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Revenues - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 10,851.8 | $ 12,043.8 | $ 11,601.4
Variable consideration recognized | 27.6 | 19.5 | 18.7
U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,503.4 | 9,184.2 | 8,723.3
U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,096.8 | 2,413.7 | 2,437.4
Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 251.6 | 445.9 | 440.7
Total new and used vehicle sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,994.6 | 10,035.9 | 9,717.0
Total new and used vehicle sales | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6,924.5 | 7,516.6 | 7,168.7
Total new and used vehicle sales | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,855.3 | 2,128.7 | 2,162.6
Total new and used vehicle sales | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 214.7 | 390.6 | 385.7
New vehicle retail sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,580.8 | 6,314.1 | 6,181.4
New vehicle retail sales | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,406.6 | 4,832.2 | 4,682.8
New vehicle retail sales | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,021.8 | 1,195.1 | 1,217.1
New vehicle retail sales | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 152.4 | 286.8 | 281.4
Used vehicle retail sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,105.7 | 3,366.6 | 3,166.1
Used vehicle retail sales | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,348.5 | 2,509.9 | 2,307.0
Used vehicle retail sales | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 707.2 | 771.3 | 771.7
Used vehicle retail sales | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 50.0 | 85.4 | 87.4
Used vehicle wholesale sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 308.1 | 355.2 | 369.6
Used vehicle wholesale sales | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169.4 | 174.5 | 178.9
Used vehicle wholesale sales | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 126.4 | 162.3 | 173.8
Used vehicle wholesale sales | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 12.3 | 18.3 | 16.9
Parts and service sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,389.3 | 1,510.0 | 1,416.9
Parts and service sales | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,162.6 | 1,234.4 | 1,153.3
Parts and service sales | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 194.8 | 227.9 | 217.6
Parts and service sales | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 31.9 | 47.6 | 46.0
Finance, insurance and other, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 467.9 | 497.9 | 467.5
Finance, insurance and other, net | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 416.3 | 433.2 | 401.3
Finance, insurance and other, net | U.K. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 46.6 | 57.0 | 57.2
Finance, insurance and other, net | Brazil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 5.0 | $ 7.6 | $ 9.0

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