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Acquisition and Divestiture	12 Months Ended
Acquisition and Divestiture	Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Acquisition and Divestiture	Acquisition and Divestiture Acquisition Year Ended December 31, 2023 In September 2023, the Company acquired 100% of a formerly independent sales agent of Gartner Insights products in the Czech Republic for an aggregate purchase price of $7.9 million, including cash acquired and deferred consideration. During the year ended December 31, 2024, the Company paid $2.0 million of deferred consideration. Divestiture In February 2023, the Company completed the sale of a non-core business, TalentNeuron, for approximately $161.1 million after consideration of post-close adjustments. The Company recorded a pre-tax gain of $135.4 million on the sale of TalentNeuron, which is included in Gain from sale of divested operation in the Consolidated Statement of Operations for the year ended December 31, 2023. TalentNeuron was included in the Company’s Insights segment. Acquisition and Integration Charges The Company recognized $1.0 million and $9.6 million of Acquisition and integration charges during 2024 and 2023, respectively. Acquisition and integration charges reflect additional costs and expenses resulting from the Company’s acquisitions and divestitures and include, among other items, professional fees and personnel related expenses.