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Intangible Assets - Information by Segment (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Intangible assets |  |
Goodwill | $ 1,760.7 | $ 1,752.0
Retail Automotive Dealership |  |
Intangible assets |  |
Goodwill | 1,519.8 |
Retail Commercial Truck Dealership |  |
Intangible assets |  |
Goodwill | 162.9 |
Other |  |
Intangible assets |  |
Goodwill | 78.0 |
Non-Automotive Investments |  |
Intangible assets |  |
Goodwill | $ 0.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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