Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Related party transaction, tax sharing payments, fair value	$ 70.0	$ 71.5

Related Party, Tax Sharing Agreement, Distribution Liability

No definition available.

Name:	xm_RelatedPartyTaxSharingAgreementDistributionLiability
Namespace Prefix:	xm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration