Stock-based Compensation - Class P Units Activity (Q1) (Details) - Class P Units - shares	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Number of Units
Outstanding beginning balance (in shares)	14,804,507	15,125,429
Cancellations (in shares)	0	(75,922)
Exchanged for Class A common stock (in shares)	(125,000)	(245,000)
Outstanding ending balance (in shares)	14,679,507	14,804,507
Vested (in shares)	14,619,079	14,723,936

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- Definition

Number of options vested.

+ References

No definition available.

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 2
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