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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 11, 2016
Property, plant and equipment |  |  |
Balance, beginning of period | $ 4,917.6 |  |
Impairment, net of reversals | (21.5) | $ (68.3) |
Capitalized interest | 25.1 | 15.2 |
Balance, end of period | 4,887.2 | 4,917.6 |
Amount included above as at December 31, 2016: |  |  |
Assets under construction | 650.6 | 492.9 |
Assets not being depreciated | $ 1,081.6 | $ 952.5 |
Capitalized interest, weighted average borrowing rate | 5.54% | 4.90% |
Round Mountain Gold Corporation/KG Mining (Round Mountain) Inc. |  |  |
Amount included above as at December 31, 2016: |  |  |
Ownership interest (as a percentage) |  |  | 50.00%
Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | $ 15,925.8 | $ 15,147.9 |
Additions | 925.4 | 653.3 |
Acquisitions |  | 817.5 |
Book value of Round Mountain prior to remeasurement on acquisition |  | (654.1) |
Capitalized interest | 25.1 | 15.2 |
Disposals | (177.7) | (58.5) |
Other | 3.1 | 4.5 |
Balance, end of period | 16,701.7 | 15,925.8 |
Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (11,008.2) | (10,554.2) |
Depreciation, depletion and amortization | (900.8) | (927.5) |
Impairment, net of reversals | (21.5) | (68.3) |
Book value of Round Mountain prior to remeasurement on acquisition |  | 493.0 |
Disposals | 118.0 | 50.4 |
Other | (2.0) | (1.6) |
Balance, end of period | (11,814.5) | (11,008.2) |
Land, plant and equipment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 2,714.9 |  |
Balance, end of period | 3,066.3 | 2,714.9 |
Amount included above as at December 31, 2016: |  |  |
Assets under construction | 534.2 | 373.5 |
Assets not being depreciated | 723.3 | 545.3 |
Land, plant and equipment | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 7,791.3 | 7,332.2 |
Additions | 626.9 | 445.6 |
Acquisitions |  | 417.4 |
Book value of Round Mountain prior to remeasurement on acquisition |  | (359.4) |
Capitalized interest | 13.8 | 10.4 |
Disposals | (44.5) | (57.8) |
Other | (12.8) | 2.9 |
Balance, end of period | 8,374.7 | 7,791.3 |
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (5,076.4) | (4,835.1) |
Depreciation, depletion and amortization | (529.3) | (528.1) |
Impairment, net of reversals | 260.9 | (68.3) |
Book value of Round Mountain prior to remeasurement on acquisition |  | 305.4 |
Disposals | 38.8 | 50.4 |
Other | (2.4) | (0.7) |
Balance, end of period | (5,308.4) | (5,076.4) |
Development and operating properties |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 2,117.8 |  |
Balance, end of period | 1,805.4 | 2,117.8 |
Amount included above as at December 31, 2016: |  |  |
Assets under construction | 116.4 | 119.4 |
Assets not being depreciated | 342.8 | 322.3 |
Development and operating properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 7,970.2 | 7,651.4 |
Additions | 298.5 | 207.7 |
Acquisitions |  | 400.1 |
Book value of Round Mountain prior to remeasurement on acquisition |  | (294.7) |
Capitalized interest | 11.3 | 4.8 |
Disposals |  | (0.7) |
Other | 31.5 | 1.6 |
Balance, end of period | 8,311.5 | 7,970.2 |
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (5,852.4) | (5,639.7) |
Depreciation, depletion and amortization | (371.5) | (399.4) |
Impairment, net of reversals | (282.4) |  |
Book value of Round Mountain prior to remeasurement on acquisition |  | 187.6 |
Other | 0.2 | (0.9) |
Balance, end of period | (6,506.1) | (5,852.4) |
Pre-development properties |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 84.9 |  |
Balance, end of period | 15.5 | 84.9 |
Amount included above as at December 31, 2016: |  |  |
Assets not being depreciated | 15.5 | 84.9 |
Pre-development properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 164.3 | 164.3 |
Disposals | (133.2) |  |
Other | (15.6) |  |
Balance, end of period | 15.5 | 164.3 |
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (79.4) | (79.4) |
Disposals | 79.2 |  |
Other | 0.2 |  |
Balance, end of period |  | (79.4) |
Exploration and evaluation assets |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 216.8 |  |
Acquisitions | 0.0 | 0.0 |
Transferred to capitalized development | 0.2 | 0.0 |
Disposals | 54.1 | 0.0 |
Balance, end of period | 164.4 | 216.8 |
Amount included above as at December 31, 2016: |  |  |
Exploration and evaluation expenses, capitalised | 1.9 | 1.2 |
Exploration and evaluation expenses | $ 6.7 | $ 6.8 |

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