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Document And Entity Information (Details)	12 Months Ended
	Dec. 31, 2020
Cover [Abstract]
Entity Registrant Name	TREDEGAR CORPORATION
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Entity Central Index Key	0000850429
Entity Filer Category	Accelerated Filer

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