Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill by Segment
Goodwill	$ 753,800,000	$ 773,200,000
Goodwill impairment charges	0	0
Rail Group
Goodwill by Segment
Goodwill	134,600,000	134,600,000
Accumulated goodwill impairment losses	325,000,000	325,000,000
Construction Products Group
Goodwill by Segment
Goodwill	111,000,000	128,300,000
Energy Equipment Group
Goodwill by Segment
Goodwill	506,400,000	508,500,000
Railcar Leasing and Management Services Group
Goodwill by Segment
Goodwill	$ 1,800,000	$ 1,800,000