Goodwill and Other Intangible Assets

12 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

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



	Architecture & Software			Control Products & Solutions			Total
Balance as of September 30, 2018	$	422.3		$	653.2		$	1,075.5
Acquisition of businesses	14.6			—			14.6
Translation	(4.6		)	(14.4		)	(19.0		)
Balance as of September 30, 2019	432.3			638.8			1,071.1
Acquisition of business	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

Other intangible assets consist of (in millions):



	September 30, 2020
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer 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



	September 30, 2019
	Carrying Amount		Accumulated Amortization		Net
Amortized intangible assets:
Computer software products	$	190.6	$	128.3	$	62.3
Customer relationships	110.5		69.2		41.3
Technology	110.4		69.5		40.9
Trademarks	31.4		26.4		5.0
Other	10.6		9.7		0.9
Total amortized intangible assets	453.5		303.1		150.4
Allen-Bradley^® trademark not subject to amortization	43.7		—		43.7
Total	$	497.2	$	303.1	$	194.1

Computer software products represent costs of computer software to be sold, leased or otherwise marketed. Computer software products amortization expense was $10.2 million in 2020, $10.4 million in 2019 and $11.8 million in 2018.

Estimated amortization expense is $53.9 million in 2021, $51.0 million in 2022, $49.7 million in 2023, $46.8 million in 2024 and $44.6 million in 2025.

For our 2020 annual evaluation, we performed a qualitative test for our Architecture & Software and our Control Products & Solutions (excluding Sensia) reporting units. We performed a quantitative test for our Sensia reporting unit. Based on those evaluations, we concluded these assets were not impaired. We also assessed the changes in events and circumstances subsequent to our annual test, including those related to the COVID-19 pandemic and conditions within the Oil & Gas industry, and concluded that a triggering event which would require interim quantitative testing has not occurred.