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DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of offsetting (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial assets    
Gross amount $ 0.7 $ 7.1
Offsetting amount (0.2) (3.4)
Net amount presented in the statement of financial position 0.5 3.7
Financial liabilities    
Gross amount 12.5 6.8
Offsetting amount (0.2) (3.4)
Net amount presented in the statement of financial position $ (12.3) $ (3.4)