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Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 2,774.7	$ 3,029.0
Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	1,912.6	2,130.1
Non-Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 862.1	$ 898.9

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- Details

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Balance Type:	na
Period Type:	duration

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- Definition

Amounts borrowed to finance the purchase of specific new vehicle inventories with the corresponding manufacturers' captive finance subsidiaries ("trade lenders") and specific new and, to a lesser extent, used vehicle inventories with non-trade lenders (lenders that are not captive finance subsidiaries of the manufacturer).

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant