Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Total revenues	$ 877.3	$ 1,187.9
Operating profit:
Total operating profit	116.6	203.4
Select expense information:
Depreciation	72.8	69.4
Interest	45.0	45.8
Operating Segments
Revenues:
Total revenues	1,121.2	1,556.4
Operating profit:
Total operating profit	182.9	292.2
Railcar Leasing and Management Services Group
Revenues:
Total revenues	178.6	177.8
Railcar Leasing and Management Services Group | Operating Segments
Revenues:
Total revenues	$ 178.9	178.5
Percent Change, Revenues	0.20%
Operating profit:
Total operating profit	$ 85.0	$ 74.2
Percent Change, Operating Profit	14.60%
Operating profit margin:
Total operating profit margin	47.50%	41.60%
Select expense information:
Depreciation	$ 42.1	$ 37.4
Percent Change, Depreciation	12.60%
Maintenance Costs	$ 20.5	31.6
Percent Change, Maintenance	(35.10%)
Rent	$ 10.1	9.5
Percent Change, Rent	6.30%
Interest	$ 30.6	31.8
Percent Change, Interest	(3.80%)
Railcar Leasing and Management Services Group | Operating Segments | Leasing and management
Revenues:
Total revenues	$ 178.9	170.5
Percent Change, Revenues	4.90%
Operating profit:
Total operating profit	$ 85.0	$ 69.8
Percent Change, Operating Profit	21.80%
Operating profit margin:
Total operating profit margin	47.50%	40.90%
Railcar Leasing and Management Services Group | Operating Segments | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	$ 0.0	$ 8.0
Operating profit:
Total operating profit	0.0	2.3
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	$ 2.1