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Revenues - Retail Automotive Dealership (Details) - Retail Automotive Dealership - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues |  |  |  |
Total revenues | $ 5,455.5 |  | $ 10,751.5 |
U.S. |  |  |  |
Revenues |  |  |  |
Total revenues | 2,953.9 |  | 5,704.8 |
UK |  |  |  |
Revenues |  |  |  |
Total revenues | 2,107.0 |  | 4,299.8 |
Germany and Italy |  |  |  |
Revenues |  |  |  |
Total revenues | 394.6 |  | 746.9 |
New vehicle |  |  |  |
Revenues |  |  |  |
Total revenues | 2,528.6 |  | 4,975.4 |
Used vehicle |  |  |  |
Revenues |  |  |  |
Total revenues | 1,896.9 |  | 3,763.7 |
Finance and insurance, net |  |  |  |
Revenues |  |  |  |
Total revenues | 162.9 |  | 323.7 |
Service and parts |  |  |  |
Revenues |  |  |  |
Total revenues | 547.8 |  | 1,091.3 |
Fleet and wholesale |  |  |  |
Revenues |  |  |  |
Total revenues | $ 319.3 |  | $ 597.4 |
Without Adoption of ASC 606 |  |  |  |
Revenues |  |  |  |
Total revenues |  | $ 5,040.7 |  | $ 9,797.1
Without Adoption of ASC 606 | U.S. |  |  |  |
Revenues |  |  |  |
Total revenues |  | 3,016.4 |  | 5,672.5
Without Adoption of ASC 606 | UK |  |  |  |
Revenues |  |  |  |
Total revenues |  | 1,721.3 |  | 3,547.7
Without Adoption of ASC 606 | Germany and Italy |  |  |  |
Revenues |  |  |  |
Total revenues |  | 303.0 |  | 576.9
Without Adoption of ASC 606 | New vehicle |  |  |  |
Revenues |  |  |  |
Total revenues |  | 2,401.7 |  | 4,709.1
Without Adoption of ASC 606 | Used vehicle |  |  |  |
Revenues |  |  |  |
Total revenues |  | 1,640.1 |  | 3,181.1
Without Adoption of ASC 606 | Finance and insurance, net |  |  |  |
Revenues |  |  |  |
Total revenues |  | 147.2 |  | 284.6
Without Adoption of ASC 606 | Service and parts |  |  |  |
Revenues |  |  |  |
Total revenues |  | 520.3 |  | 1,019.2
Without Adoption of ASC 606 | Fleet and wholesale |  |  |  |
Revenues |  |  |  |
Total revenues |  | $ 331.4 |  | $ 603.1

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