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Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill by Operating Segment

The following table summarizes goodwill by operating and reportable segments (in millions):

						As of December 31, 2020																		As of December 31, 2019																		As of December 31, 2018
						Goodwill						Accumulated Impairment Losses												Carrying Value						Goodwill						Accumulated Impairment Losses												Carrying Value						Goodwill						Accumulated Impairment Losses												Carrying Value
Operating and Reportable Segments:
ASG						$	1,566.3					$	(418.9)											$	1,147.4					$	1,563.4					$	(418.9)											$	1,144.5					$	836.7					$	(418.9)											$	417.8
ISG						114.7						—												114.7						114.4						—												114.4						114.4						—												114.4
PSG						433.2						(31.9)												401.3						432.2						(31.9)												400.3						432.2						(31.9)												400.3
Total						$	2,114.2					$	(450.8)											$	1,663.4					$	2,110.0					$	(450.8)											$	1,659.2					$	1,383.3					$	(450.8)											$	932.5

Schedule of Change in Goodwill

The following table summarizes the change in goodwill (in millions):

Net balance as of December 31, 2018						$	932.5
Addition due to business combination						726.7
Net balance as of December 31, 2019						1,659.2
Addition due to business combination						4.2
Net balance as of December 31, 2020						$	1,663.4

Summary of Intangible Assets, Net

Intangible assets, net, were as follows (in millions):

			As of December 31, 2020
			Original Cost						Accumulated Amortization												Accumulated Impairment Losses						Carrying Value
Customer relationships			$	581.5					$	(411.7)											$	(17.6)					$	152.2
Developed technology			794.7						(532.9)												(2.6)						259.2
IPRD			49.5						—												(25.4)						24.1
Licenses			30.0						—												—						30.0
Other intangibles			79.3						(60.6)												(15.2)						3.5
Total intangible assets			$	1,535.0					$	(1,005.2)											$	(60.8)					$	469.0

			As of December 31, 2019
			Original Cost						Accumulated Amortization												Accumulated Impairment Losses						Carrying Value
Customer relationships			$	585.2					$	(386.8)											$	(20.1)					$	178.3
Developed technology			779.5						(440.3)												(2.6)						336.6
IPRD			64.7						—												(24.1)						40.6
Licenses			30.0						—												—						30.0
Other intangibles			79.3						(59.1)												(15.2)						5.0
Total intangible assets			$	1,538.7					$	(886.2)											$	(62.0)					$	590.5

Summary of Amortization Expense

Amortization expense for intangible assets, with the exception of the $24.1 million of IPRD assets that will be amortized once the corresponding projects have been completed, is expected to be as follows over the next five years, and thereafter (in millions):

			Total
2021			$	99.2
2022			83.8
2023			65.9
2024			54.1
2025			41.1
Thereafter			100.8
Total estimated amortization expense			$	444.9

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Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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