Borrowings on Warehouse Loan Facility

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- Definition

Line of Credit Facility, Remaining Borrowing Capacity Exclusive of Current Restrictions

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- Definition

Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs

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Non-Recourse Debt, Gross

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Non-Recourse Debt, Gross of Issuance Cost, Net of Discount

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- Definition

Railcars Acquired

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- Definition

Repayments on Warehouse Loan Facility

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No definition available.

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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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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.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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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.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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- Definition

The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Note 8. Debt Debt (Details) $ in Millions	12 Months Ended
Note 8. Debt Debt (Details) $ in Millions	Dec. 31, 2019 USD ($) Railcar	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Railcars Acquired	6,779
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 0.0	$ 283.9	$ 0.0
Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	524.8	399.7
Corporate Segment [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	$ 399.8	399.7
Corporate Segment [Member] \| Senior Notes [Member] \| 4.55% Senior Notes Due October 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.55%
Debt Instrument, Face Amount	$ 400.0
Revolving Credit Facility [Member] \| Corporate Segment [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	125.0	0.0
Line of Credit Facility, Current Borrowing Capacity	450.0
Line of Credit Facility, Maximum Borrowing Capacity	200.0
Proceeds from Lines of Credit	1,000.0
Repayments of Lines of Credit	875.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 289.5
Line of Credit Facility, Interest Rate at Period End	0.20%
Debt Instrument, Interest Rate, Effective Percentage	1.50%
Revolving Credit Facility [Member] \| Corporate Segment [Member] \| Line of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End	0.175%
Revolving Credit Facility [Member] \| Corporate Segment [Member] \| Line of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End	0.30%
Revolving Credit Facility [Member] \| Corporate Segment [Member] \| Line of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	1.25%
Letter of Credit [Member] \| Corporate Segment [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 35.5
Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	38.00%
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2006 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.90%
Debt Instrument, Face Amount	$ 355.0
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2009 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.66%
Debt Instrument, Face Amount	$ 238.3
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2010 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.19%
Debt Instrument, Face Amount	$ 369.2
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2017 Secured Railcar Equipment Notes [Member] [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 663.0		$ 302.4
Debt Instrument, Interest Rate, Effective Percentage	3.25%
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2018 Secured Railcar Equipment Notes [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 482.5
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2018 Class A-1 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 169.8
Debt Instrument, Interest Rate, Stated Percentage	3.82%
Debt Instrument, Face Amount	$ 200.0
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2018 Class A-2 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 282.5
Debt Instrument, Interest Rate, Stated Percentage	4.62%
Debt Instrument, Face Amount	$ 282.5
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIHC 2018 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		75.4
Railcars Acquired \| Railcar	4,150
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 283.9
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2019 Secured Railcar Equipment Notes [Domain] [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 516.2
Debt Instrument, Interest Rate, Stated Percentage	3.82%
Debt Instrument, Face Amount	$ 528.3
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| Trinity Rail Leasing 2019 [Domain]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	386.5
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2019 Secured Railcar Equipment Notes Class A1 Notes [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 105.6
Debt Instrument, Interest Rate, Stated Percentage	2.39%
Debt Instrument, Face Amount	$ 106.9
Wholly Owned Subsidiaries [Member] \| Secured Debt [Member] \| 2019 Secured Railcar Equipment Notes Class A2 Notes [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 279.6
Debt Instrument, Interest Rate, Stated Percentage	3.10%
Debt Instrument, Face Amount	$ 279.6
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	3,104.6	2,336.3
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| 2006 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	109.3	133.4
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| 2009 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	147.8	159.7
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| 2010 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	248.5	257.0
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| 2018 Secured Railcar Equipment Notes [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	452.1	472.2
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| TRIHC 2018 Secured Railcar Equipment Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	265.4	279.0
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| 2019 Secured Railcar Equipment Notes [Domain] [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	901.0	0.0
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| Promissory Notes [Member] \| 2017 Secured Railcar Equipment Notes [Member] [Domain]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	627.1	660.2
Wholly Owned Subsidiaries [Member] \| Revolving Credit Facility [Member] \| Railcar Leasing and Management Services Group [Member] \| Line of Credit [Member] \| TILC Warehouse Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity Exclusive of Current Restrictions	396.6
TILC [Member] \| Revolving Credit Facility [Member] \| Railcar Leasing and Management Services Group [Member] \| Line of Credit [Member] \| TILC Warehouse Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750.0
Borrowings on Warehouse Loan Facility	663.1
Repayments on Warehouse Loan Facility	684.5
Long-term Line of Credit	$ 353.4	374.8
Debt Instrument, Interest Rate, Effective Percentage	3.32%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Class A-1a Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.37%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Class A-1b Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Class A-2 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 508.8
Debt Instrument, Interest Rate, Stated Percentage	6.02%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2014 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 335.7
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2014 Class A-1 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.86%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2014 Class A-2 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 220.7
Debt Instrument, Interest Rate, Stated Percentage	4.09%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2017-1 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 237.9
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2017-1 Class A-1 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 53.5
Debt Instrument, Interest Rate, Stated Percentage	2.71%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRIP Master Funding Series 2017-1 Class A-2 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 134.9
Debt Instrument, Interest Rate, Stated Percentage	3.74%
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 41.6
Debt Instrument, Interest Rate, Stated Percentage	2.27%
Debt Instrument, Face Amount	$ 145.4
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRL 2012 Series 2012-1 Class A-2 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 188.4
Debt Instrument, Interest Rate, Stated Percentage	3.53%
Debt Instrument, Face Amount	$ 188.4
Partially-Owned Subsidiaries [Member] \| Secured Debt [Member] \| TRL 2012 Series 2013-1 Notes [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 141.4
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Debt Instrument, Face Amount	$ 183.4
Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	$ 1,289.3	$ 1,327.9