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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 6,978.4 | $ 4,533.0 | $ 12,882.2 | $ 9,200.0
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,262.4 | 4,001.2 | 11,518.9 | 8,002.6
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 716.0 | 531.8 | 1,363.3 | 1,197.4
New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 3,428.3 | 2,261.3 | 6,410.6 | 4,543.2
Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,222.9 | 1,324.5 | 3,972.0 | 2,573.2
Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 950.8 | 689.9 | 1,801.8 | 1,566.2
Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 369.0 | 246.4 | 682.0 | 482.2
Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7.4 | 10.9 | 15.8 | 35.2
AN Reportable Segment, Domestic [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,124.8 | 1,486.0 | 3,971.5 | 2,969.5
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,944.2 | 1,343.2 | 3,625.7 | 2,654.6
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 180.6 | 142.8 | 345.8 | 314.9
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 991.3 | 761.7 | 1,926.7 | 1,500.6
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 749.1 | 436.8 | 1,312.8 | 841.4
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 257.9 | 193.3 | 492.0 | 428.9
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 125.8 | 88.0 | 235.1 | 171.1
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.7 | 6.2 | 4.9 | 27.5
AN Reportable Segment, Import [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,175.0 | 1,325.3 | 3,944.6 | 2,687.4
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,984.7 | 1,187.0 | 3,588.8 | 2,387.5
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 190.3 | 138.3 | 355.8 | 299.9
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,184.2 | 712.6 | 2,142.2 | 1,446.5
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 604.5 | 355.8 | 1,089.2 | 690.3
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 248.5 | 170.4 | 462.6 | 377.9
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 133.2 | 82.4 | 242.3 | 166.4
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4.6 | 4.1 | 8.3 | 6.3
AN Reportable Segment, Premium Luxury [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,468.5 | 1,564.8 | 4,572.0 | 3,181.6
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,204.5 | 1,373.6 | 4,068.1 | 2,753.8
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 264.0 | 191.2 | 503.9 | 427.8
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,252.8 | 787.0 | 2,341.7 | 1,596.1
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 788.8 | 490.3 | 1,431.1 | 957.6
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 317.6 | 223.2 | 602.8 | 500.6
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 108.0 | 64.3 | 194.8 | 127.3
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1.3 | 0.0 | 1.6 | 0.0
Corporate and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 210.1 | 156.9 | 394.1 | 361.5
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 129.0 | 97.4 | 236.3 | 206.7
Corporate and Other [Member] | Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 81.1 | 59.5 | 157.8 | 154.8
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 | 80.5 | 41.6 | 138.9 | 83.9
Corporate and Other [Member] | Parts and Service [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 126.8 | 103.0 | 244.4 | 258.8
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2.0 | 11.7 | 9.8 | 17.4
Corporate and Other [Member] | Product and Service, Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.8 | $ 0.6 | $ 1.0 | $ 1.4

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