Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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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.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Gain (Loss) On Extinguishment Of Debt, Including Write-Off Of Unamortized Issuance Costs And Prepayment Penalty

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Financing Arrangements - Narrative (Details) - USD ($)						1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
Financing Arrangements - Narrative (Details) - USD ($)	Jun. 17, 2020	Jun. 08, 2020	Feb. 19, 2020	Feb. 01, 2019	Aug. 31, 2017	Sep. 30, 2017	Jun. 30, 2020	Mar. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Feb. 29, 2016
Debt Instrument [Line Items]
Loss on extinguishment of debt									$ 14,900,000	$ 9,400,000
Prepayment of aggregate principal amount									510,900,000	$ 645,400,000
Aggregate principal amount outstanding							$ 756,400,000		756,400,000
Long-term debt, outstanding							743,700,000		743,700,000		$ 1,203,300,000
DiscoverOrg Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt											9,400,000	$ 0
Aggregate principal amount outstanding											1,228,500,000
Long-term debt, outstanding											1,203,300,000	633,700,000
DiscoverOrg Holdings \| Before February 1, 2020
Debt Instrument [Line Items]
Prepayment penalty (as a percent)				2.00%
DiscoverOrg Holdings \| After February 1, 2020 through February 1, 2021
Debt Instrument [Line Items]
Prepayment penalty (as a percent)				1.00%
LIBOR
Debt Instrument [Line Items]
Long-term debt, outstanding							756,400,000		756,400,000
Sale of stock in connection with the acquisition of Pre-Acquisition ZI \| Redeemable Series A Preferred Units
Debt Instrument [Line Items]
Number of shares sold				51,750,000
Proceeds, net of issuance costs				$ 200,200,000
Sale of stock in connection with the acquisition of Pre-Acquisition ZI \| Redeemable Series A Preferred Units \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Number of shares sold				51,800,000
Proceeds, net of issuance costs				$ 200,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				100,000,000.0
Draws on credit facility							0		$ 0		0
Basis spread on variable rate									3.50%
Effective interest rate		3.70%
Repayment of outstanding balance of credit facility		$ 35,000,000.0
Draws on revolving credit loan which trigger springing financial covenant (more than)							35,000,000.0		$ 35,000,000.0
Revolving Credit Facility \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Maximum borrowing capacity				100,000,000
Draws on credit facility											$ 0	0
Draws on revolving credit loan which trigger springing financial covenant (more than) (as a percent)											35.00%
Antares First Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Original issue discount					$ 2,500,000
Debt Issuance Costs, Gross					3,200,000
Goldman Second Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Original issue discount													$ 1,000,000.0
Debt Issuance Costs, Gross													1,800,000
Subordinated Term Loan
Debt Instrument [Line Items]
Debt Issuance Costs, Gross						$ 3,200,000
Term Loan \| Redeemable Series A Preferred Units \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Effective interest rate											15.00%
Term Loan \| First Lien Term Loan
Debt Instrument [Line Items]
Face amount of debt				965,000,000
Basis spread on variable rate									3.75%
Loss on extinguishment of debt			$ 2,200,000						$ 1,700,000
Prepayment of aggregate principal amount	$ 101,200,000						100,000,000.0
Repurchased face amount of debt	100,000,000.0
Accrued interest	$ 1,200,000
Aggregate principal amount outstanding							$ 756,400,000		$ 756,400,000
Effective interest rate							4.60%		4.60%		7.50%
Net leverage ratio (not to exceed)							7.65		7.65
Long-term debt, outstanding							$ 743,700,000		$ 743,700,000		$ 841,600,000
Term Loan \| First Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Face amount of debt				965,000,000
Basis spread on variable rate											4.50%
Prepayment of aggregate principal amount				$ 2,200,000
Effective interest rate											7.50%
Net leverage ratio (not to exceed)											7.65
Long-term debt, outstanding											$ 841,600,000	0
Term Loan \| First Lien Term Loan \| LIBOR
Debt Instrument [Line Items]
Decrease to interest rate			0.50%
Basis spread on variable rate			4.00%
Term Loan \| First Lien Term Loan \| LIBOR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			3.75%
Term Loan \| First Lien Term Loan \| LIBOR \| Minimum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				4.25%
Term Loan \| First Lien Term Loan \| LIBOR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			4.00%
Term Loan \| First Lien Term Loan \| LIBOR \| Maximum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				4.50%
Term Loan \| First Lien Term Loan \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
Term Loan \| First Lien Term Loan \| Base Rate \| Minimum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				3.25%
Term Loan \| First Lien Term Loan \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%
Term Loan \| First Lien Term Loan \| Base Rate \| Maximum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				3.50%
Term Loan \| Second Lien Term Loan
Debt Instrument [Line Items]
Face amount of debt				$ 370,000,000
Basis spread on variable rate									8.50%
Loss on extinguishment of debt		7,300,000
Prepayment of aggregate principal amount		380,600,000
Accrued interest		$ 6,900,000
Effective interest rate		10.80%									11.90%
Prepayment premiums		$ 3,700,000
Write-off of unamortized issuance costs and prepayment penalty incurred		$ 11,000,000.0
Long-term debt, outstanding							$ 0		$ 0		$ 361,700,000
Term Loan \| Second Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Face amount of debt				$ 370,000,000
Basis spread on variable rate											8.50%
Effective interest rate											11.90%
Long-term debt, outstanding											$ 361,700,000	0
Term Loan \| Second Lien Term Loan \| LIBOR \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				8.50%
Term Loan \| Second Lien Term Loan \| Base Rate \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate				7.50%
Term Loan \| Antares First Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Face amount of debt					330,000,000			$ 47,700,000
Basis spread on variable rate											4.50%
Aggregate principal amount outstanding												373,200,000
Long-term debt, outstanding											$ 0	$ 368,600,000
Term Loan \| Antares First Lien Term Loan \| LIBOR \| Minimum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate											4.25%
Term Loan \| Antares First Lien Term Loan \| LIBOR \| Maximum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate											4.50%
Term Loan \| Antares First Lien Term Loan \| Base Rate \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate												0.50%
Term Loan \| Goldman Second Lien Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Face amount of debt													$ 55,000,000.0
Basis spread on variable rate											8.50%
Aggregate principal amount outstanding												$ 149,800,000
Long-term debt, outstanding											$ 0	$ 147,400,000
Increase (decrease) to face amount of debt					$ 75,000,000.0			$ 19,800,000
Term Loan \| Goldman Second Lien Term Loan \| LIBOR \| Minimum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate											8.30%
Term Loan \| Goldman Second Lien Term Loan \| LIBOR \| Maximum \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate											8.50%
Term Loan \| Goldman Second Lien Term Loan \| Base Rate \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Basis spread on variable rate											8.50%	0.50%
Term Loan \| Subordinated Term Loan \| DiscoverOrg Holdings
Debt Instrument [Line Items]
Face amount of debt						$ 100,000,000
Basis spread on variable rate						12.50%					12.50%
Aggregate principal amount outstanding												$ 120,200,000
Long-term debt, outstanding											$ 0	$ 117,700,000