INVESTMENTS IN AFFILIATES - Summary of Activity for Each of Company's Other Investments (Detail) - Other Affiliates - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		$ 23.6	$ 22.6	$ 25.2
Equity in (loss) income of affiliates		11.9	6.8	4.6
Cash distributions received		(9.3)	(5.7)	(6.9)
Other	[1]		(0.1)	(0.3)
Investments, ending balance		26.2	23.6	22.6
AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		3.4	4.2	3.7
Equity in (loss) income of affiliates		10.0	4.9	3.4
Cash distributions received		(9.3)	(5.7)	(2.9)
Other	[1]		0.0	0.0
Investments, ending balance		4.1	3.4	4.2
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		2.1	1.8	1.8
Equity in (loss) income of affiliates		0.5	0.3	0.0
Cash distributions received		0.0	0.0	0.0
Other	[1]		0.0	0.0
Investments, ending balance		2.6	2.1	1.8
FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		18.1	16.5	19.3
Equity in (loss) income of affiliates		1.4	1.6	1.2
Cash distributions received		0.0	0.0	(4.0)
Other	[1]		0.0	0.0
Investments, ending balance		19.5	18.1	16.5
Other Investments
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	[1]	0.0	0.1	0.4
Equity in (loss) income of affiliates	[1]	0.0	0.0	0.0
Cash distributions received	[1]	0.0	0.0	0.0
Other	[1]		(0.1)	(0.3)
Investments, ending balance	[1]	$ 0.0	$ 0.0	$ 0.1

[1] Consists primarily of mark-to-market adjustment on an investment in marketable securities.