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SEGMENTED INFORMATION - Significant customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Segmented Information    
Metal sales $ 4,213.4 $ 3,497.3
Percentage of total metal sales 37.40% 36.30%
Customers exceeding 10% of annual metal sales    
Segmented Information    
Metal sales $ 1,575.6 $ 1,270.1
Customer 1    
Segmented Information    
Metal sales 648.6 517.3
Customer 2    
Segmented Information    
Metal sales 498.5 397.8
Customer 3    
Segmented Information    
Metal sales 428.5 355.0
Fort Knox | Operating segments    
Segmented Information    
Metal sales 422.9 279.6
Fort Knox | Operating segments | Customer 1    
Segmented Information    
Metal sales 36.1 11.3
Fort Knox | Operating segments | Customer 2    
Segmented Information    
Metal sales 17.6 31.5
Fort Knox | Operating segments | Customer 3    
Segmented Information    
Metal sales 73.1 24.2
Round Mountain | Operating segments    
Segmented Information    
Metal sales 565.5 502.2
Round Mountain | Operating segments | Customer 1    
Segmented Information    
Metal sales 83.7 56.3
Round Mountain | Operating segments | Customer 2    
Segmented Information    
Metal sales 22.9 49.0
Round Mountain | Operating segments | Customer 3    
Segmented Information    
Metal sales 81.6 14.5
Bald Mountain | Operating segments    
Segmented Information    
Metal sales 330.5 249.2
Bald Mountain | Operating segments | Customer 1    
Segmented Information    
Metal sales 48.3 17.0
Bald Mountain | Operating segments | Customer 2    
Segmented Information    
Metal sales 14.9 40.4
Bald Mountain | Operating segments | Customer 3    
Segmented Information    
Metal sales 43.7 16.7
Paracatu | Operating segments    
Segmented Information    
Metal sales 960.7 856.3
Paracatu | Operating segments | Customer 1    
Segmented Information    
Metal sales 109.4 59.4
Paracatu | Operating segments | Customer 2    
Segmented Information    
Metal sales 54.3 76.8
Paracatu | Operating segments | Customer 3    
Segmented Information    
Metal sales 121.5 181.1
Kupol | Operating segments    
Segmented Information    
Metal sales 904.6 734.4
Kupol | Operating segments | Customer 1    
Segmented Information    
Metal sales 100.6 145.4
Kupol | Operating segments | Customer 2    
Segmented Information    
Metal sales 225.5 55.8
Tasiast | Operating segments    
Segmented Information    
Metal sales 718.0 532.8
Tasiast | Operating segments | Customer 1    
Segmented Information    
Metal sales 233.1 175.5
Tasiast | Operating segments | Customer 2    
Segmented Information    
Metal sales 109.3 78.5
Tasiast | Operating segments | Customer 3    
Segmented Information    
Metal sales 45.0 66.6
Chirano | Operating segments    
Segmented Information    
Metal sales 295.1 281.6
Chirano | Operating segments | Customer 1    
Segmented Information    
Metal sales 36.8 51.7
Chirano | Operating segments | Customer 2    
Segmented Information    
Metal sales 54.0 57.8
Chirano | Operating segments | Customer 3    
Segmented Information    
Metal sales 61.9 47.8
Corporate and other    
Segmented Information    
Metal sales 16.1 61.2
Corporate and other | Operating segments | Customer 1    
Segmented Information    
Metal sales 0.6 0.7
Corporate and other | Operating segments | Customer 2    
Segmented Information    
Metal sales   8.0
Corporate and other | Operating segments | Customer 3    
Segmented Information    
Metal sales $ 1.7 $ 4.1