Leases - Other Information Related to Leases (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
|
| Leases [Abstract] | |||||
| Cash paid for amounts included in the measurement of operating lease liabilities | $ 2.1 | $ 0.9 | $ 3.8 | $ 1.6 | $ 3.4 |
| Business Acquisition [Line Items] | |||||
| Lease liabilities arising from obtaining right-of-use assets | $ 0.0 | 0.0 | $ 0.1 | 0.2 | $ 3.8 |
| Weighted average remaining lease term | 8 years | 8 years | 8 years 7 months 6 days | ||
| Weighted average discount rate | 6.30% | 6.30% | 6.30% | ||
| From Zoom Information, Inc. acquisition | |||||
| Business Acquisition [Line Items] | |||||
| Lease liabilities arising from obtaining right-of-use assets | $ 0.0 | $ 0.0 | $ 0.0 | $ 28.6 | $ 28.6 |
| DiscoverOrg Holdings | |||||
| Business Acquisition [Line Items] | |||||
| Weighted average remaining lease term | 8 years 7 months 6 days | ||||
| Weighted average discount rate | 6.30% | ||||