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Joint Ventures and Noncontrolling Interests (Details) $ in Millions		12 Months Ended
	Oct. 01, 2014 USD ($)	Dec. 31, 2016 item	Dec. 31, 2015	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%
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 assets	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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The percentage of ownership of common stock or equity participation in the consolidated subsidiary.

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Represents the number of joint ventures in which the entity has a noncontrolling interest.

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of assets acquired at the acquisition date.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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