Railcar Leasing and Management Services Group (Details 3) (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 with the Trusts
Future contractual minimum rental obligations on leases
Remaining three months of 2013	11.3
2014	44.7
2015	43.0
2016	40.1
2017	41.9
Thereafter	298.9
Total	479.9
Future contractual minimum rental revenues on leases
Remaining three months of 2013	15.9
2014	53.4
2015	42.7
2016	32.6
2017	23.2
Thereafter	37.6
Total	$ 205.4