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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventories    
New vehicles $ 1,627.1 $ 1,709.4
Used vehicles 629.9 585.5
Commercial vehicles 120.3 126.9
Parts, accessories and other 101.7 96.5
Total inventories $ 2,479.0 $ 2,518.3