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Inventory And Vehicle Floorplan Payable (Components Of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory [Line Items]    
Inventory $ 2,776.6 $ 2,827.2
New Vehicle [Member]
   
Inventory [Line Items]    
Inventory 2,202.5 2,330.8
Used Vehicle [Member]
   
Inventory [Line Items]    
Inventory 420.3 346.5
Parts, Accessories, And Other [Member]
   
Inventory [Line Items]    
Inventory $ 153.8 $ 149.9