Note 8. Debt Components and Fair Value of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt and Lease Obligation	$ 624.1	$ 398.7
Debt:	5,607.6	5,170.6
Long-term Debt, Fair Value	5,244.3	5,281.9
Nonrecourse
Debt Instrument [Line Items]
Long-Term Debt, Non-recourse	4,983.5	4,771.9
Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	624.9	399.9
Unamortized Debt Issuance Expense	0.8	1.2
Long-term Debt, Fair Value	612.5	420.8
Wholly Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Non-recourse	3,800.7	3,555.8
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	21.1	23.7
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	3,821.8	3,579.5
Long-term Debt, Fair Value	3,607.5	3,641.6
Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| Nonrecourse
Debt Instrument [Line Items]
Long-Term Debt, Non-recourse	3,800.7	3,555.8
Partially-Owned Subsidiaries [Member]
Debt Instrument [Line Items]
Long-Term Debt, Non-recourse	1,182.8	1,216.1
Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	9.8	11.1
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	1,192.6	1,227.2
Long-term Debt, Fair Value	1,024.3	1,219.5
Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member] \| Nonrecourse
Debt Instrument [Line Items]
Long-Term Debt, Non-recourse	1,182.8	1,216.1
2009 Secured Railcar Equipment Notes [Member] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	115.8	128.5
Long-term Debt, Fair Value	116.6	144.9
2010 Secured Railcar Equipment Notes [Member] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Non-Recourse Debt, Gross	204.1	220.6
Long-term Debt, Fair Value	197.1	234.6
2018 Secured Railcar Equipment Notes [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(0.1)	(0.1)
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	398.9	416.5
Long-term Debt, Fair Value	360.9	423.3
2019 Secured Railcar Equipment Notes [Domain] [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(0.2)	(0.3)
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	786.0	822.8
Long-term Debt, Fair Value	716.9	847.3
2020 Secured Railcar Equipment Notes [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.0	(0.1)
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	330.4	348.8
Long-term Debt, Fair Value	284.6	349.9
2021 Secured Railcar Equipment Notes [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.0	0.0
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	307.7	320.3
Long-term Debt, Fair Value	253.9	319.6
2022 Secured Railcar Equipment Notes [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.0	0.0
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	241.1	0.0
Long-term Debt, Fair Value	239.7	0.0
TRL 2012 Secured Railcar Equipment Notes - RIV 2013 [Member] \| Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	0.0	(0.1)
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	347.0	352.2
Long-term Debt, Fair Value	291.8	347.7
TRIP Master Funding Secured Railcar Equipment Notes [Member] \| Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(0.2)	(0.2)
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	523.0	551.3
Long-term Debt, Fair Value	451.4	548.1
Tribute Secured Railcar Equipment Notes \| Partially-Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(0.1)	0.0
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	322.6	0.0
Long-term Debt, Fair Value	281.1	0.0
Line of Credit [Member] \| TRIP Railcar Co Term Loan \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	0.0	323.7
Long-term Debt, Fair Value	0.0	323.7
Senior Notes [Member] \| Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	399.9	399.9
Debt Instrument, Unamortized Discount	(0.1)	(0.1)
Long-term Debt, Fair Value	387.5	420.8
Promissory Notes [Member] \| 2017 Secured Railcar Equipment Notes [Member] [Domain] \| Wholly Owned Subsidiaries [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount	(5.6)	(7.8)
Non-Recourse Debt, Gross	721.6
Non-Recourse Debt, Gross of Issuance Cost, Net of Discount	716.0	760.2
Long-term Debt, Fair Value	716.0	760.2
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Corporate Segment [Member]
Debt Instrument [Line Items]
Long-term Debt, Net of Unamortized Discount, Gross of Unamortized Debt Issuance Costs	225.0	0.0
Long-term Debt, Fair Value	225.0	0.0
Revolving Credit Facility [Member] \| Line of Credit [Member] \| TILC Warehouse Facility [Member] \| TILC [Member] \| Railcar Leasing and Management Services Group [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	721.8	561.8
Long-term Debt, Fair Value	$ 721.8	$ 561.8

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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Recourse And Non-Recourse Debt And Capital Lease Obligations

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Amount of short-term and long-term debt and lease obligation.

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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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Amount, after accumulated amortization, of debt discount.

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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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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.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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