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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Depreciation, depletion, and amortization $ 627.1us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 668.9us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Accrued liabilities and other 97.6trn_DeferredTaxLiabilitiesAccruedLiabilitiesandOther 48.3trn_DeferredTaxLiabilitiesAccruedLiabilitiesandOther
Convertible debt 114.8us-gaap_DeferredTaxLiabilitiesFinancingArrangements 105.4us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Total deferred tax liabilities 839.5us-gaap_DeferredIncomeTaxLiabilities 822.6us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Workers compensation, pensions, and other benefits 68.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 61.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Warranties and reserves 12.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 13.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Equity items 53.3us-gaap_DeferredTaxAssetsOther 33.4us-gaap_DeferredTaxAssetsOther
Tax loss carryforwards and credits 25.1us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 27.5us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Inventory 29.2us-gaap_DeferredTaxAssetsInventory 18.8us-gaap_DeferredTaxAssetsInventory
Total deferred tax assets 188.5us-gaap_DeferredTaxAssetsGross 154.8us-gaap_DeferredTaxAssetsGross
Net deferred tax liabilities before valuation allowances 651.0trn_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowanceAndReserveForUncertainTaxProvisions 667.8trn_DeferredTaxAssetsLiabilitiesNetBeforeValuationAllowanceAndReserveForUncertainTaxProvisions
Valuation allowances 9.6us-gaap_DeferredTaxAssetsValuationAllowance 10.2us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liabilities before reserve for uncertain tax positions 660.6trn_DeferredTaxAssetsLiabilitiesNetBeforeReserveForUncertainTaxProvisions 678.0trn_DeferredTaxAssetsLiabilitiesNetBeforeReserveForUncertainTaxProvisions
Deferred tax assets included in reserve for uncertain tax positions (45.6)trn_DeferredTaxAssetsIncludedInReserveForUncertainTaxPositions (38.6)trn_DeferredTaxAssetsIncludedInReserveForUncertainTaxPositions
Adjusted net deferred tax liabilities $ 615.0us-gaap_DeferredTaxLiabilities $ 639.4us-gaap_DeferredTaxLiabilities