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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Other Expense (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Expense (Income):      
(Gain) loss on extinguishment of debt $ (142.8) $ 92.8 $ 14.1
Business interruption insurance recoveries $ (1.3) $ (0.3)  
Gain on Business Interruption Insurance Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] Total other expense (income) Total other expense (income) Total other expense (income)
Total other expense (income) $ (69.1) $ 53.6 $ (87.9)
Odeon Term Loan Facility      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   36.5  
Other expense      
Other Expense (Income):      
Decreases related to contingent lease guarantees   (0.2) (5.7)
Governmental assistance due to COVID-19- International markets (3.8) (23.0) (81.5)
Governmental assistance due to COVID-19 - U.S. markets (1.0) (2.8) (5.6)
Foreign currency transaction (gains) losses (17.8) (12.3) (9.8)
Non-operating components of net periodic benefit cost (income) 1.4 (0.6) (0.7)
Derivative stockholder settlement (14.0)    
Shareholder litigation contingency 110.2    
Financing fees related to modification of debt agreements     1.0
Other expense | 6.125% Senior Subordinated Notes due 2027      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   (3.7)  
Other expense | 5.875% Senior Subordinated Notes due 2026      
Other Expense (Income):      
(Gain) loss on extinguishment of debt (2.3)    
Other expense | Second Lien Notes due 2026      
Other Expense (Income):      
(Gain) loss on extinguishment of debt $ (140.5) (75.0)  
Other expense | First Lien Toggle Notes due 2026.      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   32.9 $ 14.4
Other expense | First Lien Notes due 2025      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   47.7  
Other expense | First Lien Notes due 2026      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   $ 54.4