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Revenue from Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Percentage of Refundable Amounts Included Within Contract Liabilities	18.00%		18.00%		19.00%
Deferred Revenue Recognized in Period Related to Beginning Balance			$ 329.8
Deferred Revenue Recognized of Refundable Prepaid Amounts			$ 49.3
U.S. [Member]
Disaggregation of Revenue [Line Items]
Percentage of Revenue	79.00%	80.00%	78.00%	78.00%
Non-US [Member]
Disaggregation of Revenue [Line Items]
Percentage of Revenue	21.00%	20.00%	22.00%	22.00%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Percentage of Revenue	51.00%	54.00%	53.00%	54.00%
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Percentage of Revenue	49.00%	46.00%	47.00%	46.00%
Kaplan International [Member]
Disaggregation of Revenue [Line Items]
Contract Asset, Total					$ 36.6
Contract Asset, Noncurrent	$ 31.2		$ 31.2		34.7
Contract Asset, Current					1.9
Additional Contract Assets
Disaggregation of Revenue [Line Items]
Contract Asset, Current	$ 3.0		$ 3.0		$ 3.1
Long-term Contract with Customer [Member] | Supplemental Education [Member]
Disaggregation of Revenue [Line Items]
Minimum Term of Contract			12 months
Revenue Remaining Performance Obligation Percentage of Revenue Expected to be Recognized Over Next 12 Months	65.00%		65.00%

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