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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, 2019
Dec. 31, 2018
Financial Instruments    
Equity investments at FVOCI $ 126.2 $ 155.9
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    
Financial Instruments    
Equity investments at FVOCI 126.2  
Foreign currency net working capital 132.8  
Recurring basis | Level 1    
Financial Instruments    
Equity investments at FVOCI 126.2  
Financial liabilities 126.2  
Recurring basis | Level 2    
Financial Instruments    
Financial liabilities 6.6  
Foreign currency forward and collar contracts | Recurring basis    
Financial Instruments    
Financial liabilities 3.9  
Foreign currency forward and collar contracts | Recurring basis | Level 2    
Financial Instruments    
Financial liabilities 3.9  
Energy Swap | Recurring basis    
Financial Instruments    
Financial liabilities 4.0  
Energy Swap | Recurring basis | Level 2    
Financial Instruments    
Financial liabilities 4.0  
Total return swap contract | Recurring basis    
Financial Instruments    
Foreign currency net working capital (1.3)  
Total return swap contract | Recurring basis | Level 2    
Financial Instruments    
Foreign currency net working capital $ (1.3)