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Discontinued Operations - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Jun. 30, 2013
Dec. 31, 2014
NI Industries business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from Sale of Productive Assets $ 6.7us-gaap_ProceedsFromSaleOfProductiveAssets
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= trs_NIIndustriesbusinessMember
   
Precision Tool Cutting and Specialty Fittings Line of Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from Divestiture of Businesses   1.0us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= trs_PrecisionToolCuttingAndSpecialtyFittingsLineOfBusinessMember
 
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     1.3us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= trs_PrecisionToolCuttingAndSpecialtyFittingsLineOfBusinessMember
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset     2.5us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= trs_PrecisionToolCuttingAndSpecialtyFittingsLineOfBusinessMember
Specialty Laminates, Jacketings and Insulation Tapes Line of Business [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Restructuring Charges     $ 1.8us-gaap_RestructuringCharges
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= trs_SpecialtyLaminatesJacketingsAndInsulationTapesLineOfBusinessMember