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Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 segments | Sep. 30, 2013 segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  | 3 |  | 3 |
Total consolidated revenue | $ 4,909.0 |  | $ 4,470.8 |  | $ 14,061.0 |  | $ 12,993.7 |
Total segment income | 237.8 | [1] | 211.1 | [1] | 684.1 | [1] | 624.2 | [1]
Corporate and other | (43.5) |  | (36.6) |  | (129.4) |  | (125.9) |
Other interest expense | (21.7) |  | (22.3) |  | (64.6) |  | (66.6) |
Interest income | 0.1 |  | 0.1 |  | 0.2 |  | 0.2 |
Other income (loss), net | 1.1 |  | (0.7) |  | 3.5 |  | 2.2 |
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES | 173.8 |  | 151.6 |  | 493.8 |  | 434.1 |
AN Reportable Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Total consolidated revenue | 4,871.4 |  | 4,434.1 |  | 13,954.8 |  | 12,875.7 |
AN Reportable Segment, Domestic [Member] |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Total consolidated revenue | 1,660.7 |  | 1,491.2 |  | 4,738.6 |  | 4,384.5 |
Total segment income | 76.7 | [1] | 64.2 | [1] | 211.0 | [1] | 188.9 | [1]
AN Reportable Segment, Import [Member] |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Total consolidated revenue | 1,787.8 |  | 1,695.5 |  | 5,055.0 |  | 4,828.5 |
Total segment income | 77.1 | [1] | 72.7 | [1] | 220.0 | [1] | 216.6 | [1]
AN Reportable Segment, Premium Luxury [Member] |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Total consolidated revenue | 1,422.9 |  | 1,247.4 |  | 4,161.2 |  | 3,662.7 |
Total segment income | 84.0 | [1] | 74.2 | [1] | 253.1 | [1] | 218.7 | [1]
Corporate and Other [Member] |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Total consolidated revenue | $ 37.6 |  | $ 36.7 |  | $ 106.2 |  | $ 118.0 |
[1] | Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

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- Definition Operating income related to other businesses, including collision centers, customer lead distribution business, and an auction operation, each of which generates revenues. Amount also includes unallocated corporate overhead expenses, floorplan interest expense on used floorplan facilities, and retrospective commissions. + References No definition available. + Details
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- Definition Represents operating income less floorplan interest expense for each of the reportable segments. + References No definition available. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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