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Leases - Additional Information (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]              
Cash payments on operating leases         $ 9,900,000 $ 9,600,000 $ 8,200,000
Contra rent expense $ 500,000 $ 500,000 $ 1,100,000 $ 1,100,000 $ 2,200,000 $ 1,900,000 200,000
Remaining lease term         6 years 3 months 18 days 6 years 9 months 18 days  
Weighted average discount rate         9.80%    
Operating lease, impairment loss $ 0 $ 0 $ 0 $ 0 $ 10,900,000 $ 600,000 $ 2,400,000
Property, Plant and Equipment [Line Items]              
Impairment charges         3,900,000    
Leasehold improvements              
Property, Plant and Equipment [Line Items]              
Impairment charges         $ 1,300,000