Segments - Holdings - Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue		$ 940.5	$ 734.2	$ 1,481.2	$ 1,313.4
Less:
Adjusted EBITDA		232.2	142.1	268.6	212.8
Capital expenditures		30.1	23.7	52.2	47.2
Operating Segments
Segment Reporting Information [Line Items]
Revenues		944.1	737.3	1,487.0	1,318.6
Revenue		940.5	734.2	1,481.2	1,313.4
Less:
Film rentals and advertising		270.8	204.0	412.2	358.3
Concession supplies		73.1	56.6	117.4	100.6
Salaries and wages		109.4	97.3	199.7	184.2
Facility lease expense		82.9	81.5	161.2	158.8
Utilities and other	[1]	124.7	104.7	230.4	205.1
General and administrative		54.1	55.7	108.6	104.6
Other segment items	[2]	(6.7)	(7.7)	(16.9)	(11.0)
Adjusted EBITDA	[3]	232.2	142.1	268.6	212.8
Eliminations
Segment Reporting Information [Line Items]
Revenue		(3.6)	(3.1)	(5.8)	(5.2)
US Reportable Segment
Segment Reporting Information [Line Items]
Revenue	[4]	759.3	572.0	1,176.4	1,029.0
Less:
Capital expenditures		25.0	16.1	41.9	34.2
US Reportable Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues		762.9	575.1	1,182.2	1,034.2
Revenue		759.3	572.0	1,176.4	1,029.0
Less:
Film rentals and advertising		227.7	164.6	340.9	290.9
Concession supplies		57.0	43.2	90.8	77.5
Salaries and wages		90.9	80.8	165.5	153.3
Facility lease expense		62.2	60.0	122.4	120.5
Utilities and other	[1]	97.7	80.1	179.5	158.4
General and administrative		42.4	41.8	86.1	80.9
Other segment items	[2]	(6.7)	(7.3)	(16.9)	(10.4)
Adjusted EBITDA	[3]	188.1	108.8	208.1	157.9
US Reportable Segment | Eliminations
Segment Reporting Information [Line Items]
Revenue		(3.6)	(3.1)	(5.8)	(5.2)
International Reportable Segment
Segment Reporting Information [Line Items]
Revenue		181.2	162.2	304.8	284.4
Less:
Capital expenditures		5.1	7.6	10.3	13.0
International Reportable Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenues		181.2	162.2	304.8	284.4
Revenue		181.2	162.2	304.8	284.4
Less:
Film rentals and advertising		43.1	39.4	71.3	67.4
Concession supplies		16.1	13.4	26.6	23.1
Salaries and wages		18.5	16.5	34.2	30.9
Facility lease expense		20.7	21.5	38.8	38.3
Utilities and other	[1]	27.0	24.6	50.9	46.7
General and administrative		11.7	13.9	22.5	23.7
Other segment items	[2]		(0.4)		(0.6)
Adjusted EBITDA	[3]	44.1	33.3	60.5	54.9
International Reportable Segment | Eliminations
Less:
Utilities and other		$ 3.6	$ 3.1	$ 5.8	$ 5.2

[1] Utilities and other for the International reportable segment is shown net of intersegment expenses $3.6 and $3.1 for the three months ended June 30, 2025 and 2024, respectively. Utilities and other for the International reportable segment is shown net of intersegment expenses of $5.8 and $5.2 for the six months ended June 30, 2025 and 2024, respectively.

[2] Other segment items for each reportable segment includes non-cash rent, share-based compensation expense and cash distributions from equity investees (reported entirely within the U.S. reportable segment).

[3] See the table below for a reconciliation of net income to Adjusted EBITDA.

[4] U.S. segment revenue excludes intercompany transactions with the international reportable segment. See Note 15 for the amount of intercompany eliminations for the periods presented.