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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Property, plant and equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Feb. 24, 2022
Property, plant and equipment |  |  |
Balance at January 1, 2023 | $ 7,741.4 |  |
Capitalized interest | 108.9 | $ 66.5 |
Reversals of impairment charges |  | 243.2 |
Balance at December 31, 2023 | 7,963.2 | 7,741.4 |
Assets under construction | 831.1 | 649.6 |
Assets not being depreciated | $ 2,982.5 | $ 2,731.2 |
Capitalized interest, weighted average borrowing rate | 6.56% | 4.78% |
Right of use assets | $ 31.7 | $ 48.9 |
Right-of-use assets for lease arrangements entered | 7.9 | 14.8 |
Depreciation for leased right-of-use assets | 14.3 | 20.1 |
Great Bear Resources Ltd. ("Great Bear") |  |  |
Property, plant and equipment |  |  |
Significant pre-development properties | 1,492.0 | 1,402.9 | $ 0.3
Cost |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 19,140.7 | 21,602.4 |
Additions | 1,233.1 | 781.1 |
Acquisitions |  | 1,368.4 |
Capitalized interest | 108.9 | 66.5 |
Disposals | (117.9) | (4,677.9) |
Change in reclamation and remediation obligations | 102.3 | (6.4) |
Other | 16.9 | 6.6 |
Balance at December 31, 2023 | 20,484.0 | 19,140.7 |
Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | (11,399.3) | (13,984.7) |
Disposals | 102.7 | 3,738.5 |
Depreciation, depletion and amortization | (1,224.2) | (909.9) |
Impairment charges |  | (243.2) |
Balance at December 31, 2023 | (12,520.8) | (11,399.3) |
Land, plant and equipment |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 3,349.7 |  |
Balance at December 31, 2023 | 3,486.5 | 3,349.7 |
Assets under construction | 542.0 | 338.4 |
Assets not being depreciated | 806.6 | 593.5 |
Land, plant and equipment | Cost |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 9,515.2 | 10,524.5 |
Additions | 677.5 | 463.9 |
Acquisitions |  | 0.6 |
Capitalized interest | 23.3 | 17.9 |
Disposals | (110.2) | (1,496.0) |
Other | 32.8 | 4.3 |
Balance at December 31, 2023 | 10,138.6 | 9,515.2 |
Land, plant and equipment | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | (6,165.5) | (6,886.3) |
Disposals | 102.7 | 1,326.6 |
Depreciation, depletion and amortization | (589.3) | (490.7) |
Impairment charges |  | (115.1) |
Balance at December 31, 2023 | (6,652.1) | (6,165.5) |
Development and operating properties |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 2,988.8 |  |
Balance at December 31, 2023 | 2,984.7 | 2,988.8 |
Assets under construction | 267.4 | 311.2 |
Assets not being depreciated | 683.9 | 734.8 |
Development and operating properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 8,222.6 | 10,560.6 |
Additions | 532.7 | 310.1 |
Capitalized interest | 19.4 | 18.9 |
Disposals | (7.7) | (2,825.9) |
Change in reclamation and remediation obligations | 102.3 | (6.4) |
Other | (15.9) | 3.5 |
Balance at December 31, 2023 | 8,853.4 | 8,222.6 |
Transferred to capitalized development |  | 161.8 |
Transfers |  | 161.8 |
Development and operating properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | (5,233.8) | (7,098.4) |
Disposals | 0.0 | 2,411.9 |
Depreciation, depletion and amortization | (634.9) | (419.2) |
Impairment charges |  | (128.1) |
Balance at December 31, 2023 | (5,868.7) | (5,233.8) |
Pre-development properties |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 1,402.9 |  |
Balance at December 31, 2023 | 1,492.0 | 1,402.9 |
Assets under construction | 21.7 |  |
Assets not being depreciated | 1,492.0 | 1,402.9 |
Exploration and evaluation expenses, capitalised | 89.2 | 36.8 |
Exploration and evaluation expenses | 68.5 | 87.0 |
Pre-development properties | Cost |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 1,402.9 | 517.3 |
Additions | 22.9 | 7.1 |
Acquisitions |  | 1,367.8 |
Capitalized interest | 66.2 | 29.7 |
Disposals | 0.0 | (356.0) |
Other | 0.0 | (1.2) |
Balance at December 31, 2023 | 1,492.0 | 1,402.9 |
Transferred to capitalized development |  | (161.8) |
Transfers |  | (161.8) |
Pre-development properties | Accumulated depreciation, depletion, amortization and impairment |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 0.0 |  |
Disposals | 0.0 |  |
Depreciation, depletion and amortization | 0.0 |  |
Balance at December 31, 2023 | 0.0 | 0.0 |
Exploration and evaluation assets |  |  |
Property, plant and equipment |  |  |
Balance at January 1, 2023 | 1,476.3 |  |
Capitalized interest | 66.3 | 29.2 |
Balance at December 31, 2023 | 1,569.7 | 1,476.3 |
Exploration and evaluation expenses, capitalised | 93.4 | 44.8 |
Exploration and evaluation expenses | $ 158.9 | $ 135.9 |

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