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Organization and Plan of Business Operations (FY) (Details) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 18, 2021 $ / shares shares | Dec. 31, 2020 USD ($) Business $ / shares shares | Sep. 30, 2021 USD ($) $ / shares
Organization and Business Operations (Details) [Line Items] |  |  |
Units issued (in shares) | shares | 345,000,000 |  |
Percentage of fair market value trust account |  | 80.00% | 80.00%
Public per share held in the trust account (in Dollars per share) |  | $ 10.00 | $ 10.00
Business combination recognized trust account per share (in Dollars per share) |  | $ 10.00 | $ 10.00
Number of business days prior to completion of business combination |  | 2 days |
Business combination recognized identifiable net tangible assets | $ |  | $ 5,000,001 | $ 5,000,001
Redeem of outstanding shares percentage |  | 100.00% | 100.00%
Period to complete Business Combination from closing of Proposed Public Offering |  | 24 months |
Period to redeem public shares if business combination is not completed within Initial combination period |  | 10 days |
Cash deposited in Trust Account per Unit (in dollars per share) |  | $ 10.00 |
Public per share (in Dollars per share) |  | $ 10.00 | $ 10.00
Going Concern Consideration [Abstract] |  |  |
Cash | $ |  | $ 0 | $ 335,058
Working capital | $ |  | $ 177,743 | $ 422,644
Minimum [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Number of operating businesses included in initial Business Combination | Business |  | 1 |
Maximum [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Percentage of Public Shares that can be redeemed without prior consent |  | 15.00% |
Interest from Trust Account that can be held to pay dissolution expenses | $ |  | $ 100,000 |
Business Combination [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Percentage of outstanding voting securities |  | 50.00% | 50.00%
Public Shares [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Price per unit (in dollars per share) |  | $ 10.00 |
Private Placement Warrants [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Price per unit (in dollars per share) |  | $ 1.50 |
Warrants issued (in shares) | shares |  | 4,666,667 |
Initial Public Offering [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Units issued (in shares) | shares | 34,500,000 | 25,000,000 |
Price per unit (in dollars per share) | $ 10.00 | $ 10.00 |
Private Placement [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Price per unit (in dollars per share) |  |  | $ 1.50
Over-Allotment Option [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Units issued (in shares) | shares |  | 28,750,000 |
Price per unit (in dollars per share) |  | $ 10.00 | $ 10.00
Over-Allotment Option [Member] | Private Placement Warrants [Member] |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |
Price per unit (in dollars per share) |  | $ 1.50 |
Warrants issued (in shares) | shares |  | 5,166,667 |

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