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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On February 6, 2018, the Company announced that it had reached a definitive agreement to sell its CEB Talent Assessment business to Exponent Private Equity, a UK-based private equity firm, for $400.0 million. The CEB Talent Assessment business is a significant portion of the Company's Talent Assessment & Other segment. The agreement comes at the end of a previously announced process to evaluate strategic alternatives for CEB Talent Assessment, formerly SHL, which was acquired by Gartner as part of the CEB acquisition in 2017. The transaction is expected to close in the first half of 2018 and is subject to customary closing conditions. Note 2 — Acquisitions and Divestiture provides additional information.