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Acquisitions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) store | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) store
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | $ 1,235.3 | $ 1,185.0 | $ 1,501.9
Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Inventory | 46.6 |  |
Property and equipment | 282.8 |  |
Goodwill | 51.6 |  |
Franchise rights - indefinite-lived | 232.4 |  |
Other assets | 17.7 |  |
Vehicle floorplan payable - non-trade | (15.1) |  |
Other liabilities | (2.8) |  |
Aggregate purchase price | 613.2 |  |
Finance lease obligations | (180.5) |  |
Cash used in business acquisition, net of cash acquired | 432.7 |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |
Amount of revenue included in our Consolidated Statement of Income | 176.9 |  |
Amount of earnings included in our Consolidated Statement of Income | 6.9 |  |
Pro-forma revenue | 26,544.2 | 21,074.8 |
Pro-forma net income from continuing operations | 1,407.0 | 404.1 |
Reporting Unit, Domestic [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 228.7 | 227.2 | 227.3
Reporting Unit, Domestic [Member] | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 1.5 |  |
Reporting Unit, Import [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 517.9 | 500.6 | 498.9
Reporting Unit, Import [Member] | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 15.3 |  |
Reporting Unit, Premium Luxury [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 484.1 | 457.2 | 714.9
Reporting Unit, Premium Luxury [Member] | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 30.3 |  |
Reporting Unit, Collision Centers [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | 4.6 | $ 0.0 | $ 41.7
Reporting Unit, Collision Centers [Member] | Series of Individually Immaterial Business Acquisitions |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | $ 4.6 |  |
Dealerships [Member] |  |  |
Acquisitions [Line Items] |  |  |
Number of stores purchased | store | 20 |  |
Collision Center [Member] |  |  |
Acquisitions [Line Items] |  |  |
Number of stores purchased | store | 4 |  |
Parts Distribution Centers [Member] |  |  |
Acquisitions [Line Items] |  |  |
Number of stores purchased | store |  |  | 2

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