Segments - Holdings - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Add (deduct):
Interest expense	[1]	$ 37.7	$ 36.8
Other (income) expense, net	[2]	(17.7)	(1.9)
Depreciation and amortization		49.4	54.9
Impairment of long-lived and other assets		0.0	0.7
Gain on disposal of assets and other		0.4	0.3
Non-cash rent expense		(4.4)	(3.9)
Share based awards compensation expense		6.4	5.7
Adjusted EBITDA		70.7	86.2
CNK
Segment Reporting Information [Line Items]
Net income (loss)		25.3	(2.5)
Add (deduct):
Income tax benefit		(27.7)	(3.9)
Interest expense		37.7	36.8
Cash distributions from equity investees		1.3	0.0
Depreciation and amortization		49.4	54.9
Impairment of long-lived and other assets		0.0	0.7
Non-cash rent expense		(4.4)	(3.9)
Share based awards compensation expense		6.4	5.7
Other Cash Distributions From Equity Investees [Member]
Add (deduct):
Cash distributions from equity investees	[3]	$ 1.3	$ 0.0

[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 gain (loss), interest expense - NCM, equity in income (loss) of affiliates and unrealized gain 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.