Debt (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 4.5		$ 4.8
3 7/8% Convertible Subordinated Notes Due 2036 [Member] | Convertible subordinated notes
Debt Instrument [Line Items]
Coupon rate interest	4.4	$ 4.4
Amortized debt discount	4.2	3.8
Total interest expense recognized on the Convertible Subordinated Notes	8.6	$ 8.2
Railcar Leasing and Management Services Group | Capital lease obligations, net of unamortized debt issuances costs of $0.1 and $0.1
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 0.1		$ 0.1