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Inventory And Vehicle Floorplan Payable (Components Of Inventory) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Inventory [Line Items] |  |
Inventory | $ 2,691.4 | $ 2,827.2
New Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 2,139.6 | 2,330.8
Used Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 394.7 | 346.5
Parts, Accessories, And Other [Member] |  |
Inventory [Line Items] |  |
Inventory | $ 157.1 | $ 149.9

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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