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SEGMENTED INFORMATION - Significant customers (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segmented Information |  |
Metal sales | $ 3,303.0 | $ 3,472.0
Customers exceeding 10% of annual metal sales |  |
Segmented Information |  |
Metal sales | $ 1,568.1 | $ 1,490.4
Percentage of total metal sales | 47.50% | 42.90%
Customer 1 |  |
Segmented Information |  |
Metal sales | $ 694.5 | $ 611.4
Customer 2 |  |
Segmented Information |  |
Metal sales | 531.5 | 473.5
Customer 3 |  |
Segmented Information |  |
Metal sales | 342.1 | 405.5
Fort Knox |  |
Segmented Information |  |
Metal sales | 481.1 | 510.8
Fort Knox | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 101.8
Fort Knox | Customer 2 |  |
Segmented Information |  |
Metal sales | 54.4 |
Fort Knox | Customer 3 |  |
Segmented Information |  |
Metal sales | 6.4 |
Round Mountain |  |
Segmented Information |  |
Metal sales | 552.2 | 477.1
Round Mountain | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 75.9
Round Mountain | Customer 2 |  |
Segmented Information |  |
Metal sales | 60.2 |
Round Mountain | Customer 3 |  |
Segmented Information |  |
Metal sales | 19.0 |
Bald Mountain |  |
Segmented Information |  |
Metal sales | 331.5 | 139.6
Bald Mountain | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 22.0
Bald Mountain | Customer 2 |  |
Segmented Information |  |
Metal sales | 64.8 |
Bald Mountain | Customer 3 |  |
Segmented Information |  |
Metal sales | 16.4 |
Paracatu |  |
Segmented Information |  |
Metal sales | 447.0 | 599.6
Paracatu | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 130.1
Paracatu | Customer 2 |  |
Segmented Information |  |
Metal sales | 48.8 |
Paracatu | Customer 3 |  |
Segmented Information |  |
Metal sales | 157.9 |
Maricunga |  |
Segmented Information |  |
Metal sales | 52.0 | 219.4
Maricunga | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 41.8
Maricunga | Customer 2 |  |
Segmented Information |  |
Metal sales | 6.8 |
Maricunga | Customer 3 |  |
Segmented Information |  |
Metal sales | 11.6 |
Kupol |  |
Segmented Information |  |
Metal sales | 726.9 | 919.2
Kupol | Customer 1 |  |
Segmented Information |  |
Metal sales | 694.5 | 20.5
Kupol | Customer 2 |  |
Segmented Information |  |
Metal sales | 16.4 | 473.5
Kupol | Customer 3 |  |
Segmented Information |  |
Metal sales |  | 405.5
Kettle River - Buckhorn |  |
Segmented Information |  |
Metal sales | 96.3 | 139.8
Kettle River - Buckhorn | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 66.6
Kettle River - Buckhorn | Customer 2 |  |
Segmented Information |  |
Metal sales | 16.9 |
Tasiast |  |
Segmented Information |  |
Metal sales | 298.4 | 208.0
Tasiast | Customer 1 |  |
Segmented Information |  |
Metal sales |  | 80.2
Tasiast | Customer 2 |  |
Segmented Information |  |
Metal sales | 146.9 |
Tasiast | Customer 3 |  |
Segmented Information |  |
Metal sales | 31.7 |
Chirano |  |
Segmented Information |  |
Metal sales | 317.6 | 258.5
Chirano | Customer 1 |  |
Segmented Information |  |
Metal sales |  | $ 72.5
Chirano | Customer 2 |  |
Segmented Information |  |
Metal sales | 116.3 |
Chirano | Customer 3 |  |
Segmented Information |  |
Metal sales | $ 99.1 |

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