Railcar Leasing and Management Services Group (Details 3) (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 with the Trusts
Future contractual minimum rental obligations on leases
Remaining six months of 2013	22.6
2014	44.7
2015	43.0
2016	40.1
2017	41.9
Thereafter	298.9
Total	491.2
Future contractual minimum rental revenues on leases
Remaining six months of 2013	31.7
2014	52.3
2015	41.9
2016	31.9
2017	22.6
Thereafter	43.3
Total	$ 223.7