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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, 2020
Dec. 31, 2019
Financial Instruments    
Equity investments at FVOCI $ 113.0 $ 126.2
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 113.0  
Foreign currency net working capital 105.3  
Recurring basis | Level 1    
Financial Instruments    
Equity investments at FVOCI 113.0  
Financial liabilities 113.0  
Recurring basis | Level 2    
Financial Instruments    
Financial liabilities (7.7)  
Foreign currency forward and collar contracts | Recurring basis    
Financial Instruments    
Financial liabilities (4.3)  
Foreign currency forward and collar contracts | Recurring basis | Level 2    
Financial Instruments    
Financial liabilities (4.3)  
Energy Swap | Recurring basis    
Financial Instruments    
Financial liabilities 7.6  
Energy Swap | Recurring basis | Level 2    
Financial Instruments    
Financial liabilities 7.6  
Total return swap contract | Recurring basis    
Financial Instruments    
Foreign currency net working capital (11.0)  
Total return swap contract | Recurring basis | Level 2    
Financial Instruments    
Foreign currency net working capital $ (11.0)