Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financial Information from continuing operations for segments
Total revenues	$ 1,485.3	$ 1,066.1	$ 2,945.8	$ 1,999.0
Operating Profit (Loss)	302.0	183.4	693.3	342.9
Rail Group
Financial Information from continuing operations for segments
Total revenues	760.7	474.1	1,361.8	897.7
Operating Profit (Loss)	176.0	107.9	343.5	210.8
Construction Products Group
Financial Information from continuing operations for segments
Total revenues	149.9	149.3	262.1	247.3
Operating Profit (Loss)	22.4	19.0	44.1	26.7
Inland Barge Group
Financial Information from continuing operations for segments
Total revenues	165.4	150.0	302.3	297.4
Operating Profit (Loss)	30.9	20.9	57.6	45.2
Energy Equipment Group
Financial Information from continuing operations for segments
Total revenues	183.2	121.4	350.2	249.9
Operating Profit (Loss)	28.3	14.3	51.2	29.2
Railcar Leasing and Management Services Group
Financial Information from continuing operations for segments
Total revenues	225.4	169.6	667.6	304.0
Operating Profit (Loss)	102.4	75.7	332.7	137.3
All Other
Financial Information from continuing operations for segments
Total revenues	0.7	1.7	1.8	2.7
Operating Profit (Loss)	(2.6)	(3.8)	(8.0)	(6.4)
Segment Totals before Eliminations and Corporate Expenses
Financial Information from continuing operations for segments
Total revenues	1,485.3	1,066.1	2,945.8	1,999.0
Operating Profit (Loss)	357.4	234.0	821.1	442.8
Corporate
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Operating Profit (Loss)	(29.7)	(15.5)	(52.8)	(32.1)
Eliminations – Lease subsidiary
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Operating Profit (Loss)	(26.9)	(34.7)	(76.2)	(67.1)
Eliminations – Other
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Operating Profit (Loss)	1.2	(0.4)	1.2	(0.7)
Total
Financial Information from continuing operations for segments
Total revenues	1,485.3	1,066.1	2,945.8	1,999.0
Total | Rail Group
Financial Information from continuing operations for segments
Total revenues	895.6	668.0	1,753.0	1,293.5
Total | Construction Products Group
Financial Information from continuing operations for segments
Total revenues	151.7	154.5	264.8	258.3
Total | Inland Barge Group
Financial Information from continuing operations for segments
Total revenues	165.4	150.0	302.3	297.4
Total | Energy Equipment Group
Financial Information from continuing operations for segments
Total revenues	227.6	152.5	438.2	307.2
Total | Railcar Leasing and Management Services Group
Financial Information from continuing operations for segments
Total revenues	231.5	169.6	674.6	304.0
Operating Profit (Loss)	102.4	75.7	332.7	137.3
Total | All Other
Financial Information from continuing operations for segments
Total revenues	28.1	21.7	51.3	41.0
Total | Segment Totals before Eliminations and Corporate Expenses
Financial Information from continuing operations for segments
Total revenues	1,699.9	1,316.3	3,484.2	2,501.4
Total | Corporate
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Total | Eliminations – Lease subsidiary
Financial Information from continuing operations for segments
Total revenues	(128.6)	(189.5)	(377.7)	(387.5)
Total | Eliminations – Other
Financial Information from continuing operations for segments
Total revenues	(86.0)	(60.7)	(160.7)	(114.9)
Intersegment
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Intersegment | Rail Group
Financial Information from continuing operations for segments
Total revenues	134.9	193.9	391.2	395.8
Intersegment | Construction Products Group
Financial Information from continuing operations for segments
Total revenues	1.8	5.2	2.7	11.0
Intersegment | Inland Barge Group
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Intersegment | Energy Equipment Group
Financial Information from continuing operations for segments
Total revenues	44.4	31.1	88.0	57.3
Intersegment | Railcar Leasing and Management Services Group
Financial Information from continuing operations for segments
Total revenues	6.1	0	7.0	0
Intersegment | All Other
Financial Information from continuing operations for segments
Total revenues	27.4	20.0	49.5	38.3
Intersegment | Segment Totals before Eliminations and Corporate Expenses
Financial Information from continuing operations for segments
Total revenues	214.6	250.2	538.4	502.4
Intersegment | Corporate
Financial Information from continuing operations for segments
Total revenues	0	0	0	0
Intersegment | Eliminations – Lease subsidiary
Financial Information from continuing operations for segments
Total revenues	(128.6)	(189.5)	(377.7)	(387.5)
Intersegment | Eliminations – Other
Financial Information from continuing operations for segments
Total revenues	$ (86.0)	$ (60.7)	$ (160.7)	$ (114.9)