Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Total revenues	$ 130.4	$ 119.6	$ 260.2	$ 240.8
Percent Change	9.00%		8.10%
Operating Profit:
Total operating profit	59.7	49.2	114.4	97.4
Operating profit margin:
Total operating profit margin	45.80%	41.10%	44.00%	40.40%
Wholly Owned Subsidiaries [Member] | Leasing and management [Member]
Revenues:
Total revenues	92.9	86.0	183.2	170.1
Percent Change	8.00%		7.70%
Operating Profit:
Total operating profit	39.5	31.4	76.0	60.6
TRIP Holdings [Member] | Leasing and management [Member]
Revenues:
Total revenues	28.7	29.2	58.2	58.2
Percent Change	(1.70%)
Operating Profit:
Total operating profit	16.8	17.5	33.9	34.6
Leasing and management [Member]
Operating profit margin:
Total operating profit margin	46.30%	42.40%	45.50%	41.70%
Wholly Owned Subsidiaries [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues	8.8	3.7	10.7	11.6
Percent Change	137.80%		(7.80%)
Operating Profit:
Total operating profit	3.4	0.3	4.4	2.2
TRIP Holdings [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues		0.7	8.1	0.9
Operating Profit:
Total operating profit	0		0.1
Sales of cars from the lease fleet [Member]
Operating profit margin:
Total operating profit margin	38.60%	6.80%	23.90%	17.60%
TRIP Holdings [Member]
Revenues:
Total revenue of TRIP holdings	28.7	29.9	66.3	59.1
Percent Change	(4.00%)		12.20%
Operating Profit:
Total operating profit	16.8	17.5	34.0	34.6
Wholly Owned Subsidiaries [Member]
Revenues:
Total revenue of wholly-owned subsidiaries	101.7	89.7	193.9	181.7
Percent Change	13.40%		6.70%
Operating Profit:
Total operating profit	$ 42.9	$ 31.7	$ 80.4	$ 62.8