STAFF COSTS (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Total staff costs
Staff costs	$ 11.8	$ 11.7	$ 23.4	$ 24.0	$ 46.2
Operating expenses
Total staff costs
Staff costs	2.0	2.2	4.0	4.6	9.3
Administrative expenses
Total staff costs
Staff costs	$ 9.8	$ 9.5	$ 19.4	$ 19.4	$ 36.9

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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