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Segment Reporting - Financials (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Segment Reporting    
Number of operating segments | item 2  
Revenue $ 653.2 $ 675.0
Income/(expenses)    
Costs of sales 118.2 142.0
Depletion and depreciation 247.7 273.0
Gross profit 287.3 260.0
Other operating (income)/expenses    
General and administrative expenses 22.6 24.9
Impairment loss recognized 76.0  
Gain on sale of gold bullion (0.1) (0.3)
Foreign exchange (gain) and other income (expense) (1.8) (1.1)
Realized gain on investments   (2.0)
Impairment of investment   4.5
Income before finance items and income taxes 190.6 234.0
Finance items    
Finance income 3.1 5.4
Finance expenses (4.6) (3.4)
Net income before income taxes 189.1 236.0
Operating Segments    
Segment Reporting    
Revenue 653.2 675.0
Income/(expenses)    
Costs of sales 118.2 142.0
Depletion and depreciation 243.9 268.9
Gross profit 291.1 264.1
Other operating (income)/expenses    
General and administrative expenses 22.6 24.9
Impairment loss recognized 76.0  
Gain on sale of gold bullion (0.1) (0.3)
Depreciation 3.8 4.1
Foreign exchange (gain) and other income (expense) (1.8) (1.1)
Realized gain on investments   (2.0)
Impairment of investment   4.5
Income before finance items and income taxes 190.6 234.0
Finance items    
Finance income 3.1 5.4
Finance expenses (4.6) (3.4)
Operating Segments | Mining Segment    
Segment Reporting    
Revenue 567.1 628.0
Income/(expenses)    
Costs of sales 112.3 137.4
Depletion and depreciation 206.6 246.3
Gross profit 248.2 244.3
Operating Segments | Energy Segment    
Segment Reporting    
Revenue 86.1 47.0
Income/(expenses)    
Costs of sales 5.9 4.6
Depletion and depreciation 37.3 22.6
Gross profit $ 42.9 $ 19.8