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Receivables and Contract Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Percentage of other receivables that are current 89.00%   89.00%    
Degree Program Segment deferred revenue          
Segment Reporting Information [Line Items]          
Contract with customer, liability, revenue recognized $ 0.1 $ 0.0 $ 1.4 $ 1.7  
Capitalized contract cost 0.5   0.5   $ 0.5
Alternative Credential Segment accounts receivable          
Segment Reporting Information [Line Items]          
Contract with customer, liability, revenue recognized $ 16.3 $ 16.0 $ 66.5 $ 71.9  
Minimum          
Segment Reporting Information [Line Items]          
Term of other receivables     12 months    
Maximum          
Segment Reporting Information [Line Items]          
Term of other receivables     42 months