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v3.20.4

Segment Information Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting [Abstract] |  |  |
Export Sales from the United States of America | $ 70.0 | $ 74.1 | $ 69.9

X
- Definition Export Sales from the United States of America + References No definition available. + Details
Name: | trs_ExportSalesFromUnitedStatesOfAmerica
Namespace Prefix: | trs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration