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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Goodwill by Segment    
Goodwill $ 244.5 [1] $ 240.4 [2]
Rail Group
   
Goodwill by Segment    
Goodwill 122.5 122.5 [2]
Construction Products Group
   
Goodwill by Segment    
Goodwill 109.3 105.2 [2]
Energy Equipment Group
   
Goodwill by Segment    
Goodwill 10.9 10.9 [2]
Railcar Leasing and Management Services Group
   
Goodwill by Segment    
Goodwill $ 1.8 $ 1.8 [2]
[1] (unaudited)
[2] (as reported)