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Debt - Narrative (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Apr. 10, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | $ 2,600,000 |  | $ 2,700,000
Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 200,000 |  | 300,000
Corporate | Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 200,000 |  | 300,000
Corporate | Revolving Credit Facility [Member] | Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility | 450,000,000.0 |  |
Line of Credit Facility, Borrowings and Repayments in Period | 550,000,000.0 |  |
Remaining borrowing capacity on revolving credit facility | $ 414,500,000 |  |
Effective annual interest rate yield | 1.75% |  |
Line of Credit Facility, Interest Rate at Period End | 0.25% |  |
Corporate | Letter of credit | Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Used revolving credit facility for letters of credit | $ 35,500,000 |  |
TILC [Member] | Railcar Leasing and Management Services Group | Revolving Credit Facility [Member] | Line of credit | TILC warehouse facility |  |  |
Debt Instrument [Line Items] |  |  |
Effective annual interest rate yield | 4.03% |  |
Borrowings on Warehouse Loan Facility | $ 554,700,000 |  |
Repayments on Warehouse Loan Facility | 418,400,000 |  |
Long-term Line of Credit | 511,100,000 |  | 374,800,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2018 Secured Railcar Equipment Notes [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 200,000 |  | 200,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | TRIHC 2018 Secured Railcar Equipment Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 2,100,000 |  | 2,500,000
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2019 Secured Railcar Equipment Notes [Domain] [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount | 300,000 |  | $ 0
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | Revolving Credit Facility [Member] | Line of credit | TILC warehouse facility |  |  |
Debt Instrument [Line Items] |  |  |
TILC warehouse loan, unused portion | 238,900,000 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Repayments | 125,000,000.0 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | TILC warehouse facility |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Repayments | $ 347,000,000.0 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  | $ 528,300,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.82% |
Minimum | Corporate | Revolving Credit Facility [Member] | Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate at Period End | 0.175% |  |
Maximum | Corporate | Revolving Credit Facility [Member] | Line of credit |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Interest Rate at Period End | 0.30% |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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