Railcar Leasing and Management Services Group (Details 2) (Leasing Group, USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Future contractual minimum rental revenues on leases
Remaining three months of 2012	$ 98.3
2013	346.5
2014	274.8
2015	219.3
2016	171.8
Thereafter	338.9
Total	1,449.6
Wholly-owned subsidiaries
Future contractual minimum rental revenues on leases
Remaining three months of 2012	73.5
2013	261.0
2014	210.7
2015	167.0
2016	128.6
Thereafter	268.8
Total	1,109.6
TRIP Holdings
Future contractual minimum rental revenues on leases
Remaining three months of 2012	24.8
2013	85.5
2014	64.1
2015	52.3
2016	43.2
Thereafter	70.1
Total	$ 340.0