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v3.20.4

Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment |  |  |
Interest costs capitalized | $ | $ 0.2 | $ 2.3 | $ 3.2
Labor Concentrations |  |  |
Number of employees | 841 |  |
Percentage of domestic employees | 3.00% |  |
Brazil |  |  |
Labor Concentrations |  |  |
Number of employees | 292 |  |
Cokemaking Operations |  |  |
Labor Concentrations |  |  |
Number of employees | 0.41 |  |
Coke and energy plant, machinery and equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Useful life | 25 years |  |
Coke and energy plant, machinery and equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Useful life | 30 years |  |
Logistics plant, machinery and equipment | Minimum |  |  |
Property, Plant and Equipment |  |  |
Useful life | 15 years |  |
Logistics plant, machinery and equipment | Maximum |  |  |
Property, Plant and Equipment |  |  |
Useful life | 35 years |  |

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