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Significant Accounting Policies (Q3) (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021
Significant Accounting Policies (Details) [Line Items] |  |
Cash | $ 0 | $ 335,058
Held in marketable securities |  | 345,030,985
Federal depository insurance coverage |  | 250,000
Net tangible assets |  | $ 5,000,001
Purchase of ordinary shares (in Shares) | 0 | 61,833,333
Shareholders equity value |  | $ 20,169,599
Underwriting fee |  | 6,900,000
Deferred underwriting fee |  | 12,075,000
Other offering cost |  | 1,194,599
Transaction costs |  | $ 719,201
Common stock [Member] |  |
Significant Accounting Policies (Details) [Line Items] |  |
Number of shares issued (in Shares) |  | 17,433,333
Initial Public Offering [Member] |  |
Significant Accounting Policies (Details) [Line Items] |  |
Number of shares issued (in Shares) |  | 11,500,000
Private Placement [Member] |  |
Significant Accounting Policies (Details) [Line Items] |  |
Number of shares issued (in Shares) |  | 5,933,333

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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