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Revenues - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 2,131.2 | $ 3,005.7 | $ 4,822.0 | $ 5,814.1 | $ 5,814.1
U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,831.1 | 2,278.7 | 3,838.7 | 4,341.5 | 4,341.5
U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 263.5 | 614.4 | 854.2 | 1,256.6 | 1,256.6
Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 36.6 | 112.6 | 129.1 | 216.0 | 216.0
Total new and used vehicle sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,752.5 | 2,500.3 | 3,960.3 |  | 4,826.1
Total new and used vehicle sales | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,487.1 | 1,858.5 | 3,092.6 |  | 3,527.5
Total new and used vehicle sales | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 235.3 | 543.1 | 756.2 |  | 1,110.5
Total new and used vehicle sales | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 30.1 | 98.6 | 111.4 |  | 188.1
New vehicle retail sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 1,062.7 | 1,565.4 | 2,404.8 | 2,979.9 | 2,979.9
New vehicle retail sales | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 915.7 | 1,188.8 | 1,904.1 |  | 2,220.5
New vehicle retail sales | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 127.2 | 302.2 | 423.5 |  | 620.8
New vehicle retail sales | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 19.8 | 74.4 | 77.3 |  | 138.5
Used vehicle retail sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 641.2 | 838.9 | 1,420.3 | 1,658.1 | 1,658.1
Used vehicle retail sales | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 540.9 | 625.5 | 1,111.2 |  | 1,219.9
Used vehicle retail sales | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 92.8 | 194.0 | 281.6 |  | 397.6
Used vehicle retail sales | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 7.5 | 19.4 | 27.4 |  | 40.7
Used vehicle wholesale sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 48.7 | 96.0 | 135.2 | 188.1 | 188.1
Used vehicle wholesale sales | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 30.5 | 44.3 | 77.3 |  | 87.1
Used vehicle wholesale sales | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 15.3 | 46.9 | 51.1 |  | 92.1
Used vehicle wholesale sales | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 2.9 | 4.8 | 6.7 |  | 8.9
Parts and service sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 282.0 | 378.2 | 652.6 | 747.3 | 747.3
Parts and service sales | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 254.2 | 309.6 | 558.9 |  | 607.2
Parts and service sales | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 21.8 | 56.4 | 78.3 |  | 115.9
Parts and service sales | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 5.9 | 12.2 | 15.5 |  | 24.2
Finance, insurance and other, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 96.7 | 127.3 | 209.2 | 240.6 | 240.6
Variable consideration recognized relating to performance obligations satisfied in previous period | 5.4 | 9.0 | 9.3 | $ 12.2 |
Finance, insurance and other, net | U.S. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 89.8 | 110.5 | 187.2 |  | 206.7
Finance, insurance and other, net | U.K. |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | 6.4 | 15.0 | 19.7 |  | 30.2
Finance, insurance and other, net | Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | $ 0.6 | $ 1.8 | $ 2.3 |  | $ 3.8

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