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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue |  |  |  |
Total revenues | $ 4,696.4 | $ 4,558.5 | $ 9,166.9 | $ 8,688.5
U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 3,921.2 | 3,799.6 | 7,566.9 | 7,142.0
U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 775.2 | 758.9 | 1,600.0 | 1,546.5
Total new and used vehicle sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 3,921.7 | 3,806.2 | 7,627.1 | 7,222.8
Total new and used vehicle sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 3,239.9 | 3,135.2 | 6,219.1 | 5,856.2
Total new and used vehicle sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 681.8 | 671.0 | 1,408.0 | 1,366.6
New vehicle retail sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 2,364.2 | 2,243.2 | 4,546.8 | 4,198.9
New vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 2,009.5 | 1,915.5 | 3,809.4 | 3,524.1
New vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 354.6 | 327.6 | 737.4 | 674.8
Used vehicle retail sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,453.2 | 1,450.6 | 2,870.0 | 2,799.5
Used vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,151.9 | 1,139.9 | 2,251.4 | 2,170.0
Used vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 301.3 | 310.7 | 618.6 | 629.5
Used vehicle wholesale sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 104.3 | 112.5 | 210.3 | 224.4
Used vehicle wholesale sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 78.4 | 79.8 | 158.3 | 162.1
Used vehicle wholesale sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 25.9 | 32.7 | 52.0 | 62.3
Parts and service sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 574.5 | 562.0 | 1,150.8 | 1,110.3
Parts and service sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 497.4 | 491.2 | 992.6 | 965.0
Parts and service sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 77.1 | 70.8 | 158.2 | 145.3
Finance, insurance and other, net |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 200.1 | 190.3 | 389.0 | 355.4
Variable consideration recognized relating to performance obligations satisfied in previous period | 5.6 | 7.6 | 18.0 | 12.5
Finance, insurance and other, net | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 183.9 | 173.2 | 355.2 | 320.8
Finance, insurance and other, net | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | $ 16.3 | $ 17.1 | $ 33.8 | $ 34.6

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