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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Goodwill by Segment    
Goodwill $ 771.7us-gaap_Goodwill [1] $ 773.2us-gaap_Goodwill [2]
Rail Group    
Goodwill by Segment    
Goodwill 134.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailGroupMember		 134.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailGroupMember		 [2]
Construction Products Group    
Goodwill by Segment    
Goodwill 128.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_ConstructionProductsGroupMember		 128.3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_ConstructionProductsGroupMember		 [2]
Energy Equipment Group    
Goodwill by Segment    
Goodwill 507.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_EnergyEquipmentGroupMember		 508.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_EnergyEquipmentGroupMember		 [2]
Railcar Leasing and Management Services Group    
Goodwill by Segment    
Goodwill $ 1.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember		 $ 1.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember		 [2]
[1] (unaudited)
[2] (as reported)