Consolidated Statements of Equity $ in Millions		USD ($) shares		Previously Reported USD ($)	Revision of Prior Period, Adjustment USD ($)	[1]	Total NIQ Shareholders’ Equity USD ($)		Total NIQ Shareholders’ Equity Previously Reported USD ($)	Total NIQ Shareholders’ Equity Revision of Prior Period, Adjustment USD ($)	[1]	Ordinary Shares USD ($) shares		Ordinary Shares Previously Reported USD ($) shares	Ordinary Shares Revision of Prior Period, Adjustment shares	[1]	Preferred Shares USD ($) shares		Preferred Shares Previously Reported USD ($) shares	Euro Deferred Shares USD ($) shares	Paid-In Capital USD ($)		Paid-In Capital Previously Reported USD ($)	Paid-In Capital Revision of Prior Period, Adjustment USD ($)	[1]	Accumulated Deficit USD ($)		Accumulated Deficit Previously Reported USD ($)	Accumulated Deficit Revision of Prior Period, Adjustment USD ($)	[1]	Accumulated Other Comprehensive (Loss) Income USD ($)		Noncontrolling Interests USD ($)		Noncontrolling Interests Previously Reported USD ($)
Beginning balance (in shares) at Dec. 31, 2022 | shares												245,000,000	[1]	100	244,999,900					0
Beginning balance (in shares) at Dec. 31, 2022 | shares																	0	[1]	0
Beginning balance at Dec. 31, 2022		$ 527.3	[1]	$ 541.8	$ (14.5)		$ 525.8	[1]	$ 540.3	$ (14.5)		$ 0.0	[1]	$ 0.0			$ 0.0	[1]	$ 0.0	$ 0.0	$ 924.0	[1]	$ 951.4	$ (27.4)		$ (473.3)	[1]	$ (486.2)	$ 12.9		$ 75.1	[1]	$ 1.5	[1]	$ 1.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(573.6)					(577.4)																			(577.4)							3.8
Other comprehensive (loss) income		5.6					5.6																								5.6
Contribution from Parent	[2]	1,011.3					1,011.3														1,011.3
Shared-based compensation		4.3					4.3														4.3
Acquisition of subsidiaries		253.0																															253.0
Cash dividends paid to noncontrolling interests		(11.1)																															(11.1)
Ending balance (in shares) at Dec. 31, 2023 | shares												245,000,000								0
Ending balance (in shares) at Dec. 31, 2023 | shares																	0
Ending balance at Dec. 31, 2023		1,216.8					969.6					$ 0.0					$ 0.0			$ 0.0	1,939.6					(1,050.7)					80.7		247.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Offering expenses		$ 0.0
Effective share split		0.0000004081632653
Net (loss) income		$ (791.7)					(798.0)																			(798.0)							6.3
Other comprehensive (loss) income		(118.4)					(118.4)																								(118.4)
Contribution from Parent	[2]	1.8					1.8														1.8
Shared-based compensation		4.7					4.7														4.7
Cash dividends paid to noncontrolling interests		$ (14.6)																															(14.6)
Ending balance (in shares) at Dec. 31, 2024 | shares		245,000,000										245,000,000								0
Ending balance (in shares) at Dec. 31, 2024 | shares		0															0
Ending balance at Dec. 31, 2024		$ 298.6					59.7					$ 0.0					$ 0.0			$ 0.0	1,946.1					(1,848.7)					(37.7)		238.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Offering expenses		0.0
Net (loss) income		(345.3)					(353.3)																			(353.3)							8.0
Other comprehensive (loss) income		5.7					5.7																								5.7
Issuance of share capital in connection with IPO net of underwriting discounts, commissions and offering expenses (in shares) | shares	[3],[4]											50,000,000								25,000
Issuance of share capital in connection with IPO net of underwriting discounts and commissions and offering expenses	[3],[4]	984.1					984.1														984.1
Shared-based compensation		43.0					43.0														43.0
Reclassification of warrant to equity		231.1					231.1														231.1
Reclassification of phantom to equity		18.1					18.1														18.1
Cash dividends paid to noncontrolling interests		$ (9.7)																															(9.7)
Ending balance (in shares) at Dec. 31, 2025 | shares		295,000,000										295,000,000								25,000
Ending balance (in shares) at Dec. 31, 2025 | shares		0															0
Ending balance at Dec. 31, 2025		$ 1,225.6					$ 988.4					$ 0.0					$ 0.0			$ 0.0	$ 3,222.4					$ (2,202.0)					$ (32.0)		$ 237.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Offering expenses		$ 21.7
Beginning balance (in shares) at Jul. 21, 2025 | shares		100
Ending balance (in shares) at Jul. 22, 2025 | shares		245,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effective share split		0.0000004081632653

[1] Prior to the common control transaction, the Company had 100 ordinary shares outstanding. Following the common control transaction, the Company will have 245,000,000 ordinary shares outstanding, resulting in an effective share split of 1:2,450,000. See Note 2. “Summary of Significant Accounting Policies” for discussion around the Company’s common control transaction and updated basis of presentation.

[2] Contribution from Parent was a non-cash contribution mainly related to equity consideration transferred as part of the transaction to combine with GfK SE, as described in Note 3. “Acquisitions”.

[3] Represents aggregate net proceeds of $985.1 million after deducting underwriting discounts and commissions and estimated offering expenses at the initial public offering date less additional offering expense and other adjustments of $1.0 million recognized subsequent to the initial public offering date.

[4] The Euro deferred shares were issued in order to satisfy statutory capitalization requirements for all Irish public limited companies. The Euro deferred shares are non-voting shares and do not have any right to receive a dividend.