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Significant Accounting Policies - Property and Equipment (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) uSHigherEducationCampus | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Impairment loss | $ 2.7 |  |
Depreciation and amortization | $ 59.1 | $ 51.8 | $ 49.5
Number of long-lived assets marketed for sale | uSHigherEducationCampus | 2 |  |
Gain on sale of asset | $ 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 | $ 7.2 | $ 6.9 | $ 6.3
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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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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