Consolidated Statements of Operations (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Total Revenues	$ 1,028.4	$ 708.3	$ 1,953.7	$ 1,342.5
Cost of revenues:
Total cost of revenues	821.4	568.9	1,577.9	1,069.2
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	56.0	47.5	109.9	97.8
Gains on disposition of property, plant, and equipment:
Net gains on railcar lease fleet sales	1.6	0.4	5.3	1.5
Other	2.3	3.1	6.1	3.9
Total operating profit	154.9	95.4	277.3	180.9
Other (income) expense:
Interest income	(0.3)	(0.4)	(0.7)	(0.7)
Interest expense	47.9	43.8	95.8	88.3
Other, net	0	(0.6)	(3.0)	(1.1)
Nonoperating (income) expense, total	47.6	42.8	92.1	86.5
Income before income taxes	107.3	52.6	185.2	94.4
Provision for income taxes	39.8	21.0	65.4	37.2
Net income	67.5	31.6	119.8	57.2
Net income (loss) attributable to noncontrolling interest	(0.3)	1.6	(0.9)	3.0
Net income attributable to Trinity Industries, Inc.	67.8	30.0	120.7	54.2
Net income attributable to Trinity Industries, Inc. per common share:
Basic	$ 0.84	$ 0.37	$ 1.50	$ 0.68
Diluted	$ 0.84	$ 0.37	$ 1.50	$ 0.67
Weighted average number of shares outstanding:
Basic	77.7	77.4	77.7	77.2
Diluted	77.9	77.7	77.9	77.5
Dividends declared per common share	$ 0.11	$ 0.09	$ 0.20	$ 0.17
Manufacturing
Revenues:
Total Revenues	836.1	580.1	1,619.3	1,094.5
Cost of revenues:
Total cost of revenues	694.9	498.2	1,366.9	929.9
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	39.1	33.4	75.6	67.4
Leasing
Revenues:
Total Revenues	192.3	128.2	334.4	248.0
Cost of revenues:
Total cost of revenues	112.1	63.3	185.5	123.8
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	7.3	5.6	13.4	11.3
Other
Cost of revenues:
Total cost of revenues	14.4	7.4	25.5	15.5
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 9.6	$ 8.5	$ 20.9	$ 19.1