Segments - Holdings - Selected Financial Information by Reportable Operating Segment (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue		$ 540.7	$ 579.2
Less:
Adjusted EBITDA		36.4	70.7
Capital expenditures		22.1	23.5
Operating Segments
Segment Reporting Information [Line Items]
Revenues		542.9	581.3
Revenue		540.7	579.2
Less:
Film rentals and advertising	[1]	141.4	154.3
Concession supplies	[1]	44.3	44.0
Salaries and wages	[1]	90.3	86.9
Facility lease expense	[1]	78.3	77.3
Utilities and other	[1],[2]	105.7	100.4
General and Administrative Expense	[1]	54.5	48.9
Other segment items	[1],[3]	(10.2)	(3.3)
Adjusted EBITDA	[1],[4]	36.4	70.7
Eliminations
Segment Reporting Information [Line Items]
Revenue		(2.2)	(2.1)
US Reportable Segment [Member]
Less:
Capital expenditures		16.9	18.1
US Reportable Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues		419.3	459.1
Revenue		417.1	457.0
Less:
Film rentals and advertising	[1]	113.2	126.3
Concession supplies	[1]	33.8	34.3
Salaries and wages	[1]	74.6	72.5
Facility lease expense	[1]	60.2	60.5
Utilities and other	[1],[2]	81.8	78.3
General and Administrative Expense	[1]	43.7	39.1
Other segment items	[1],[3]	(10.2)	(3.1)
Adjusted EBITDA	[1],[4]	20.0	49.1
US Reportable Segment [Member] | Eliminations
Segment Reporting Information [Line Items]
Revenue		(2.2)	(2.1)
International Reportable Segment [Member]
Less:
Capital expenditures		5.2	5.4
International Reportable Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Revenues		123.6	122.2
Revenue		123.6	122.2
Less:
Film rentals and advertising	[1]	28.2	28.0
Concession supplies	[1]	10.5	9.7
Salaries and wages	[1]	15.7	14.4
Facility lease expense	[1]	18.1	16.8
Utilities and other	[1],[2]	23.9	22.1
General and Administrative Expense	[1]	10.8	9.8
Other segment items	[1],[3]		(0.2)
Adjusted EBITDA	[1],[4]	16.4	21.6
International Reportable Segment [Member] | Eliminations
Less:
Utilities and other		$ 2.2	$ 2.1

[1] The significant expense categories and amounts presented align with the segment-level information that is regularly provided to the CODM.

[2] Utilities and other for the International reportable segment is shown net of intersegment expenses of $2.2 and $2.1 for the three months ended March 31, 2025 and 2024, respectively.

[3] 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).

[4] See the table below for a reconciliation of net (loss) income to Adjusted EBITDA.