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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Property, plant and equipment |  |  |
Balance, beginning of period | $ 6,340.0 |  |
Capitalized interest | 49.1 | $ 47.4 |
Balance, end of period | 7,653.5 | 6,340.0 |
Assets under construction | 749.0 | 747.0 |
Assets not being depreciated | $ 1,842.2 | $ 1,287.6 |
Capitalized interest, weighted average borrowing rate | 5.20% | 5.49% |
Right of use assets | $ 76.2 | $ 54.1 |
Right-of-use assets for lease arrangements entered | 38.2 | 22.7 |
Depreciation for leased right-of-use assets | 16.1 | 11.5 |
Chulbatkan license |  |  |
Property, plant and equipment |  |  |
Additions | 457.3 |  |
Peak Gold, LLC |  |  |
Property, plant and equipment |  |  |
Balance, end of period | $ 457.3 |  |
Ownership interest in subsidiary (as a percentage) | 70.00% |  |
Percentage of equity interest acquired |  |  | 70.00%
Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | $ 19,269.0 | 18,014.2 |
Additions | 1,090.9 | 1,274.0 |
Acquisitions | 465.4 |  |
Capitalized interest | 49.1 | 47.4 |
Disposals | (83.0) | (69.9) |
Other | 0.1 | 3.3 |
Balance, end of period | 20,791.5 | 19,269.0 |
Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (12,929.0) | (12,495.1) |
Depreciation, depletion and amortization | (970.2) | (853.5) |
Reversals of impairment charges | 689.0 | 361.8 |
Disposals | 73.8 | 60.5 |
Other | (1.6) | (2.7) |
Balance, end of period | (13,138.0) | (12,929.0) |
IFRS 16 |  |  |
Property, plant and equipment |  |  |
Right-of-use assets for lease arrangements entered |  | 42.9 |
Land, plant and equipment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 3,600.9 |  |
Balance, end of period | 3,718.7 | 3,600.9 |
Assets under construction | 540.8 | 308.8 |
Assets not being depreciated | 769.9 | 538.3 |
Land, plant and equipment | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 9,715.0 | 9,184.2 |
Additions | 535.5 | 607.5 |
Acquisitions | 8.2 |  |
Capitalized interest | 22.8 | 14.7 |
Disposals | (82.9) | (69.9) |
Other | (8.6) | (21.5) |
Balance, end of period | 10,190.0 | 9,715.0 |
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (6,114.1) | (5,702.1) |
Depreciation, depletion and amortization | (589.9) | (572.9) |
Reversals of impairment charges | 160.5 | 102.4 |
Disposals | 73.8 | 60.5 |
Other | (1.6) | (2.0) |
Balance, end of period | (6,471.3) | (6,114.1) |
Development and operating properties |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 2,725.7 |  |
Balance, end of period | 3,469.5 | 2,725.7 |
Assets under construction | 189.1 | 438.2 |
Assets not being depreciated | 607.0 | 735.9 |
Development and operating properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 9,540.6 | 8,816.6 |
Additions | 539.9 | 666.5 |
Acquisitions | 15.4 |  |
Capitalized interest | 25.5 | 32.7 |
Disposals | 0.0 |  |
Other | 14.8 | 24.8 |
Balance, end of period | 10,136.2 | 9,540.6 |
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | (6,814.9) | (6,793.0) |
Depreciation, depletion and amortization | (380.3) | (280.6) |
Reversals of impairment charges | 528.5 | 259.4 |
Disposals | 0.0 |  |
Other | 0.0 | (0.7) |
Balance, end of period | (6,666.7) | (6,814.9) |
Pre-development properties |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 13.4 |  |
Balance, end of period | 465.3 | 13.4 |
Assets under construction | 19.1 |  |
Assets not being depreciated | 465.3 | 13.4 |
Pre-development properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 13.4 | 13.4 |
Additions | 15.5 |  |
Acquisitions | 441.8 |  |
Capitalized interest | 0.8 |  |
Disposals | (0.1) |  |
Other | (6.1) |  |
Balance, end of period | 465.3 | 13.4 |
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 0.0 |  |
Depreciation, depletion and amortization | 0.0 |  |
Disposals | 0.0 |  |
Other | 0.0 |  |
Balance, end of period | 0.0 | 0.0 |
Exploration and evaluation assets |  |  |
Property, plant and equipment |  |  |
Balance, beginning of period | 251.4 |  |
Acquisitions |  | 0.0 |
Transferred to capitalized development | 311.9 |  |
Reversals of impairment charges | (90.9) |  |
Balance, end of period | 526.1 | 251.4 |
Exploration and evaluation expenses, capitalised | 38.4 | 20.7 |
Exploration and evaluation expenses | $ 19.1 | $ 17.4 |

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