Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ (88.7)	$ (117.9)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(13.1)	(2.3)
Cash flow hedges	19.9	(8.9)
Total other comprehensive income (loss)	6.8	(11.2)
Total other comprehensive loss	(81.9)	(129.1)
Less: Comprehensive (loss) income attributable to noncontrolling interests	(1.4)	1.9
Total other comprehensive loss attributable to NIQ	$ (80.5)	$ (131.0)