| Cover | Dec. 05, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 14, 2022 |
| Entity Registrant Name | Tradeweb Markets Inc. |
| Entity Central Index Key | 0001758730 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38860 |
| Entity Tax Identification Number | 83-2456358 |
| Entity Address, Address Line One | 1177 Avenue of the Americas |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10036 |
| City Area Code | 646 |
| Local Phone Number | 430-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.00001 |
| Trading Symbol | TW |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
