Acquisitions and Divestitures (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combination Segment Allocation [Line Items]
Purchase price	$ 720.9	$ 125.2	$ 48.8
Rail Group
Business Combination Segment Allocation [Line Items]
Purchase price	0	23.1	0
Construction Products Group
Business Combination Segment Allocation [Line Items]
Purchase price	6.1	74.2	48.8
Energy Equipment Group
Business Combination Segment Allocation [Line Items]
Purchase price	$ 714.8	$ 27.9	$ 0