Quarterly report pursuant to Section 13 or 15(d)

Other Investments- Summary of Activity for Each of Company's Other Investments (Detail)

v3.22.2.2
Other Investments- Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance $ 25.2  
Cash distributions received (1.5) $ (0.2)
Equity income (7.5) $ (22.1)
Investments, ending balance 26.3  
AC JV, LLC    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 3.7  
Cash distributions received (1.5)  
Equity income 1.6  
Other 0.0  
Investments, ending balance 3.8  
Digital Cinema Distribution Coalition    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 25.2  
Cash distributions received (1.5)  
Equity income 2.8  
Other (0.2)  
Investments, ending balance 26.3  
Other Affiliates | Digital Cinema Distribution Coalition    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 1.8  
Cash distributions received 0.0  
Equity income 0.1  
Other 0.0  
Investments, ending balance 1.9  
Other Affiliates | FE Concepts, LLC    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 19.3  
Cash distributions received 0.0  
Equity income 1.1  
Other 0.0  
Investments, ending balance 20.4  
Other Affiliates | Other Investments    
Schedule Of Equity Method Investments [Line Items]    
Investments, beginning balance 0.4  
Cash distributions received 0.0  
Equity income 0.0  
Other (0.2)  
Investments, ending balance $ 0.2