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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, 2021
Dec. 31, 2020
Financial Instruments    
Equity investments at FVOCI $ 98.2 $ 113.0
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    
Financial Instruments    
Equity investments at FVOCI 98.2  
Foreign currency net working capital 135.8  
Recurring basis | Foreign currency forward and collar contracts    
Financial Instruments    
Financial liabilities (4.5)  
Recurring basis | Energy swap contracts    
Financial Instruments    
Financial liabilities 40.4  
Recurring basis | Level 1    
Financial Instruments    
Equity investments at FVOCI 98.2  
Recurring basis | Level 2    
Financial Instruments    
Financial liabilities 37.6  
Recurring basis | Level 2 | Foreign currency forward and collar contracts    
Financial Instruments    
Financial liabilities (4.5)  
Recurring basis | Level 2 | Energy swap contracts    
Financial Instruments    
Financial liabilities 40.4  
TRS | Recurring basis    
Financial Instruments    
Foreign currency net working capital 1.7  
TRS | Recurring basis | Level 2    
Financial Instruments    
Foreign currency net working capital $ 1.7