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FAIR VALUE MEASUREMENT - Assets (liabilities) measured at fair value on recurring basis (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
FAIR VALUE MEASUREMENT    
Equity investments at FVOCI $ 54.7 $ 116.9
Assets transfer out of Level 1 into Level 2 0.0  
Assets transfer out of Level 2 into Level 1 0.0  
Liabilities transfer out of Level 1 into Level 2 0.0  
Liabilities transfer out of Level 2 into Level 1 0.0  
Assets transfers into Level 3 fair value measurements 0.0  
Assets transfers out of Level 3 fair value measurements 0.0  
Liabilities transfers into Level 3 fair value measurements 0.0  
Liabilities transfers out of Level 3 fair value measurements 0.0  
Recurring basis    
FAIR VALUE MEASUREMENT    
Equity investments at FVOCI 54.7  
Financial assets 70.0  
Recurring basis | Foreign currency forward and collar contracts    
FAIR VALUE MEASUREMENT    
Financial assets 7.4  
Recurring basis | Energy swap contracts    
FAIR VALUE MEASUREMENT    
Financial assets 1.0  
Recurring basis | Other    
FAIR VALUE MEASUREMENT    
Financial assets 6.9  
Recurring basis | Level 1    
FAIR VALUE MEASUREMENT    
Equity investments at FVOCI 54.7  
Financial assets 54.7  
Recurring basis | Level 2    
FAIR VALUE MEASUREMENT    
Financial assets 15.3  
Recurring basis | Level 2 | Foreign currency forward and collar contracts    
FAIR VALUE MEASUREMENT    
Financial assets 7.4  
Recurring basis | Level 2 | Energy swap contracts    
FAIR VALUE MEASUREMENT    
Financial assets 1.0  
Recurring basis | Level 2 | Other    
FAIR VALUE MEASUREMENT    
Financial assets $ 6.9