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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Other Expense (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Expense (Income):      
Derivative liability fair value adjustment for embedded conversion feature in the Convertible Notes $ 0.0 $ 89.4 $ (23.5)
Derivative asset fair value adjustment for contingent call option related to the Class B common stock purchase and cancellation agreement 0.0 19.6 17.7
(Gain) loss on extinguishment of debt 14.1 (93.6) 16.6
Total other expense (income) (87.9) 28.9 13.4
Other expense (income)      
Other Expense (Income):      
Derivative liability fair value adjustment for embedded conversion feature in the Convertible Notes   89.4 (23.5)
Derivative asset fair value adjustment for contingent call option related to the Class B common stock purchase and cancellation agreement   19.6 17.7
Credit losses (income) related to contingent lease guarantees (5.7) 15.0  
Governmental assistance due to COVID-19- International markets (81.5) (38.6)  
Governmental assistance due to COVID-19 - Domestic markets (5.6)    
Foreign currency transaction (gains) losses (9.8) (2.8) 1.5
Non-operating components of net periodic benefit cost (income) (0.7) 1.1 1.2
(Gain) loss on extinguishment of debt 14.4   16.6
Financing fees related to modification of debt agreements 1.0 39.3  
Loss on Pound sterling forward contract     0.9
Business interruption insurance recoveries   (0.5) (1.1)
Other     0.1
Total other expense (income) $ (87.9) 28.9 $ 13.4
Second Lien Notes due 2026 | Other expense (income)      
Other Expense (Income):      
(Gain) loss on extinguishment of debt   $ (93.6)