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Railcar Leasing and Management Services Group (Details 2) (Railcar Leasing and Management Services Group, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Railcar Leasing and Management Services Group
 
Future contractual minimum rental revenues on leases  
2015 $ 462.9us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
2016 388.8us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
2017 319.9us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
2018 248.1us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
2019 168.5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
Thereafter 227.2us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember
Total $ 1,815.4us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
/ us-gaap_StatementBusinessSegmentsAxis
= trn_RailcarLeasingAndManagementServicesGroupMember