Railcar Leasing and Management Services Group (Details 2) (USD $) In Millions	Jun. 30, 2011
Future contractual minimum rental revenues on leases
Remaining six months of 2011	$ 178.2
2012	301.3
2013	223.8
2014	156.9
2015	120.2
Thereafter	268.4
Total	1,248.8
TRIP Holdings [Member]
Future contractual minimum rental revenues on leases
Remaining six months of 2011	51.9
2012	86.3
2013	55.5
2014	35.6
2015	29.7
Thereafter	70.8
Total	329.8
Wholly Owned Subsidiaries [Member]
Future contractual minimum rental revenues on leases
Remaining six months of 2011	126.3
2012	215.0
2013	168.3
2014	121.3
2015	90.5
Thereafter	197.6
Total	$ 919.0