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OTHER INVESTMENTS - Summary of Activity for Each of Company's Other Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance $ 25.2 $ 23.8 $ 155.3
Cash contributions     0.1
Equity in income (loss) 4.6 1.5 (28.1)
Cash distributions from DCIP (6.9)   (11.3)
Non-cash distribution received [1]     (89.8)
Other (0.3) [2] (0.1) [2] (2.4) [3]
Investments, ending balance 22.6 25.2 23.8
Other Investments | Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance [2] 0.4 0.5 2.9
Other [2] (0.3) (0.1) (2.4) [3]
Investments, ending balance [2] 0.1 0.4 0.5
Digital Cinema Distribution Coalition | Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 1.8 1.3 3.2
Equity in income (loss)   0.5 (1.0)
Cash distributions from DCIP     (0.9)
Investments, ending balance 1.8 1.8 1.3
AC JV, LLC      
Schedule Of Equity Method Investments [Line Items]      
Cash distributions from DCIP (2.9)    
AC JV, LLC | Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 3.7 3.7 5.0
Equity in income (loss) 3.4   (1.3)
Cash distributions from DCIP (2.9)    
Investments, ending balance 4.2 3.7 3.7
Digital Cinema Implementation Partners      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 0.0    
Cash distributions from DCIP [4] (3.7) (13.1) (10.4)
Non-cash distribution received [5]     12.9
Other     12.9
Investments, ending balance 0.0 0.0  
Digital Cinema Implementation Partners | Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance     124.7
Cash contributions     0.1
Equity in income (loss)     (24.6)
Cash distributions from DCIP     (10.4)
Non-cash distribution received [1]     (89.8)
FE Concepts, LLC | Other Affiliates      
Schedule Of Equity Method Investments [Line Items]      
Investments, beginning balance 19.3 18.3 19.5
Equity in income (loss) 1.2 1.0 (1.2)
Cash distributions from DCIP (4.0)    
Investments, ending balance $ 16.5 $ 19.3 $ 18.3
[1] Consists of projectors distributed to the Company from DCIP as discussed below.
[2] Consists primarily of mark-to-market adjustment on an investment in marketable securities.
[3] Consists primarily of the impairment of a cost method investment in the year ended December 31, 2020 and mark-to-market adjustment on an investment in marketable securities.
[4] Recorded as a reduction in the Company's investment in DCIP for the year ended December 31, 2020. Recorded in cash distributions from DCIP on the consolidated statements of loss of Holdings and CUSA for the years ended December 31, 2021 and 2022. See discussion at Distribution of Projectors from DCIP above.
[5] Recorded as non-cash distributions from DCIP on each of Holdings’ and CUSA’s consolidated statements loss. See discussion at Distribution of Projectors from DCIP above.