Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues:
Total revenues		$ 1,542.2	$ 1,562.8	$ 4,845.7	$ 4,508.6
Operating profit:
Total operating profit		364.9	281.2	1,080.9	974.5
Operating profit margin:
Depreciation				197.9	171.5
Interest		46.7	48.2	148.8	141.4
Railcar Leasing and Management Services Group
Revenues:
Total revenues		246.6	203.0	722.2	870.6
Operating segment
Revenues:
Total revenues		1,960.8	1,839.5	5,940.4	5,323.7
Operating profit:
Total operating profit		471.3	352.7	1,341.9	1,173.8
Operating segment | Railcar Leasing and Management Services Group
Revenues:
Total revenues		$ 249.2	205.7	$ 732.1	880.3
Percent Change		21.10%		(16.80%)
Operating profit:
Total operating profit		$ 158.2	$ 87.0	$ 418.7	$ 419.7
Percent Change		81.80%		(0.20%)
Operating profit margin:
Total operating profit margin		63.50%	42.30%	57.20%	47.70%
Depreciation	[1]	$ 35.9	$ 32.4	$ 105.8	$ 97.1
Percent Change, Depreciation	[1]	10.80%		9.00%
Maintenance Costs	[1]	$ 24.6	17.8	$ 65.9	58.8
Percent Change, Maintenance	[1]	38.20%		12.10%
Rent	[1]	$ 9.9	13.1	$ 31.3	39.7
Percent Change, Rent	[1]	(24.40%)		(21.20%)
Interest	[1]	$ 32.5	39.1	$ 106.8	114.5
Percent Change, Interest	[1]	(16.90%)		(6.70%)
Operating segment | Leasing and management | Railcar Leasing and Management Services Group
Revenues:
Total revenues		$ 176.6	158.3	$ 520.9	469.2
Percent Change		11.60%		11.00%
Operating profit:
Total operating profit		$ 81.8	$ 74.4	$ 254.7	$ 213.8
Percent Change		9.90%		19.10%
Operating profit margin:
Total operating profit margin		46.30%	47.00%	48.90%	45.60%
Operating segment | Railcars owned one year or less at the time of sale | Railcar Leasing and Management Services Group
Revenues:
Total revenues		$ 72.6	$ 47.4	$ 211.2	$ 411.1
Operating profit:
Total operating profit		18.6	9.6	61.2	115.7
Operating segment | Railcars owned more than one year at the time of sale | Railcar Leasing and Management Services Group
Operating profit:
Total operating profit		$ 57.8	$ 3.0	$ 102.8	$ 90.2

[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 profit 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.