Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Total revenues	$ 932.9	$ 896.2
Cost of revenues:
Total cost of revenues	711.1	730.2
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	69.0	50.7
Gains (losses) on disposition of property, plant, and equipment:
Net gains on railcar lease fleet sales	6.8	3.7
Other	(0.1)	3.7
Total gains (losses) on disposition of property, plant, and equipment	6.7	7.4
Total operating profit	159.5	122.7
Other (income) expense:
Interest income	(0.4)	(0.4)
Interest expense	49.2	47.9
Other, net	(2.7)	(2.9)
Other (income) expense, total	46.1	44.6
Income from continuing operations before income taxes	113.4	78.1
Provision for income taxes	41.2	25.7
Net income from continuing operations	72.2	52.4
Discontinued operations:
Gain on sale of discontinued operations, net of provision for income taxes of $5.4	7.0	0
Loss from discontinued operations, net of benefit for income taxes of $(0.3) and $(0.1)	(0.4)	(0.1)
Net income	78.8	52.3
Net loss attributable to noncontrolling interest	(0.3)	(0.6)
Net income attributable to Trinity Industries, Inc.	79.1	52.9
Net income attributable to Trinity Industries, Inc. per common share:
Basic, Continuing operations (in dollars per share)	$ 0.91	$ 0.66
Basic, Discontinued operations (in dollars per share)	$ 0.08	$ 0.00
Basic (in dollars per share)	$ 0.99	$ 0.66
Diluted, Continuing operations (in dollars per share)	$ 0.91	$ 0.66
Diluted, Discontinued operations (in dollars per share)	$ 0.08	$ 0.00
Diluted (in dollars per share)	$ 0.99	$ 0.66
Weighted average number of shares outstanding:
Basic (in shares)	76.9	77.8
Diluted (in shares)	77.0	78.1
Dividends declared per common share (in dollars per share)	$ 0.11	$ 0.09
Manufacturing
Revenues:
Total revenues	798.5	754.1
Cost of revenues:
Total cost of revenues	641.2	656.8
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	42.7	33.3
Leasing
Revenues:
Total revenues	134.4	142.1
Cost of revenues:
Total cost of revenues	69.9	73.4
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	9.7	6.1
Other
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 16.6	$ 11.3