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Stock-based Compensation - Additional Information (Q3) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 16, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period of exchange agreement | 180 days |  |  |  |
Shares converted basis (in shares) | 1 |  |  |  |
Share-based compensation expense |  | $ 4,192 | $ 23,600 |  | $ 23,625
Incremental expense |  |  |  | $ 4,100 |
Class P Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Nonvested award, cost not yet recognized |  | 5,000 | 5,000 |  | $ 5,000
Nonvested award, period for recognition |  |  |  |  | 2 years 2 months 12 days
Share-based compensation expense |  | 700 |  |  | $ 20,100
Restricted stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Nonvested award, cost not yet recognized |  | 51,900 | $ 51,900 |  | $ 51,900
Nonvested award, period for recognition |  |  |  |  | 3 years 9 months 18 days
Stock-based compensation expense |  | $ 3,500 |  |  | $ 3,500
Class V Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Class A Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Class A Common Stock | 2021 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) |  | 19,209,986 | 19,209,986 |  | 19,209,986
Period of automatic increase of shares |  |  |  |  | 10 years
Percent of increase in shares from capital stock outstanding |  | 5.00% | 5.00% |  | 5.00%
Number of shares available for future issuance (in shares) |  | 15,108,441 | 15,108,441 |  | 15,108,441

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