Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Total revenues	$ 937.5	$ 791.1	$ 2,891.2	$ 2,133.6
Cost of revenues:
Total cost of revenues	755.6	634.1	2,333.5	1,703.3
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	58.5	53.5	168.4	151.3
Gains on disposition of property, plant, and equipment:
Net gains on railcar lease fleet sales	17.0	1.6	22.3	3.1
Other	1.5	0.3	7.6	4.2
Total operating profit	141.9	105.4	419.2	286.3
Other (income) expense:
Interest income	(0.4)	(0.5)	(1.1)	(1.2)
Interest expense	47.8	47.9	143.6	136.2
Other, net	(1.4)	5.3	(4.4)	4.2
Other (income) expense, total	46.0	52.7	138.1	139.2
Income before income taxes	95.9	52.7	281.1	147.1
Provision for income taxes	32.8	21.1	98.2	58.3
Net income	63.1	31.6	182.9	88.8
Net income (loss) attributable to noncontrolling interest	(0.1)	(0.3)	(1.0)	2.7
Net income attributable to Trinity Industries, Inc.	63.2	31.9	183.9	86.1
Net income attributable to Trinity Industries, Inc. per common share:
Basic	$ 0.80	$ 0.40	$ 2.30	$ 1.07
Diluted	$ 0.80	$ 0.40	$ 2.29	$ 1.07
Weighted average number of shares outstanding:
Basic	76.5	77.7	77.3	77.4
Diluted	76.7	77.9	77.5	77.7
Dividends declared per common share	$ 0.11	$ 0.09	$ 0.31	$ 0.26
Manufacturing
Revenues:
Total revenues	778.2	643.7	2,397.5	1,738.2
Cost of revenues:
Total cost of revenues	658.2	548.4	2,025.1	1,478.3
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	38.6	35.8	114.2	103.2
Leasing
Revenues:
Total revenues	159.3	147.4	493.7	395.4
Cost of revenues:
Total cost of revenues	84.3	78.6	269.8	202.4
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	7.5	6.2	20.9	17.5
Other
Cost of revenues:
Total cost of revenues	13.1	7.1	38.6	22.6
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 12.4	$ 11.5	$ 33.3	$ 30.6