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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue |  |
Total revenues | $ 4,130.0 | $ 3,844.4
U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 3,342.4 | 3,091.3
U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 787.7 | 753.0
Total new and used vehicle sales |  |
Disaggregation of Revenue |  |
Total revenues | 3,416.6 | 3,198.5
Total new and used vehicle sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 2,721.0 | 2,528.2
Total new and used vehicle sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 695.6 | 670.3
New vehicle retail sales |  |
Disaggregation of Revenue |  |
Total revenues | 1,955.7 | 1,745.1
New vehicle retail sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 1,608.6 | 1,433.1
New vehicle retail sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 347.1 | 312.0
Used vehicle retail sales |  |
Disaggregation of Revenue |  |
Total revenues | 1,348.9 | 1,359.9
Used vehicle retail sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 1,030.1 | 1,037.9
Used vehicle retail sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 318.8 | 322.0
Used vehicle wholesale sales |  |
Disaggregation of Revenue |  |
Total revenues | 112.0 | 93.5
Used vehicle wholesale sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 82.4 | 57.2
Used vehicle wholesale sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 29.6 | 36.3
Parts and service sales |  |
Disaggregation of Revenue |  |
Total revenues | 548.3 | 472.9
Parts and service sales | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 473.8 | 408.4
Parts and service sales | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | 74.6 | 64.5
Finance, insurance and other, net |  |
Disaggregation of Revenue |  |
Total revenues | 165.1 | 173.0
Variable consideration recognized relating to performance obligations satisfied in previous period | 4.9 | 10.1
Finance, insurance and other, net | U.S. |  |
Disaggregation of Revenue |  |
Total revenues | 147.6 | 154.7
Finance, insurance and other, net | U.K. |  |
Disaggregation of Revenue |  |
Total revenues | $ 17.5 | $ 18.3

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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