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Financial Statements for Guarantors of the Senior Notes (Details Textual) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]    
Restricted cash $ 234.7us-gaap_RestrictedCashAndCashEquivalents $ 260.7us-gaap_RestrictedCashAndCashEquivalents
Assets 8,733.8us-gaap_Assets 7,313.4us-gaap_Assets
Combined Non-Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Restricted cash 194.4us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 208.3us-gaap_RestrictedCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net book value of equipment pledged as collateral 3,936.8trn_NetBookValueofEquipmentPledgedasCollateral
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 3,733.9trn_NetBookValueofEquipmentPledgedasCollateral
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net Book Value of Equipment Securing Capital Lease Obligations 87.5trn_NetBookValueOfEquipmentSecuringCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 90.2trn_NetBookValueOfEquipmentSecuringCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Assets 6,234.8us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 5,167.5us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Foreign locations | Combined Non-Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Assets $ 395.5us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= trn_ForeignMember		 $ 306.9us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
/ us-gaap_StatementGeographicalAxis
= trn_ForeignMember