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REVENUE RECOGNITION: - Revenue by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue Recognition |  |  |  |
Net sales | $ 1,837.2 | $ 1,529.8 | $ 3,678.4 | $ 3,113.8
Corporate, other and eliminations |  |  |  |
Revenue Recognition |  |  |  |
Net sales | (18.8) | (17.6) | (38.4) | (38.1)
Mexican Open-pit |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 1,061.1 | 899.8 | 2,129.7 | 1,852.0
Mexican Open-pit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 1,061.1 | 899.8 | 2,129.7 | 1,852.0
Mexican IMMSA Unit |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 134.3 | 107.3 | 264.0 | 217.6
Mexican IMMSA Unit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 153.1 | 124.9 | 302.4 | 255.7
Peruvian Operations |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 641.8 | 522.7 | 1,284.7 | 1,044.2
Peruvian Operations | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 641.8 | 522.7 | 1,284.7 | 1,044.2
Copper |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 1,488.5 | 1,256.1 | 2,961.9 | 2,541.9
Copper | Corporate, other and eliminations |  |  |  |
Revenue Recognition |  |  |  |
Net sales | (11.0) | (8.1) | (22.2) | (19.0)
Copper | Mexican Open-pit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 911.7 | 788.4 | 1,821.1 | 1,616.6
Copper | Mexican IMMSA Unit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 15.9 | 8.0 | 27.1 | 18.9
Copper | Peruvian Operations | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 571.9 | 467.8 | 1,135.9 | 925.4
Molybdenum |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 104.5 | 67.1 | 240.8 | 159.9
Molybdenum | Mexican Open-pit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 73.9 | 42.7 | 164.9 | 96.6
Molybdenum | Peruvian Operations | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 30.6 | 24.4 | 75.9 | 63.3
Zinc |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 94.8 | 76.7 | 189.7 | 155.7
Zinc | Corporate, other and eliminations |  |  |  |
Revenue Recognition |  |  |  |
Net sales |  | 0.3 | (0.1) |
Zinc | Mexican IMMSA Unit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 94.8 | 76.4 | 189.8 | 155.7
Silver |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 83.3 | 75.5 | 154.4 | 149.3
Silver | Corporate, other and eliminations |  |  |  |
Revenue Recognition |  |  |  |
Net sales | (7.1) | (7.5) | (14.6) | (14.9)
Silver | Mexican Open-pit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 48.1 | 42.9 | 90.7 | 90.4
Silver | Mexican IMMSA Unit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 23.9 | 20.2 | 44.5 | 39.9
Silver | Peruvian Operations | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 18.4 | 19.9 | 33.8 | 33.9
Other |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 66.1 | 54.4 | 131.6 | 107.0
Other | Corporate, other and eliminations |  |  |  |
Revenue Recognition |  |  |  |
Net sales | (0.7) | (2.3) | (1.5) | (4.2)
Other | Mexican Open-pit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 27.4 | 25.8 | 53.0 | 48.4
Other | Mexican IMMSA Unit | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | 18.5 | 20.3 | 41.0 | 41.2
Other | Peruvian Operations | Operating segment |  |  |  |
Revenue Recognition |  |  |  |
Net sales | $ 20.9 | $ 10.6 | $ 39.1 | $ 21.6

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