Railcar Leasing and Management Services Group (Details 1) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues:
Total revenues		$ 1,676.8	$ 1,485.3	$ 3,303.5	$ 2,945.8
Operating profit:
Total operating profit		382.9	302.0	716.0	693.3
Selected expense information:
Depreciation				130.4	111.0
Interest:
Interest expense		50.6	46.9	102.1	93.2
Railcar Leasing and Management Services Group
Revenues:
Total revenues		$ 231.4	$ 225.4	$ 475.6	$ 667.6
Operating profit margin:
Total operating profit margin		57.80%	44.20%	53.90%	49.30%
Selected expense information:
Depreciation	[1]	$ 35.8	$ 32.2	$ 69.9	$ 64.7
Percent Change, Depreciation	[1]	11.20%		8.00%
Maintenance	[1]	$ 21.4	20.0	$ 41.3	41.0
Percent Change, Maintenance	[1]	7.00%		0.70%
Rent	[1]	$ 9.6	13.3	$ 21.4	26.6
Percent Change, Rent	[1]	(27.80%)		(19.50%)
Interest:
Interest expense	[1]	$ 36.4	38.1	$ 74.3	75.4
Percent Change, Total interest expense	[1]	(4.50%)		(1.50%)
Railcar Leasing and Management Services Group | Leasing and management
Revenues:
Total revenues		$ 178.2	160.7	$ 344.3	310.9
Percent Change		10.90%		10.70%
Operating profit:
Total operating profit		$ 90.6	$ 75.5	$ 172.9	$ 139.4
Percentage Change		20.00%		24.00%
Operating profit margin:
Total operating profit margin		50.80%	47.00%	50.20%	44.80%
Railcar Leasing and Management Services Group | Railcars owned one year or less at the time of sale
Revenues:
Total revenues		$ 59.9	$ 70.8	$ 138.6	$ 363.7
Operating profit:
Total operating profit		17.0	17.2	42.6	106.1
Railcar Leasing and Management Services Group | Railcars owned more than one year at the time of sale
Operating profit:
Total operating profit		30.1	9.7	45.0	87.2
Total
Revenues:
Total revenues		1,996.2	1,699.9	3,979.6	3,484.2
Operating profit:
Total operating profit		463.6	357.4	870.6	821.1
Total | Railcar Leasing and Management Services Group
Revenues:
Total revenues		$ 238.1	231.5	$ 482.9	674.6
Percent Change		2.90%		(28.40%)
Operating profit:
Total operating profit		$ 137.7	$ 102.4	$ 260.5	$ 332.7
Percentage Change		34.50%		(21.70%)

[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.