Debt (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended		12 Months Ended	9 Months Ended	1 Months Ended
	Sep. 30, 2013 Recourse Corporate revolving credit facility	Sep. 30, 2013 Recourse Convertible Subordinated Notes	Dec. 31, 2012 Recourse Convertible Subordinated Notes	Sep. 30, 2013 Non-recourse TILC warehouse facility installments	Aug. 31, 2013 Non-recourse Series 2013-1 Secured Railcar Equipment Notes TRL 2012
Debt (Textual) [Abstract]
Revolving credit facility	$ 425.0			$ 475.0
Maturity date of credit facility	Oct. 20, 2016
Used revolving credit facility for letters of credit	72.6
Availability of the revolving credit facility	352.4			323.0
Borrowing under revolving credit facility exclusive of letters of credit	0
Letter of credit expiring in current year	1.5
Credit facility, description of variable rate reference rate basis	Libor
Percentage points added to Libor to compute interest rates on the credit facility	1.50%
Credit facility, description of variable rate reference rate basis, alternative computation	prime
Percentage points added to prime to compute interest rates on the credit facility, alternative computation	0.50%
Capital in excess of par value related to the convertible subordinated notes' conversion options		92.8	92.8
Date through which debt discount is being amortized		Jun. 01, 2018
Effective annual interest rate yield based upon the estimated market interest rate		8.42%
Conversion price of convertible subordinated notes (in dollars per share)		$ 50.88
Number of shares issuable in exchange of Convertible Subordinated Notes (in shares)		8,844,340
Number of shares that would have been issued if the Convertible Subordinated Notes had been converted (in shares)		0
Credit facility, amount outstanding				152.0
Interest at a defined index rate plus a margin for advances under the facility				1.94%
Maturity date				June 2015
Number of installments payable for amounts outstanding at maturity, absent renewal				3
Installment payable date, installment one				December 2015
Installment payable date, installment two				June 2016
Installment payable date, installment three				December 2016
Face value of debt instrument					$ 183.4
Interest rate on notes					3.90%
Maturity date					Jul. 15, 2043