Railcar Leasing and Management Services Group (Details 3) (Leasing Group, USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Future contractual minimum rental revenues on leases
Remaining three months of 2012	$ 98.3
2013	346.5
2014	274.8
2015	219.3
2016	171.8
Thereafter	338.9
Total	1,449.6
Future operating lease obligations of Trusts' railcars
Future contractual minimum rental obligations on leases
Remaining three months of 2012	11.4
2013	45.6
2014	44.8
2015	43.1
2016	40.1
Thereafter	341.3
Total	526.3
Future contractual minimum rental revenues of Trusts' railcars
Future contractual minimum rental revenues on leases
Remaining three months of 2012	15.7
2013	51.1
2014	36.4
2015	28.2
2016	19.9
Thereafter	37.0
Total	$ 188.3