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Inventory and Vehicle Floorplan Payable (Tables) | 12 Months Ended
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Dec. 31, 2015
Inventory And Vehicle Floorplan Payable [Abstract] |
Components Of Inventory | The components of inventory at December 31 are as follows:
| 2015 |  | 2014
New vehicles | $ | 2,888.1 |  |  | $ | 2,294.3 |
Used vehicles | 539.7 |  |  | 437.6 |
Parts, accessories, and other | 184.2 |  |  | 167.1 |
Inventory | $ | 3,612.0 |  |  | $ | 2,899.0 |
Components Of Vehicle Floorplan Payable | The components of vehicle floorplan payables at December 31 are as follows:
| 2015 |  | 2014
Vehicle floorplan payable - trade | $ | 2,565.8 |  |  | $ | 2,090.7 |
Vehicle floorplan payable - non-trade | 1,161.3 |  |  | 1,006.5 |
Vehicle floorplan payable | $ | 3,727.1 |  |  | $ | 3,097.2 |

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- Definition Inventory And Vehicle Floorplan Payable [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the components of vehicle floorplan payable. + References No definition available. + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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