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Class A Ordinary Shares Subject to Possible Redemption (Q3) (Details) | 9 Months Ended
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Sep. 30, 2021 USD ($) shares
IPO [Member] |
Class A Ordinary Shares Subject to Possible Redemption (Details) [Line Items] |
Accretion amount | $ | $ 31,410,398
Class A Ordinary Shares [Member] |
Class A Ordinary Shares Subject to Possible Redemption (Details) [Line Items] |
Shares subject to possible redemption (in shares) | shares | 34,500,000

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