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Divestitures and Assets Held for Sale - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Aug. 24, 2020
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Consideration		$ 60.5
Disposal Group Including Discontinued Operation Cash Proceeds	$ 64.1

X

- Definition

Disposal Group Including Discontinued Operation Cash Proceeds

+ References

No definition available.

+ Details

Name:	tg_DisposalGroupIncludingDiscontinuedOperationCashProceeds
Namespace Prefix:	tg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant