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Commitments and Contingencies (Q1) (Details)
3 Months Ended 12 Months Ended
Nov. 01, 2021
USD ($)
$ / shares
Mar. 31, 2024
USD ($)
Demand
shares
Dec. 31, 2023
USD ($)
Demand
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Demand
shares
Dec. 31, 2022
USD ($)
shares
Dec. 29, 2023
USD ($)
shares
Apr. 25, 2023
USD ($)
shares
Underwriting Agreement [Abstract]                
Deferred underwriting fees $ 8,650,000 $ 0 $ 0 $ 0 $ 0 $ 8,650,000    
Recovery of offering costs allocated to warrants   309,534   309,534 309,534 0    
Waiver of deferred underwriter fee   8,340,466   $ 8,340,466 8,340,466      
Marketing Fee Agreement [Abstract]                
Advisory fee   150,000     150,000      
Excise Tax [Abstract]                
Excise tax payable   2,235,006 $ 2,235,006   2,235,006 $ 0    
Minimum [Member]                
Marketing Fee Agreement [Abstract]                
Payment to advisors upon close   $ 2,000,000     $ 2,000,000      
Maximum [Member]                
Registration and Stockholder Rights [Abstract]                
Number of demands eligible security holder can make | Demand   3 3   3      
Marketing Fee Agreement [Abstract]                
Payment to advisors upon close   $ 6,000,000     $ 6,000,000      
IPO [Member]                
Underwriting Agreement [Abstract]                
Deferred underwriting fee per unit (in dollars per share) | $ / shares $ 0.376              
Class A Common Stock [Member]                
Excise Tax [Abstract]                
Common stock subject to possible redemption (in shares) | shares   1,717,578 1,717,578   1,717,578 23,000,000 3,985,213 21,282,422
Aggregate redemption amount   $ 223,500,610 $ 223,500,610   $ 223,500,610   $ 43,640,022 $ 179,860,588
Excise tax liability   1.00% 1.00%   1.00%      
Excise tax payable   $ 2,235,006 $ 2,235,006   $ 2,235,006      
Class B Common Stock [Member]                
Underwriting Agreement [Abstract]                
Increase in income available to common stock   $ 8,650,000     $ 8,650,000