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Interim Financial Statements - Business Overview (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) item | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) item location | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Interim Financial Statements |  |  |  |  |
Total revenues | $ | $ 3,651.1 | $ 5,755.8 | $ 8,660.2 | $ 11,320.2 |
PTL |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  |  | 28.90% |  |
Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ |  |  |  |  | $ 20,600.0
Total number of owned and operated franchises | 317 |  | 317 |  |
Number of owned and operated franchises in US | 145 |  | 145 |  |
Number of owned and operated franchises outside US | 172 |  | 172 |  |
Minimum number of vehicles retailed and wholesaled |  |  | 222,000 |  |
Minimum number of vehicle brands offered |  |  | 35 |  |
Number of used vehicle supercenters operated in the U.S. and U.K. | 16 |  | 16 |  |
Number of acquired franchises |  |  | 0 |  |
Number of retail locations operated | location |  |  | 6 |  |
Retail Automotive Dealership | Minimum |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of used vehicle supercenters expected to open |  |  | 3 |  |
Retail Automotive Dealership | Maximum |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of used vehicle supercenters expected to open |  |  | 4 |  |
Retail Commercial Truck Dealership | PTG |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of operating locations | location |  |  | 25 |  |
UK | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of franchises disposed |  |  | 4 |  |
Automotive dealership revenues | Geographic | U.S. and Puerto Rico | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 60.00% |  |
Automotive dealership revenues | Geographic | Outside the U.S. | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 40.00% |  |
CarShop | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Number of retail locations operated | location |  |  | 10 |  |
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% |  |
Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ | $ 3,153.5 | 5,196.3 | $ 7,570.1 | 10,287.5 |
Retail Automotive Dealership | UK |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ | 837.8 | 1,928.2 | 2,503.2 | 3,968.1 |
Retail Automotive Dealership | U.S. |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ | 2,053.8 | 2,905.9 | $ 4,507.7 | 5,628.6 |
Retail Automotive Dealership | Automotive dealership revenues | Premium brands | Retail Automotive Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Automotive dealership revenue (as a percent) |  |  | 70.00% |  |
Retail Commercial Truck Dealership |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ | 399.2 | 426.8 | $ 890.6 | 759.1 |
Commercial Vehicle Distribution and Other |  |  |  |  |
Interim Financial Statements |  |  |  |  |
Total revenues | $ | $ 98.4 | $ 132.7 | $ 199.5 | $ 273.6 |

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