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Intangible Assets - Information by Segment (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
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Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill | $ 1,325.6 | $ 1,322.8
Retail Automotive |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill | 1,094.2 |
Retail Commercial Truck Dealership |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill | 147.5 |
Other |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill | $ 83.9 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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- Details
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