Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Total revenues	$ 1,187.9	$ 1,626.7
Operating profit:
Total operating profit	203.4	333.1
Select expense information:
Depreciation	69.4	64.0
Interest	45.8	51.5
Operating Segments
Revenues:
Total revenues	1,556.4	1,983.4
Operating profit:
Total operating profit	292.2	407.0
Railcar Leasing and Management Services Group
Revenues:
Total revenues	177.8	244.2
Railcar Leasing and Management Services Group | Operating Segments
Revenues:
Total revenues	$ 178.5	244.8
Percent Change, Revenues	(27.10%)
Operating profit:
Total operating profit	$ 74.2	$ 122.8
Percent Change, Operating Profit	(39.60%)
Operating profit margin:
Total operating profit margin	41.60%	50.20%
Select expense information:
Depreciation	$ 37.4	$ 34.1
Percent Change, Depreciation	9.70%
Maintenance Costs	$ 31.6	19.9
Percent Change, Maintenance	58.80%
Rent	$ 9.5	11.8
Percent Change, Rent	(19.50%)
Interest	$ 31.8	37.9
Percent Change, Interest	(16.10%)
Railcar Leasing and Management Services Group | Operating Segments | Leasing and management
Revenues:
Total revenues	$ 170.5	166.1
Percent Change, Revenues	2.60%
Operating profit:
Total operating profit	$ 69.8	$ 82.3
Percent Change, Operating Profit	(15.20%)
Operating profit margin:
Total operating profit margin	40.90%	49.50%
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	$ 8.0	$ 78.7
Operating profit:
Total operating profit	2.3	25.6
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	$ 2.1	$ 14.9