Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating Profit:
Total operating profit	$ 154.9	$ 95.4	$ 277.3	$ 180.9
Interest and rent expense:
Total interest expense	47.9	43.8	95.8	88.3
Leasing Group [Member]
Revenues:
Total revenues	194.2	128.2	336.5	248.0
Percent Change	51.50%		35.70%
Operating Profit:
Total operating profit	76.4	59.7	142.9	114.4
Operating profit margin:
Total operating profit margin	39.30%	46.60%	42.50%	46.10%
Interest and rent expense:
Rent expense	12.8	12.2	25.5	24.3
Total interest expense	42.5	36.2	85.6	72.9
Leasing Group [Member] | Leasing and management [Member]
Operating profit margin:
Total operating profit margin	46.40%	46.30%	46.70%	45.50%
Leasing Group [Member] | Wholly Owned Subsidiaries [Member]
Revenues:
Total revenues	164.4	99.5	277.6	189.8
Percent Change	65.20%		46.30%
Operating Profit:
Total operating profit	59.1	42.9	109.2	80.4
Interest and rent expense:
Total interest expense	24.3	25.4	48.9	50.6
Leasing Group [Member] | Wholly Owned Subsidiaries [Member] | Leasing and management [Member]
Revenues:
Total revenues	102.2	92.9	200.5	183.2
Percent Change	10.00%		9.40%
Operating Profit:
Total operating profit	44.0	39.5	87.1	76.0
Leasing Group [Member] | Wholly Owned Subsidiaries [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues	62.2	6.6	77.1	6.6
Leasing Group [Member] | Wholly Owned Subsidiaries [Member] | Railcar Owned One Year or Less [Member]
Operating Profit:
Total operating profit	13.5	3.0	16.4	3.0
Leasing Group [Member] | Wholly Owned Subsidiaries [Member] | Railcar Owned Greater than One Year [Member]
Operating Profit:
Total operating profit	1.6	0.4	5.7	1.4
Leasing Group [Member] | TRIP Holdings [Member]
Revenues:
Total revenues	29.8	28.7	58.9	58.2
Percent Change	3.80%		1.20%
Operating Profit:
Total operating profit	17.3	16.8	33.7	34.0
Interest and rent expense:
Interest expense external	15.0	10.8	30.2	22.3
Interest expense intercompany	3.2		6.5
Total interest expense	18.2	10.8	36.7	22.3
Leasing Group [Member] | TRIP Holdings [Member] | Leasing and management [Member]
Revenues:
Total revenues	29.8	28.7	58.9	58.2
Percent Change	3.80%		1.20%
Operating Profit:
Total operating profit	17.3	16.8	34.1	33.9
Leasing Group [Member] | TRIP Holdings [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues
Percent Change
Leasing Group [Member] | TRIP Holdings [Member] | Railcar Owned One Year or Less [Member]
Operating Profit:
Total operating profit
Leasing Group [Member] | TRIP Holdings [Member] | Railcar Owned Greater than One Year [Member]
Operating Profit:
Total operating profit			$ (0.4)	$ 0.1