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SEGMENTED INFORMATION - Significant customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segmented Information |  |
Metal sales | $ 3,212.6 | $ 3,303.0
Percentage of total metal sales | 49.60% | 47.50%
Customer 1 |  |
Segmented Information |  |
Metal sales | $ 505.1 | $ 694.5
Customer 2 |  |
Segmented Information |  |
Metal sales | 376.3 | 531.5
Customer 3 |  |
Segmented Information |  |
Metal sales | 360.8 | 342.1
Customer 4 |  |
Segmented Information |  |
Metal sales | 351.9 |
Fort Knox |  |
Segmented Information |  |
Metal sales | 325.5 | 481.1
Fort Knox | Customer 1 |  |
Segmented Information |  |
Metal sales | 38.4 |
Fort Knox | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 54.4
Fort Knox | Customer 3 |  |
Segmented Information |  |
Metal sales | 56.1 | 6.4
Fort Knox | Customer 4 |  |
Segmented Information |  |
Metal sales | 17.5 |
Round Mountain |  |
Segmented Information |  |
Metal sales | 483.9 | 552.2
Round Mountain | Customer 1 |  |
Segmented Information |  |
Metal sales | 96.2 |
Round Mountain | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 60.2
Round Mountain | Customer 3 |  |
Segmented Information |  |
Metal sales | 38.8 | 19.0
Round Mountain | Customer 4 |  |
Segmented Information |  |
Metal sales | 5.6 |
Bald Mountain |  |
Segmented Information |  |
Metal sales | 403.9 | 331.5
Bald Mountain | Customer 1 |  |
Segmented Information |  |
Metal sales | 70.4 |
Bald Mountain | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 64.8
Bald Mountain | Customer 3 |  |
Segmented Information |  |
Metal sales | 19.8 | 16.4
Bald Mountain | Customer 4 |  |
Segmented Information |  |
Metal sales | 3.6 |
Paracatu |  |
Segmented Information |  |
Metal sales | 663.1 | 447.0
Paracatu | Customer 1 |  |
Segmented Information |  |
Metal sales | 46.2 |
Paracatu | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 48.8
Paracatu | Customer 3 |  |
Segmented Information |  |
Metal sales | 75.3 | 157.9
Paracatu | Customer 4 |  |
Segmented Information |  |
Metal sales | 186.4 |
Maricunga |  |
Segmented Information |  |
Metal sales | 113.6 | 52.0
Maricunga | Customer 1 |  |
Segmented Information |  |
Metal sales | 18.1 |
Maricunga | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 6.8
Maricunga | Customer 3 |  |
Segmented Information |  |
Metal sales | 38.7 | 11.6
Maricunga | Customer 4 |  |
Segmented Information |  |
Metal sales | 5.5 |
Kupol |  |
Segmented Information |  |
Metal sales | 627.7 | 726.9
Kupol | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 694.5
Kupol | Customer 2 |  |
Segmented Information |  |
Metal sales | 376.3 | 16.4
Tasiast |  |
Segmented Information |  |
Metal sales | 307.8 | 298.4
Tasiast | Customer 1 |  |
Segmented Information |  |
Metal sales | 119.4 |
Tasiast | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 146.9
Tasiast | Customer 3 |  |
Segmented Information |  |
Metal sales | 75.5 | 31.7
Tasiast | Customer 4 |  |
Segmented Information |  |
Metal sales | 62.0 |
Chirano |  |
Segmented Information |  |
Metal sales | 286.0 | 317.6
Chirano | Customer 1 |  |
Segmented Information |  |
Metal sales | 116.4 |
Chirano | Customer 2 |  |
Segmented Information |  |
Metal sales |  | 116.3
Chirano | Customer 3 |  |
Segmented Information |  |
Metal sales | 56.6 | 99.1
Chirano | Customer 4 |  |
Segmented Information |  |
Metal sales | $ 71.3 |
Corporate and other | Customer 2 |  |
Segmented Information |  |
Metal sales |  | $ 16.9

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