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Significant Accounting Policies - Property and Equipment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) uSHigherEducationCampus | Dec. 31, 2021 USD ($) uSHigherEducationCampus | Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss | $ 2.5 | $ 2.7 |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] | Restructuring costs |  |
Depreciation and amortization | $ 52.0 | $ 59.1 | $ 51.8
Number of long-lived assets sold | uSHigherEducationCampus | 1 | 2 |
Gain on sale of asset | $ 2.9 | $ 2.7 |
Capella Education Company And Torrens University and Related Assets in Australia and New Zealand (ANZ) | Computer Software And Content |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 3.2 | $ 7.2 | $ 6.9
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life of property and equipment | 40 years |  |

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