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Customer Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2020
Risks and Uncertainties [Abstract] |
Schedules of Concentration of Risk, by Risk Factor | The tables below shows sales to the Company's significant customers:
|  | Year Ended December 31, |  |
|  | 2020 |  |  |  |  |
|  | Sales and other operating revenue |  | Percent of Company sales and other operating revenue |  |  |  |  |
|  | (Dollars in millions) |  |
Cliffs Steel / AM USA(1)(2) |  | $ | 687.3 |  |  | 51.6 | % |  |  |  |  |
Cliffs Steel / AK Steel(1)(2) |  | $ | 355.8 |  |  | 26.7 | % |  |  |  |  |
U.S. Steel(3) |  | $ | 208.2 |  |  | 15.6 | % |  |  |  |  |
|  | Years Ended December 31, |  |
|  |  |  |  | 2019 |  |  |  | 2018 |  |
|  |  |  |  | Sales and other operating revenue |  | Percent of Company sales and other operating revenue |  |  |  | Sales and other operating revenue |  | Percent of Company sales and other operating revenue |  |
|  | (Dollars in millions) |  |
AM USA(2) |  |  |  |  | $ | 786.4 |  |  | 49.1 | % |  |  |  | $ | 695.6 |  |  | 47.9 | % |  |
AK Steel(2) |  |  |  |  | $ | 433.3 |  |  | 27.1 | % |  |  |  | $ | 377.9 |  |  | 26.0 | % |  |
U.S. Steel(3) |  |  |  |  | $ | 255.4 |  |  | 16.0 | % |  |  |  | $ | 206.8 |  |  | 14.3 | % |  |
(1)Combined sales to Cliffs Steel/AM USA and Cliffs Steel/AK Steel were $1,043.1 million, or 78.3 percent of total Company sales and other operating revenue for the year ended December 31, 2020. (2)Represents revenues included in our Domestic Coke segment. (3)Represents revenues included in our Domestic Coke and Logistics segments.

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