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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