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Divestitures and Assets Held for Sale - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 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 |

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- Definition Disposal Group Including Discontinued Operation Cash Proceeds + References No definition available. + Details
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Namespace Prefix: | tg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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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