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Debt - Components of debt (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt: | $ 5,867.0 | $ 5,754.2
Recourse |  |
Debt Instrument [Line Items] |  |
Debt: | 795.0 | 794.6
Nonrecourse |  |
Debt Instrument [Line Items] |  |
Debt: | 5,072.0 | 4,959.6
Level 2 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Fair Value | 807.3 | 812.1
Level 3 |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Fair Value | 3,174.1 | 3,192.7
Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 800.0 | 799.9
Less: unamortized debt issuance costs | 5.0 | 5.3
Senior Notes due 2024 | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Senior Notes | 400.0 | 399.9
Debt Instrument, Unamortized Discount | 0.0 | 0.1
Senior Notes due 2028 | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Senior Notes | 400.0 | 400.0
Wholly Owned Subsidiaries [Member] | Nonrecourse |  |
Debt Instrument [Line Items] |  |
Debt: | 3,946.0 | 3,819.2
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 3,962.0 | 3,836.5
Less: unamortized debt issuance costs | 16.0 | 17.3
Wholly Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] | Nonrecourse |  |
Debt Instrument [Line Items] |  |
Debt: | 3,946.0 | 3,819.2
Wholly Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 2,213.6 | 2,246.7
Debt Instrument, Unamortized Discount | 0.2 | 0.2
Wholly Owned Subsidiaries [Member] | 2017 Secured Railcar Equipment Notes [Member] [Domain] | Promissory Notes [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 663.1 | 673.7
Debt Instrument, Unamortized Discount | 3.0 | 3.5
Wholly Owned Subsidiaries [Member] | TRL-2023 Term Loan | Line of Credit [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Line of Credit | 331.7 | 334.5
Wholly Owned Subsidiaries [Member] | Other Equipment Financing | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Secured Debt, Other | 51.8 | 52.3
Partially-Owned Subsidiaries [Member] | Nonrecourse |  |
Debt Instrument [Line Items] |  |
Debt: | 1,126.0 | 1,140.4
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Less: unamortized debt issuance costs | 6.8 | 7.4
Partially-Owned Subsidiaries [Member] | Railcar Leasing and Services Group [Member] | Nonrecourse |  |
Debt Instrument [Line Items] |  |
Debt: | 1,126.0 | 1,140.4
Partially-Owned Subsidiaries [Member] | Secured Debt [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs | 1,132.8 | 1,147.8
Debt Instrument, Unamortized Discount | 0.1 | 0.1
Revolving Credit Facility [Member] | Line of Credit [Member] | Corporate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Line of Credit | 0.0 | 0.0
Revolving Credit Facility [Member] | TILC [Member] | TILC Warehouse Facility [Member] | Line of Credit [Member] | Railcar Leasing and Services Group [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Line of Credit | $ 701.8 | $ 529.3

X
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- Definition Line items represent financial concepts included in a table. 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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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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