Goodwill and Acquired Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Acquired Finite-Lived Intangible Assets [Line Items]

Intangible Assets

Intangible assets consisted of the following as of June 30, 2020 (in millions):

	Gross Carrying Amount		Accumulated Amortization		Net		Weighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships	$	268.6	$	(43.5)	$	225.1	15.0
Acquired technology	163.9		(73.7)		90.2		6.0
Brand portfolio	4.6		(2.7)		1.9		9.7
Net intangible assets subject to amortization	$	437.1	$	(119.9)	$	317.2
Intangible assets not subject to amortization
Pre-Acquisition ZI brand portfolio	$	33.0	$	—	$	33.0
Goodwill	$	966.8	$	—	$	966.8

DiscoverOrg Holdings

Acquired Finite-Lived Intangible Assets [Line Items]

Intangible Assets

Intangible assets consisted of the following as of December 31, 2019 (in millions):

	Gross Carrying Amount		Accumulated Amortization		Net		Weighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships	$	268.6	$	(34.5)	$	234.1	15
Acquired technology	163.9		(62.5)		101.4		6
Brand portfolio	4.6		(2.5)		2.1		9.7
Net intangible assets subject to amortization	$	437.1	$	(99.5)	$	337.6
Intangible assets not subject to amortization
Pre-Acquisition ZI brand portfolio					$	33.0
Goodwill					$	966.8

Intangible assets consisted of the following as of December 31, 2018 (in millions):

	2018
	Gross Carrying Amount		Accumulated Amortization		Net		Weighted Average Amortization Period in Years
Intangible assets subject to amortization:
Customer relationships	$	95.6	$	(17.4)	$	78.2	14.9
Acquired technology	45.4		(37.5)		7.9		3.9
Brand portfolio	4.6		(2.0)		2.6		9.7
Net intangible assets subject to amortization	$	145.6	$	(56.9)	$	88.7
Intangible assets not subject to amortization
Goodwill					$	445.7

Future Amortization Expense

Future amortization expense for intangible assets as of December 31, 2019 is as follows (in millions):

	Estimate Amortization Expense
For years ended December 31,
2020	$	40.8
2021	$	40.8
2022	$	40.7
2023	$	30.4
2024	$	28.9

A summary of estimated future amortization expense is as follows (in millions):

For the year ending December 31,	2019	$	12.3
	2020	7.5
	2021	7.5
	2022	7.5
	2023	7.4
	Thereafter	46.5
		$	88.7

Changes to Goodwill

The following summarizes changes to the Company’s goodwill (in millions):

Balance at January 1, 2018	$	439.7
Acquisition of NeverBounce	6.0
Balance at December 31, 2018	445.7
Acquisition of ZoomInfo	514.8
Acquisition of Komiko	6.3
Balance at December 31, 2019	$	966.8