Railcar Leasing and Management Services Group (Details 4) (Leasing Group, USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Future contractual minimum rental revenues on leases
Remaining three months of 2013	$ 115.0
2014	395.6
2015	333.3
2016	271.2
2017	206.9
Thereafter	393.6
Total	1,715.6
Operating leases other than leases with the Trusts
Future contractual minimum rental obligations on leases
Remaining three months of 2013	3.2
2014	12.8
2015	12.8
2016	12.7
2017	12.1
Thereafter	50.3
Total	103.9
Future contractual minimum rental revenues on leases
Remaining three months of 2013	4.7
2014	18.0
2015	12.4
2016	11.5
2017	8.9
Thereafter	14.5
Total	$ 70.0