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ACCOUNTING POLICIES (Details Textual) - 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
Accounting Policies [Line Items]          
Administrative expenses $ 12.3 $ 12.1 $ 24.7 $ 24.3 $ 47.8
Right-of-use assets         11.4
Lease liabilities         11.4
Undrawn facilities 367.0   367.0    
Net debt $ 623.0   $ 623.0    
Percentages of net debt loan to value ratio     51.00%    
Alternative Performance Measure (APM) "EBITDA"          
Accounting Policies [Line Items]          
Administrative expenses         2.8
Depreciation | Alternative Performance Measure (APM) "EBITDA"          
Accounting Policies [Line Items]          
Administrative expenses         2.5
Financial expenses | Alternative Performance Measure (APM) "EBITDA"          
Accounting Policies [Line Items]          
Administrative expenses         $ 0.3