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Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Vehicle floorplan payable$ 1,511.3$ 1,866.4
Trade [Member]
  
Vehicle floorplan payable1,043.21,379.9
Non-Trade [Member]
  
Vehicle floorplan payable$ 468.1$ 486.5