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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 ($) institution segment shares | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) segment financialInstitutions shares | Dec. 31, 2022 USD ($) 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.

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