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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 25,844.0 | $ 20,390.0 | $ 21,335.7
Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 23,072.9 | 17,900.4 | 18,604.7
Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,771.1 | 2,489.6 | 2,731.0
New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12,081.7 | 10,418.6 | 11,166.5
Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,638.8 | 5,601.3 | 5,466.5
Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,706.6 | 3,257.4 | 3,572.1
Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,384.5 | 1,059.3 | 1,023.3
Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 32.4 | 53.4 | 107.3
AN Reportable Segment, Domestic [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,959.9 | 6,490.6 | 6,671.4
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,260.7 | 5,841.6 | 5,969.6
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 699.2 | 649.0 | 701.8
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,601.8 | 3,411.1 | 3,502.5
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,875.0 | 1,781.4 | 1,769.5
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,007.6 | 891.5 | 959.0
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 469.1 | 370.5 | 354.6
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6.4 | 36.1 | 85.8
AN Reportable Segment, Import [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,798.5 | 5,988.0 | 6,468.7
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,079.0 | 5,343.8 | 5,768.3
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 719.5 | 644.2 | 700.4
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,969.8 | 3,283.7 | 3,695.6
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,370.5 | 1,516.5 | 1,501.9
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 950.0 | 811.3 | 889.7
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 489.6 | 361.7 | 368.3
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 18.6 | 14.8 | 13.2
AN Reportable Segment, Premium Luxury [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 9,229.9 | 7,202.8 | 7,434.8
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,197.6 | 6,301.3 | 6,467.5
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,032.3 | 901.5 | 967.3
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,510.1 | 3,723.8 | 3,968.4
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,067.4 | 2,125.9 | 2,045.6
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,246.7 | 1,058.1 | 1,136.0
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 401.0 | 294.7 | 279.2
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4.7 | 0.3 | 5.6
Corporate and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 855.7 | 708.6 | 760.8
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 535.6 | 413.7 | 399.3
Corporate and Other [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 320.1 | 294.9 | 361.5
Corporate and Other [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Corporate and Other [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 325.9 | 177.5 | 149.5
Corporate and Other [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 502.3 | 496.5 | 587.4
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 24.8 | 32.4 | 21.2
Corporate and Other [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 2.7 | $ 2.2 | $ 2.7

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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