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Intangible Assets - Changes in Goodwill by Reportable Segment (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | $ 1,928,400,000 | $ 1,911,000,000
Additions | 209,600,000 | 0
Disposals | (600,000) | (8,800,000)
Foreign currency translation | (13,300,000) | 26,200,000
Goodwill, Ending balance | 2,124,100,000 | 1,928,400,000
Retail automotive dealership |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 1,534,800,000 | 1,524,800,000
Additions | 96,800,000 | 0
Disposals | (600,000) | (8,800,000)
Foreign currency translation | (8,800,000) | 18,800,000
Goodwill, Ending balance | 1,622,200,000 | 1,534,800,000
Retail commercial truck dealership |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 309,400,000 | 309,000,000.0
Additions | 112,800,000 | 0
Disposals | 0 | 0
Foreign currency translation | 100,000 | 400,000
Goodwill, Ending balance | 422,300,000 | 309,400,000
Other |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 84,200,000 | 77,200,000
Additions | 0 | 0
Disposals | 0 | 0
Foreign currency translation | (4,600,000) | 7,000,000.0
Goodwill, Ending balance | 79,600,000 | 84,200,000
Non-Automotive Investments |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning balance | 0 |
Goodwill, Ending balance | $ 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=120320667&loc=SL49117168-202975 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 4: 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=121556970&loc=d3e13816-109267 + Details
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