Note 3. Derivative Instruments and Fair Value Measurements Derivatives - Interest Rate Hedges (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total stockholders' equity		$ 1,275.5	$ 1,269.6	$ 1,296.8	$ 2,016.0
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Derivative, Notional Amount		$ 249.3
Derivative, Average Fixed Interest Rate	[1]	4.41%
Derivative Asset		$ 0.0
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Derivative, Notional Amount	[2]	$ 788.5
Derivative, Average Fixed Interest Rate	[1],[2]	3.60%
Derivative Asset	[2]	$ 0.0
Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes
Derivative [Line Items]
Derivative, Notional Amount		$ 256.0
Derivative, Average Fixed Interest Rate	[1]	2.86%
Derivative Asset		$ 0.0
Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 169.3
Derivative, Cap Interest Rate		3.00%
Derivative Asset		$ 0.0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 408.1
Derivative, Average Fixed Interest Rate	[1]	2.31%
Derivative Asset		$ 13.1
Designated as Hedging Instrument [Member] | TRL-2023 Term Loan
Derivative [Line Items]
Derivative, Notional Amount	[3]	$ 267.6
Derivative, Average Fixed Interest Rate	[1],[3]	3.79%
Derivative Liability	[3]	$ (2.5)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Total stockholders' equity		0.2
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Total stockholders' equity	[2]	0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes
Derivative [Line Items]
Total stockholders' equity		0.4
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Total stockholders' equity		(0.2)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total stockholders' equity		(12.5)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Designated as Hedging Instrument [Member] | TRL-2023 Term Loan
Derivative [Line Items]
Total stockholders' equity	[3]	2.7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, 2018 Secured Railcar Equipment Notes [Domain]
Derivative [Line Items]
Total stockholders' equity		0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, TRIP Holdings Warehouse Loan [Member]
Derivative [Line Items]
Total stockholders' equity	[2]	0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap, Expired, Tribute Rail Secured Railcar Equipment Notes
Derivative [Line Items]
Total stockholders' equity		0.6
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Total stockholders' equity		0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Total stockholders' equity		0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | Designated as Hedging Instrument [Member] | TRL-2023 Term Loan
Derivative [Line Items]
Total stockholders' equity	[3]	$ 0.0

[1] Weighted average fixed interest rate, except for the interest rate cap on the 2017 promissory notes.

[2] As of March 31, 2023, all amounts previously recorded in AOCI related to this hedge have been fully amortized.

[3] (3) In June 2023, Trinity Rail Leasing 2023 LLC (“TRL-2023”), a limited purpose, indirect wholly-owned subsidiary of the Company owned through Trinity Industries Leasing Company ("TILC"), executed and designated a new interest rate swap derivative as a cash flow hedge to fix the Secured Overnight Financing Rate ("SOFR") component of the interest rate on a portion of the outstanding TRL-2023 term loan agreement ("TRL-2023 term loan").