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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following is a summary of our intangible assets and liabilities:
|  |  | (In Millions)
| Classification 1 |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
As of June 30, 2020 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Customer relationships | Intangible assets, net |  | $ | 77.0 |  |  | $ | (1.5 | ) |  | $ | 75.5 |
Developed technology | Intangible assets, net |  | 60.0 |  |  | (1.2 | ) |  | 58.8 |
Trade names and trademarks | Intangible assets, net |  | 11.0 |  |  | (0.4 | ) |  | 10.6 |
Mining permits | Intangible assets, net |  | 72.2 |  |  | (24.5 | ) |  | 47.7 |
Total intangible assets |  |  | $ | 220.2 |  |  | $ | (27.6 | ) |  | $ | 192.6 |
Intangible liabilities: |  |  |  |  |  |  |
Above-market supply contracts | Intangible liabilities, net |  | $ | (75.0 | ) |  | $ | 2.7 |  |  | $ | (72.3 | )
As of December 31, 2019 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Mining permits | Intangible assets, net |  | $ | 72.2 |  |  | $ | (24.1 | ) |  | $ | 48.1 |
1 Amortization of intangible liabilities related to above-market supply contracts and intangible assets related to mining permits is recognized in Cost of goods sold. Amortization of all other intangible assets is recognized in Selling, general and administrative expenses.
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Estimated future amortization expense related to intangible assets at June 30, 2020 is as follows:
|  | (In Millions)
Years ending December 31, |  |
2020 (remaining period of the year) |  | $ | 5.0 |
2021 |  | 10.0 |
2022 |  | 10.0 |
2023 |  | 10.0 |
2024 |  | 10.0 |
2025 |  | 10.0 |
Schedule of Finite-Lived Intangible Liabilities, Future Amortization Credit [Table Text Block] | Estimated future amortization income related to the intangible liabilities at June 30, 2020 is as follows:
|  | (In Millions)
Years ending December 31, |  |
2020 (remaining period of the year) |  | $ | 4.1 |
2021 |  | 8.2 |
2022 |  | 8.2 |
2023 |  | 8.2 |
2024 |  | 8.2 |
2025 |  | 8.2 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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