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Acquisitions and Divestitures (Details 2) (Meyer, USD $)
In Millions, unless otherwise specified
 1 Months Ended
Aug. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible Assets Acquired $ 75.0trn_IntangibleAssetsAcquired
Trademarks/trade names  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary estimated fair value 34.1us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Customer relationships  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary estimated fair value 35.3us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Weighted average useful life 10 years 6 months
Technology  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary estimated fair value $ 5.6us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Weighted average useful life 5 years