INVESTMENTS IN AFFILIATES - Summary of Activity for Each of Company's Other Investments (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		$ 22.6	$ 25.2	$ 23.8
Equity in income of affiliates		6.8	4.6	1.5
Cash distributions received		(5.7)	(6.9)
Other	[1]	(0.1)	(0.3)	(0.1)
Investments, ending balance		23.6	22.6	25.2
AC JV, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Cash distributions received		(5.7)	(2.9)
AC JV, LLC [Member] | Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		4.2	3.7	3.7
Equity in income of affiliates		4.9	3.4	0.0
Cash distributions received		(5.7)	(2.9)
Other	[1]	0.0	0.0	0.0
Investments, ending balance		3.4	4.2	3.7
Digital Cinema Distribution Coalition | Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		1.8	1.8	1.3
Equity in income of affiliates		0.3	0.0	0.5
Cash distributions received		0.0	0.0
Other	[1]	0.0	0.0	0.0
Investments, ending balance		2.1	1.8	1.8
FE Concepts, LLC | Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance		16.5	19.3	18.3
Equity in income of affiliates		1.6	1.2	1.0
Cash distributions received		0.0	(4.0)
Other	[1]	0.0	0.0	0.0
Investments, ending balance		18.1	16.5	19.3
Other Investments | Other Affiliates
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	[1]	0.1	0.4	0.5
Equity in income of affiliates	[1]	0.0	0.0	0.0
Cash distributions received	[1]	0.0	0.0
Other	[1]	(0.1)	(0.3)	(0.1)
Investments, ending balance	[1]	$ 0.0	$ 0.1	$ 0.4

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