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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue |  |  |  |
Total revenues | $ 4,163.4 | $ 3,412.8 | $ 12,153.1 | $ 9,992.3
U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 3,484.3 | 2,662.4 | 10,012.8 | 7,991.6
U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 679.1 | 750.4 | 2,140.3 | 2,000.7
Total new and used vehicle sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 3,461.5 | 2,850.3 | 10,112.5 | 8,408.9
Total new and used vehicle sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 2,860.3 | 2,178.8 | 8,207.0 | 6,620.2
Total new and used vehicle sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 601.2 | 671.5 | 1,905.5 | 1,788.7
New vehicle retail sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,883.3 | 1,513.9 | 5,479.8 | 4,828.6
New vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,586.9 | 1,208.5 | 4,581.8 | 3,958.9
New vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 296.4 | 305.4 | 898.0 | 869.7
Used vehicle retail sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,488.6 | 1,230.4 | 4,353.9 | 3,302.3
Used vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 1,212.1 | 902.3 | 3,447.6 | 2,481.7
Used vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 276.5 | 328.0 | 906.3 | 820.5
Used vehicle wholesale sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 89.6 | 106.0 | 278.9 | 278.0
Used vehicle wholesale sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 61.3 | 68.0 | 177.6 | 179.6
Used vehicle wholesale sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 28.3 | 38.1 | 101.2 | 98.4
Parts and service sales |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 515.6 | 416.5 | 1,491.1 | 1,152.2
Parts and service sales | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 453.8 | 353.1 | 1,307.7 | 982.0
Parts and service sales | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 61.8 | 63.4 | 183.4 | 170.2
Finance, insurance and other, net |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 186.3 | 146.0 | 549.5 | 431.3
Variable consideration recognized relating to performance obligations satisfied in previous period | 5.3 | 5.1 | 22.2 | 18.7
Finance, insurance and other, net | U.S. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | 170.2 | 130.5 | 498.1 | 389.4
Finance, insurance and other, net | U.K. |  |  |  |
Disaggregation of Revenue |  |  |  |
Total revenues | $ 16.1 | $ 15.6 | $ 51.4 | $ 41.9

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