Fair Value Accounting (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Carrying amounts and estimated fair values of long-term debt
Less: unamortized discount	$ (67.0)	[1]	$ (74.1)
Notes payable	1,260.7	[1]	1,314.7
Total debt	3,242.5	[1]	2,989.8
Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Total debt	1,301.3		1,356.9
Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Total debt	1,557.3		1,256.1
Recourse
Carrying amounts and estimated fair values of long-term debt
Less: unamortized discount	(67.0)		(74.1)
Total debt	424.5		419.0
Recourse | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Less: unamortized discount	0		0
Total debt	40.6		42.2
Recourse | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Less: unamortized discount	0		0
Total debt	0		0
Carrying Value
Carrying amounts and estimated fair values of long-term debt
Total debt	3,242.5		2,989.8
Carrying Value | Recourse
Carrying amounts and estimated fair values of long-term debt
Total debt	424.5		419.0
Carrying Value | Recourse | Corporate
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	450.0		450.0
Less: unamortized discount	(67.0)		(74.1)
Convertible subordinated notes, net	383.0		375.9
Other	0.9		0.9
Total debt	383.9		376.8
Carrying Value | Recourse | Capital lease obligations | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Capital lease obligations	40.6		42.2
Carrying Value | Non-recourse | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Total debt	2,818.0		2,570.8
Carrying Value | Non-recourse | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Total debt	1,260.7		1,314.7
Carrying Value | Non-recourse | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	1,557.3		1,256.1
Carrying Value | Non-recourse | 2006 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	232.5		240.7
Carrying Value | Non-recourse | Promissory notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	382.0		396.1
Carrying Value | Non-recourse | 2009 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	194.1		199.0
Carrying Value | Non-recourse | 2010 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	320.1		326.9
Carrying Value | Non-recourse | TILC warehouse facility | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Loans payable	132.0		152.0
Carrying Value | Non-recourse | TRL 2012 secured railcar equipment notes - RIV 2013 | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	486.6		499.3
Carrying Value | Non-recourse | TRIP Master Funding secured railcar equipment notes | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	1,070.7		756.8
Estimated Fair Value
Carrying amounts and estimated fair values of long-term debt
Total debt	3,867.6		3,312.7
Estimated Fair Value | Recourse
Carrying amounts and estimated fair values of long-term debt
Total debt	879.4		636.5
Estimated Fair Value | Recourse | Corporate
Carrying amounts and estimated fair values of long-term debt
Convertible subordinated notes	837.9		593.4
Other	0.9		0.9
Estimated Fair Value | Recourse | Capital lease obligations | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Capital lease obligations	40.6		42.2
Estimated Fair Value | Non-recourse | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Total debt	2,988.2		2,676.2
Estimated Fair Value | Non-recourse | 2006 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	256.4		259.2
Estimated Fair Value | Non-recourse | Promissory notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	376.9		389.6
Estimated Fair Value | Non-recourse | 2009 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	233.5		229.5
Estimated Fair Value | Non-recourse | 2010 secured railcar equipment notes | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	351.8		342.7
Estimated Fair Value | Non-recourse | TILC warehouse facility | Wholly-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Loans payable	132.0		152.0
Estimated Fair Value | Non-recourse | TRL 2012 secured railcar equipment notes - RIV 2013 | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	485.1		483.4
Estimated Fair Value | Non-recourse | TRIP Master Funding secured railcar equipment notes | Partially-owned subsidiaries | Railcar Leasing and Management Services Group
Carrying amounts and estimated fair values of long-term debt
Notes payable	$ 1,152.5		$ 819.8

[1] (unaudited)