Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Total revenues	$ 1,111.7	$ 1,542.2	$ 3,484.5	$ 4,845.7
Operating profit:
Total operating profit	183.6	364.9	578.6	1,080.9
Select expense information:
Depreciation			210.6	197.9
Interest	45.3	46.7	136.7	148.8
Operating Segments
Revenues:
Total revenues	1,401.6	1,960.8	4,472.2	5,940.4
Operating profit:
Total operating profit	247.3	471.3	811.5	1,341.9
Railcar Leasing and Management Services Group
Revenues:
Total revenues	173.2	246.6	647.1	722.2
Railcar Leasing and Management Services Group | Operating Segments
Revenues:
Total revenues	$ 173.7	249.2	$ 648.8	732.1
Percent Change, Revenues	(30.30%)		(11.40%)
Operating profit:
Total operating profit	$ 80.5	$ 158.2	$ 272.4	$ 418.7
Percent Change, Operating Profit	(49.10%)		(34.90%)
Operating profit margin:
Total operating profit margin	46.30%	63.50%	42.00%	57.20%
Select expense information:
Depreciation	$ 39.4	$ 35.9	$ 115.5	$ 105.8
Percent Change, Depreciation	9.70%		9.20%
Maintenance Costs	$ 21.3	24.6	$ 84.7	65.9
Percent Change, Maintenance	(13.40%)		28.50%
Rent	$ 9.9	9.9	$ 29.3	31.3
Percent Change, Rent	0.00%		(6.40%)
Interest	$ 31.2	32.5	$ 94.4	106.8
Percent Change, Interest	(4.00%)		(11.60%)
Railcar Leasing and Management Services Group | Operating Segments | Leasing and management
Revenues:
Total revenues	$ 173.7	176.6	$ 522.7	520.9
Percent Change, Revenues	(1.60%)		0.30%
Operating profit:
Total operating profit	$ 80.5	$ 81.8	$ 224.8	$ 254.7
Percent Change, Operating Profit	(1.60%)		(11.70%)
Operating profit margin:
Total operating profit margin	46.30%	46.30%	43.00%	48.90%
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	$ 0.0	$ 72.6	$ 126.1	$ 211.2
Operating profit:
Total operating profit	0.0	18.6	34.1	61.2
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	$ 0.0	$ 57.8	$ 13.5	$ 102.8