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Intangible Assets - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill, Beginning balance | $ 1,660.5 | $ 1,291.2
Goodwill, Additions | 144.1 | 324.8
Goodwill, Disposals | (13.8) | (4.5)
Goodwill, Foreign currency translation | (38.8) | 49.0
Goodwill, Ending balance | 1,752.0 | 1,660.5
Retail Automotive Dealership |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill, Beginning balance | 1,412.1 | 1,050.2
Goodwill, Additions | 143.2 | 324.8
Goodwill, Disposals | (13.8) | (4.5)
Goodwill, Foreign currency translation | (29.6) | 41.6
Goodwill, Ending balance | 1,511.9 | 1,412.1
Retail Commercial Truck Dealership |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill, Beginning balance | 163.0 | 162.0
Goodwill, Additions | 0.9 |
Goodwill, Foreign currency translation | (1.3) | 1.0
Goodwill, Ending balance | 162.6 | 163.0
Other |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill, Beginning balance | 85.4 | 79.0
Goodwill, Foreign currency translation | (7.9) | 6.4
Goodwill, Ending balance | 77.5 | 85.4
Non-Automotive Investments |  |
Summary of the changes in the carrying amount of goodwill by reportable segment |  |
Goodwill, Beginning balance | 0.0 |
Goodwill, Ending balance | $ 0.0 | $ 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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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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