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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES (Notes) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets Disclosure [Text Block] | Goodwill The increase in the balance of Goodwill as of June 30, 2020, compared to December 31, 2019, is due to the preliminary assignment of $137.2 million to Goodwill in 2020 based on the preliminary purchase price allocation for the acquisition of AK Steel. The carrying amount of goodwill related to our Mining and Pelletizing segment was $2.1 million as of both June 30, 2020 and December 31, 2019. Intangible Assets and Liabilities 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. Amortization expense related to intangible assets was $2.4 million and $3.5 million for the three and six months ended June 30, 2020, respectively, and $0.2 million and $0.4 million for the three and six months ended June 30, 2019, respectively. 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 |
Income from amortization related to the intangible liabilities was $0.6 million and $2.7 million for the three and six months ended June 30, 2020, respectively. 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 The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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