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Mineral Property, Pland and Equipment (Net Value Carrying Values) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment $ 2,813.3 $ 2,753.4
Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 814.0 769.1
Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 1,672.2 1,588.3
Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 90.7 75.4
Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 236.4 320.6
Operating segments [member] | Young-Davidson [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 1,444.3 1,432.0
Operating segments [member] | Young-Davidson [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 608.9 589.5
Operating segments [member] | Young-Davidson [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 744.7 767.1
Operating segments [member] | Young-Davidson [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 90.7 75.4
Operating segments [member] | Young-Davidson [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | Mulatos [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 211.4 212.0
Operating segments [member] | Mulatos [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 115.6 112.9
Operating segments [member] | Mulatos [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 95.8 99.1
Operating segments [member] | Mulatos [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | Mulatos [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | Island Gold [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 800.1 774.9
Operating segments [member] | Island Gold [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 79.5 54.8
Operating segments [member] | Island Gold [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 720.6 720.1
Operating segments [member] | Island Gold [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | Island Gold [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | El Chanate [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 2.3 6.1
Operating segments [member] | El Chanate [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 1.5 4.1
Operating segments [member] | El Chanate [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.8 2.0
Operating segments [member] | El Chanate [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | El Chanate [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Operating segments [member] | Kirazli Segment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 113.5  
Operating segments [member] | Kirazli Segment [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 3.2  
Operating segments [member] | Kirazli Segment [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 110.3  
Operating segments [member] | Kirazli Segment [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0  
Operating segments [member] | Kirazli Segment [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0  
Corporate and other [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 241.7 328.4
Corporate and other [Member] | Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 5.3 7.8
Corporate and other [Member] | Mineral Property - Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Corporate and other [Member] | Mineral Property - Non-Depletable [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment 0.0 0.0
Corporate and other [Member] | Exploration and evaluation assets [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Mineral property, plant and equipment $ 236.4 $ 320.6