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Significant Accounting Policies - Schedule of diluted loss per ordinary share (Q3) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2021
Numerator: |  |  |
Net income allocable to Class A ordinary shares subject to possible redemption |  | $ 6,205,927 | $ 3,803,233
Denominator: |  |  |
Weighted Average Redeemable Class A Ordinary shares, Basic and Diluted (in shares) |  | 34,500,000 | 24,895,604
Basic and Diluted net income per share, Redeemable Class A Ordinary shares (in dollars per share) | $ 0 | $ 0.18 | $ 0.15
Numerator: |  |  |
Net income allocable to Class B ordinary shares not subject to redemption |  | $ 1,551,482 | $ 1,218,711
Denominator: |  |  |
Weighted Average Non-Redeemable Ordinary shares, Basic and Diluted (in shares) |  | 8,625,000 | 7,977,564
Basic and diluted net loss per ordinary share (in dollars per share) | $ 0 | $ 0.18 | $ 0.15

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1337-109256 + Details
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- Definition Amount of Net Income (Loss) attributable to redeemable noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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- Definition Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders. + References No definition available. + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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