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Investments Ownership Positions in Significant Unconsolidated (Details) | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 01, 2016 | Dec. 31, 2015
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Windfield Holdings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 49.00% | 49.00% |  | 49.00%
Nippon Aluminum Alkyls |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% | 50.00% |  | 50.00%
Magnifin Magnesiaprodukte GmbH & Co. KG |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 0.00% | 0.00% | 50.00% | 50.00%
Nippon Ketjen Company Limited |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% | 50.00% |  | 50.00%
Eurecat S.A. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% | 50.00% |  | 50.00%
Fabrica Carioca de Catalisadores S.A. |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage | 50.00% | 50.00% |  | 50.00%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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