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Related Party Transactions, Related Party Loans (FY) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 01, 2023
May 09, 2023
Dec. 31, 2022
Related Party Loans [Abstract]          
Promissory note - related party $ 2,150,000 $ 1,875,000     $ 0
Sponsor, Affiliate of Sponsor, or Certain Company Officers and Directors [Member] | Working Capital Loans [Member]          
Related Party Loans [Abstract]          
Maximum amount of convertible loans $ 1,500,000 $ 1,500,000      
Conversion price (in dollars per share) $ 1 $ 1      
Promissory Note [Member]          
Related Party Loans [Abstract]          
Promissory note - related party $ 1,500,000 $ 1,500,000     $ 0
Promissory Note [Member] | Maximum [Member]          
Related Party Loans [Abstract]          
Principal amount 1,500,000 1,500,000 $ 1,500,000 $ 1,500,000  
Second Promissory Note [Member]          
Related Party Loans [Abstract]          
Promissory note - related party $ 650,000 $ 375,000      
Second Promissory Note [Member] | Maximum [Member]          
Related Party Loans [Abstract]          
Principal amount     $ 1,500,000