Railcar Leasing and Management Services Group (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Total revenues	$ 153.1	$ 122.1	$ 413.3	$ 362.9
Operating Profit:
Total operating profit	105.4	91.9	286.3	222.8
Interest and rent expense:
Interest expense	47.9	45.3	136.2	136.3
TRIP Holdings [Member] | Leasing Group [Member]
Revenues:
Total revenues	29.6	28.8	95.9	87.9
Percent Change	2.80%		9.10%
Operating Profit:
Total operating profit	17.4	16.3	51.4	50.9
Interest and rent expense:
Interest expense	18.5	11.7	40.8	35.3
TRIP Holdings [Member] | Leasing Group [Member] | Leasing and management [Member]
Revenues:
Total revenues	29.2	28.8	87.4	87.0
Percent Change	1.40%		0.50%
Operating Profit:
Total operating profit	17.4	16.3	51.3	50.9
TRIP Holdings [Member] | Leasing Group [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues	0.4		8.5	0.9
Operating Profit:
Total operating profit			0.1
Wholly Owned Subsidiaries [Member] | Leasing Group [Member]
Revenues:
Total revenues	123.5	93.3	317.4	275.0
Percent Change	32.40%		15.40%
Operating Profit:
Total operating profit	46.8	36.6	127.2	99.4
Interest and rent expense:
Interest expense	24.8	21.6	75.4	67.2
Wholly Owned Subsidiaries [Member] | Leasing Group [Member] | Leasing and management [Member]
Revenues:
Total revenues	94.6	86.1	277.8	256.2
Percent Change	9.90%		8.40%
Operating Profit:
Total operating profit	40.3	34.3	116.3	94.9
Wholly Owned Subsidiaries [Member] | Leasing Group [Member] | Sales of cars from the lease fleet [Member]
Revenues:
Total revenues	28.9	7.2	39.6	18.8
Operating Profit:
Total operating profit	6.5	2.3	10.9	4.5
Leasing Group [Member]
Revenues:
Total revenues	153.1	122.1	413.3	362.9
Percent Change	25.40%		13.90%
Operating Profit:
Total operating profit	64.2	52.9	178.6	150.3
Operating profit margin:
Total operating profit margin	41.90%	43.30%	43.20%	41.40%
Interest and rent expense:
Rent expense	12.1	12.2	36.4	36.5
Interest expense	43.3	33.3	116.2	102.5
Leasing Group [Member] | TRIP Holdings External [Member]
Interest and rent expense:
Interest expense	15.3	11.7	37.6	35.3
Leasing Group [Member] | TRIP Holdings Intercompany [Member]
Interest and rent expense:
Interest expense	$ 3.2		$ 3.2
Leasing Group [Member] | Leasing and management [Member]
Operating profit margin:
Total operating profit margin	46.60%	44.00%	45.90%	42.50%
Leasing Group [Member] | Sales of cars from the lease fleet [Member]
Operating profit margin:
Total operating profit margin	22.20%	31.90%	22.90%	22.80%