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Summary of Significant Accounting Policies - Additional Information (FY) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
institution
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
segment
institution
shares
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
financialInstitutions
segment
shares
Dec. 31, 2022
USD ($)
financialInstitutions
Dec. 31, 2021
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Jul. 16, 2021
$ / shares
Jun. 16, 2021
$ / shares
Dec. 31, 2020
USD ($)
Accounting Policies [Line Items]                        
Allowance of bad debt $ 2,756,000 $ 10,202,000 $ 2,756,000 $ 10,202,000 $ 8,748,000 $ 12,232,000 $ 5,169,000 $ 6,596,000 $ 11,822,000     $ 857,000
Equity securities without readily determinable fair value           3,500,000            
Impairment         3,500,000 3,000,000 0          
Impairment charges         3,900,000              
Internal-use software development costs 2,800,000 1,700,000 5,300,000 3,200,000 7,700,000 5,100,000 100,000          
Amortization expense for intangible assets 100,000 500,000 300,000 1,100,000 7,800,000 2,700,000 1,300,000          
Capitalized computer software, accumulated amortization         12,900,000 5,100,000            
Intangible asset impairment charges         6,100,000 0 0          
ROU asset impairment charges $ 0 0 $ 0 0 $ 10,900,000 600,000 2,400,000          
Tax receivable agreement liabilities as percent of expected benefit 85.00%   85.00%   85.00%              
Tax receivable agreement, percent recorded in additional paid-in capital 15.00%   15.00%   15.00%              
Sales discount $ 2,245,000 3,239,000 [1] $ 4,547,000 6,733,000 [1] $ 12,527,000 15,407,000 7,938,000          
Advertising expense 3,800,000 3,500,000 $ 6,300,000 4,600,000 $ 11,800,000 14,400,000 17,700,000          
Requisite service period     2 years   2 years              
Defined contribution cost $ 500,000 400,000 $ 900,000 900,000 $ 2,300,000 2,400,000 1,500,000          
Discharge of holdback obligation related to prior acquisition, operating activities         $ 3,705,000 $ 0 0          
Number of operating segments | segment     1   1              
Number of reportable segments | segment     1   1              
Number of financial institutions with cash balance exceeding FDIC limit 4   4   5 4            
Sales Discount                        
Accounting Policies [Line Items]                        
Sales discount $ 300,000 $ 1,100,000 $ 500,000 $ 2,200,000 $ 4,200,000 $ 4,500,000 2,600,000          
Maximum                        
Accounting Policies [Line Items]                        
Employer matching contribution, percent of match     3.50%   3.50%              
Class A Common Stock, $0.0001 par value per share                        
Accounting Policies [Line Items]                        
Right to purchase shares (in shares) | shares         1              
Exercise price of warrant (in dollars per share) | $ / shares                   $ 11.5 $ 11.5  
Minimum requirement for cash settlement as percent of stockholders                     50.00%  
Payment to continuing members as percent of amount of tax benefit 85.00%   85.00%   85.00%              
Public Warrants                        
Accounting Policies [Line Items]                        
Origination warrants (in shares) | shares         12,499,993              
Warrants outstanding (in shares) | shares 12,499,973   12,499,973   12,499,973              
Private Placement Warrants                        
Accounting Policies [Line Items]                        
Origination warrants (in shares) | shares         7,000,000              
Warrants outstanding (in shares) | shares 7,000,000   7,000,000   7,000,000              
Property, Plant and Equipment                        
Accounting Policies [Line Items]                        
Impairment charges         $ 2,700,000 0 $ 0          
Computer equipment                        
Accounting Policies [Line Items]                        
Property and equipment, useful life 3 years   3 years   3 years              
Furniture and fixtures                        
Accounting Policies [Line Items]                        
Property and equipment, useful life 7 years   7 years   7 years              
Leasehold improvements                        
Accounting Policies [Line Items]                        
Impairment charges         $ 1,300,000              
Software technology                        
Accounting Policies [Line Items]                        
Property and equipment, useful life 3 years   3 years   3 years              
Amortization expense for intangible assets         $ 13,100,000 $ 15,500,000            
Enhancements                        
Accounting Policies [Line Items]                        
Property and equipment, useful life 3 years   3 years   3 years              
Customer Concentration Risk | Accounts Receivable | Customer One                        
Accounting Policies [Line Items]                        
Concentration risk, percentage           11.00%            
[1] For the three and six months ended June 30, 2023, net revenues and general and administrative expenses have been retrospectively adjusted to reflect the restatement of previously reported revenue and credit losses. See Note 2, “Summary of Significant Accounting Policies,” for further information.