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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, 2018
Dec. 31, 2017
Financial Instruments    
Equity investments at FVOCI $ 155.9 $ 188.0
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 155.9  
Financial assets 128.7  
Recurring basis | Level 1    
Financial Instruments    
Equity investments at FVOCI 155.9  
Financial assets 155.9  
Recurring basis | Level 2    
Financial Instruments    
Financial assets (27.2)  
Recurring basis | TRS    
Financial Instruments    
Financial assets 3.2  
Recurring basis | TRS | Level 2    
Financial Instruments    
Financial assets 3.2  
Foreign currency forward and collar contracts | Recurring basis    
Financial Instruments    
Financial assets (21.8)  
Foreign currency forward and collar contracts | Recurring basis | Level 2    
Financial Instruments    
Financial assets (21.8)  
Energy swap contracts | Recurring basis    
Financial Instruments    
Financial assets (8.6)  
Energy swap contracts | Recurring basis | Level 2    
Financial Instruments    
Financial assets $ (8.6)