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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Goodwill by Segment    
Goodwill $ 229.8 [1] $ 225.9
Rail Group
   
Goodwill by Segment    
Goodwill 122.5 122.5
Construction Products Group
   
Goodwill by Segment    
Goodwill 94.6 90.7
Energy Equipment Group
   
Goodwill by Segment    
Goodwill 10.9 10.9
Railcar Leasing and Management Services Group
   
Goodwill by Segment    
Goodwill $ 1.8 $ 1.8
[1] (unaudited)