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Members' Equity, Unvested Class A-3 and Class B Units (FY) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Remaining Unrecognized          
Compensation cost $ 4,887,000 $ 24,320,000      
Class A-3 Units/ Class B Units          
Number of Units          
Beginning balance (in shares)   40,702 56,679 62,024  
Granted (in shares)     14,250 25,990  
Vested (in shares)     (28,616) (24,051)  
Cancelled (in shares)     (1,611) (7,284)  
Ending balance (in shares)     40,702 56,679 62,024
Weighted - Average Grant Date Fair Value          
Beginning balance (in dollars per share)   $ 518.13 $ 373.47 $ 236.37  
Granted (in dollars per share)     724.28 531.80  
Vested (in dollars per share)     359.45 231.74  
Cancelled (in dollars per share)     450.83 238.87  
Ending balance (in dollars per share)     $ 518.13 $ 373.47 $ 236.37
Weighted - Average Remaining Years to Vest          
Outstanding (in years)     2 years 4 months 17 days 2 years 7 months 24 days 3 years 1 month 2 days
Remaining Unrecognized          
Outstanding     $ 22,474,033 $ 18,682,331 $ 12,215,953
Compensation cost     $ 0 $ 0  
Requisite service period (Years)     4 years