Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income	$ 157.1	$ 126.6	$ 72.9
Unrealized gains (losses) arising during the period, net of tax benefit (expense) of $1.1, $(3.3), and $(9.2)	(3.5)	10.6	29.3
Reclassification adjustments for (gains) losses included in net income, net of tax (expense) benefit of $(3.7), $7.4, and $0.8	(11.5)	(26.1)	3.5
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $—, $(0.1), and $0.5	0.1	(0.3)	2.1
Amortization of net actuarial losses, net of tax benefit of $—, $—, and $0.1	0.1	0.1	0.2
Reclassification adjustments for losses included in discontinued operations, net of tax benefit of $—, $—, and $—	0.0	0.0	(1.3)
Other comprehensive income (loss):	(14.8)	(15.7)	36.4
Comprehensive income	142.3	110.9	109.3
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	19.1	13.6	12.5
Comprehensive income attributable to Trinity Industries, Inc.	$ 123.2	$ 97.3	$ 96.8