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Consolidated Statements of Cash Flows (unaudited) (Parenthetical) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Statement of Cash Flows [Abstract] |  |
Capital expenditures – leasing, net of sold railcars owned one year or less, net cost | $ 210.3 | $ 63.2

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- Definition Payments to Acquire Leasing Assets Net of Sold Railcars Owned One Year or Less Net Cost + References No definition available. + Details
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Namespace Prefix: | trn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration