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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 5,903.8 | $ 4,667.0
Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,256.6 | 4,001.5
Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 647.2 | 665.5
New Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,982.3 | 2,281.9
Used Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,749.1 | 1,248.7
Parts and Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 851.0 | 876.3
Finance and Insurance, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 313.0 | 235.8
Product and Service, Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 8.4 | 24.3
AN Reportable Segment, Domestic [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,846.7 | 1,483.5
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,681.6 | 1,311.4
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 165.1 | 172.1
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 935.4 | 738.9
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 563.7 | 404.6
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 234.1 | 235.6
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 109.3 | 83.1
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4.2 | 21.3
AN Reportable Segment, Import [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,769.6 | 1,362.1
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,604.1 | 1,200.5
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 165.5 | 161.6
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 958.0 | 733.9
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 484.7 | 334.5
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 214.1 | 207.5
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 109.1 | 84.0
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3.7 | 2.2
AN Reportable Segment, Premium Luxury [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,103.5 | 1,616.8
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,863.6 | 1,380.2
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 239.9 | 236.6
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,088.9 | 809.1
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 642.3 | 467.3
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 285.2 | 277.4
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 86.8 | 63.0
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.3 | 0.0
Corporate and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 184.0 | 204.6
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 107.3 | 109.4
Corporate and Other [Member] | Transferred over Time [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 76.7 | 95.2
Corporate and Other [Member] | New Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0.0 | 0.0
Corporate and Other [Member] | Used Vehicle [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 58.4 | 42.3
Corporate and Other [Member] | Parts and Service [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 117.6 | 155.8
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7.8 | 5.7
Corporate and Other [Member] | Product and Service, Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0.2 | $ 0.8

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