Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 13.7	$ 1.9
Derivative financial instruments:
Unrealized gains arising during the period, net of tax expense of $0.1 and $4.4	0.5	14.7
Reclassification adjustments for (gains) losses included in net income, net of tax benefit of $11.0 and $0.9	(14.9)	2.5
Defined benefit plans:
Amortization of net actuarial losses, net of tax benefit of $—, and $—	0.0	0.1
Other Comprehensive Income (Loss), Net of Tax, Total	(14.4)	17.3
Comprehensive income (loss)	(0.7)	19.2
Less: comprehensive income attributable to noncontrolling interest	1.9	2.8
Comprehensive income (loss) attributable to Trinity Industries, Inc.	$ (2.6)	$ 16.4