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LEASES - Lease liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments $ 35.4  
Carrying value of lease liabilities 32.6  
Less: current portion of lease liabilities (8.7)  
Non-current portion of lease liabilities 23.9 $ 8.9
2020    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments 9.8  
Between 1 and 3 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments 17.0  
Between 3 and 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments 8.6  
More than 5 years    
Disclosure of maturity analysis of operating lease payments [line items]    
Total undiscounted lease payments $ 0.0