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SIGNIFICANT ACCOUNTING POLICIES - Significant Risks and Uncertainties (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
HKD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
HKD ($)
Currency risk        
Gradual increase in basis   1.00%    
pre-tax income $ 246.4 $ 31.6    
Gradual decrease in basis 1.00% 1.00%    
Pre-tax loss $ 246.4 $ 31.6    
China, Yuan Renminbi        
Currency risk        
Net liabilities   $ 2,374.8   $ 262.9
Estimated depreciation of Renminbi against the U.S. dollar (as a percent)   10.00%   10.00%
Appreciation in pre tax income $ 30.5   $ 3.4  
Estimated appreciation of Renminbi against the U.S. dollar (as a percent)   10.00%   10.00%
Depreciation in pre tax income   $ 30.5 $ 3.4