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Interim Financial Statements - Business Overview (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2019 location | Sep. 30, 2019 USD ($) item | Mar. 31, 2019 | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) item | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | $ 5,967.6 |  | $ 5,658.6 | $ 17,287.8 | $ 17,345.8 |
Minimum number of vehicle brands offered |  |  |  |  | 35 |  |
Number of used vehicle supercenters operated in the U.S. and U.K. |  | 15 |  |  | 15 |  |
PTL |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  | 28.90% |  |
German Automotive Dealership Group |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership acquired (as a percent) |  |  | 8.40% |  |  |  |
Ownership interest (as a percent) |  |  | 87.80% |  |  |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total number of owned and operated franchises |  | 333 |  |  | 333 |  |
Number of owned and operated franchises in US |  | 149 |  |  | 149 |  |
Number of owned and operated franchises outside US |  | 184 |  |  | 184 |  |
Minimum number of vehicles retailed and wholesaled |  |  |  |  | 478,000 |  |
Number of franchises awarded to the reporting entity |  |  |  |  | 1 |  |
Number of franchises disposed |  |  |  |  | 13 |  |
Commercial Vehicle Distribution |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Minimum number of dealership locations |  |  |  |  | 70 |  |
Number of retail dealerships owned by the reporting entity |  |  |  |  | 10 |  |
UK | Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of franchises disposed |  |  |  |  | 1 |  |
U.S. | Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of franchises disposed |  |  |  |  | 6 |  |
Germany | Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of franchises disposed |  |  |  |  | 6 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  | 56.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  | 44.00% |  |
Automotive dealership revenues | Premium brands |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  |  |  | 70.00% |  |
CarSense | Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of retail locations operated |  |  |  |  | 6 |  |
CarShop | Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of retail locations operated |  |  |  |  | 9 |  |
Penske Corporation | PTL |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  | 41.10% |  |
Mitsui and Co | PTL |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  |  |  | 30.00% |  |
PTG |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of locations acquired | location | 6 |  |  |  |  |  |
PTG | Retail Commercial Truck Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Number of operating locations |  |  |  |  | 25 |  |
Retail Automotive Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | $ 5,155.4 |  | 5,148.5 | $ 15,442.9 | 15,900.0 | $ 20,800.0
Retail Automotive Dealership | UK |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | 1,859.6 |  | 1,945.1 | 5,827.7 | 6,244.9 |
Retail Automotive Dealership | U.S. |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | 2,995.5 |  | 2,891.6 | 8,624.1 | 8,596.4 |
Retail Commercial Truck Dealership |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | 692.3 |  | 385.3 | 1,451.4 | 1,016.5 |
Commercial Vehicle Distribution and Other |  |  |  |  |  |  |
Interim Financial Statements |  |  |  |  |  |  |
Total revenues | $ |  | $ 119.9 |  | $ 124.8 | $ 393.5 | $ 429.3 |

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