Debt (Details 2) $ in Millions	Sep. 30, 2015 USD ($)
Remaining principal payments under existing debt agreements
Remaining three months of 2015	$ 31.3
2016	118.8
2017	109.8
2018	145.0
2019	379.0
Thereafter	2,548.9
Corporate
Remaining principal payments under existing debt agreements
Remaining three months of 2015	0.0
2016	0.2
2017	0.3
2018	0.0
2019	0.0
Thereafter	849.5
Capital lease obligations | Leasing Group
Remaining principal payments under existing debt agreements
Remaining three months of 2015	0.8
2016	3.5
2017	3.7
2018	28.6
2019	0.0
Thereafter	0.0
Non-recourse debt | Leasing Group | 2006 secured railcar equipment notes
Remaining principal payments under existing debt agreements
Remaining three months of 2015	4.9
2016	21.8
2017	23.9
2018	25.3
2019	28.0
Thereafter	105.1
Non-recourse debt | Leasing Group | 2009 secured railcar equipment notes
Remaining principal payments under existing debt agreements
Remaining three months of 2015	2.2
2016	6.5
2017	6.3
2018	6.4
2019	11.2
Thereafter	148.8
Non-recourse debt | Leasing Group | 2010 secured railcar equipment notes
Remaining principal payments under existing debt agreements
Remaining three months of 2015	3.8
2016	14.9
2017	13.7
2018	10.0
2019	7.6
Thereafter	250.0
Non-recourse debt | Leasing Group | TRL 2012 secured railcar equipment notes (RIV 2013)
Remaining principal payments under existing debt agreements
Remaining three months of 2015	5.4
2016	22.3
2017	22.9
2018	23.1
2019	22.2
Thereafter	358.6
Non-recourse debt | Leasing Group | TRIP Master Funding secured railcar equipment notes
Remaining principal payments under existing debt agreements
Remaining three months of 2015	11.8
2016	39.8
2017	29.2
2018	41.8
2019	50.1
Thereafter	836.9
Revolving credit facility | Line of credit | Leasing Group | TILC warehouse facility
Remaining principal payments under existing debt agreements
Remaining three months of 2015	2.4
2016	9.8
2017	9.8
2018	9.8
2019	2.4
Thereafter	0.0
Revolving credit facility | Line of credit | Leasing Group | Facility termination payments - TILC warehouse facility
Remaining principal payments under existing debt agreements
Remaining three months of 2015	0.0
2016	0.0
2017	0.0
2018	0.0
2019	257.5
Thereafter	$ 0.0