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Acquisitions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 store | Jun. 30, 2021 USD ($)
Series of Individually Immaterial Business Acquisitions |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |
Amount of revenue for stores acquired in the second half of 2021 included in our Consolidated Statement of Operations | $ 261.7 |  | $ 499.5 |  |
Amount of earnings for stores acquired in the second half of 2021 included in our Consolidated Statement of Operations | $ 12.6 |  | $ 20.8 |  |
Pro forma revenue |  | $ 7,209.1 |  |  | $ 13,306.2
Pro forma net income from continuing operations |  | $ 396.5 |  |  | $ 641.9
Dealerships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Businesses Acquired | store |  |  |  | 20 |
Collision Centers |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of Businesses Acquired | store |  |  |  | 4 |

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