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Debt - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Oct. 17, 2019 | Apr. 10, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | $ 2.5 |  |  | $ 2.7
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 474.8 |  |  | 399.7
Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0.2 |  |  | 0.3
Corporate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 474.8 |  |  | 399.7
Corporate | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0.2 |  |  | 0.3
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 399.8 |  |  | 399.7
Corporate | Revolving Credit Facility [Member] | Line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 450.0 |  |  |
Proceeds from Lines of Credit | 825.0 |  |  |
Repayments of Lines of Credit | 750.0 |  |  |
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 75.0 |  |  | 0.0
Line of Credit Facility, Remaining Borrowing Capacity | $ 339.5 |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.50% |  |  |
Line of Credit Facility, Interest Rate at Period End | 0.20% |  |  |
Corporate | Letter of credit | Line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of Credit Outstanding, Amount | $ 35.5 |  |  |
TILC [Member] | Railcar Leasing and Management Services Group | Revolving Credit Facility [Member] | Line of credit | TILC warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.69% |  |  |
Borrowings on Warehouse Loan Facility | $ 663.1 |  |  |
Repayments on Warehouse Loan Facility | 492.1 |  |  |
Long-term Line of Credit | 545.8 |  |  | 374.8
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2018 Secured Railcar Equipment Notes [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0.2 |  |  | 0.2
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | TRIHC 2018 Secured Railcar Equipment Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 2.1 |  |  | 2.5
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group | 2019 Secured Railcar Equipment Notes [Domain] [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Unamortized Discount | 0.2 |  |  | $ 0.0
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 | 204.2 |  |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | 2019 Secured Railcar Equipment Notes Class A1 Notes [Domain] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 106.9 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.39% |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Repayments | 125.0 |  |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Repayments |  | $ 125.0 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | TILC warehouse facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Repayments | $ 347.0 |  |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | TILC warehouse facility | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Repayments |  | 167.0 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 528.3 |
Debt Instrument, Interest Rate, Stated Percentage | 3.82% |  |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | 2019 Secured Railcar Equipment Notes [Domain] [Domain] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | 386.5 |  |
Trinity Rail Leasing 2019 [Domain] [Domain] | Secured Debt [Member] | 2019 Secured Railcar Equipment Notes Class A2 Notes [Domain] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 279.6 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.10% |  |
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% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Corporate | Revolving Credit Facility [Member] | Line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.25% |  |  |

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