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Revenues - Retail Automotive Dealership (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 5,439.3 | $ 5,658.6 | $ 5,940.3 | $ 5,746.9 | $ 5,398.0 | $ 5,524.4 | $ 5,383.4 | $ 5,081.1 | $ 22,785.1 | $ 21,386.9 | $ 20,118.5
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 12,607.8 | 12,487.2 | 12,005.9
Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 20,849.2 | 19,824.3 | 18,673.2
Retail Automotive Dealership | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 11,504.3 |  |
Retail Automotive Dealership | UK |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 7,961.4 |  |
Retail Automotive Dealership | Germany and Italy |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,383.5 |  |
New vehicle | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 9,666.4 |  |
Used vehicle | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 7,252.1 |  |
Finance and insurance, net | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 629.6 |  |
Service and parts | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,151.4 |  |
Fleet and wholesale | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 1,149.7 |  |
Without Adoption of ASC 606 | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 19,824.3 | 18,673.2
Without Adoption of ASC 606 | Retail Automotive Dealership | U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 11,610.1 | 11,109.6
Without Adoption of ASC 606 | Retail Automotive Dealership | UK |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 7,048.7 | 6,520.1
Without Adoption of ASC 606 | Retail Automotive Dealership | Germany and Italy |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 1,165.5 | 1,043.5
Without Adoption of ASC 606 | New vehicle | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 9,678.5 | 9,547.1
Without Adoption of ASC 606 | Used vehicle | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 6,386.8 | 5,663.7
Without Adoption of ASC 606 | Finance and insurance, net | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 581.8 | 495.0
Without Adoption of ASC 606 | Service and parts | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 2,057.5 | 1,948.6
Without Adoption of ASC 606 | Fleet and wholesale | Retail Automotive Dealership |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 1,119.7 | $ 1,018.8

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