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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, 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

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