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Significant Accounting Policies, Net Income Per Common Stock (FY) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2022
Denominator [Abstract] |  |  |  |  |  |
Weighted average shares outstanding, basic (in shares) |  |  |  |  | 4,915,068 | 5,750,000
Weighted average shares outstanding, diluted (in shares) |  |  |  |  | 4,915,068 | 5,750,000
Basic net income (loss) per share, redeemable common stock (in dollars per share) |  |  |  |  | $ 0.44 | $ 0.4
Diluted net income (loss) per share, redeemable common stock (in dollars per share) |  |  |  |  | $ 0.44 | $ 0.4
Class A Common Stock [Member] |  |  |  |  |  |
Net Income Per Ordinary Share [Abstract] |  |  |  |  |  |
Units issued (in shares) |  |  | 22,700,000 |  |  | 22,700,000
Share price (in dollars per share) | $ 11.5 |  | $ 11.5 |  |  | $ 11.5
Number of shares issued upon exercise of warrant (in shares) | 0 | 0 | 0 | 0 | 0 | 0
Numerator [Abstract] |  |  |  |  |  |
Allocation of net income | $ (881,804) | $ 1,524,478 | $ (497,798) | $ 7,785,699 | $ 1,684,834 | $ 9,224,091
Denominator [Abstract] |  |  |  |  |  |
Weighted average shares outstanding, basic (in shares) | 5,702,791 | 23,000,000 | 12,925,801 | 23,000,000 | 3,843,836 | 23,000,000
Weighted average shares outstanding, diluted (in shares) | 5,702,791 | 23,000,000 | 12,925,801 | 23,000,000 | 3,843,836 | 23,000,000
Basic net income (loss) per share, redeemable common stock (in dollars per share) | $ (0.15) | $ 0.07 | $ (0.04) | $ 0.34 | $ 0.44 | $ 0.4
Diluted net income (loss) per share, redeemable common stock (in dollars per share) | $ (0.15) | $ 0.07 | $ (0.04) | $ 0.34 | $ 0.44 | $ 0.4
Class B Common Stock [Member] |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |
Allocation of net income | $ (889,103) | $ 381,120 | $ (221,444) | $ 1,946,425 | $ 2,144,335 | $ 2,306,023
Denominator [Abstract] |  |  |  |  |  |
Weighted average shares outstanding, basic (in shares) | 5,750,000 | 5,750,000 | 5,750,000 | 5,750,000 | 4,915,068 | 5,750,000
Weighted average shares outstanding, diluted (in shares) | 5,750,000 | 5,750,000 | 5,750,000 | 5,750,000 | 4,915,068 | 5,750,000
Basic net income (loss) per share, redeemable common stock (in dollars per share) | $ (0.15) | $ 0.07 | $ (0.04) | $ 0.34 | $ 0.44 | $ 0.4
Diluted net income (loss) per share, redeemable common stock (in dollars per share) | $ (0.15) | $ 0.07 | $ (0.04) | $ 0.34 | $ 0.44 | $ 0.4

X
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