Railcar Leasing and Management Services Group (Details 3) (Railcar Leasing and Management Services Group, USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Future contractual minimum rental revenues on leases
Remaining nine months of 2014	$ 318.8
2015	364.0
2016	304.0
2017	242.4
2018	177.5
Thereafter	280.5
Total	1,687.2
Operating leases with the Trusts
Future contractual minimum rental obligations on leases
Remaining nine months of 2014	33.6
2015	43.0
2016	40.1
2017	41.9
2018	45.3
Thereafter	253.6
Total	457.5
Future contractual minimum rental revenues on leases
Remaining nine months of 2014	49.6
2015	55.8
2016	45.4
2017	34.9
2018	24.4
Thereafter	43.7
Total	$ 253.8