Acquisitions and Divestitures (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Purchase price	$ 46.2	$ 720.9	$ 125.2
Rail Group
Business Acquisition [Line Items]
Purchase price	0.0	0.0	23.1
Construction Products Group
Business Acquisition [Line Items]
Purchase price	46.2	6.1	74.2
Energy Equipment Group
Business Acquisition [Line Items]
Purchase price	$ 0.0	$ 714.8	$ 27.9