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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 6,379.5 | $ 5,404.9 | $ 19,261.7 | $ 14,604.9
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,679.3 | 4,751.5 | 17,198.2 | 12,754.1
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 700.2 | 653.4 | 2,063.5 | 1,850.8
New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,753.8 | 2,748.4 | 9,164.4 | 7,291.6
Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,323.2 | 1,516.9 | 6,295.2 | 4,090.1
Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 943.7 | 852.8 | 2,745.5 | 2,419.0
Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 348.9 | 281.2 | 1,030.9 | 763.4
Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9.9 | 5.6 | 25.7 | 40.8
AN Reportable Segment, Domestic [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,955.2 | 1,734.5 | 5,926.7 | 4,704.0
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,778.6 | 1,563.4 | 5,404.3 | 4,218.0
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 176.6 | 171.1 | 522.4 | 486.0
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 791.3 | 923.4 | 2,718.0 | 2,424.0
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 789.0 | 478.0 | 2,101.8 | 1,319.4
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 257.2 | 233.2 | 749.2 | 662.1
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 116.7 | 97.8 | 351.8 | 268.9
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1.0 | 2.1 | 5.9 | 29.6
AN Reportable Segment, Import [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,983.3 | 1,621.5 | 5,927.9 | 4,308.9
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,800.4 | 1,443.2 | 5,389.2 | 3,830.7
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 182.9 | 178.3 | 538.7 | 478.2
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 967.9 | 887.7 | 3,110.1 | 2,334.2
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 638.0 | 415.0 | 1,727.2 | 1,105.3
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 243.5 | 220.4 | 706.1 | 598.3
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 127.1 | 95.2 | 369.4 | 261.6
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6.8 | 3.2 | 15.1 | 9.5
AN Reportable Segment, Premium Luxury [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,218.0 | 1,870.0 | 6,790.0 | 5,051.6
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,960.6 | 1,633.6 | 6,028.7 | 4,387.4
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 257.4 | 236.4 | 761.3 | 664.2
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 994.6 | 937.3 | 3,336.3 | 2,533.4
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 810.9 | 576.7 | 2,242.0 | 1,534.3
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 312.4 | 278.4 | 915.2 | 779.0
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 98.7 | 77.5 | 293.5 | 204.8
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1.4 | 0.1 | 3.0 | 0.1
Corporate and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 223.0 | 178.9 | 617.1 | 540.4
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 139.7 | 111.3 | 376.0 | 318.0
Corporate and Other [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 83.3 | 67.6 | 241.1 | 222.4
Corporate and Other [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Corporate and Other [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 85.3 | 47.2 | 224.2 | 131.1
Corporate and Other [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 130.6 | 120.8 | 375.0 | 379.6
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6.4 | 10.7 | 16.2 | 28.1
Corporate and Other [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.7 | $ 0.2 | $ 1.7 | $ 1.6

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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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