Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 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
Tuition Cap
Graduation Fund [Line Items]
Contract liabilities	$ 13.5	$ 11.8
Tuition Cap | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Graduation Fund [Line Items]
Performance obligation expected timing of satisfaction	12 months
Revenue remaining performance obligation	$ 5.3
Graduation Fund
Graduation Fund [Line Items]
Expected collection period of tuition receivable	12 months
Graduation fund estimated to be redeemed	$ 19.0
Minimum | Graduation Fund
Graduation Fund [Line Items]
Expected collection period of tuition receivable, noncurrent	2 years
Minimum | Australia / New Zealand
Graduation Fund [Line Items]
Deferred acquisition costs, amortization period	1 year
Maximum | Graduation Fund
Graduation Fund [Line Items]
Expected collection period of tuition receivable, noncurrent	4 years
Maximum | Australia / New Zealand
Graduation Fund [Line Items]
Deferred acquisition costs, amortization period	2 years