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SEGMENT REPORTING - Results by Segment (Details) T in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) T | Jun. 30, 2019 USD ($) T | Jun. 30, 2020 USD ($) unit T | Jun. 30, 2019 USD ($) T
Segment Reporting Information [Line Items] |  |  |  |  |
Number of Reporting Units | unit |  |  | 2 |  |
Revenues | $ 1,092.7 | $ 743.2 | $ 1,451.8 | [1] | $ 900.2
Adjusted EBITDA | (82.0) | 248.4 | (59.3) |  | 269.6
Realization of deferred revenue | $ 0.0 | $ 0.0 | $ 34.6 |  | $ 0.0
Steel and Manufacturing [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales Volume (Net Tons) | T | 619 | 0 | 818 |  | 0
Revenues | $ 715.1 | $ 0.0 | $ 932.6 |  | $ 0.0
Adjusted EBITDA | $ (104.0) | $ (1.1) | $ (115.1) |  | $ (1.9)
Mining and Pelletizing [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales Volume (Long Tons) | T | 3,718 | 6,189 | 5,069 |  | 7,739
Revenues | $ 377.6 | $ 743.2 | $ 519.2 |  | $ 900.2
Adjusted EBITDA | 82.4 | 280.5 | 164.2 |  | 328.0
Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | $ (60.4) | $ (31.0) | $ (108.4) |  | $ (56.5)
Operating Segments [Member] | Mining and Pelletizing [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales Volume (Long Tons) | T | 4,759 | 6,227 | 6,893 |  | 7,777
Revenues | $ 489.0 | $ 747.2 | $ 718.4 | [2] | $ 904.2
Intersegment Eliminations [Member] | Mining and Pelletizing [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales Volume (Long Tons) | T | (1,041) | (38) | (1,824) |  | (38)
Revenues | $ (111.4) | $ (4.0) | $ (199.2) |  | $ (4.0)
[1] | Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.
[2] | Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.

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