Goodwill and Purchased Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The Company's goodwill activity was as follows (in millions):

	Amount
December 31, 2021	$	3,762.1
Other (*)	(27.7)
December 31, 2022	3,734.4
Other	—
December 31, 2023	$	3,734.4

______________________

(*) Other primarily consists of $28.9 million reduction in goodwill due to the divestiture of the Company's silicon photonics business.

Schedule of Acquired Indefinite-Lived Intangible Assets by Major Class

The Company’s purchased intangible assets, net, were as follows (in millions):

	As of December 31, 2023								As of December 31, 2022
	Gross		Accumulated Amortization		Accumulated Impairments and Other Charges		Net		Gross		Accumulated Amortization		Accumulated Impairments and Other Charges		Net
Finite-lived intangible assets:
Technologies and patents	$	913.1	$	(779.1)	$	(55.1)	$	78.9	$	913.1	$	(721.3)	$	(55.1)	$	136.7
Customer contracts, support agreements, and related relationships	136.3		(120.9)		(2.8)		12.6		136.3		(111.2)		(2.8)		22.3
Trade names and other	9.6		(9.3)		—		0.3		9.6		(8.1)		—		1.5
Total purchased intangible assets	$	1,059.0	$	(909.3)	$	(57.9)	$	91.8	$	1,059.0	$	(840.6)	$	(57.9)	$	160.5

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The Company’s purchased intangible assets, net, were as follows (in millions):

	As of December 31, 2023								As of December 31, 2022
	Gross		Accumulated Amortization		Accumulated Impairments and Other Charges		Net		Gross		Accumulated Amortization		Accumulated Impairments and Other Charges		Net
Finite-lived intangible assets:
Technologies and patents	$	913.1	$	(779.1)	$	(55.1)	$	78.9	$	913.1	$	(721.3)	$	(55.1)	$	136.7
Customer contracts, support agreements, and related relationships	136.3		(120.9)		(2.8)		12.6		136.3		(111.2)		(2.8)		22.3
Trade names and other	9.6		(9.3)		—		0.3		9.6		(8.1)		—		1.5
Total purchased intangible assets	$	1,059.0	$	(909.3)	$	(57.9)	$	91.8	$	1,059.0	$	(840.6)	$	(57.9)	$	160.5

Schedule of Estimated Future Amortization Expense of Purchased Intangible Assets with Finite Lives

As of December 31, 2023, the estimated future amortization expense of purchased intangible assets with finite lives was as follows (in millions):

Years Ending December 31,	Amount
2024	$	49.2
2025	39.6
2026	3.0
2027	—
2028	—
Total	$	91.8