v3.20.2

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 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
Name: | us-gaap_ScheduleOfGoodwillTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
Name: | us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=zi_DiscoverOrgHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |