Railcar Leasing and Management Services Group (Details 4) (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
Future operating lease obligations of railcars other than those owned by the Trusts
Future contractual minimum rental obligations on leases
Remaining three months of 2012	2.4
2013	9.5
2014	9.4
2015	9.4
2016	9.3
Thereafter	38.4
Total	78.4
Future contractual minimum rental revenues of railcars other than those owned by the Trusts
Future contractual minimum rental revenues on leases
Remaining three months of 2012	2.9
2013	11.5
2014	10.9
2015	6.8
2016	5.9
Thereafter	8.2
Total	$ 46.2