Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total revenues	$ 877.3	$ 1,187.9
Operating Profit (Loss)	116.6	203.4
Intersegment
Segment Reporting Information [Line Items]
Total revenues	243.9	368.5
Intersegment | Eliminations – Lease subsidiary
Segment Reporting Information [Line Items]
Total revenues	(181.0)	(283.3)
Operating Profit (Loss)	(28.9)	(65.5)
Intersegment | Eliminations – Other
Segment Reporting Information [Line Items]
Total revenues	(62.9)	(85.2)
Operating Profit (Loss)	(2.4)	1.4
Total
Segment Reporting Information [Line Items]
Total revenues	1,121.2	1,556.4
Operating Profit (Loss)	182.9	292.2
Corporate
Segment Reporting Information [Line Items]
Operating Profit (Loss)	(35.0)	(24.7)
Rail Group
Segment Reporting Information [Line Items]
Total revenues	286.0	543.2
Rail Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	192.3	303.7
Rail Group | Total
Segment Reporting Information [Line Items]
Total revenues	478.3	846.9
Operating Profit (Loss)	50.7	157.2
Construction Products Group
Segment Reporting Information [Line Items]
Total revenues	120.9	121.6
Construction Products Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	2.2	3.3
Construction Products Group | Total
Segment Reporting Information [Line Items]
Total revenues	123.1	124.9
Operating Profit (Loss)	15.6	15.9
Inland Barge Group
Segment Reporting Information [Line Items]
Total revenues	62.7	110.8
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	62.7	110.8
Operating Profit (Loss)	6.4	12.6
Energy Equipment Group
Segment Reporting Information [Line Items]
Total revenues	227.8	232.5
Energy Equipment Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	27.6	40.9
Energy Equipment Group | Total
Segment Reporting Information [Line Items]
Total revenues	255.4	273.4
Operating Profit (Loss)	29.8	37.4
Railcar Leasing and Management Services Group
Segment Reporting Information [Line Items]
Total revenues	178.6	177.8
Railcar Leasing and Management Services Group | Intersegment
Segment Reporting Information [Line Items]
Total revenues	0.3	0.7
Railcar Leasing and Management Services Group | Total
Segment Reporting Information [Line Items]
Total revenues	178.9	178.5
Operating Profit (Loss)	85.0	74.2
All Other
Segment Reporting Information [Line Items]
Total revenues	1.3	2.0
All Other | Intersegment
Segment Reporting Information [Line Items]
Total revenues	21.5	19.9
All Other | Total
Segment Reporting Information [Line Items]
Total revenues	22.8	21.9
Operating Profit (Loss)	$ (4.6)	$ (5.1)