978.1
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	1,231.7	$	209.9	$	1,021.8

	September 30, 2020
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Software products	$	192.7	$	139.0	$	53.7
Customer relationships	351.3		92.5		258.8
Technology	165.8		84.0		81.8
Trademarks	71.7		31.3		40.4
Other	14.4		13.5		0.9
Total amortized intangible assets	795.9		360.3		435.6
Allen-Bradley® trademark not subject to amortization	43.7		—		43.7
Total	$	839.6	$	360.3	$	479.3