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Long-term Debt - Non-U.S. Bank Debt (Details)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2015
Australia Facility [Member]
USD ($)
Mar. 31, 2015
Australia Facility [Member]
AUD
Dec. 31, 2014
Australia Facility [Member]
USD ($)
Mar. 31, 2015
Uncommitted Working Capital Facility [Domain]
USD ($)
Mar. 31, 2015
Overdraft Facility [Member]
USD ($)
Dec. 31, 2014
Overdraft Facility [Member]
USD ($)
Short-term Debt [Line Items]            
Credit Facility, Maximum Borrowing Capacity   20.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= trs_AustraliaFacilityMember
       
Foreign Debt, Amount Outstanding 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= trs_AustraliaFacilityMember
  0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= trs_AustraliaFacilityMember
12.5us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= trs_UncommittedWorkingCapitalFacilityDomain
0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= trs_OverdraftFacilityMember
0.1us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= trs_OverdraftFacilityMember
Debt Instrument, Maturity Date Aug. 31, 2015 Aug. 31, 2015   May 29, 2015    
Overdraft Facility         $ 1.0trs_OverdraftFacility
/ us-gaap_ShortTermDebtTypeAxis
= trs_OverdraftFacilityMember