Note 10. Employee Retirement Plans Employee Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Pension plan settlement	$ 0.0	$ 0.0	$ (151.5)
Defined Benefit Plan, Plan Assets, Amount			$ 23.6
Defined Contribution Plan, Employer Discretionary Contribution Amount	8.6
Defined Benefit Plan, Plan Assets, Administration Expense	0.2	2.5
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement		6.4
Assets for Plan Benefits, Defined Benefit Plan		16.6
Defined Benefit Plan, Plan Assets, Period Increase (Decrease)		(16.0)
Defined Benefit Plan, Excise Tax from Reversion of Surplus Plan Assets		3.2
Trinity Industries, Inc. Consolidated Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		0.6
Defined Contribution Plan, Employer Discretionary Contribution Amount		$ 10.9
Assets for Plan Benefits, Defined Benefit Plan	$ 0.4