Other Investments- Summary of Activity for Each of Company's Other Investments (Detail) - Other Affiliates $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	$ 22.6
Equity in loss	1.1
Investments, ending balance	23.7
AC JV, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	4.2
Equity in loss	0.8
Investments, ending balance	5.0
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	1.8
Equity in loss	0.0
Investments, ending balance	1.8
FE Concepts, LLC
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	16.5
Equity in loss	0.3
Investments, ending balance	16.8
Other Investments
Schedule Of Equity Method Investments [Line Items]
Investments, beginning balance	0.1
Equity in loss	0.0
Investments, ending balance	$ 0.1