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Intangible Assets - Information by Segment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Intangible assets
Goodwill	$ 2,050.9	$ 1,928.4
Retail automotive dealership
Intangible assets
Goodwill	1,602.2
Retail commercial truck dealership
Intangible assets
Goodwill	369.4
Other
Intangible assets
Goodwill	79.3
Non-Automotive Investments
Intangible assets
Goodwill	$ 0.0

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+ References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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