Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue		$ 110.9	$ 68.5	$ 213.1	$ 123.1
Cost of service:
Cost of service	[1]	28.2	10.2	43.0	19.3
Amortization of acquired technology		5.6	7.4	11.2	13.0
Gross profit		77.1	50.9	158.9	90.8
Operating expenses:
Sales and marketing	[1]	59.5	20.5	93.6	38.8
Research and development	[1]	16.4	8.9	26.3	14.1
General and administrative	[1]	18.2	10.1	28.2	16.8
Amortization of other acquired intangibles		4.7	4.6	9.3	8.3
Restructuring and transaction related expenses		9.5	1.2	12.4	9.0
Total operating expenses		108.3	45.3	169.8	87.0
Income (loss) from operations		(31.2)	5.6	(10.9)	3.8
Interest expense, net		25.1	26.9	49.6	50.4
Loss on debt extinguishment		12.7	0.0	14.9	18.2
Other (income) expense, net		0.1	0.0	0.0	0.0
Income (loss) before income taxes		(69.1)	(21.3)	(75.4)	(64.8)
Benefit (expense) from income taxes		(8.8)	1.4	(8.4)	4.7
Net income (loss)		(77.9)	(19.9)	(83.8)	(60.1)
Less: Net income (loss) attributable to ZoomInfo OpCo prior to the Reorganization Transactions		0.8	(19.9)	(5.1)	(60.1)
Less: Net income (loss) attributable to noncontrolling interests		(44.3)	0.0	(44.3)	0.0
Net income (loss) attributable to ZoomInfo Technologies Inc.		$ (34.4)	$ 0.0	$ (34.4)	$ 0.0
Net income (loss) per share of Class A and Class C common stock:
Basic (in dollars per share)	[2]	$ (0.30)		$ (0.30)
Diluted (in dollars per share)	[2]	$ (0.30)		$ (0.30)
Cost of service [Extensible List]				us-gaap:ServiceMember

[1] Amounts include equity-based compensation expense, as follows: Cost of service $15.3 $0.7 $17.0 $1.9  Sales and marketing 32.0 1.4 38.4 4.1  Research and development 8.5 2.6 10.1 2.9  General and administrative 8.7 1.3 10.3 2.7  Total equity-based compensation expense $64.5 $6.0 $75.8 $11.6 

[2] Basic and diluted net income (loss) per share of Class A and Class C common stock is applicable only for the period from June 4, 2020 through June 30, 2020, which is the period following the initial public offering ("IPO") and related Reorganization Transactions (as defined in Note 1 to the Unaudited Consolidated Financial Statements). See Note 12 for the number of shares used in the computation of net income (loss) per share of Class A and Class C common stock and the basis for the computation of net income (loss) per share.