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Goodwill (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Goodwill by Segment  
Total Goodwill$ 225.9[1]$ 197.6
Rail Group [Member]
  
Goodwill by Segment  
Total Goodwill122.5122.5
Construction Products Group [Member]
  
Goodwill by Segment  
Total Goodwill90.762.4
Energy Equipment Group [Member]
  
Goodwill by Segment  
Total Goodwill10.910.9
Railcar Leasing and Management Services Group [Member]
  
Goodwill by Segment  
Total Goodwill$ 1.8$ 1.8
[1]Unaudited