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LEASING - Maturity analysis (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [line items]      
Total undiscounted lease liabilities $ 35.2   $ 30.8
Lease liabilities included under "Borrowings" 30.6 $ 35.2 25.3
Non-current 10.2   3.2
Current 20.4   22.1
2020      
Disclosure of maturity analysis of operating lease payments [line items]      
Total undiscounted lease liabilities 7.5   5.2
Between 1 and 5 years      
Disclosure of maturity analysis of operating lease payments [line items]      
Total undiscounted lease liabilities 27.6   $ 25.6
More than 5 years      
Disclosure of maturity analysis of operating lease payments [line items]      
Total undiscounted lease liabilities $ 0.1