Fair Value Accounting (Details 1) - USD ($) $ in Millions	Sep. 30, 2016		Dec. 31, 2015
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	$ 882.9		$ 885.7
Less: unamortized discount	(31.5)	[1]	(44.2)
Less: unamortized debt issuance costs	(4.0)		(4.8)
Recourse, net of unamortized discount of $31.5 and $44.2	847.4	[1]	836.7
Non-recourse debt	2,287.4		2,390.7
Less: unamortized debt issuance costs	(27.7)		(32.0)
Non-recourse debt, net of unamortized debt issuance costs	2,259.7		2,358.7
Total	3,107.1	[1]	3,195.4
Carrying Value
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	851.4		841.5
Less: unamortized debt issuance costs	(4.0)		(4.8)
Recourse, net of unamortized discount of $31.5 and $44.2	847.4		836.7
Non-recourse debt	2,287.4		2,390.7
Less: unamortized debt issuance costs	(27.7)		(32.0)
Non-recourse debt, net of unamortized debt issuance costs	2,259.7		2,358.7
Total	3,107.1		3,195.4
Carrying Value | 2006 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	198.0		204.1
Carrying Value | 2009 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	174.1		179.2
Carrying Value | 2010 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	284.1		296.2
Carrying Value | TRL 2012 secured railcar equipment notes (RIV 2013)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	431.1		449.1
Carrying Value | TRIP Master Funding secured railcar equipment notes (TRIP Holdings)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	963.3		997.8
Carrying Value | Senior notes
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	399.6		399.6
Carrying Value | Convertible subordinated notes
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	418.3		405.6
Convertible subordinated notes	449.4		449.4
Less: unamortized discount	(31.1)		(43.8)
Carrying Value | Capital lease obligations
Carrying amounts and estimated fair values of long-term debt
Capital lease obligations, gross of unamortized debt issuances costs of $0.1 and $0.1	33.2		35.8
Carrying Value | Other
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	0.3		0.5
Carrying Value | Line of credit | TILC warehouse facility | Revolving credit facility
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	236.8		264.3
Estimated Fair Value
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	970.5		941.4
Non-recourse debt	2,331.4		2,480.3
Total	3,301.9		3,421.7
Estimated Fair Value | 2006 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	207.8		218.2
Estimated Fair Value | 2009 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	196.4		207.2
Estimated Fair Value | 2010 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	295.1		314.2
Estimated Fair Value | TRL 2012 secured railcar equipment notes (RIV 2013)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	411.3		436.9
Estimated Fair Value | TRIP Master Funding secured railcar equipment notes (TRIP Holdings)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	984.0		1,039.5
Estimated Fair Value | Senior notes
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	398.4		370.3
Estimated Fair Value | Convertible subordinated notes
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	538.6		534.8
Estimated Fair Value | Capital lease obligations
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	33.2		35.8
Estimated Fair Value | Other
Carrying amounts and estimated fair values of long-term debt
Corporate - Recourse	0.3		0.5
Estimated Fair Value | Line of credit | TILC warehouse facility | Revolving credit facility
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	$ 236.8		$ 264.3

[1] (unaudited)