Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Total revenues	$ 1,184.9	$ 1,676.8	$ 2,372.8	$ 3,303.5
Cost of revenues:
Total cost of revenues	897.7	1,219.6	1,787.6	2,430.7
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	106.7	114.4	203.2	212.7
Gains (losses) on dispositions of property:
Net gains on railcar lease fleet sales owned more than one year at the time of sale	11.4	30.1	13.5	45.0
Other	(0.3)	10.0	(0.5)	10.9
Total gains (losses) on disposition of property	11.1	40.1	13.0	55.9
Total operating profit	191.6	382.9	395.0	716.0
Other (income) expense:
Interest income	(1.3)	(0.5)	(2.5)	(1.0)
Interest expense	45.6	50.6	91.4	102.1
Other, net	(4.9)	(0.7)	(5.6)	(3.0)
Total other (income) expense	39.4	49.4	83.3	98.1
Income before income taxes	152.2	333.5	311.7	617.9
Provision for income taxes	53.4	112.7	110.8	208.1
Net income	98.8	220.8	200.9	409.8
Net income attributable to noncontrolling interest	4.2	8.8	9.1	17.6
Net income attributable to Trinity Industries, Inc.	$ 94.6	$ 212.0	$ 191.8	$ 392.2
Net income attributable to Trinity Industries, Inc. per common share:
Basic (in dollars per share)	$ 0.62	$ 1.36	$ 1.25	$ 2.52
Diluted (in dollars per share)	$ 0.62	$ 1.33	$ 1.25	$ 2.46
Weighted average number of shares outstanding:
Basic (in shares)	147.8	150.7	148.7	151.0
Diluted (in shares)	147.8	154.2	148.7	154.3
Dividends declared per common share (in dollars per share)	$ 0.11	$ 0.11	$ 0.22	$ 0.21
Manufacturing
Revenues:
Total revenues	$ 888.8	$ 1,445.4	$ 1,898.9	$ 2,827.9
Cost of revenues:
Total cost of revenues	719.1	1,101.8	1,513.0	2,186.3
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	60.3	69.4	121.7	130.7
Leasing
Revenues:
Total revenues	296.1	231.4	473.9	475.6
Cost of revenues:
Total cost of revenues	178.6	117.8	274.6	244.4
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	11.7	12.7	22.1	23.0
Other
Selling, engineering, and administrative expenses:
Total selling, engineering, and administrative expenses	$ 34.7	$ 32.3	$ 59.4	$ 59.0