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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 1,092.7 | $ 743.2 | $ 1,451.8 | [1] | $ 900.2
Realization of deferred revenue | 0.0 | 0.0 | 34.6 |  | 0.0
Steel and Manufacturing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 715.1 | 0.0 | 932.6 |  | 0.0
Steel and Manufacturing [Member] | Carbon Steel [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 431.8 | 0.0 | 570.4 |  | 0.0
Steel and Manufacturing [Member] | Stainless and Electrical Steel [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 222.5 | 0.0 | 281.9 |  | 0.0
Steel and Manufacturing [Member] | Other Product Lines [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 60.8 | 0.0 | 80.3 |  | 0.0
Mining and Pelletizing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 377.6 | 743.2 | 519.2 |  | 900.2
Mining and Pelletizing [Member] | Iron Ore [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 349.7 | 697.4 | 481.0 | [2] | 842.8
Mining and Pelletizing [Member] | Freight [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 27.9 | 45.8 | 38.2 |  | 57.4
Automotive [Member] | Steel and Manufacturing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 363.8 | 0.0 | 484.0 |  | 0.0
Infrastructure and Manufacturing [Member] | Steel and Manufacturing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 203.4 | 0.0 | 247.4 |  | 0.0
Distributors and Converters [Member] | Steel and Manufacturing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 147.9 | 0.0 | 201.2 |  | 0.0
Steel Producers [Member] | Mining and Pelletizing [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 377.6 | 743.2 | 519.2 | [3] | 900.2
Non-US [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 176.0 | $ 136.4 | $ 222.7 |  | $ 179.4
[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.
[3] | Includes Realization of deferred revenue of $34.6 million for the six months ended June 30, 2020.

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