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Subsequent Event (Notes)	9 Months Ended
Subsequent Event (Notes)	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Event On October 10, 2018, the Company signed a definitive agreement to acquire Next Polymers Ltd., an India based engineering thermoplastics compounder. The acquisition will be funded from cash on hand or from borrowings under the Company's senior unsecured revolving credit facility. The acquired operations will be included in the Engineered Materials segment. The Company expects the acquisition to close in the first quarter of 2019, subject to customary closing conditions, and does not expect the acquisition to be material to its 2019 financial position or results of operations.