Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Total revenues	$ 1,184.9	$ 1,676.8	$ 2,372.8	$ 3,303.5
Operating profit:
Total operating profit	191.6	382.9	395.0	716.0
Select expense information:
Depreciation			139.9	130.4
Interest	45.6	50.6	91.4	102.1
Operating Segments
Revenues:
Total revenues	1,514.2	1,996.2	3,070.6	3,979.6
Operating profit:
Total operating profit	272.0	463.6	564.2	870.6
Railcar Leasing and Management Services Group
Revenues:
Total revenues	296.1	231.4	473.9	475.6
Railcar Leasing and Management Services Group | Operating Segments
Revenues:
Total revenues	$ 296.6	238.1	$ 475.1	482.9
Percent Change, Revenues	24.60%		(1.60%)
Operating profit:
Total operating profit	$ 117.7	$ 137.7	$ 191.9	$ 260.5
Percent Change, Operating Profit	(14.50%)		(26.30%)
Operating profit margin:
Total operating profit margin	39.70%	57.80%	40.40%	53.90%
Select expense information:
Depreciation	$ 38.7	$ 35.8	$ 76.1	$ 69.9
Percent Change, Depreciation	8.10%		8.90%
Maintenance Costs	$ 31.8	21.4	$ 63.4	41.3
Percent Change, Maintenance	48.60%		53.50%
Rent	$ 9.9	9.6	$ 19.4	21.4
Percent Change, Rent	3.10%		(9.30%)
Interest	$ 31.4	36.4	$ 63.2	74.3
Percent Change, Interest	(13.70%)		(14.90%)
Railcar Leasing and Management Services Group | Operating Segments | Leasing and management
Revenues:
Total revenues	$ 178.5	178.2	$ 349.0	344.3
Percent Change, Revenues	0.20%		1.40%
Operating profit:
Total operating profit	$ 74.5	$ 90.6	$ 144.3	$ 172.9
Percent Change, Operating Profit	(17.80%)		(16.50%)
Operating profit margin:
Total operating profit margin	41.70%	50.80%	41.30%	50.20%
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	$ 118.1	$ 59.9	$ 126.1	$ 138.6
Operating profit:
Total operating profit	31.8	17.0	34.1	42.6
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	$ 11.4	$ 30.1	$ 13.5	$ 45.0