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Business Combination - Additional Information (FY) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 16, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid to Legacy WMH equity holders |  |  |  |  |  |  |  |  |  |  | $ 455,182
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 129,240,910 |  |  | 129,240,910
Period of exchange agreement | 180 days |  |  |  |  |  |  |  |  |  |
Shares converted basis (in shares) | 1 |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to WM Technology, Inc. |  | $ 716 | $ 1,226 | [1] | $ 1,956 | $ (1,249) | [1] | $ 137,100 | $ (9,898) | $ (115,989) | $ 60,383
Change in valuation inputs or other assumptions |  | (460) | 1,045 | [1] | 390 | 320 | [1] | (166,500) | (1,505) | (25,370) | (166,518)
Share-based compensation expense |  | $ 2,752 | $ 3,709 |  | $ 5,571 | $ 8,092 |  | 29,300 | $ 13,515 | $ 23,493 | 29,324
Transaction costs allocated to warrants |  |  |  |  |  |  |  | $ 5,500 |  |  | $ 5,547
WMH LLC |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contributions made | $ 80,300 |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 32,500,000 |  |  |  |  |  |  |  |  |  |
Price per share (in dollars per share) | $ 10 |  |  |  |  |  |  |  |  |  |
Consideration received on transaction | $ 325,000 |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) | 10,012 |  |  |  |  |  |  |  |  |  |
Cash consideration paid to Legacy WMH equity holders | $ 455,200 |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 96,948,250 |  |  | 96,948,250 |  |  |  | 94,383,053 | 92,062,468 |
Proceeds and shares issued in business combination (in shares) |  |  |  |  |  |  |  | 63,738,563 |  |  |
Payment to continuing members as percent of amount of tax benefit |  | 85.00% |  |  | 85.00% |  |  |  | 85.00% |  |
Class V Shares |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 65,502,347 |  |  |  |  |  |  |  |  |  |
Class P Units |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 25,896,042 |  |  |  |  |  |  |  |  |  |
Class V Common Stock |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 55,486,361 |  |  | 55,486,361 |  |  |  | 55,486,361 | 55,486,361 |
Proceeds and shares issued in business combination (in shares) | 65,502,347 |  |  |  |  |  |  |  |  |  |
Legacy WMH Class A Unit holders | Silver Spike |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests held (over 50%) |  |  |  |  |  |  |  |  | 50.00% |  |
[1] | For the three and six months ended June 30, 2023, net revenues and general and administrative expenses have been retrospectively adjusted to reflect the restatement of previously reported revenue and credit losses. See Note 2, “Summary of Significant Accounting Policies,” for further information.

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