Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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

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

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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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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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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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Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

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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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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

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Debt - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Debt - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Oct. 28, 2025	Apr. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ 0.8	$ 1.5
Corporate Segment [Member] \| Senior Notes due 2028 \| 7.75% Senior Notes Due 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.75%
Corporate Segment [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 600.0
Proceeds from Lines of Credit		230.0
Repayments of Lines of Credit		140.0
Line of Credit Facility, Remaining Borrowing Capacity		$ 502.7
Debt Instrument, Basis Spread on Variable Rate		1.50%
Debt Instrument, Interest Rate, Effective Percentage		5.78%
Line of Credit Facility, Interest Rate at Period End		0.20%
Long-term Line of Credit		$ 90.0					$ 0.0
Corporate Segment [Member] \| Letter of Credit [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		7.3
TILC [Member] \| Leasing & Services \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| TILC Warehouse Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		800.0
Proceeds from Lines of Credit		329.5
Repayments of Lines of Credit		116.5
Line of Credit Facility, Remaining Borrowing Capacity		$ 2.4
Debt Instrument, Basis Spread on Variable Rate		1.75%
Debt Instrument, Interest Rate, Effective Percentage		6.03%
Long-term Line of Credit		$ 797.6					584.6
Repayments of Debt		$ 75.8
TILC [Member] \| Leasing & Services \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| TILC Warehouse Facility [Member] \| Subsequent Event
Debt Instrument [Line Items]
Repayments of Debt	$ 259.0
Wholly-owned subsidiaries \| Leasing & Services \| 2010 Secured Railcar Equipment Notes \| Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.19%
Repayments of Debt	$ 133.8
Wholly-owned subsidiaries \| Leasing & Services \| Line of Credit [Member] \| TRL-2023 Term Loan
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Long-term Line of Credit		$ 1,038.4			$ 1,050.0	$ 320.7	$ 323.4
Payments of Debt Issuance Costs		$ 5.6
Wholly-owned subsidiaries \| Leasing & Services \| Promissory Notes [Member] \| 2017 Secured Railcar Equipment Notes [Member] [Domain]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Repayments of Debt		$ 616.0
Loss on extinguishment of debt		$ 0.8
Wholly-owned subsidiaries \| Leasing & Services \| Secured Debt [Member] \| TRL-2025 Secured Railcar Equipment Notes \| Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.09%
Debt Instrument, Face Amount				$ 498.6
Wholly-owned subsidiaries \| Leasing & Services \| Secured Debt [Member] \| TRL-2025 Class B Secured Railcar Equipment Notes \| Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.30%
Debt Instrument, Face Amount				$ 36.6
Minimum \| Corporate Segment [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End		0.175%
Maximum \| Corporate Segment [Member] \| Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End		0.40%