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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Reportable Segment Information | The following table provides information on revenues from external customers, intercompany revenues, and segment income of our reportable segments. Intercompany sales, which are eliminated in consolidation, may be based on current market prices, current fair values, or cost plus margin depending on the product type and the markets in which the products are sold.
| Three Months Ended |  | Three Months Ended
| March 31, 2018 |  | March 31, 2017
| Domestic |  | Import |  | Premium Luxury |  | Domestic |  | Import |  | Premium Luxury
Revenues from external customers | $ | 1,773.7 |  |  | $ | 1,652.6 |  |  | $ | 1,717.8 |  |  | $ | 1,800.8 |  |  | $ | 1,631.7 |  |  | $ | 1,616.6 |
Intercompany revenues | 140.6 |  |  | 80.9 |  |  | 102.1 |  |  | 138.8 |  |  | 92.0 |  |  | 116.0 |
Segment income (1) | 60.3 |  |  | 72.8 |  |  | 87.7 |  |  | 61.4 |  |  | 71.7 |  |  | 80.5 |
(1) Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.
Reportable Segment Income | The following is a reconciliation of total segment income for reportable segments to our consolidated income from continuing operations before income taxes.
| Three Months Ended
| March 31,
| 2018 |  | 2017
Total segment income for reportable segments | $ | 220.8 |  |  | $ | 213.6 |
Corporate and other | (63.3 | ) |  | (28.4 | )
Other interest expense | (32.3 | ) |  | (28.8 | )
Interest income | 0.2 |  |  | 0.4 |
Other income, net | 0.8 |  |  | 3.0 |
Income from continuing operations before income taxes | $ | 126.2 |  |  | $ | 159.8 |

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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