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Acquisitions and Divestitures (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Goodwill $ 773.2us-gaap_Goodwill $ 278.2us-gaap_Goodwill
Meyer    
Business Acquisition [Line Items]    
Accounts receivable 29.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Inventories 36.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Property, plant, and equipment 70.5us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Goodwill 409.1us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Other assets 76.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Accounts payable (15.4)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Accrued liabilities (10.1)trn_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember
 
Total net assets acquired $ 595.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= trn_MeyerMember