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Intangible Assets - Information by Segment (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 2,162.5	$ 2,154.7
Retail automotive dealership
Goodwill [Line Items]
Goodwill	1,626.5
Retail commercial truck dealership
Goodwill [Line Items]
Goodwill	462.4
Other
Goodwill [Line Items]
Goodwill	73.6
Non-Automotive Investments
Goodwill [Line Items]
Goodwill	$ 0.0

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.

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