Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 1,187.9	$ 1,626.7
Operating Profit (Loss)	203.4	333.1
Intersegment
Segment Reporting Information [Line Items]
Total revenues	368.5	356.7
Total
Segment Reporting Information [Line Items]
Total revenues	1,556.4	1,983.4
Operating Profit (Loss)	292.2	407.0
Corporate
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(24.7)	(26.7)
Eliminations – Lease subsidiary
Segment Reporting Information [Line Items]
Total revenues	(283.3)	(259.0)
Operating Profit (Loss)	(65.5)	(48.3)
Eliminations – Other
Segment Reporting Information [Line Items]
Total revenues	(85.2)	(97.7)
Operating Profit (Loss)	1.4	1.1
Rail Group
Segment Reporting Information [Line Items]
Total revenues	543.2	875.4
Rail Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	303.7	269.1
Rail Group | Total
Segment Reporting Information [Line Items]
Total revenues	846.9	1,144.5
Operating Profit (Loss)	157.2	212.7
Construction Products Group
Segment Reporting Information [Line Items]
Total revenues	121.6	111.4
Construction Products Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	3.3	1.4
Construction Products Group | Total
Segment Reporting Information [Line Items]
Total revenues	124.9	112.8
Operating Profit (Loss)	15.9	8.3
Inland Barge Group
Segment Reporting Information [Line Items]
Total revenues	110.8	153.1
Inland Barge Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	0.0	0.0
Inland Barge Group | Total
Segment Reporting Information [Line Items]
Total revenues	110.8	153.1
Operating Profit (Loss)	12.6	27.5
Energy Equipment Group
Segment Reporting Information [Line Items]
Total revenues	232.5	241.5
Energy Equipment Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	40.9	58.6
Energy Equipment Group | Total
Segment Reporting Information [Line Items]
Total revenues	273.4	300.1
Operating Profit (Loss)	37.4	37.2
Railcar Leasing and Management Services Group
Segment Reporting Information [Line Items]
Total revenues	177.8	244.2
Railcar Leasing and Management Services Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	0.7	0.6
Railcar Leasing and Management Services Group | Total
Segment Reporting Information [Line Items]
Total revenues	178.5	244.8
Operating Profit (Loss)	74.2	122.8
All Other
Segment Reporting Information [Line Items]
Total revenues	2.0	1.1
All Other | Intersegment
Segment Reporting Information [Line Items]
Total revenues	19.9	27.0
All Other | Total
Segment Reporting Information [Line Items]
Total revenues	21.9	28.1
Operating Profit (Loss)	$ (5.1)	$ (1.5)