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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 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 liability:
|  |  | (In Millions)
| Classification |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
As of March 31, 2020 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Customer relationships | Intangible assets, net |  | $ | 91.0 |  |  | $ | (0.5 | ) |  | $ | 90.5 |
Developed technology | Intangible assets, net |  | 61.0 |  |  | (0.3 | ) |  | 60.7 |
Trade names and trademarks | Intangible assets, net |  | 11.0 |  |  | (0.1 | ) |  | 10.9 |
Mining permits | Intangible assets, net |  | 72.2 |  |  | (24.3 | ) |  | 47.9 |
Total intangible assets |  |  | $ | 235.2 |  |  | $ | (25.2 | ) |  | $ | 210.0 |
Intangible liability: |  |  |  |  |  |  |
Above-market supply contract | Intangible liability, net |  | $ | (140.0 | ) |  | $ | 2.1 |  |  | $ | (137.9 | )
As of December 31, 2019 |  |  |  |  |  |  |
Intangible assets: |  |  |  |  |  |  |
Mining permits | Intangible assets, net |  | $ | 72.2 |  |  | $ | (24.1 | ) |  | $ | 48.1 |
Finite-lived Intangible Assets Amortization Expense [Table Text Block] | Estimated future amortization expense related to intangible assets at March 31, 2020 is as follows:
|  | (In Millions)
Years ending December 31, |  |
2020 (remaining period of the year) |  | $ | 8.1 |
2021 |  | 10.8 |
2022 |  | 10.8 |
2023 |  | 10.8 |
2024 |  | 10.8 |
2025 |  | 10.8 |
Schedule of Finite-Lived Intangible Liabilities, Future Amortization Credit [Table Text Block] | Estimated future amortization income related to the intangible liability at March 31, 2020 is as follows:
|  | (In Millions)
Years ending December 31, |  |
2020 (remaining period of the year) |  | $ | 7.0 |
2021 |  | 10.9 |
2022 |  | 10.9 |
2023 |  | 10.9 |
2024 |  | 10.9 |
2025 |  | 10.9 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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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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