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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disaggregation of Revenue |  |
Total revenues | $ 5,505.3 | $ 4,470.5
U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 3,921.8 | 3,645.7
U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 1,583.5 | 824.8
Total new and used vehicle sales |  |
Disaggregation of Revenue |  |
Total revenues | 4,587.0 | 3,705.4
Total new and used vehicle sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 3,205.0 | 2,979.2
Total new and used vehicle sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 1,381.9 | 726.2
New vehicle retail sales |  |
Disaggregation of Revenue |  |
Total revenues | 2,680.0 | 2,182.6
New vehicle retail sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 1,968.7 | 1,799.8
New vehicle retail sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 711.2 | 382.8
Used vehicle retail sales |  |
Disaggregation of Revenue |  |
Total revenues | 1,755.4 | 1,416.8
Used vehicle retail sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 1,144.3 | 1,099.5
Used vehicle retail sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 611.1 | 317.3
Used vehicle wholesale sales |  |
Disaggregation of Revenue |  |
Total revenues | 151.6 | 106.0
Used vehicle wholesale sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 92.0 | 79.9
Used vehicle wholesale sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 59.6 | 26.2
Parts and service sales |  |
Disaggregation of Revenue |  |
Total revenues | 692.1 | 576.2
Parts and service sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 531.3 | 495.1
Parts and service sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 160.8 | 81.1
Finance, insurance and other, net |  |
Disaggregation of Revenue |  |
Total revenues | 226.2 | 188.9
Variable consideration recognized | 10.4 | 12.4
Finance, insurance and other, net | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 185.5 | 171.4
Finance, insurance and other, net | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | $ 40.8 | $ 17.5

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