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Revenue - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 3,118.3 | $ 2,889.1 | $ 8,932.4 | $ 8,692.5
U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,422.8 | 2,200.2 | 6,764.3 | 6,456.5
U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 584.6 | 585.9 | 1,841.2 | 1,913.5
Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 110.9 | 103.0 | 326.9 | 322.5
Total new and used vehicle sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,607.2 | 2,418.5 | 7,433.4 | 7,286.9
Total new and used vehicle sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,995.2 | 1,809.3 | 5,522.7 | 5,298.7
Total new and used vehicle sales | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 515.0 | 519.8 | 1,625.5 | 1,706.2
Total new and used vehicle sales | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 97.0 | 89.4 | 285.2 | 282.0
New vehicle retail sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,652.2 | 1,539.5 | 4,632.2 | 4,608.7
New vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,291.7 | 1,196.6 | 3,512.1 | 3,433.4
New vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 290.7 | 278.0 | 911.6 | 971.1
New vehicle retail sales | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 69.8 | 64.9 | 208.5 | 204.2
Used vehicle retail sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 869.7 | 792.4 | 2,527.8 | 2,394.8
Used vehicle retail sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 657.6 | 572.0 | 1,877.6 | 1,727.8
Used vehicle retail sales | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 189.3 | 200.1 | 586.8 | 600.7
Used vehicle retail sales | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22.8 | 20.3 | 63.4 | 66.3
Used vehicle wholesale sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 85.3 | 86.6 | 273.4 | 283.4
Used vehicle wholesale sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45.9 | 40.7 | 133.0 | 137.5
Used vehicle wholesale sales | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35.0 | 41.7 | 127.1 | 134.4
Used vehicle wholesale sales | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4.4 | 4.2 | 13.3 | 11.5
Parts and service sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 383.5 | 354.5 | 1,130.8 | 1,062.1
Parts and service sales | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 314.9 | 289.3 | 922.2 | 862.6
Parts and service sales | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 56.6 | 53.8 | 172.5 | 165.0
Parts and service sales | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 12.0 | 11.4 | 36.1 | 34.5
Finance, insurance and other, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 127.6 | 116.1 | 368.2 | 343.5
Variable consideration recognized relating to performance obligations satisfied in previous period | 2.6 | 6.8 | 14.8 | 12.5
Finance, insurance and other, net | U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 112.7 | 101.6 | 319.4 | 295.2
Finance, insurance and other, net | U.K. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 13.0 | 12.3 | 43.2 | 42.3
Finance, insurance and other, net | Brazil |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 1.9 | $ 2.2 | $ 5.6 | $ 6.0

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