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Earnings Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 17.9	$ 15.9	$ 6.2	$ (40.9)	$ 24.5	$ (33.9)	$ 40.0	$ (50.3)
Add: Net (income) loss attributable to noncontrolling interests	0.0			0.3			0.0	22.2
Net income (loss) attributable to ZoomInfo Technologies Inc.	$ 17.9			$ (40.6)			$ 40.0	$ (28.1)
Basic net income (loss) per share attributable to common stockholders
Basic net income (loss) per share attributable to common stockholders (in dollars per share)	$ 0.04			$ (0.15)			$ 0.10	$ (0.13)
Diluted net income (loss) per share attributable to common stockholders
Diluted net income (loss) per share attributable to common stockholders (in dollars per share)	$ 0.04			$ (0.15)			$ 0.10	$ (0.13)
Class A
Basic net income (loss) per share attributable to common stockholders
Allocation of net income (loss) attributable to ZoomInfo Technologies Inc.				$ (33.2)				$ (18.6)
Weighted average number of shares of Class A and Class C common stock outstanding (in shares)				215,012,710				139,840,047
Basic net income (loss) per share attributable to common stockholders (in dollars per share)				$ (0.15)				$ (0.13)
Diluted net income (loss) per share attributable to common stockholders
Undistributed earnings for basic computation				$ (33.2)				$ (18.6)
Increase in earnings attributable to common shareholders upon conversion of potentially dilutive instruments				(0.1)				0.0
Reallocation of undistributed earnings as a result of conversion of Class C to Class A shares				(7.4)				(9.5)
Allocation of undistributed earnings				$ (40.7)				$ (28.1)
Number of shares used in basic computation (in shares)				215,012,710				139,840,047
Conversion of Class C to Class A common shares outstanding (in shares)				48,273,078				71,058,293
Weighted average shares of Class A and Class C common stock outstanding used to calculate diluted net income (loss) per share (in shares)				263,999,648				210,898,340
Diluted net income (loss) per share attributable to common stockholders (in dollars per share)				$ (0.15)				$ (0.13)
Class A | HSKB II Class 1 Units
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)				121,059				0
Class A | HSKB II Phantom Units
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)				592,801				0
Class C
Basic net income (loss) per share attributable to common stockholders
Allocation of net income (loss) attributable to ZoomInfo Technologies Inc.				$ (7.4)				$ (9.5)
Weighted average number of shares of Class A and Class C common stock outstanding (in shares)				48,273,078				71,058,293
Basic net income (loss) per share attributable to common stockholders (in dollars per share)				$ (0.15)				$ (0.13)
Diluted net income (loss) per share attributable to common stockholders
Undistributed earnings for basic computation				$ (7.4)				$ (9.5)
Increase in earnings attributable to common shareholders upon conversion of potentially dilutive instruments				0.0				0.0
Reallocation of undistributed earnings as a result of conversion of Class C to Class A shares				0.0				0.0
Allocation of undistributed earnings				$ (7.4)				$ (9.5)
Number of shares used in basic computation (in shares)				48,273,078				71,058,293
Conversion of Class C to Class A common shares outstanding (in shares)				0				0
Weighted average shares of Class A and Class C common stock outstanding used to calculate diluted net income (loss) per share (in shares)				48,273,078				71,058,293
Diluted net income (loss) per share attributable to common stockholders (in dollars per share)				$ (0.15)				$ (0.13)
Class C | HSKB II Class 1 Units
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)				0				0
Class C | HSKB II Phantom Units
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)				0				0
Common Stock
Basic net income (loss) per share attributable to common stockholders
Allocation of net income (loss) attributable to ZoomInfo Technologies Inc.	$ 17.9						$ 40.0
Weighted average number of shares of Class A and Class C common stock outstanding (in shares)	401,961,947						401,093,021
Basic net income (loss) per share attributable to common stockholders (in dollars per share)	$ 0.04						$ 0.10
Diluted net income (loss) per share attributable to common stockholders
Undistributed earnings for basic computation	$ 17.9						$ 40.0
Allocation of undistributed earnings	$ 17.9						$ 40.0
Number of shares used in basic computation (in shares)	401,961,947						401,093,021
Weighted average shares of Class A and Class C common stock outstanding used to calculate diluted net income (loss) per share (in shares)	403,471,309						403,277,181
Diluted net income (loss) per share attributable to common stockholders (in dollars per share)	$ 0.04						$ 0.10
Common Stock | Restricted Stock Awards
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)	1,208,236						1,932,054
Common Stock | Exercise of Common Stock Options
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)	178,332						207,917
Common Stock | Employee Stock Purchase Plan
Diluted net income (loss) per share attributable to common stockholders
Units exchangeable for Class A common stock (in shares)	122,794						44,189

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