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Revenues - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 2,690.8 | $ 2,808.4
U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,007.6 | 2,062.8
U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 590.7 | 642.2
Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 92.5 | 103.4
Total new and used vehicle sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,207.7 | 2,325.8
Total new and used vehicle sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,605.5 | 1,669.0
Total new and used vehicle sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 520.9 | 567.4
Total new and used vehicle sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 81.3 | 89.4
New vehicle retail sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,342.2 | 1,414.5
New vehicle retail sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 988.4 | 1,031.7
New vehicle retail sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 296.3 | 318.6
New vehicle retail sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 57.5 | 64.2
Used vehicle retail sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 779.0 | 819.2
Used vehicle retail sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 570.3 | 594.4
Used vehicle retail sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 188.8 | 203.6
Used vehicle retail sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 19.9 | 21.2
Used vehicle wholesale sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 86.5 | 92.1
Used vehicle wholesale sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 46.8 | 42.8
Used vehicle wholesale sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 35.8 | 45.3
Used vehicle wholesale sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3.8 | 4.1
Parts and service sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 370.6 | 369.2
Parts and service sales | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 304.6 | 297.6
Parts and service sales | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 56.4 | 59.6
Parts and service sales | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 9.6 | 12.0
Finance, insurance and other, net |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 112.5 | 113.4
Variable consideration recognized relating to performance obligations satisfied in previous period | 4.0 | 3.2
Finance, insurance and other, net | U.S. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 97.4 | 96.2
Finance, insurance and other, net | U.K. |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 13.3 | 15.2
Finance, insurance and other, net | Brazil |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 1.7 | $ 2.0

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