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Revenue Recognition - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) term course	Dec. 31, 2023 USD ($)
Graduation Fund [Line Items]
Number of free courses | course	1
Number of successfully completed courses | course	3
Consecutive terms of non attendance in which Graduation Fund credits will be lost | term	1
Contract liabilities, tuition cap	$ 14.5	$ 11.8
Graduation Fund | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Graduation Fund [Line Items]
Performance obligation expected timing of satisfaction	12 months
Revenue remaining performance obligation	$ 18.6
Tuition Cap | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Graduation Fund [Line Items]
Performance obligation expected timing of satisfaction	12 months
Revenue remaining performance obligation	$ 5.2
Minimum | Graduation Fund | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Graduation Fund [Line Items]
Performance obligation expected timing of satisfaction	2 years
Minimum | Australia / New Zealand
Graduation Fund [Line Items]
Deferred contract costs, amortization period	1 year
Maximum | Graduation Fund | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Graduation Fund [Line Items]
Performance obligation expected timing of satisfaction	4 years
Maximum | Australia / New Zealand
Graduation Fund [Line Items]
Deferred contract costs, amortization period	2 years

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- Definition

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+ References

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Contract With Customer, Liability, Current, Tuition Cap

+ References

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