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Revenues - Retail Automotive Dealership (Details) - Retail Automotive Dealership - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues |  |  |  |
Total revenues | $ 5,148.5 |  | $ 15,900.0 |
U.S. |  |  |  |
Revenues |  |  |  |
Total revenues | 2,891.6 |  | 8,596.4 |
UK |  |  |  |
Revenues |  |  |  |
Total revenues | 1,945.1 |  | 6,244.9 |
Germany and Italy |  |  |  |
Revenues |  |  |  |
Total revenues | 311.8 |  | 1,058.7 |
New vehicle |  |  |  |
Revenues |  |  |  |
Total revenues | 2,350.2 |  | 7,325.6 |
Used vehicle |  |  |  |
Revenues |  |  |  |
Total revenues | 1,825.2 |  | 5,588.9 |
Finance and insurance, net |  |  |  |
Revenues |  |  |  |
Total revenues | 158.5 |  | 482.2 |
Service and parts |  |  |  |
Revenues |  |  |  |
Total revenues | 523.8 |  | 1,615.1 |
Fleet and wholesale |  |  |  |
Revenues |  |  |  |
Total revenues | $ 290.8 |  | $ 888.2 |
Without Adoption of ASC 606 |  |  |  |
Revenues |  |  |  |
Total revenues |  | $ 5,085.4 |  | $ 14,882.5
Without Adoption of ASC 606 | U.S. |  |  |  |
Revenues |  |  |  |
Total revenues |  | 2,953.1 |  | 8,625.5
Without Adoption of ASC 606 | UK |  |  |  |
Revenues |  |  |  |
Total revenues |  | 1,864.6 |  | 5,412.3
Without Adoption of ASC 606 | Germany and Italy |  |  |  |
Revenues |  |  |  |
Total revenues |  | 267.7 |  | 844.7
Without Adoption of ASC 606 | New vehicle |  |  |  |
Revenues |  |  |  |
Total revenues |  | 2,480.8 |  | 7,189.9
Without Adoption of ASC 606 | Used vehicle |  |  |  |
Revenues |  |  |  |
Total revenues |  | 1,669.5 |  | 4,850.6
Without Adoption of ASC 606 | Finance and insurance, net |  |  |  |
Revenues |  |  |  |
Total revenues |  | 152.0 |  | 436.6
Without Adoption of ASC 606 | Service and parts |  |  |  |
Revenues |  |  |  |
Total revenues |  | 520.9 |  | 1,540.1
Without Adoption of ASC 606 | Fleet and wholesale |  |  |  |
Revenues |  |  |  |
Total revenues |  | $ 262.2 |  | $ 865.3

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