Investments in Affiliates - Summary of Activity for Each of Company's Investments in affiliates (Detail) - Other Affiliates [Member] $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	$ 26.2
Cash distributions received	(4.8)
Equity income	0.9
Investments, ending balance	22.3
AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	4.1
Cash distributions received	(0.8)
Equity income	0.9
Investments, ending balance	4.2
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	2.6
Cash distributions received	0.0
Equity income	(0.2)
Investments, ending balance	2.4
FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	19.5
Cash distributions received	(4.0)
Equity income	0.2
Investments, ending balance	$ 15.7