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ACQUISITION OF AK STEEL (Narrative) (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Mar. 13, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 1,535.5 |  |  |
Revenues | [1] |  |  | $ 359.1 | $ 157.0
Net income (loss) |  |  |  | (52.1) | (22.1)
Business Combination, Acquisition Related Costs |  |  |  | $ 42.5 | 0.0
AK Steel Holding Corporation [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transfered, Exchange Ratio |  |  |  | 0.400 |
Business Combination, Consideration Transferred |  | $ 1,500.0 |  |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  | $ 6,359.4 |
Revenues |  |  | $ 217.5 |  |
Net income (loss) |  |  | (55.1) |  |
Severance costs |  |  | $ 17.6 |  |
Intersegment Eliminations [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  |  |  | $ 67.8 | $ 67.4
[1] | 1 Includes Realization of deferred revenue of $34.6 million for the three months ended March 31, 2020.

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