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SEGMENT INFORMATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting [Abstract] |
Reportable segment information | Selected reportable segment data for continuing operations as follows (in millions):
| Year Ended December 31, 2023
| U.S. |  | U.K. |  | Total
Total revenues | $ | 14,814.2 |  |  | $ | 3,059.5 |  |  | $ | 17,873.7 |
Gross profit | $ | 2,610.1 |  |  | $ | 410.1 |  |  | $ | 3,020.3 |
SG&A expenses | $ | 1,622.9 |  |  | $ | 303.9 |  |  | $ | 1,926.8 |
Depreciation and amortization expense | $ | 76.9 |  |  | $ | 15.1 |  |  | $ | 92.0 |
Floorplan interest expense | $ | 53.5 |  |  | $ | 10.6 |  |  | $ | 64.1 |
Other interest expense, net | $ | 91.4 |  |  | $ | 8.4 |  |  | $ | 99.8 |
Income before income taxes | $ | 732.1 |  |  | $ | 68.1 |  |  | $ | 800.2 |
Capital expenditures: |  |  |  |  |
Real estate related capital expenditures | $ | 41.5 |  |  | $ | 4.7 |  |  | $ | 46.3 |
Non-real estate related capital expenditures | 114.6 |  |  | 24.5 |  |  | 139.2 |
Total capital expenditures | $ | 156.2 |  |  | $ | 29.3 |  |  | $ | 185.4 |
| Year Ended December 31, 2022
| U.S. |  | U.K. |  | Total
Total revenues | $ | 13,427.1 |  |  | $ | 2,795.1 |  |  | $ | 16,222.1 |
Gross profit | $ | 2,582.3 |  |  | $ | 382.9 |  |  | $ | 2,965.2 |
SG&A expenses | $ | 1,516.9 |  |  | $ | 266.5 |  |  | $ | 1,783.3 |
Depreciation and amortization expense | $ | 73.1 |  |  | $ | 15.2 |  |  | $ | 88.4 |
Floorplan interest expense | $ | 21.4 |  |  | $ | 5.9 |  |  | $ | 27.3 |
Other interest expense, net | $ | 71.0 |  |  | $ | 6.6 |  |  | $ | 77.5 |
Income before income taxes | $ | 897.4 |  |  | $ | 87.9 |  |  | $ | 985.3 |
Capital expenditures: |  |  |  |  |
Real estate related capital expenditures | $ | 17.7 |  |  | $ | 22.0 |  |  | $ | 39.6 |
Non-real estate related capital expenditures | 100.2 |  |  | 15.3 |  |  | 115.5 |
Total capital expenditures | $ | 117.8 |  |  | $ | 37.3 |  |  | $ | 155.1 |
| Year Ended December 31, 2021
| U.S. |  | U.K. |  | Total
Total revenues | $ | 10,846.3 |  |  | $ | 2,635.6 |  |  | $ | 13,481.9 |
Gross profit | $ | 2,089.5 |  |  | $ | 351.2 |  |  | $ | 2,440.7 |
SG&A expenses | $ | 1,234.9 |  |  | $ | 242.2 |  |  | $ | 1,477.2 |
Depreciation and amortization expense | $ | 60.4 |  |  | $ | 17.0 |  |  | $ | 77.4 |
Floorplan interest expense | $ | 22.2 |  |  | $ | 5.4 |  |  | $ | 27.6 |
Other interest expense, net | $ | 48.5 |  |  | $ | 7.3 |  |  | $ | 55.8 |
Income before income taxes | $ | 721.8 |  |  | $ | 79.2 |  |  | $ | 800.9 |
Capital expenditures: |  |  |  |  |
Real estate related capital expenditures | $ | 18.9 |  |  | $ | 27.0 |  |  | $ | 45.9 |
Non-real estate related capital expenditures | 82.3 |  |  | 13.9 |  |  | 96.2 |
Total capital expenditures | $ | 101.2 |  |  | $ | 40.9 |  |  | $ | 142.1 |
Goodwill and intangible franchise rights and total assets by reportable segment |
|  | December 31, 2023
|  | U.S. |  | U.K. |  | Total
Property and equipment, net |  | $ | 1,915.2 |  |  | $ | 333.5 |  |  | $ | 2,248.7 |
Total assets |  | $ | 6,665.7 |  |  | $ | 1,086.6 |  |  | $ | 7,752.3 |
|  | December 31, 2022
|  | U.S. |  | U.K. |  | Total
Property and equipment, net |  | $ | 1,824.1 |  |  | $ | 304.1 |  |  | $ | 2,128.2 |
Total assets |  | $ | 5,710.8 |  |  | $ | 983.8 |  |  | $ | 6,694.7 |

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- Definition Schedule of Segment Reporting, by Segment, Goodwill and Intangible Assets [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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