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Initial Public Offering (Q3) (Details) - $ / shares | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Mar. 18, 2021 | Mar. 01, 2021 | Feb. 22, 2021
Public Warrants [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Number of securities called by each unit (in shares) |  |  |  | 0.33 | 0.33
Exercise price (in dollars per share) | $ 11.50 |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Sale of units (in Shares) | 28,750,000 | 34,500,000 |  |  |
Purchase price per share (in dollars per share) | $ 10.00 | $ 10.00 |  |  |
Initial Public Offering [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Purchase price per share (in dollars per share) | $ 10.00 |  | $ 10.00 |  |
Initial Public Offering [Member] | Public Warrants [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Number of securities called by each unit (in shares) | 0.33 | 0.33 |  |  |
Class A Ordinary Shares [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Purchase price per share (in dollars per share) |  | $ 0.0001 |  |  |
Number of securities called by each unit (in shares) |  |  |  | 1 | 1
Number of securities called by each warrant (in shares) |  |  |  | 1 | 1
Exercise price (in dollars per share) |  | $ 11.50 |  |  |
Class A Ordinary Shares [Member] | Initial Public Offering [Member] |  |  |  |  |
Initial Public Offering (Details) [Line Items] |  |  |  |  |
Number of securities called by each unit (in shares) | 1 | 1 |  |  |
Number of securities called by each warrant (in shares) | 1 | 1 |  |  |

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- Definition Per share increase in exercise price of warrant. Excludes change due to standard antidilution provision. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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