Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 78.8	$ 52.3
Unrealized gain (loss) on derivative financial instruments:
Unrealized gain (loss) arising during the period, net of tax expense of $0.5 and $1.1	(0.7)	1.6
Reclassification adjustments for losses included in net income, net of tax expense of $2.8 and $1.0	4.6	1.3
Net actuarial gains (losses) of defined benefit plans:
Amortization of net actuarial loss, net of tax expense of $0.5 and $0.3	0.7	0.6
Other comprehensive income (loss), net of tax	4.6	3.5
Comprehensive income	83.4	55.8
Less: comprehensive income (loss) attributable to noncontrolling interest	0.4	(0.1)
Comprehensive income attributable to Trinity Industries, Inc.	$ 83.0	$ 55.9