Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventories Net
New vehicles	$ 1,725.7	$ 1,410.5
Used vehicles	588.5	479.7
Commercial vehicles	126.9
Parts, accessories and other	97.2	85.5
Total inventories	$ 2,538.3	$ 1,975.7