Fair Value Accounting (Details 1) - USD ($) $ in Millions	Sep. 30, 2015		Dec. 31, 2014
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	$ 886.6		$ 889.3
Less: unamortized discount	(48.3)	[1]	(60.0)
Total recourse debt	838.3	[1]	829.3
Non-recourse debt	2,446.2		2,723.7
Total debt	3,284.5	[1]	3,553.0
Carrying Value
Carrying amounts and estimated fair values of long-term debt
Total recourse debt	838.3		829.3
Non-recourse debt	2,446.2		2,723.7
Total debt	3,284.5		3,553.0
Carrying Value | Senior notes
Carrying amounts and estimated fair values of long-term debt
Long-term debt	399.6		399.6
Carrying Value | Convertible subordinated notes
Carrying amounts and estimated fair values of long-term debt
Long-term debt	401.6		389.9
Convertible subordinated notes	449.5		449.5
Less: unamortized discount	(47.9)		(59.6)
Carrying Value | Capital lease obligations
Carrying amounts and estimated fair values of long-term debt
Capital lease obligations	36.6		39.1
Carrying Value | Other
Carrying amounts and estimated fair values of long-term debt
Long-term debt	0.5		0.7
Carrying Value | Non-recourse debt | 2006 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	209.0		223.0
Carrying Value | Non-recourse debt | 2009 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	181.4		188.8
Carrying Value | Non-recourse debt | 2010 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	300.0		311.5
Carrying Value | Non-recourse debt | TRL 2012 secured railcar equipment notes (RIV 2013)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	454.5		472.2
Carrying Value | Non-recourse debt | TRIP Master Funding secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	1,009.6		1,043.7
Carrying Value | Promissory notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	0.0		363.9
Carrying Value | Line of credit | Revolving credit facility | TILC warehouse facility
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	291.7		120.6
Estimated Fair Value
Carrying amounts and estimated fair values of long-term debt
Total recourse debt	947.1		1,020.7
Non-recourse debt	2,566.6		2,892.3
Total debt	3,513.7		3,913.0
Estimated Fair Value | Senior notes
Carrying amounts and estimated fair values of long-term debt
Long-term debt	380.4		387.0
Estimated Fair Value | Convertible subordinated notes
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	529.6		593.9
Estimated Fair Value | Capital lease obligations
Carrying amounts and estimated fair values of long-term debt
Capital lease obligations	36.6		39.1
Estimated Fair Value | Other
Carrying amounts and estimated fair values of long-term debt
Long-term debt	0.5		0.7
Estimated Fair Value | Non-recourse debt | 2006 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	225.6		245.6
Estimated Fair Value | Non-recourse debt | 2009 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	213.1		227.7
Estimated Fair Value | Non-recourse debt | 2010 secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	323.0		344.0
Estimated Fair Value | Non-recourse debt | TRL 2012 secured railcar equipment notes (RIV 2013)
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	448.2		470.3
Estimated Fair Value | Non-recourse debt | TRIP Master Funding secured railcar equipment notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	1,065.0		1,121.4
Estimated Fair Value | Promissory notes
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	0.0		362.7
Estimated Fair Value | Line of credit | Revolving credit facility | TILC warehouse facility
Carrying amounts and estimated fair values of long-term debt
Non-recourse debt	$ 291.7		$ 120.6

[1] (unaudited)