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Intangible Assets - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Summary of the changes in the carrying amount of goodwill by reportable segment
Goodwill, Beginning balance	$ 1,911.0	$ 1,752.0
Goodwill, Additions		146.6
Goodwill, Disposals	(8.8)	(3.9)
Goodwill, Foreign currency translation	26.2	16.3
Goodwill, Ending balance	1,928.4	1,911.0
Retail Automotive Dealership
Summary of the changes in the carrying amount of goodwill by reportable segment
Goodwill, Beginning balance	1,524.8	1,511.9
Goodwill, Additions		0.9
Goodwill, Disposals	(8.8)	(3.9)
Goodwill, Foreign currency translation	18.8	15.9
Goodwill, Ending balance	1,534.8	1,524.8
Retail Commercial Truck Dealership
Summary of the changes in the carrying amount of goodwill by reportable segment
Goodwill, Beginning balance	309.0	162.6
Goodwill, Additions		145.6
Goodwill, Foreign currency translation	0.4	0.8
Goodwill, Ending balance	309.4	309.0
Other
Summary of the changes in the carrying amount of goodwill by reportable segment
Goodwill, Beginning balance	77.2	77.5
Goodwill, Additions		0.1
Goodwill, Foreign currency translation	7.0	(0.4)
Goodwill, Ending balance	84.2	77.2
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

X

- 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

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