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Acquisitions (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 store
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 | $ 237.8 |  |
Amount of earnings for stores acquired in the second half of 2021 included in our Consolidated Statement of Operations | $ 8.2 |  |
Pro forma revenue |  | $ 6,097.1 |
Pro forma net income from continuing operations |  | $ 245.4 |
Dealerships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | store |  |  | 20
Collision Centers [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired | store |  |  | 4

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