Segments - Holdings - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Add (deduct):
Interest expense	[1]	$ (34.6)		$ (37.1)		$ (72.3)	$ (73.9)
Other loss (income), net	[2]	0.1		(12.1)		(17.6)	(14.0)
Depreciation and amortization		49.8		52.8		99.2	107.7
Impairment of long-lived and other assets		0.0		9.4		0.0	10.1
Loss (gain) on disposal of assets and other		1.7		(3.0)		2.1	(2.7)
Loss on debt amendments and extinguishments		2.5		10.7		2.5	10.7
Non-cash rent expense		(3.2)		(4.5)		(7.6)	(8.4)
Share based awards compensation expense		9.3		6.8		15.7	12.5
Adjusted EBITDA		142.1		231.5		212.8	317.7
CNK
Segment Reporting Information [Line Items]
Net income		46.6	$ 25.3	120.4	$ (2.5)	71.9	117.9
Add (deduct):
Income tax (benefit) expense		(0.9)		12.3		(28.6)	8.4
Interest expense		(34.6)		(37.1)		(72.3)	(73.9)
Cash distributions from equity investees						2.9	1.6
Depreciation and amortization		49.8		52.8		99.2	107.7
Impairment of long-lived and other assets		0.0		9.4		0.0	10.1
Loss on debt amendments and extinguishments		2.5		10.7		2.5	10.7
Non-cash rent expense						(7.6)	(8.4)
Share based awards compensation expense						15.7	12.5
Other Cash Distributions From Equity Investees [Member]
Add (deduct):
Cash distributions from equity investees	[3]	$ 1.6		$ 1.6		$ 2.9	$ 1.6

[1] Includes amortization of debt issuance costs, amortization of original issue discount, and amortization of accumulated gains for amended swap agreements.

[2] Includes interest income, foreign currency exchange and other related loss, interest expense - NCM, equity in income (loss) of affiliates and net gain (loss) on investment in NCMI.

[3] Reflects cash distributions received from equity investees that were recorded as a reduction of the respective investment balances. These distributions are reported entirely within the U.S. operating segment.