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Non-Controlling Interests - Summary of Ownership Interest (Details)	6 Months Ended
	Jun. 30, 2022 shares	Jun. 30, 2021 shares	Dec. 31, 2021
Class A Common Stock
Non-Controlling Interests
Conversion ratio	1
Class B Common Stock
Non-Controlling Interests
Conversion ratio	1
Tradeweb Markets LLC
Non-Controlling Interests
Number of LLC Interests held by Tradeweb Markets Inc. (in shares)	204,548,887	202,086,400
Number of LLC Interests held by non-controlling interests (in shares)	29,971,658	30,531,933
Total LLC Interests outstanding (in shares)	234,520,545	232,618,333
Number of LLC Interests held by Tradeweb Markets Inc.	87.20%	86.90%	86.90%
Number of LLC Interests held by non-controlling interests	12.80%	13.10%	13.10%
Total LLC Interests outstanding	100.00%	100.00%

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- Definition

The equity interest of noncontrolling shareholders.

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- Definition

The parent entity's interest in the subsidiary.

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- Definition

The total number of shares of the subsidiary.

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- Definition

The total ownership interest on noncontrolling interest expressed as a percentage.

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- Definition

The conversion ratio of shares of non-controlling interests.

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- 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.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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