Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 11.1	$ (12.4)	$ (72.7)	$ (72.5)
Other comprehensive income (loss), net of tax
Unrealized gain (loss) on cash flow hedges	(1.5)	(1.4)	(11.1)	(7.3)
Realized loss (gain) on settlement of cash flow hedges	1.7	0.1	4.0	0.1
Amortization of deferred losses related to the dedesignated Interest Rate Swap	0.0	0.0	3.0	0.0
Other comprehensive income (loss)	0.2	(1.3)	(4.1)	(7.2)
Comprehensive income (loss)	11.3	(13.7)	(76.8)	(79.7)
Less: Net income attributable to ZoomInfo OpCo prior to the Reorganization Transactions	0.0	(13.7)	(12.8)	(79.7)
Less: Comprehensive income (loss) attributable to noncontrolling interests	6.3	0.0	(35.7)	0.0
Comprehensive income (loss) attributable to ZoomInfo Technologies Inc.	$ 5.0	$ 0.0	$ (28.3)	$ 0.0