Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Sep. 01, 2021	Aug. 10, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 112,593,000			$ 112,593,000		$ 243,486,000
Amortization	4,000,000			11,900,000
Impairment of goodwill and intangible assets				131,400,000
Impairment				13,500,000
Impairment of goodwill and intangible assets	0		$ 0	144,900,000	$ 0
Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired							$ 24,500,000
Impairment				13,500,000
Rasmussen
Business Acquisition [Line Items]
Goodwill	217,400,000			217,400,000			$ 217,430,000
Identified intangible assets with finite useful life	35,500,000			35,500,000
HCN Segment
Business Acquisition [Line Items]
Goodwill	26,600,000			26,600,000					$ 38,600,000
Indefinite-lived intangible assets acquired	51,000,000		$ 3,700,000	51,000,000	$ 3,700,000
Identified intangible assets with finite useful life	4,400,000			4,400,000
Graduate School USA
Business Acquisition [Line Items]
Goodwill								$ 0
Identified intangible assets with finite useful life	$ 1,000,000			$ 1,000,000
RU Segment
Business Acquisition [Line Items]
Impairment of goodwill and intangible assets		$ 131,400,000
Impairment of goodwill and intangible assets		144,900,000
Goodwill, impairment loss, tax effect		36,000,000
RU Segment | Accreditation, licensing, and Title IV
Business Acquisition [Line Items]
Fair value of intangible assets		11,000,000
Impairment		$ 13,500,000