Debt (Details 1) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ 4.0		$ 4.0		$ 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	13.1	$ 13.1
Amortized debt discount	4.3	4.0	12.7	11.7
Total interest expense recognized on the Convertible Subordinated Notes	8.7	$ 8.4	25.8	$ 24.8
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		$ 0.1