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PROPERTY, PLANT AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Property Plant and Equipment [Table Text Block] | Depreciation and depletion is recorded over the following estimated useful lives:
Asset Class |  | Basis |  | Life
Land rights and mineral rights |  | Units of production |  | Life of mine
Office and information technology |  | Straight line |  | 3 to 15 years
Buildings |  | Straight line |  | 45 years
Mining equipment |  | Straight line/Double declining balance |  | 3 to 20 years
Processing equipment |  | Straight line |  | 10 to 45 years
Electric power facilities |  | Straight line |  | 10 to 45 years
Land improvements |  | Straight line |  | 20 to 45 years
Asset retirement obligation |  | Straight line |  | Life of mine
The following table indicates the carrying value of each of the major classes of our consolidated property, plant and equipment:
| (In Millions)
| December 31,
| 2019 |  | 2018
Land rights and mineral rights | $ | 549.7 |  |  | $ | 549.6 |
Office and information technology | 71.9 |  |  | 70.0 |
Buildings | 157.8 |  |  | 87.2 |
Mining equipment | 581.9 |  |  | 548.5 |
Processing equipment | 791.8 |  |  | 645.8 |
Electric power facilities | 81.9 |  |  | 58.7 |
Land improvements | 32.5 |  |  | 23.8 |
Asset retirement obligation | 1.7 |  |  | 14.8 |
Other | 27.9 |  |  | 25.2 |
Construction-in-progress | 730.3 |  |  | 284.8 |
| 3,027.4 |  |  | 2,308.4 |
Allowance for depreciation and depletion | (1,098.4 | ) |  | (1,022.4 | )
| $ | 1,929.0 |  |  | $ | 1,286.0 |
Book Value of Land and Mineral Rights Disclosure [Table Text Block] | The net book value of the land rights and mineral rights is as follows:
| (In Millions)
| December 31,
| 2019 |  | 2018
Land rights | $ | 12.4 |  |  | $ | 12.4 |
Mineral rights: |  |  |
Cost | $ | 537.3 |  |  | $ | 537.2 |
Depletion | (134.1 | ) |  | (126.5 | )
Net mineral rights | $ | 403.2 |  |  | $ | 410.7 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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