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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2026
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 30, 2026, the Company’s Board of Directors authorized incremental share repurchases of up to an additional $600.0 million of Gartner’s common stock. This authorization is in addition to the previously authorized repurchases of up to $7.5 billion, which, as of the end of April 2026, had approximately $640.0 million remaining.