Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Total revenues	$ 905.5	$ 1,184.9	$ 1,782.8	$ 2,372.8
Operating profit:
Total operating profit	135.2	191.6	251.8	395.0
Select expense information:
Depreciation			146.5	139.9
Interest	45.7	45.6	90.7	91.4
Operating Segments
Revenues:
Total revenues	1,084.0	1,514.2	2,205.2	3,070.6
Operating profit:
Total operating profit	189.2	272.0	372.1	564.2
Railcar Leasing and Management Services Group
Revenues:
Total revenues	191.9	296.1	370.5	473.9
Railcar Leasing and Management Services Group | Operating Segments
Revenues:
Total revenues	$ 192.1	296.6	$ 371.0	475.1
Percent Change, Revenues	(35.20%)		(21.90%)
Operating profit:
Total operating profit	$ 110.8	$ 117.7	$ 195.8	$ 191.9
Percent Change, Operating Profit	(5.90%)		2.00%
Operating profit margin:
Total operating profit margin	57.70%	39.70%	52.80%	40.40%
Select expense information:
Depreciation	$ 43.1	$ 38.7	$ 85.2	$ 76.1
Percent Change, Depreciation	11.40%		12.00%
Maintenance Costs	$ 23.9	31.8	$ 44.4	63.4
Percent Change, Maintenance	(24.80%)		(30.00%)
Rent	$ 9.9	9.9	$ 20.0	19.4
Percent Change, Rent	0.00%		3.10%
Interest	$ 31.3	31.4	$ 61.9	63.2
Percent Change, Interest	(0.30%)		(2.10%)
Railcar Leasing and Management Services Group | Operating Segments | Leasing and management
Revenues:
Total revenues	$ 185.0	178.5	$ 363.9	349.0
Percent Change, Revenues	3.60%		4.30%
Operating profit:
Total operating profit	$ 85.6	$ 74.5	$ 170.6	$ 144.3
Percent Change, Operating Profit	14.90%		18.20%
Operating profit margin:
Total operating profit margin	46.30%	41.70%	46.90%	41.30%
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	$ 7.1	$ 118.1	$ 7.1	$ 126.1
Operating profit:
Total operating profit	1.5	31.8	1.5	34.1
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	$ 23.7	$ 11.4	$ 23.7	$ 13.5