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Segments - Certain Segment Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 22,831.7 | $ 13,124.3 | $ 12,672.7
Total segment income for reportable segments | 1,484.8 | 648.5 | 375.4
Depreciation, Depletion and Amortization | (127.3) | (92.4) | (82.4)
Other interest expense | (108.2) | (73.1) | (60.6)
Other (expense) income, net | (52.6) | 58.9 | 13.8
Floor plan interest expense: |  |  |
Floor plan interest expense | 22.3 | 34.4 | 72.8
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 22,780.9 | 13,103.8 | 12,642.1
Total segment income for reportable segments | 1,664.4 | 578.3 | 334.4
Floor plan interest expense: |  |  |
Floor plan interest expense | 76.7 | 84.7 | 127.9
Operating Segments | Domestic |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 6,975.3 | 4,503.0 | 4,382.4
Total segment income for reportable segments | 466.4 | 230.0 | 123.4
Floor plan interest expense: |  |  |
Floor plan interest expense | 24.7 | 30.9 | 53.6
Operating Segments | Import |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 9,690.8 | 5,448.8 | 5,267.8
Total segment income for reportable segments | 813.4 | 249.8 | 153.9
Floor plan interest expense: |  |  |
Floor plan interest expense | 30.3 | 31.6 | 44.1
Operating Segments | Luxury |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 6,114.8 | 3,152.0 | 2,991.9
Total segment income for reportable segments | 384.6 | 98.5 | 57.1
Floor plan interest expense: |  |  |
Floor plan interest expense | 21.7 | 22.2 | 30.2
Corporate and other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 50.8 | 20.5 | 30.6
Total segment income for reportable segments | 108.5 | 176.7 | 170.2
Floor plan interest expense: |  |  |
Floor plan interest expense | (54.4) | (50.3) | (55.1)
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation, Depletion and Amortization | (127.3) | (92.3) | (82.4)
Other interest expense | (108.2) | (73.1) | (60.6)
Other (expense) income, net | $ (52.6) | $ 58.9 | $ 13.8

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