Railcar Leasing and Management Services Group (Details 4) (Leasing Group, USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Future contractual minimum rental revenues on leases
Remaining six months of 2013	$ 217.0
2014	364.4
2015	304.3
2016	244.5
2017	183.3
Thereafter	345.0
Total	1,658.5
Operating leases other than leases with the Trusts
Future contractual minimum rental obligations on leases
Remaining six months of 2013	6.5
2014	12.8
2015	12.8
2016	12.7
2017	12.1
Thereafter	50.3
Total	107.2
Future contractual minimum rental revenues on leases
Remaining six months of 2013	8.3
2014	16.0
2015	12.4
2016	11.4
2017	8.9
Thereafter	14.5
Total	$ 71.5