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Joint Ventures and Noncontrolling Interests (Details) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2014 USD ($) | Dec. 31, 2015 item | Dec. 15, 2015 | Sep. 11, 2015 | Nov. 03, 2014
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Number of joint ventures in which the entity has a noncontrolling interest | item |  | 2 |  |  |
Valex Corp. | South Korea |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in investments other than equity method investment |  | 95.00% |  |  |
Indiana Pickling & Processing Company |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in investments other than equity method investment |  | 56.00% |  |  |
Feralloy Processing Company |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in investments other than equity method investment |  | 51.00% |  |  |
FP Structural Solutions |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in investments other than equity method investment |  | 70.00% |  |  |
Eagle Steel Products, Inc. |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in equity method investment |  | 45.00% |  |  |
Acero Prime S. de R.L. de C.V. |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in equity method investment |  | 60.00% |  |  | 40.00%
Gain on equity interest | $ 11.4 |  |  |  |
Total purchase price | 57.6 |  |  |  |
Noncontrolling interest | $ 22.6 |  |  |  |
Ownership percentage in investments other than equity method investment |  | 60.00% |  |  |
Oregon Feralloy Partners LLC |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in equity method investment |  | 40.00% |  |  |
Minimum |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in equity method investment |  | 20.00% |  |  |
Percentage of ownership for consolidation of financial statements |  | 50.00% |  |  |
Minimum | Valex Corp. |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in consolidated subsidiary |  |  | 97.00% |  |
Minimum | Valex Corp. | People's Republic of China |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in consolidated subsidiary |  |  |  | 92.00% |
Maximum |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in equity method investment |  | 50.00% |  |  |
Maximum | Valex Corp. |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in consolidated subsidiary |  | 100.00% |  |  |
Maximum | Valex Corp. | People's Republic of China |  |  |  |  |
Joint Ventures and Noncontrolling Interests |  |  |  |  |
Ownership percentage in consolidated subsidiary |  | 100.00% |  |  |

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