IMPAIRMENT OF LONG-LIVED AND OTHER ASSETS - Summary of Long-Lived Asset Impairment Losses (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Impaired Long Lived Assets Held And Used [Line Items]
Total impairment		$ 1.5	$ 16.6	$ 174.1
Investment In Ncm [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Total impairment	[1],[2]		0.7	113.2
Us Operating Segment [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Theatre properties		0.0	6.6	19.7
Theatre operating lease right-of-use assets		0.0	7.1	34.0
Investment in NCM	[3]	0.0	0.7	113.2
Other		0.0	0.0	3.9
Total impairment		0.0	14.4	170.8
International Operating Segment [Member]
Impaired Long Lived Assets Held And Used [Line Items]
Theatre properties		0.9	0.7	2.2
Theatre operating lease right-of-use assets		0.6	1.5	1.1
Total impairment		$ 1.5	$ 2.2	$ 3.3

[1] Reflected in impairment of long-lived and other assets on the consolidated income statement for the year indicated. See further discussion at Investment in National CineMedia below.

[2] See Investment in National CineMedia below.

[3] See discussion at Investment in National CineMedia in Note 8.