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Business Combination - Additional Information (Q3) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 16, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 17, 2021
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid to Legacy WMH equity holders |  |  |  |  |  |  |  |  | $ 455,182,000 |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,240,910
Period of exchange agreement | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |
Shares converted basis (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to WM Technology, Inc. |  | $ 58,700,000 | $ 20,835,000 |  | $ 7,731,000 | $ 15,530,000 | $ 9,393,000 | $ 3,809,000 | 25,098,000 | $ 28,732,000 | $ 38,829,993 | $ (375,685) | $ 12,679,511 |
Change in fair value of warrant liability |  | 83,600,000 | 45,837,000 |  |  | $ 0 |  |  | 83,628,000 | $ 0 |  |  |  |
Share-based compensation expense |  | 23,600,000 | $ 4,192,000 |  |  |  |  |  | 23,625,000 |  |  |  |  |
Add: transaction costs allocated to Warrants |  | $ 5,500,000 |  |  |  |  |  |  | $ 5,547,000 |  |  |  |  |
WMH LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions made | $ 80,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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) | $ 10.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration received on transaction | $ 325,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock redeemed during period (in shares) | 10,012 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid to Legacy WMH equity holders | $ 455,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 65,677,361 | 65,677,361 |  |  |  |  |  | 65,677,361 |  | 0 |  |  |
Shares of Class A Common Stock issued in the 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 A Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 63,738,563 | 0 |  |  |  |  |  |  |  |  |
Shares of Class A Common Stock issued in the Business Combination (in shares) |  |  |  | 63,738,563 |  |  |  |  |  |  |  |  |  |
Class V Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 65,502,347 | 65,502,347 |  |  |  |  |  | 65,502,347 |  | 0 |  |  |
Shares of Class A Common Stock issued in the Business Combination (in shares) | 65,502,347 |  |  |  |  |  |  |  |  |  |  |  |  |
Class V Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  | 65,502,347 | 0 |  |  |  |  |  |  |  |  |
Shares of Class A Common Stock issued in the Business Combination (in shares) |  |  |  | 65,502,347 |  |  |  |  |  |  |  |  |  |

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