Railcar Leasing and Management Services Group (Details 4) (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 other than leases with the Trusts
Future contractual minimum rental obligations on leases
Remaining nine months of 2014	9.6
2015	12.8
2016	12.7
2017	12.1
2018	12.0
Thereafter	38.2
Total	97.4
Future contractual minimum rental revenues on leases
Remaining nine months of 2014	14.5
2015	13.8
2016	12.7
2017	9.5
2018	5.7
Thereafter	8.8
Total	$ 65.0