Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenues:
Total revenues	$ 1,626.7		$ 1,460.5
Operating profit:
Total operating profit	333.1		391.3
Selected expense information:
Depreciation	64.0		55.3
Interest:
Interest expense	51.5		46.3
Railcar Leasing and Management Services Group
Revenues:
Total revenues	244.2		442.2
Operating profit:
Total operating profit	122.8		230.3
Operating profit margin:
Total operating profit margin	50.20%		52.00%
Selected expense information:
Depreciation	34.1	[1]	32.5	[1]
Percent Change, Depreciation	4.90%	[1]
Maintenance	19.9	[1]	21.0	[1]
Percent Change, Maintenance	(5.20%)	[1]
Rent	11.8	[1]	13.3	[1]
Percent Change, Rent	(11.30%)	[1]
Railcar Leasing and Management Services Group | Leasing and management
Revenues:
Total revenues	166.1		150.2
Percent Change	10.60%
Operating profit:
Total operating profit	82.3		63.9
Percentage Change	28.80%
Operating profit margin:
Total operating profit margin	49.50%		42.50%
Railcar Leasing and Management Services Group | Railcars owned one year or less at the time of sale
Revenues:
Total revenues	78.7		292.9
Operating profit:
Total operating profit	25.6		88.9
Railcar Leasing and Management Services Group | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit	14.9		77.5
Rail Group
Revenues:
Total revenues	875.4		601.1
Operating profit:
Total operating profit	212.7		167.5
Total
Revenues:
Total revenues	1,626.7		1,460.5
Total | Railcar Leasing and Management Services Group
Revenues:
Total revenues	244.8		443.1
Percent Change	(44.80%)
Operating profit:
Total operating profit	122.8		230.3
Percentage Change	(46.70%)
Interest:
Interest expense	37.9	[1]	37.3	[1]
Percent Change, Total interest expense	1.60%	[1]
Total | Rail Group
Revenues:
Total revenues	$ 1,144.5		$ 857.4

[1] Depreciation, maintenance, and rent expense are components of operating profit. Amortization of deferred profit on railcars sold from the Rail Group to the Leasing Group is included in the operating profits of the Leasing Group resulting in the recognition of depreciation expense based on the Company's original manufacturing cost of the railcars. Interest expense is not a component of operating profit and includes the effect of hedges.