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Business Combination - Number of Shares (Q3) (Details) - shares | Jun. 16, 2021 | Sep. 30, 2021 | Jun. 17, 2021 | Dec. 31, 2020
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Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Common stock, outstanding prior to Business Combination (in shares) |  |  | 129,240,910 |
Total shares of common stock issued in the Business Combination (in shares) |  |  | 129,240,910 |
Class A Common Stock |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Common stock, outstanding prior to Business Combination (in shares) |  | 65,677,361 |  | 0
Shares of Class A Common Stock issued in the PIPE Financing (in shares) | 32,500,000 |  |  |
Shares of Class A Common Stock issued in the Business Combination (in shares) | 63,738,563 |  |  |
Total shares of common stock issued in the Business Combination (in shares) |  | 65,677,361 |  | 0
Class V Common Stock |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Common stock, outstanding prior to Business Combination (in shares) |  | 65,502,347 |  | 0
Shares of Class A Common Stock issued in the Business Combination (in shares) | 65,502,347 |  |  |
Shares of Class V Common Stock issued to Legacy WMH equity holders (in shares) | 65,502,347 |  |  |
Total shares of common stock issued in the Business Combination (in shares) |  | 65,502,347 |  | 0
Common Shareholders |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares of common stock (in shares) | 24,988,563 |  |  |
Sponsor | Class A Common Stock |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares of common stock (in shares) | 6,250,000 |  |  |
Silver Spike |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Common stock, outstanding prior to Business Combination (in shares) | 24,998,575 |  |  |
Less: redemption of shares of Silver Spike's Class A common stock (in shares) | 10,012 |  |  |
Total shares of common stock issued in the Business Combination (in shares) | 24,998,575 |  |  |

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