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Interim Financial Statements - Business Overview (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 29, 2021 item | Mar. 31, 2021 USD ($) location item | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Interim Financial Statements |  |  |  |
Total revenues | $ |  | $ 5,773.8 | $ 5,009.1 |
PTL |  |  |  |
Interim Financial Statements |  |  |  |
Ownership interest in Penske Truck Leasing Co (as a percent) |  | 28.90% |  |
Retail Automotive Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Total number of owned and operated franchises |  | 304 |  |
Number of owned and operated franchises in US |  | 143 |  |
Number of owned and operated franchises outside US |  | 161 |  |
Minimum number of vehicles retailed and wholesaled |  | 135,000 |  |
Minimum number of vehicle brands offered |  | 35 |  |
Number of used vehicle supercenters operated in the U.S. and U.K. |  | 17 |  |
Number uf used vehicle supercenters operated in the U.K. |  | 11 |  |
Retail Commercial Truck Dealership | KCFL |  |  |  |
Interim Financial Statements |  |  |  |
Number of full service dealerships added | 4 |  |  |
Number of parts and service centers added | 4 |  |  |
Number of collision centers added | 2 |  |  |
UK | Retail Automotive Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Number of franchises disposed |  | 1 |  |
Revenues | Geographic | U.S. and Puerto Rico |  |  |  |
Interim Financial Statements |  |  |  |
Automotive dealership revenue (as a percent) |  | 58.00% |  |
Revenues | Geographic | Outside the U.S. |  |  |  |
Interim Financial Statements |  |  |  |
Automotive dealership revenue (as a percent) |  | 42.00% |  |
CarSense | Retail Automotive Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Number of retail locations operated | location |  | 6 |  |
CarShop | Retail Automotive Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Number of retail locations operated | location |  | 11 |  |
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 | Retail Commercial Truck Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Number of operating locations | location |  | 25 |  |
Retail Automotive Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Total revenues | $ |  | $ 5,206.9 | 4,416.6 | $ 17,900.0
Retail Automotive Dealership | UK |  |  |  |
Interim Financial Statements |  |  |  |
Total revenues | $ |  | 1,853.4 | 1,665.4 |
Retail Automotive Dealership | U.S. |  |  |  |
Interim Financial Statements |  |  |  |
Total revenues | $ |  | $ 3,004.8 | 2,453.9 |
Number of franchises awarded to the reporting entity |  | 1 |  |
Retail Automotive Dealership | Revenues | Premium brands |  |  |  |
Interim Financial Statements |  |  |  |
Automotive dealership revenue (as a percent) |  | 73.00% |  |
Retail Commercial Truck Dealership |  |  |  |
Interim Financial Statements |  |  |  |
Total revenues | $ |  | $ 434.7 | 491.4 |
Commercial Vehicle Distribution and Other |  |  |  |
Interim Financial Statements |  |  |  |
Total revenues | $ |  | $ 132.2 | $ 101.1 |

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