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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets, Net | Goodwill and intangible assets, net, at December 31 consisted of the following:
| 2017 |  | 2016
Goodwill | $ | 1,515.0 |  |  | $ | 1,511.3 |
Franchise rights - indefinite-lived | $ | 572.2 |  |  | $ | 589.4 |
Other intangible assets | 23.3 |  |  | 16.3 |
| 595.5 |  |  | 605.7 |
Less: accumulated amortization | (8.7 | ) |  | (7.5 | )
Intangible assets, net | $ | 586.8 |  |  | $ | 598.2 |
Goodwill Allocated to Reporting Units and Changes in Carrying Amounts | Goodwill allocated to our reporting units and changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 were as follows:
| Domestic |  | Import |  | Premium Luxury |  | Other |  | Consolidated
Goodwill at January 1, 2016 (1) | $ | 203.1 |  |  | $ | 570.9 |  |  | $ | 620.5 |  |  | $ | — |  |  | $ | 1,394.5 |
Acquisitions, dispositions, and other adjustments, net | 49.0 |  |  | (12.7 | ) |  | 76.9 |  |  | 3.6 |  |  | 116.8 |
Goodwill at December 31, 2016 (1) | 252.1 |  |  | 558.2 |  |  | 697.4 |  |  | 3.6 |  |  | 1,511.3 |
Acquisitions, dispositions, and other adjustments, net (2) | (20.4 | ) |  | (25.8 | ) |  | 14.7 |  |  | 35.2 |  |  | 3.7 |
Goodwill at December 31, 2017 (1) | $ | 231.7 |  |  | $ | 532.4 |  |  | $ | 712.1 |  |  | $ | 38.8 |  |  | $ | 1,515.0 |
(1) | Net of accumulated impairment losses of $1.47 billion associated with our single reporting unit (prior to September 30, 2008, our reporting unit structure was comprised of a single reporting unit) and $140.0 million associated with our Domestic reporting unit, both of which were recorded during the year ended December 31, 2008.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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