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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details)
$ in Millions
 12 Months Ended
Feb. 14, 2018
item
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Oct. 02, 2018
Mar. 19, 2018
Property, plant and equipment          
Balance, beginning of period   $ 4,887.2      
Impairment, net of reversals     $ (21.5)    
Capitalized interest   41.5 25.1    
Balance, end of period   5,519.1 4,887.2    
Amount included above as at December 31, 2016:          
Assets under construction   783.5 650.6    
Assets not being depreciated   $ 1,316.8 $ 1,081.6    
Capitalized interest, weighted average borrowing rate   5.62% 5.54%    
Bald Mountain Exploration LLC          
Amount included above as at December 31, 2016:          
Percentage of equity interest acquired       50.00%  
Brazil          
Property, plant and equipment          
Balance, beginning of period   $ 1,383.1      
Balance, end of period   $ 1,585.5 $ 1,383.1    
Phase 7 concessions | Compania Minera Mantos de Oro ("MDO")          
Amount included above as at December 31, 2016:          
Percentage of equity interest acquired   50.00%     50.00%
Subsidiary of Gerdau SA | Brazil | Bald Mountain Exploration LLC          
Amount included above as at December 31, 2016:          
Number of hydroelectric power plants acquired | item   2      
Subsidiary of Gerdau SA | Brazil | Kinross Brasil Mineracao S.A. ("KBM")          
Amount included above as at December 31, 2016:          
Number of hydroelectric power plants acquired | item 2        
Bald Mountain Exploration LLC | Bald Mountain Exploration LLC          
Amount included above as at December 31, 2016:          
Percentage of equity interest acquired   50.00%      
Bald Mountain Exploration LLC | KG Mining (Bald Mountain) Inc.          
Amount included above as at December 31, 2016:          
Percentage of equity interest acquired       50.00%  
Cost          
Property, plant and equipment          
Balance, beginning of period   $ 16,701.7 15,925.8    
Additions   1,086.5 925.4    
Acquisitions   339.9      
Capitalized interest   41.5 25.1    
Disposals   (157.7) (177.7)    
Other   2.3 3.1    
Balance, end of period   18,014.2 16,701.7    
Accumulated depreciation, depletion, amortization          
Property, plant and equipment          
Balance, beginning of period   (11,814.5)      
Depreciation, depletion and amortization   (825.5)      
Disposals   146.4      
Other   (1.5)      
Balance, end of period   (12,495.1) (11,814.5)    
Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (11,814.5) (11,008.2)    
Depreciation, depletion and amortization     (900.8)    
Impairment, net of reversals     (21.5)    
Disposals     118.0    
Other     (2.0)    
Balance, end of period     (11,814.5)    
Land, plant and equipment          
Property, plant and equipment          
Balance, beginning of period   3,066.3      
Balance, end of period   3,482.1 3,066.3    
Amount included above as at December 31, 2016:          
Assets under construction   495.0 534.2    
Assets not being depreciated   719.1 723.3    
Land, plant and equipment | Cost          
Property, plant and equipment          
Balance, beginning of period   8,374.7 7,791.3    
Additions   629.4 626.9    
Acquisitions   274.8      
Capitalized interest   23.8 13.8    
Disposals   (115.7) (44.5)    
Other   (2.8) (12.8)    
Balance, end of period   9,184.2 8,374.7    
Land, plant and equipment | Accumulated depreciation, depletion, amortization          
Property, plant and equipment          
Balance, beginning of period   (5,308.4)      
Depreciation, depletion and amortization   (508.5)      
Disposals   106.5      
Other   8.3      
Balance, end of period   (5,702.1) (5,308.4)    
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (5,308.4) (5,076.4)    
Depreciation, depletion and amortization     (529.3)    
Impairment, net of reversals     260.9    
Disposals     38.8    
Other     (2.4)    
Balance, end of period     (5,308.4)    
Development and operating properties          
Property, plant and equipment          
Balance, beginning of period   1,805.4      
Balance, end of period   2,023.6 1,805.4    
Amount included above as at December 31, 2016:          
Assets under construction   288.5 116.4    
Assets not being depreciated   584.3 342.8    
Development and operating properties | Cost          
Property, plant and equipment          
Balance, beginning of period   8,311.5 7,970.2    
Additions   457.1 298.5    
Acquisitions   65.1      
Capitalized interest   17.7 11.3    
Disposals   (39.9)      
Other   5.1 31.5    
Balance, end of period   8,816.6 8,311.5    
Development and operating properties | Accumulated depreciation, depletion, amortization          
Property, plant and equipment          
Balance, beginning of period   (6,506.1)      
Depreciation, depletion and amortization   (317.0)      
Disposals   39.9      
Other   (9.8)      
Balance, end of period   (6,793.0) (6,506.1)    
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period   (6,506.1) (5,852.4)    
Depreciation, depletion and amortization     (371.5)    
Impairment, net of reversals     (282.4)    
Other     0.2    
Balance, end of period     (6,506.1)    
Pre-development properties          
Property, plant and equipment          
Balance, beginning of period   15.5      
Balance, end of period   13.4 15.5    
Amount included above as at December 31, 2016:          
Assets not being depreciated   13.4 15.5    
Pre-development properties | Cost          
Property, plant and equipment          
Balance, beginning of period   15.5 164.3    
Disposals   (2.1) (133.2)    
Other     (15.6)    
Balance, end of period   13.4 15.5    
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment          
Property, plant and equipment          
Balance, beginning of period     (79.4)    
Disposals     79.2    
Other     0.2    
Exploration and evaluation assets          
Property, plant and equipment          
Balance, beginning of period   164.4      
Acquisitions   65.1 0.0    
Transferred to capitalized development   0.0 0.2    
Disposals   (2.0) (54.1)    
Balance, end of period   230.7 164.4    
Amount included above as at December 31, 2016:          
Exploration and evaluation expenses, capitalised   3.1 1.9    
Exploration and evaluation expenses   $ 11.5 $ 6.7