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Joint Ventures and Noncontrolling Interests (Details) | 12 Months Ended |
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Dec. 31, 2019 | Oct. 22, 2018
Eagle Steel Products, Inc. |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in equity method investment sold | 45.00% |
Oregon Feralloy Partners LLC |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in equity method investment | 40.00% |
Acero Prime S. de R.L. de C.V. |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in consolidated investments other than equity method investment | 100.00% | 60.00%
Feralloy Processing Company |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in consolidated investments other than equity method investment | 51.00% |
Indiana Pickling & Processing Company |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in consolidated investments other than equity method investment | 56.00% |
Valex Corp. | South Korea |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in consolidated investments other than equity method investment | 96.00% |
Minimum |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in equity method investment | 20.00% |
Percentage of ownership for consolidation of financial statements | 50.00% |
Maximum |  |
Joint Ventures and Noncontrolling Interests |  |
Ownership percentage in equity method investment | 50.00% |

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