XML 83 R75.htm IDEA: XBRL DOCUMENT v3.19.2

Fair Value of Financial Instruments - Contingent Consideration (Details) - Tradeweb Markets LLC - Predecessor	Dec. 31, 2017 item
Standard deviation
Fair Value of Financial Instruments
Contingent consideration, measurement input	1,666,667
Revenue multiple
Fair Value of Financial Instruments
Contingent consideration, measurement input	7.03
Discount rate
Fair Value of Financial Instruments
Contingent consideration, measurement input	0.0164

X

- Definition

Value of input used to measure contingent consideration liability due to related parties.

+ References

No definition available.

+ Details

Name:	tw_ContingentConsiderationLiabilityDueToRelatedPartiesMeasurementInput
Namespace Prefix:	tw_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=tw_TradewebMarketsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRevenueMultipleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDefaultRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: