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Organization and Business Operations (Q3) (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 28, 2021 | Mar. 18, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Organization and Business Operations (Details) [Line Items] |  |  |  |
Units of initial public offering (in Shares) |  | 345,000,000 |  |
Transaction costs |  |  |  | $ 20,169,599
Underwriting fee |  |  |  | 6,900,000
Deferred underwriting fee |  |  |  | 12,075,000
Offering costs |  |  |  | 1,194,599
Non-operating expense |  |  |  | $ 719,201
Percentage of redemption of company's outstanding public shares |  |  |  | 100.00%
Percentage of fair market value trust account |  |  | 80.00% | 80.00%
Business combination recognized trust account per share (in Dollars per share) |  |  | $ 10.00 | $ 10.00
Business combination recognized identifiable net tangible assets |  |  | $ 5,000,001 | $ 5,000,001
Redeem of outstanding shares percentage |  |  | 100.00% | 100.00%
Public per share (in Dollars per share) |  |  | $ 10.00 | $ 10.00
Public per share held in the trust account (in Dollars per share) |  |  | $ 10.00 | $ 10.00
Working capital |  |  | $ 177,743 | $ 422,644
Amounts of operating bank account |  |  |  | $ 335,058
Subsequent Event [Member] |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |
Working capital loans | $ 1,500,000 |  |  |
Business Combination [Member] |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |
Percentage of outstanding voting securities |  |  | 50.00% | 50.00%
Initial Public Offering [Member] |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |
Units of initial public offering (in Shares) |  | 34,500,000 | 25,000,000 |
Price per unit (in dollars per share) |  | $ 10.00 | $ 10.00 |
Generating gross proceeds |  | $ 345,000,000 |  |
Private sale of warrants (in Shares) |  |  |  | 11,500,000
Private Placement [Member] |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |
Price per unit (in dollars per share) |  |  |  | $ 1.50
Private sale of warrants (in Shares) |  |  |  | 5,933,333
Private Placement [Member] | Founder Shares [Member] |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |
Sale of units |  |  |  | $ 25,000

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