Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Depreciation, Depletion and Amortization, Nonproduction	$ 13.6	$ 11.2	$ 39.0	$ 31.6
Depreciation expense on railcar assets leased to others	4.6	3.6	12.9	10.5
Amortization expense on intangible assets	$ 2.6	$ 1.1	$ 5.5	$ 2.2