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OPERATING LEASES (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Operating leases [Line Items]    
Non-cancellable operating lease rentals $ 1.5 $ 10.2
Less than 1 year    
Operating leases [Line Items]    
Non-cancellable operating lease rentals 1.0 2.0
Between 1 and 5 years    
Operating leases [Line Items]    
Non-cancellable operating lease rentals 0.5 5.0
More than 5 years    
Operating leases [Line Items]    
Non-cancellable operating lease rentals $ 0.0 $ 3.2