Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Unbilled receivables for performance-based enrollment fees	$ 10.7		$ 20.9
Accrued payments for revenue share	21.6		$ 29.8
Revenue recognized that was previously deferred	$ 41.6	$ 34.9
Two Customers \| Accounts receivable and unbilled receivables \| Customer concentration risk
Disaggregation of Revenue [Line Items]
Revenue percent	74.60%		74.60%
Accounts receivable and unbilled receivables	$ 9.8		$ 17.6

Accounts Receivable And Contract With Customer, Asset, Unbilled Receivable, After Allowance For Credit Loss, Current

No definition available.

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- Definition

Contract With Customer, Asset, After Allowance For Credit Loss, Unbilled Receivable, Current

+ References

No definition available.

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- Definition

Contract with Customer, Liability, Revenue Share

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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