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Segment Reporting - Financials (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Segment Reporting    
Number of operating segments | item 2  
Revenue $ 844.1 $ 653.2
Income/(expenses)    
Costs of sales 144.8 118.2
Depletion and depreciation 263.2 247.7
Gross profit 436.1 287.3
Other operating (income)/expenses    
General and administrative expenses 28.8 22.6
Impairment of royalty, streams and working interests   76.0
Gain on sale of gold bullion (2.9) (0.1)
Foreign exchange (gain) and other (income) expenses (2.8) (1.8)
Income before finance items and income taxes 413.0 190.6
Finance items    
Finance income 3.5 3.1
Finance expenses (10.6) (4.6)
Net income before income taxes 405.9 189.1
Operating Segments    
Segment Reporting    
Revenue 844.1 653.2
Income/(expenses)    
Costs of sales 144.8 118.2
Depletion and depreciation 259.7 243.9
Gross profit 439.6 291.1
Other operating (income)/expenses    
General and administrative expenses 28.8 22.6
Impairment of royalty, streams and working interests   76.0
Gain on sale of gold bullion (2.9) (0.1)
Depreciation 3.5 3.8
Foreign exchange (gain) and other (income) expenses (2.8) (1.8)
Income before finance items and income taxes 413.0 190.6
Finance items    
Finance income 3.5 3.1
Finance expenses (10.6) (4.6)
Net income before income taxes 405.9 189.1
Operating Segments | Mining Segment    
Segment Reporting    
Revenue 728.2 567.1
Income/(expenses)    
Costs of sales 137.5 112.3
Depletion and depreciation 210.7 206.6
Gross profit 380.0 248.2
Operating Segments | Energy Segment    
Segment Reporting    
Revenue 115.9 86.1
Income/(expenses)    
Costs of sales 7.3 5.9
Depletion and depreciation 49.0 37.3
Gross profit $ 59.6 $ 42.9